Photocatalytic and eco-emission applications of green synthesized ZnO-CB nanoparticles
subject: Calyxes of brinjal; Dye degradation; Green emissions; Millettia pinnata oil methyl ester; Photocatalysis; ZnO-CB
description: Herein, we report the synthesis of ZnO nanoparticles (ZnO-CB NPs) by employing the solution combustion method using an aqueous extract of brinjal calyxes as fuel. Characterization techniques, such as X-ray diffraction (XRD), Fourier transform Infrared spectroscopy (FTIR), UVvisible spectroscopy, and Scanning electron microscopy (SEM), were used to investigate the structural, optical, and morphological properties of synthesized nanoparticles, respectively. Highly porous hexagonal crystalline ZnO-CB NPs with less than 7 nm particle size were obtained. The photocatalytic performance of synthesized material is measured with Malachite green (MG), Basic brown 1 (BB1), and Acid orange 36 (AO36) as benchmark dyes. It showed that the synthesized material worked effectively under pH 10 with UV light irradiation. The synthesized ZnO-CB NP shows good removal effectiveness of the MG, BB1, and AO36 dyes with 99.3 %, 99.6 %, and 99.5 %, respectively, which can be promising photocatalysts for ecological applications such as wastewater remediation. Further, the synthesized ZnO-CB NP was used as blends in the methyl ester of Millettia pinnata oil (MPME), which is blended 20 % with commercial diesel (MPME20). The synthesized ZnO-CB NP was added to the MPME20 in varying amounts to ascertain its effects on the quality of emissions of various greenhouse gases such as hydrocarbons, COx, and NOx. Moreover, brake thermal efficiency (BTHE) and brake-specific fuel consumption (BSFC) were studied for the blends. The blend MPME20 with 25 mg of ZnO-CB NP, i.e., MPME20-25 mg, ZnO-CB, displays the best performance and reduced emissions. 2024 The Author(s)
creator: Shubha J.P.; Roopashree B.; Sushma N.V.; Kiran K.; Ravikumar R.; Kuniyil M.; Rafi Shaik M.; Khan M.; Farooq Adil S.
source: Journal of King Saud University - Science, Vol-36, No. 9
publisher: Elsevier B.V.
date: 2024-01-01
rights: All Open Access; Hybrid Gold Open Access
relation: ISSN: 10183647
format: Online
language: English
type: Article
coverage: Shubha J.P., Department of Chemistry, Sri Jayachamarajendra College of Engineering, JSS Science & Technology University, Mysuru, 570006, India; Roopashree B., Department of Chemistry, JSS Academy of Technical Education, Dr. Vishnuvardhan Road, Bengaluru, 560060, India; Sushma N.V., Department of Chemistry, Don Bosco Institute of Technology, Mysore Road, Bangalore, 560074, India; Kiran K., Department of Mechanical and Automobile Engineering, School of Engineering and Technology, CHRIST University, Bengaluru, 560074, India; Ravikumar R., Department of Mechanical and Automobile Engineering, School of Engineering and Technology, CHRIST University, Bengaluru, 560074, India; Kuniyil M., Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia; Rafi Shaik M., Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia; Khan M., Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia; Farooq Adil S., Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia

Photocatalytic degradation of methylene blue and metanil yellow dyes using green synthesized zinc oxide (Zno) nanocrystals
subject: Coconut husk extract; Photocatalysis; UV light; ZnO
description: In this work, ZnO nanocrystals (NCs) have been effectively synthesized by a simple, efficient and cost-effective method using coconut husk extract as a novel fuel. The synthesized NCs are characterized by UV-Vis, XRD, FT-IR, SEM, EDX, Raman and PL studies. The obtained ZnO were found to be UV-active with a bandgap of 2.93 eV. The X-ray diffraction pattern confirms the crystallinity of the ZnO with hexagonally structured ZnO with a crystallite size of 48 nm, while the SEM analysis reveals the hexagonal bipyramid morphology. Photocatalytic activities of the synthesized ZnO NCs are used to degrade methylene blue and metanil yellow dyes. 2021 by the authors. Licensee MDPI, Basel, Switzerland.
creator: Priyadharshini S.S.; Shubha J.P.; Shivalingappa J.; Adil S.F.; Kuniyil M.; Hatshan M.R.; Shaik B.; Kavalli K.
source: Crystals, Vol-12, No. 1
publisher: MDPI
date: 2022-01-01
rights: All Open Access; Gold Open Access
relation: ISSN: 20734352
format: Online
language: English
type: Article
coverage: Priyadharshini S.S., Department of Chemistry, SJB Institute of Technology, Kengeri, Bangalore, 560060, India; Shubha J.P., Department of Chemistry, Don Bosco Institute of Technology, Mysore Road, Bangalore, 560074, India; Shivalingappa J., Department of Chemistry, SJB Institute of Technology, Kengeri, Bangalore, 560060, India; Adil S.F., Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia; Kuniyil M., Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia; Hatshan M.R., Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia; Shaik B., Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Gyeonggi-do, Yongin-si, 446-701, South Korea; Kavalli K., Department of Mechanical and Automobile Engineering, School of Engineering and Technology, CHRIST University, Bangalore, 560074, India

Photocatalytic Degradation of Textile Dyes Using Artemisia stelleriana Besser Mediated Nanoparticles
subject: Life Sciences
description: Artemisia stelleriana is widely used as an ornamental plant and belongs to the family Asteraceae. In the current study, A. stelleriana-mediated Zinc oxide newlinenanoparticles (AS-ZnONPs), Silver nanoparticles (AS-AgNPs) and Silver/Zinc oxide bimetallic nanoparticles (AS-Ag/ZnONPs) were synthesised using one-pot method. The UV-Vis spectral analysis revealed characteristic peaks at 358 nm for AS-ZnONPs, newline425 nm for AS-AgNPs, and 357 nm and 473 nm for AS-Ag/ZnONPs. Fourier transform infrared spectroscopy (FTIR) analysis identified phytoconstituents taking part in newlinenanoparticle synthesis, manifesting the presence of alkaloids, phenols, saponins, and newlineflavonoids. The synthesised AS-ZnONPs, AS-AgNPs, and AS-Ag/ZnONPs have a crystalline nature and were confirmed using X-ray diffraction (XRD) analysis. The crystallite sizes of the AS-ZnONPs, AS-AgNPs, and AS-Ag/ZnONPs were 22.54 nm, 18.67 nm, and 10.4 nm, respectively. Spherical-shaped Ag nanoparticles and hexagonal, cylindrical, and spherical-shaped ZnO nanoparticles were synthesized from the leaf extract of A. stelleriana. The average size of the synthesised nanoparticles was 37.6 nm and 71.2 nm for AS-ZnONPs and AS-AgNPs, respectively. On the other hand, spherical-shaped AS-Ag/ZnONPs were synthesized with an average size of 35.3 nm. The photocatalytic degradation activity of AS-ZnONPs showed 93.44%, 47%, 94.76%, 99.9%, and 74.82% degradation for Reactive Blue 220 (RB220), Reactive Blue 222A (RB222A), Reactive Red 120 (RR120), Reactive Yellow 145 (RY145) and newlineReactive Yellow 86 (RY86) dyes respectively after 320 min of UV light exposure. ASZnONPs showed positive results for all five dyes and a better percentage of degradation was observed in a 5 ppm concentration of dye treated with 1 mg/mL concentration of newlineAS-ZnONPs. In the case of AS-AgNPs, RB220 and RB222A dyes showed positive results but no degradation was observed in the remaining three dyes. After 320 min of UV light exposure, AS-AgNP…
creator: Juhi, P J
source: Author's Submission
publisher: Christ(Deemed to be University)
date: 2024-01-01
contributor: Joseph, K S
rights: Open Access
relation: 61000407
format: PDF
language: English
type: PhD

Photocatalytic Degradation of Textile Dyes Using Quassia india (Gaertn.) Noot. Mediated Nanoparticles
subject: Life Sciences
description: Prognostic research points at the necessity and relevance of revamping polluted newlineenvironments. The toxic effect of textile dyes released into waterbodies can be reduced newlineby the degradation process and alternate methods in nanotechnology are used to lessen newlinethe gravity of the situation. Compared with chemical and physical nanoparticle synthesis, plant extract-based nanoparticle synthesis is an environmentally friendly alternative method. UV-visible spectrum analysis validated the production of nanoparticles (NPs), revealing unique peaks at 430 nm for Quassia indica (QI)- mediated Silver nanoparticles (QI-Ag NPs), 368 nm for QI-mediated Cobalt oxide nanoparticles (QI-Co3O4 NPs), 348 nm for QI-mediated Zinc oxide nanoparticles (QIZnO NPs, 350 nm and 408 nm for QI-mediated Silver/Zinc oxide nanoparticles (QIAg/ZnO NPs), 415 nm and 675 nm for QI-mediated Cobalt oxide/Zinc oxide newlinenanoparticles (QI-Co3O4/ZnO NPs). Fourier Transform Infrared Spectroscopy (FTIR) newlineinvestigation identified phytochemicals involved in nanoparticle synthesis. The X- Ray Diffraction (XRD) examination unveiled the crystalline structures of QI-mediated NPs. Dynamic Light Scattering (DLS) study revealed information on the hydrodynamic newlinediameter and colloidal stability of the NPs, which showed average particle size. Field newlineEmission Scanning Electron Microscopy (FE-SEM) and Energy-Dispersive X-Ray newlineSpectroscopy (EDX) were used to investigate the morphology and elemental composition of NPs. The morphological shapes of QI-Ag NPs were spherical, QI-ZnO NPs showed hexagonal, QI-Co3O4 NPs displayed octahedral, QI-Ag/ZnO NPs exhibited spherical structure, and QI-Co3O4/ZnO NPs unveiled a mixture of octahedral and hexagonal shaped NPs. The High-resolution Transmission Electron Microscopy (HR-TEM) validated the NPs size and Selected Area Electron Diffraction (SAED) newlineconfirmed the crystalline characteristics.
creator: Shilpa, Susan Scaria
source: Author's Submission
publisher: Christ(Deemed to be University)
date: 2024-01-01
contributor: Joseph, K S
rights: Open Access
relation: 61000408
format: PDF
language: English
type: PhD

Photocatalytic Degradation of Textile Dyes Using Strobilanthes Species Mediated Nanoparticles
subject: Life Sciences
description: Discharge of dye pollutants from textile industries jeopardizes ecosystem by leading to grave threats like contamination of water resources and hazardous health effects. The current study points and focuses at the synthesis, characterization, dye degradation and toxicity analysis of zinc oxide nanoparticles (ZnO NPs) and silver nanoparticles (Ag NPs) derived from Strobilanthes barbatus and Strobilanthes hamiltoniana leaf extracts. UV-visible spectrum analysis validated the biogenesis of ZnO and Ag NPs, revealing unique peaks at 359 nm for ZnOSB NPs, 360 nm for ZnOSH NPs, 428 nm for AgSB NPs, and 432 nm for AgSH NPs. Fourier transform infrared spectroscopy (FTIR) investigation identified phytochemicals involved in nanoparticle synthesis, manifesting the presence of flavonoids, saponins and alkaloids. The X-ray diffraction (XRD) examination disclosed the crystalline structures of ZnOSB NPs, ZnOSH NPs, AgSB NPs and AgSH NPs displayed an average crystalline size of 22.29 nm, 26.9 nm, 23.5 nm and 20.6 nm. Dynamic Light Scattering (DLS) study revealed information on the hydrodynamic diameter and colloidal stability of the NPs, which showed average particle size for ZnOSB NPs, ZnOSH NPs, AgSB NPs and AgSH NPs as 91.6 nm, 165.4 nm, 142.3 nm and 255.3 nm. Field Emission Scanning Electron Microscopy (FESEM) and Energy-dispersive X-ray spectroscopy (EDS) were used to investigate the morphology and elemental composition of ZnO NPs and Ag NPs, revealing particle shape and size variations. The morphological shapes of ZnOSB NPs were spherically shaped NPs, ZnOSH NPs showed rod-shaped NPs, AgSB NPs and AgSH NPs both showed spherical-shaped NPs. The High-resolution Transmission Electron Microscopy (HRTEM) validated the nanoparticles' size and crystalline characteristics, similar to FESEM. The photocatalytic degradation of textile dyes using ZnO NPs and Ag NPs were researched, and the results revealed that diverse dyes degraded efficiently under UV light exposure. The ZnO NPs and Ag …
creator: Gangwar, Jaya
source: Author's Submission
publisher: Christ(Deemed to be University)
date: 2024-01-01
contributor: K S, Joseph
rights: Open Access
relation: 61000372
format: PDF
language: English
type: PhD

Photocatalytic Degradation of Toxic Textile Dyes by Biosynthesized Silver Nanoparticles Synthesized from Strobilanthes hamiltoniana Leaf Extract
subject: Photocatalytic degradation; Phytotoxicity; Reactive blue dyes; Silver nanoparticles; Water pollution
description: Biocompatible nanoparticle synthesis from Strobilanthes hamiltoniana leaf extracts is an ecologically friendly, cost-effective and long-lasting technique for wastewater treatment, particularly for textile dye degradation. S. hamiltoniana mediated silver nanoparticles (SH-Ag NPs) showed a maximum absorbance of 432 nm. Based on the FESEM analysis, the SH-Ag NPs were usually spherical with an average diameter of nm. The FTIR analyses revealed the significance of functional groups in the formation of SH-Ag NPs. Degradation and rate of degradation for textile dyes after 320 min, SH-Ag NPs displayed 88.4%, 79.49%, 0.0059 min-1 and 0.00495 min-1 for reactive blue 220 (RB-220) and reactive blue 222A (RB-222A) dyes. The phytotoxicity study of SH-Ag NPs treated dye solutions demonstrated a significant decrease in inhibitory efficiency when compared to dye effluents. The biosynthesized SH-Ag NPs could represent a viable catalyst alternative for treating textile dye degradation both before and after it enters aquatic environments. 2024 Asian Publication Corporation. All rights reserved.
creator: Gangwar J.; Joseph K.S.
source: Asian Journal of Chemistry, Vol-36, No. 2, pp. 498-504.
publisher: Asian Publication Corporation
date: 2024-01-01
rights: All Open Access; Gold Open Access
relation: ISSN: 9707077; CODEN: AJCHE
format: Online
language: English
type: Article
coverage: Gangwar J., Department of Life Sciences, Christ University, Bangalore, 560029, India; Joseph K.S., Department of Life Sciences, Christ University, Bangalore, 560029, India

Photocatalytic driven self-cleaning IPN membranes infused with a host-guest pair consisting of metal-organic framework encapsulated anionic nano-clusters for water remediation
subject: Antimicrobial; Interpenetrating polymer networks; Metal-organic framework; Photocatalytic membrane; Polyoxometalate; Self-cleaning; Water treatment
description: Traditional water treatment membranes frequently encounter challenges in attaining an ideal equilibrium between permeability and selectivity. The performance of membranes is further hampered by hydrophobicity, scalability, and fouling problems, as well as excessive energy consumption. Hence, the current research is dedicated to the development of highly effective antifouling membranes, aiming for a significant balance between water permeance and separation efficiency, and featuring exceptional photocatalytic self-cleaning properties to ensure the sustainable reuse of membranes. In this study, a unique nanocomposite-based membrane is designed containing metal-organic frameworks (MOFs) MIL-101 (Fe) encapsulated copper-containing polyoxometalate (Cu-POM) incorporated into an interpenetrating polymer networks (IPNs) membrane. POMs are highly electronegative, oxo-enriched nanosized metal-oxygen cluster species and when composited with MOF yields POMOF which can help in the removal of pollutants from water through electrostatic site-specific binding. The IPN membrane designed by polymerizing aniline in the presence of polyvinylidene fluoride (PVDF) offers tunable pores of the membrane. The infusion of POMOF imparts a strong negative charge to the membrane surface, improving membrane hydrophilicity. This enhances pollutant removal through the Donnan exclusion principle and adds anti-fouling properties. Furthermore, the reduced pore size achieved by the IPN architecture in the POMOF@IPNs membrane effectively sieves out both cationic and anionic dyes, as well as pharmaceutical pollutants. Additionally, POMOF enhances the photocatalytic degradation of CR and MB dyes, coupled with essential self-cleaning attributes vital for separation processes. The IPNs structure, apart from housing POMOF, fortifies the membrane's mechanical strength with its distinctive network-like configuration. Furthermore, these advanced membranes showcase robust antibacterial and antiviral characterist…
creator: Dutta S.; Patel B.G.M.; Singh Y.; Hegde G.; Bose S.
source: Journal of Membrane Science, Vol-694
publisher: Elsevier B.V.
date: 2024-01-01
rights: Restricted Access
relation: ISSN: 3767388; CODEN: JMESD
format: Online
language: English
type: Article
coverage: Dutta S., Department of Materials Engineering, Indian Institute of Science, Karnataka, Bengaluru, 560012, India; Patel B.G.M., Centre for Advanced Research and Development (CARD), CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India, Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India; Singh Y., Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India; Hegde G., Centre for Advanced Research and Development (CARD), CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India, Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India; Bose S., Department of Materials Engineering, Indian Institute of Science, Karnataka, Bengaluru, 560012, India

Photocatalytic nanomaterials: Applications for remediation of toxic polycyclic aromatic hydrocarbons and green management
subject: Bioremediation; Metal oxides; Nanomaterials; PAHs; Semiconductor photocatalysis
description: Nanomaterials (NMs) have piqued the attention of scientists and researchers across many biomedical sciences due to their superior physical, chemical, and magnetic properties. The efficacy and efficiency of NMs depend on adapting to specific site conditions and soil composition. NMs have lately received much attention in the context of polycyclic aromatic hydrocarbons (PAHs) polluted soil remediation and water mitigation because of their unique properties resulting from their nanoscale sizes. The remediation of hazardous PAHs in water and soil is a hot research subject. Because the exposure of PAHs in water and soil results in pollution, which raises major human health concerns. The current review reports novel advancements in NMs that subsidize enhancement for degradation of PAHs. Challenges to the fabrication of high activity-based photocatalytic materials are also discussed. Furthermore, this review delivers exclusive and wide-ranging perspectives on the fabrication of nanomaterial-based photocatalytic systems. The knowledge of both soil remediation and water mitigation is also updated. 2022
creator: Dutta V.; Devasia J.; Chauhan A.; M J.; L V.V.; Jha A.; Nizam A.; Lin K.-Y.A.; Ghotekar S.
source: Chemical Engineering Journal Advances, Vol-11
publisher: Elsevier B.V.
date: 2022-01-01
rights: All Open Access; Gold Open Access
relation: ISSN: 26668211
format: Online
language: English
type: Article
coverage: Dutta V., Advanced School of Chemical Sciences, Shoolini University, Himachal Pradesh, Solan, 173212, India; Devasia J., Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bangalore, 560029, India; Chauhan A., Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Tamil Nadu, Kelambakkam, Kanchipuram, 603103, India; M J., Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bangalore, 560029, India; L V.V., Department of Life Sciences, CHRIST (Deemed to be University), Karnataka, Bangalore, 560029, India; Jha A., University Institute of Biotechnology, Chandigarh University, Punjab, Gharuan, 140413, India; Nizam A., Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bangalore, 560029, India; Lin K.-Y.A., Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan; Ghotekar S., Department of Chemistry, Smt. Devkiba Mohansinhji Chauhan College of Commerce and Science, University of Mumbai, Dadra and Nagar Haveli (UT), Silvassa, 396 230, India

Photocatalytic seawater splitting for hydrogen fuel production: impact of seawater components and accelerating reagents on the overall performance
description: The future fuel, hydrogen, is a clean, sustainable energy source with a substantial density of energy per unit volume/weight. Breakthroughs in hydrogen production, storage, and transportation are essential to meet the sustainable global energy demands. Solar-to-hydrogen conversion through water-splitting reactions (via photo/electro/photoelectro-processes) is a promising strategy for producing green hydrogen fuel. Specifically, the photocatalytic hydrogen generation reaction, mimicking artificial photosynthesis, is a simple and cost-effective method adopted for solar-hydrogen production. Various semiconductor photocatalysts and hybrid photocatalytic systems have been developed to address the sluggish kinetics and selectivity of pristine water/seawater splitting reactions. Recently, seawater has been used as feedstock for large-scale hydrogen production to advance the field and alleviate the scarcity of freshwater sources. This review article, therefore, aims to highlight the importance of seawater splitting reactions using different photocatalytic systems. A brief introduction to the fundamentals, historical progress, and mechanism of the seawater splitting reaction is presented. The impact of seawater components and accelerating reagents on the intrinsic performance of water splitting catalysts is discussed in detail, followed by an elaborate discussion of natural water and artificial seawater splitting with emphasis on onerous photocatalyst designs. Finally, the current challenges and opportunities of saltwater electrolysis for sustainable hydrogen fuel generation and applications are discussed. 2023 The Royal Society of Chemistry.
creator: Yesupatham M.S.; Augustin A.; Agamendran N.; Honnappa B.; Shanmugam M.; Sagayaraj P.J.J.; Thennarasu G.; Sagaya Selvam N.C.; Sekar K.
source: Sustainable Energy and Fuels, Vol-7, No. 19, pp. 4727-4757.
publisher: Royal Society of Chemistry
date: 2023-01-01
rights: Restricted Access
relation: ISSN: 23984902
format: Online
language: English
type: Review
coverage: Yesupatham M.S., Sustainable Energy and Environmental Research Laboratory, Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India; Augustin A., Sustainable Energy and Environmental Research Laboratory, Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India; Agamendran N., Sustainable Energy and Environmental Research Laboratory, Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India; Honnappa B., Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India; Shanmugam M., Sustainable Energy and Environmental Research Laboratory, Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India; Sagayaraj P.J.J., Sustainable Energy and Environmental Research Laboratory, Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India; Thennarasu G., Department of Chemistry, C. Kandaswami Naidu College for Men (A Unit of Pachaiyappa's Trust), Chennai, 600102, India; Sagaya Selvam N.C., Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bangalore, 560029, India; Sekar K., Sustainable Energy and Environmental Research Laboratory, Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Tamil Nadu, Kattankulathur, 603203, India

Photoisomerization Dynamics of 2-[(E)-(4-fluorophenyl)diazenyl]-1 H -imidazole: A Theoretical and Experimental Insight
subject: Azoimidazole; nonlinear optics; optical limiters; photoisomerization; TD-DFT
description: This study investigates the photoresponsive behavior of substituted azobenzenes with a specific focus on their nonlinear optical response. This study suggests that azoimidazole substitution is a better alternative to azobenzene derivatives for nonlinear optical responses. The synthesis, characterization, photophysical property and isomerization pathway of 2-[(E)-(4-fluorophenyl)diazenyl]-1H-imidazole (E-2g) are presented as an optical limiter through a comprehensive blend of experimental and theoretical approaches. Notably, E-2g exhibited a lower energy barrier than reported azobenzenes. The trans-to-cis photostationary state was reached in 75 min, while the cis-to-trans state was achieved in 60 min at 354 nm. The study further explores the photoisomerization pathway of E-2g, highlighting its nonlinear absorption, which has a nonlinear absorption coefficient (?eff) of 8.8 10-11 m/W at 20 ?J, as determined by Z-scan measurements. The results suggest that E-2g exhibits significant nonlinear absorption characteristics, which helps in applications requiring protection from intense light sources. 2024 World Scientific Publishing Company.
creator: John A.M.; Xavier S.S.; Benny C.; Philip R.; Balakrishnan S.P.
source: Journal of Computational Biophysics and Chemistry
publisher: World Scientific
date: 2024-01-01
rights: Restricted Access
relation: ISSN: 27374165
format: Online
language: English
type: Article
coverage: John A.M., Department of Chemistry, School of Sciences, Christ University, Central Campus, Karnataka, Bengaluru, 560029, India; Xavier S.S., Light and Matter Physics Group, Raman Research Institute, C.V. Raman Avenue, Karnataka, Bangalore, 560080, India; Benny C., Light and Matter Physics Group, Raman Research Institute, C.V. Raman Avenue, Karnataka, Bangalore, 560080, India; Philip R., Light and Matter Physics Group, Raman Research Institute, C.V. Raman Avenue, Karnataka, Bangalore, 560080, India; Balakrishnan S.P., Department of Chemistry, School of Sciences, Christ University, Central Campus, Karnataka, Bengaluru, 560029, India

Photoluminescence studies of non-toxic monoclinic yttrium oxide quantum dots synthesized at low temperature for live cell imaging applications
subject: Bioimaging; Intense blue emission; Low temperature; Non-toxic monoclinic yttrium oxide
description: Synthesis of monoclinic Y2O3 remains a challenging task due to complex formation conditions such as high pressure or high temperature environments. Monoclinic yttria exhibits better photoluminescence characteristics compared to the cubic phase and hence can be a better host for nanophosphors. Reports are available predicting the stability of monoclinic phase at low temperature in extremely fine particles. But experimental preparation of this phase at low temperature is not yet reported. Here we report the first-time preparation of monoclinic Y2O3 at 90 C using simple laboratory hot air oven. The synthesized nanoparticles exhibit intense PL emission in the blue region and hence can find applications in display industry. The band structure calculations were carried out using density functional theory and the excitonic Bohr radius was estimated using the electron as well as hole effective masses determined from band structure. The cytotoxicity studies reveal non-toxic nature the particles. The fluorescence imaging experiments show that the material is capable of emitting blue fluorescence in L6 skeletal cell lines and it ensures the applicability of this material in the biomedical field. 2022 Elsevier Ltd and Techna Group S.r.l.
creator: Nath S.G.; Anila E.I.
source: Ceramics International, Vol-49, No. 8, pp. 13200-13207.
publisher: Elsevier Ltd
date: 2023-01-01
rights: Restricted Access
relation: ISSN: 2728842; CODEN: CINND
format: Online
language: English
type: Article
coverage: Nath S.G., Optoelectronics and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, Kerala, 683102, India; Anila E.I., Optoelectronics and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, Kerala, 683102, India, CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India

Photometric and spectroscopic study of candidate be stars in the magellanic clouds
description: [No abstract available]
creator: Paul K.T.; Subramaniam A.; Mathew B.; Mennickent R.E.; Sabogal B.
source: Proceedings of the International Astronomical Union, Vol-6, No. S272, pp. 294-295.
publisher: Cambridge University Press
date: 2011-01-01
rights: All Open Access; Bronze Open Access
relation: ISSN: 17439213; ISBN: 978-052119840-0
format: Online
language: English
type: Conference paper
coverage: Paul K.T., Christ University, Bangalore, India; Subramaniam A., Indian institute of Astrophysics, Bangalore, India; Mathew B., Indian institute of Astrophysics, Bangalore, India; Mennickent R.E., University of Concepcion, Chile; Sabogal B., Universidad de los Andes, Colombia

Photometric identification of objects from galaxy evolution explorer survey and sloan digital sky survey
subject: Dust; Extinction; galaxies:Photometry; galaxy; General; hertzsprungrussell and colour; magnitude diagrams; stars:General; techniques:Photometric
description: We have used Galaxy Evolution Explorer (GALEX) and Sloan Digital Sky Survey (SDSS) observations to extract seven band photometric magnitudes for over 80 000 objects in the vicinity of the North Galactic Pole. Although these had been identified as stars by the SDSS pipeline, we found through fitting with model spectral energy distributions that most were, in fact, of extragalactic origin. Only about 9 per cent of these objects turned out to be mainsequence stars and about 11 per cent were white dwarfs and red giants collectively, while galaxies and quasars contributed to the remaining 80 per cent of the data. We have classified these objects into different spectral types (for the stars) and into different galactic types (for the galaxies). As part of our fitting procedure, we derive the distance and extinction to each object and the photometric redshift towards galaxies and quasars. This method easily allows for the addition of any number of observations to cover a more diverse range of wavelengths, as well as the addition of any number of model templates. The primary objective of this work is to eventually derive a three-dimensional extinction map of the Milky Way Galaxy. 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
creator: Preethi K.; Gudennavar S.B.; Bubbly S.G.; Murthy J.; Brosch N.
source: Monthly Notices of the Royal Astronomical Society, Vol-437, No. 1, pp. 771-776.
publisher: Oxford University Press
date: 2013-01-01
rights: All Open Access; Bronze Open Access; Green Open Access
relation: ISSN: 358711; CODEN: MNRAA
format: Online
language: English
type: Article
coverage: Preethi K., Department of Physics, Christ University, Bangalore 560 029, India; Gudennavar S.B., Department of Physics, Christ University, Bangalore 560 029, India; Bubbly S.G., Department of Physics, Christ University, Bangalore 560 029, India; Murthy J., Indian Institute of Astrophysics, Bangalore 560 034, II Block, Koramangala, India; Brosch N., The Wise Observatory and the School of Physics and Astronomy, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel

Photon, Electron, Proton and Alpha Particle Interaction Parameters of Different Clays
subject: Clay samples; Mass attenuation coefficient; Mass stopping power; Radiation shielding; Zeff
description: Modern life has made human beings and nature vulnerable to harmful radiations at different levels. This can be a great health hazard of our times. Since there is no probability of dodging the harmful influence, the practical way out is having protective shielding. Lead, the most efficient attenuator in current use has the drawbacks of being heavy, toxic and capable of producing secondary radiations. Other attenuators concrete, glass etc. have similar deficits in use. This is the context of the scientific world's quest for a perfect shielding material which can provide protection from harmful radiations effectively, economically and environment friendly. This work attempts a computational study on the radiation shielding efficiency of different types of clays, understanding of which would enable its applications for radiation shielding. The presence of high Z elements and the layered structure of clay along with its good thermal stability make it ideal filler for an effective radiation shield. In this work, we have performed a systematic study of the mass attenuation coefficients, effective atomic number and electron density of various clay samples. 2022 American Institute of Physics Inc.. All rights reserved.
creator: Parvathi V.; Bubbly S.G.; Gudennavar S.B.
source: AIP Conference Proceedings, Vol-2446
publisher: American Institute of Physics Inc.
date: 2022-01-01
rights: Restricted Access
relation: ISSN: 0094243X; ISBN: 978-073544208-5
format: Online
language: English
type: Conference paper
coverage: Parvathi V., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore Central Campus, Karnataka, Bengaluru, 560029, India; Bubbly S.G., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore Central Campus, Karnataka, Bengaluru, 560029, India; Gudennavar S.B., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore Central Campus, Karnataka, Bengaluru, 560029, India

Photonic crystal based piston type micro pressure sensor /
subject: Physics
description: Patent Number: 201741047023, Applicant: Dr. Preeta Sharan. A pressure sensor comprising, A two piston shaped slab structure placed invertedly, this two piston are ket such that there is physical gap between them. Further the micro pressure is applied from top and bottom end.
creator: O V, Johnson.
source: https://drive.google.com/file/d/1KUt7RSZ0MYFnyK9G4L-5bY7mQVik4XQh/view
publisher: Intellectual Property India
date: 2019-03-15
language: English
type: Patent

Photophysical and antitubercular studies on newly synthesised structurally architectured sulphonamide
subject: Antitubercular potency; azo dye; chemical reactivity parameters; DFT studies; MESP
description: This study presents the synthesis and characterisation of four mono-azo sulphonamide derivatives through diazo-coupling electrophilic substitution reactions. The structural analysis of the synthesised molecules was conducted utilising FT-IR, 1H-NMR and HR-MS techniques. Absorption and fluorescence maxima of the synthesised molecules were determined across solvents of varying polarity to explore Solvatochromic behaviour. Density functional theory was employed to elucidate electronic and optical properties, including the computation of HOMOLUMO energies using Gaussian 09W software, with comparisons to experimental data. Molecular electrostatic potential 3D plots identified electrophilic and nucleophilic sites. Solvent interactions were evaluated using KamletAbboud Taft and Catalan parameters. Further, global chemical reactivity descriptors were estimated to ascertain chemical reactivity of the molecules. Additionally, the effectiveness of the colourant anti-tubercular activity was evaluated using in vitro and molecular docking techniques. The biological activity results reveal that methyl-pyridone and barbituric acid coupled with sulphamethizole (SMP and SMB) displayed excellent anti-tubercular activity compared with the standard Gentamycin. 2024 Informa UK Limited, trading as Taylor & Francis Group.
creator: Shekharagouda P.; Mamatha G.P.; Nagaraju G.; Krishnamurthy C.; Sajjan V.P.; Ali Al-Asbahi B.; Mohammed Al-Hada N.; Gowda B.G.; Naik L.
source: Molecular Physics
publisher: Taylor and Francis Ltd.
date: 2024-01-01
rights: Restricted Access
relation: ISSN: 268976; CODEN: MOPHA
format: Online
language: English
type: Article
coverage: Shekharagouda P., Department of Studies in Chemistry, Davangere University, Davanagere, India; Mamatha G.P., Department of Studies in Chemistry, Davangere University, Davanagere, India; Nagaraju G., Energy Material Research Laboratory, Department of Chemistry, Siddaganga Institute of Technology, Tumakuru, India; Krishnamurthy C., Department of PG Studies and Research in Chemistry, Kuvempu University, Shivamogga, India; Sajjan V.P., Department of Chemistry, Rani Channamma University, Belagavi, India; Ali Al-Asbahi B., Department of Physics & Astronomy, College of Science, King Saud University, Riyadh, Saudi Arabia; Mohammed Al-Hada N., Shandong Key Laboratory of Biophysics, Institute of Biophysics, Dezhou University, Dezhou, China; Gowda B.G., Department of Chemistry, Maharani Cluster University, Bangalore, India; Naik L., Department of Physics and Electronics, CHRIST University, Bengaluru, Bengaluru, India

Photophysical and Electrochemical Studies of Anchored Chromium (III) Complex on Reduced Graphene Oxide via Diazonium Chemistry
subject: anchored chromium complex; cis-trans switch; electrochemical detection of paracetamol; functionalization of GO/rGO; graphene oxide hybrid material; immobilized compounds; photoluminescence
description: Covalently anchored chromium complex on reduced graphene oxide (rGO-Cr) is successfully synthesised through trimethoxy silyl propanamine (TMSPA) and phenyl azo salicylaldehyde (PAS) coupling. The rGO-Cr is characterised by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron dispersive analysis of X-rays (EDAX), Raman spectroscopy, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). Absorption and emission properties of rGO-TMSPA-PAS are studied by excitation dependent photoluminescence emissions at room temperature. Electrochemical sensing activity of rGO-Cr is monitored for paracetamol using modified glassy carbon electrode. Cyclic voltammetry measurements indicated that rGO-Cr substantially enhance the eletrochemical response of paracetamol. The experimental factors are investigated and optimized. 2019 John Wiley & Sons, Ltd.
creator: Jose J.; Rajamani A.R.; Anandaram S.; Jose S.P.; Peter S.C.; Sreeja P.B.
source: Applied Organometallic Chemistry, Vol-33, No. 9
publisher: John Wiley and Sons Ltd
date: 2019-01-01
rights: Restricted Access
relation: ISSN: 2682605; CODEN: AOCHE
format: Online
language: English
type: Article
coverage: Jose J., Department of Chemistry, CHRIST (Deemed to be University), Bengaluru, 560029, India; Rajamani A.R., New Chemistry Unit, School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru, 560064, India; Anandaram S., Department of Chemistry, National Institute of Technology, Tiruchirappalli, 620015, India; Jose S.P., School of Physics, Madurai Kamaraj University, Madurai, 625021, India; Peter S.C., New Chemistry Unit, School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru, 560064, India; Sreeja P.B., Department of Chemistry, CHRIST (Deemed to be University), Bengaluru, 560029, India

Photophysical and In Vitro-In Silico Studies on Newly Synthesized Ethyl 3-((3-Methyl-1-phenyl-1H-pyrazol-5-yl)oxy)-2-methyleneheptanoate
subject: HOMOLUMO; in vitro and in silico biological activity; MESP; NBO; pyrazolones
description: Abstract: In the present work, the aryl-substituted pyrazolone derivative ethyl 3-((3-methyl-1-phenyl-1H-pyrazol-5-yl)oxy)-2-methyleneheptanoate (ETT) has been synthesized by the reaction of Baylis-Hillman acetate with pyrazolones and screened for their in vitro antifungal, antibacterial, and antioxidant properties. The molecule shows good in vitro antifungal and antibacterial activities due to the presence of pentane, which enhances the absorption rate by its increased lipid solubility and improves the pharmacological activity. It is also evident from the results obtained from structure-activity relationship (SAR) studies. In silico studies were conducted on the synthesized molecule, examining its interactions with DNA Gyrase, Lanosterol14 alpha demethylase, and KEAP1-NRF2 proteins. The results revealed strong binding interactions at specific sites. Further, the photophysical properties of synthesized compounds were theoretically estimated using the ab-intio technique. The ground state optimization, dipole moment, and HOMOLUMO energy levels are calculated using the DFT-B3LYP-6-31G(d) basis set. Using the theoretically estimated HOMOLUMO value, global chemical reactivity descriptor parameters are estimated, and the result shows the synthesised molecule has a highly electronegative and electrophilic index. NBO analysis proved the presence of intermolecular ON.H hydrogen bonds caused by the interaction of the lone pair of oxygen with the anti-bonding orbital. The results suggest that pentane-substituted pyrazolone derivatives show good photophysical and biological applications. Pleiades Publishing, Ltd. 2024.
creator: Marrakkur V.; Sukanya G.; Al-Asbahi B.A.; Al-Hada N.M.; Kapavarapu R.; Naik L.
source: Russian Journal of Organic Chemistry, Vol-60, No. 7, pp. 1176-1185.
publisher: Pleiades Publishing
date: 2024-01-01
rights: Restricted Access
relation: ISSN: 10704280; CODEN: RJOCE
format: Online
language: English
type: Article
coverage: Marrakkur V., Department of Chemistry, NMKRV College for Women, Bengaluru, 560063, India; Sukanya G., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Al-Asbahi B.A., Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia; Al-Hada N.M., Shandong Key Laboratory of Biophysics, Institute of Biophysics, Dezhou University, Dezhou, 253023, China; Kapavarapu R., Department of Pharmaceutical Chemistry and Phytochemistry, Nirmala College of Pharmacy, Atmakur, Mangalagiri Mandalm Andhra Pradesh, 522503, India; Naik L., Department of Physics and Electronics, CHRIST (Deemed to be University), Bengaluru, 560029, India

https://archives.christuniversity.in/items/show/17157
title: Photophysical study of 6-amino-3-methyl-4-(4-nitrophenyl)-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile and estimation of ground-state and singlet excited-state dipole moments by solvatochromic approaches
subject: Dipole moment; Intra-molecular charge transfer; Solvatochromic method; Stokes shift ETN
description: An investigation of absorption and fluorescence behaviour of 6-amino-3-methyl-4-(4-nitrophenyl)-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile (NDPPC) at room temperature was carried out using a series of twelve organic solvents with different polarities. Ground and excited state dipole moments were determined experimentally by using LippertMataga polarity function, Bakhshiev solvent polarity parameter, Kawski-Chamma-Viallet solvent polarity parameter, Reichardt's microscopic solvent polarity parameter, Kamlet-Abboud-Taft multiple linear regression and Catalan dipolar polarizibility approach. Due to considerable ?- electron density redistribution, the value of excited state dipole moment was found to be greater than that of the ground state. The ground state dipole moment value was determined by quantum chemical method which was used to estimate excited state dipole moment using solvatochromic correlations. Both non-specific solute-solvent interactions and hydrogen bonding interactions were investigated by using Kamlet-Abboud-Taft and Catalan method. TD-DFT (B3LYP/6-311G (d,p)) was used for the determination of HOMO-LUMO energies. 2016 Elsevier B.V.
creator: Kumari R.; Varghese A.; George L.; K.B. A.
source: Journal of Molecular Liquids, Vol-222, pp. 828-835.
publisher: Elsevier B.V.
date: 2016-01-01
rights: Restricted Access
relation: ISSN: 1677322; CODEN: JMLID
format: Online
language: English
type: Article
coverage: Kumari R., Department of Chemistry, Christ University, Bangalore, 560 029, India; Varghese A., Department of Chemistry, Christ University, Bangalore, 560 029, India; George L., Department of Chemistry, Christ University, Bangalore, 560 029, India; K.B. A., Department of Chemistry, Christ University, Bangalore, 560 029, India

Photoresponse and electrochemical behaviour of azobenzene anchored graphene oxide for energy storage application
subject: Azobenzene; Energy storage; Graphene oxide hybrid; Photoactive material; Photoisomerization; Solar thermal fuels
description: Solar energy is considered to be a renewable source of energy that is intrinsically more sustainable than fossil fuels. Developing photoactive hybrid materials to store solar energy has recently received much attention. Herein, a photoactive molecule-graphene oxide hybrid was synthesized and characterized systematically. The solar energy storage performances of the hybrids were studied using various photophysical studies. The energy density and power density of the hybrid materials were 47 WhKg?1 and 156.6 WKg-1 respectively which showed 3 fold higher than the pristine compound. The photoelectrochemical behaviour of the hybrid were also studied using Cyclic voltammetry and Electrochemical impedance spectroscopy (EIS). Results showed the electrochemical performances can be varied due to their changing conformations from trans-to-cis isomerization. This work enables the research community in developing a promising material for solar thermal fuels as well as in energy storage devices. 2023 Elsevier B.V.
creator: Baby A.; Abinaya S.; John A.M.; Jose S.P.; Balakrishnan S.P.
source: Materials Chemistry and Physics, Vol-301
publisher: Elsevier Ltd
date: 2023-01-01
rights: Restricted Access
relation: ISSN: 2540584; CODEN: MCHPD
format: Online
language: English
type: Article
coverage: Baby A., Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India; Abinaya S., Nano Laboratory, School of Physics, Madurai Kamaraj University, Madurai, 625021, India; John A.M., Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India; Jose S.P., Nano Laboratory, School of Physics, Madurai Kamaraj University, Madurai, 625021, India; Balakrishnan S.P., Department of Chemistry, CHRIST (Deemed to be University), Karnataka, Bengaluru, 560029, India