c) 2023 - 131 Documents
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Item SYMBIOTIC STUDY OF N-BRIDGED METAL COMPLEXES AS ELECTROCATALYSTS FOR HYDROGEN EVOLUTION REACTION(Elsevier, 2023-08-14) Arunadevi, Natarajan; Swathika, M; Kshitij RB, Singh; Ranjana, Verma; Shyam S, Pandey; Jay, SinghDesign and fabrication of non-noble metal catalysts for the extensive generation of H2 (hydrogen) gas by water splitting is the upsurging field aiming towards the sustainable environment and need the future clean and green energy. However, scheming and understanding the basic principle regulating the activity of the catalyst is still inexplicable. Although Pt is currently the material of choice owing to its high electrocatalytic activities but need for its high loading and high cost is an intriguing issue needing amicable solution. The hybrid structures of heteroatom-based transition metal complexes are more effective and are cost effective electrocatalysts for hydrogen production. In this proposed work, the electrocatalytic behaviour of alkali (Li+, Na+, K+) and alkaline metal (Ca2+, Sr2+, Ba2+) was figured out along with their synthetic procedure and characterization. Owing to their high complexing ability, ring formation, and bidentate nature, substituted naphthoic acid and aminoguanidine were chosen as bridging ligands. The thermodynamic stability and best catalytic behaviour of synthesized alkali and alkaline earth metals were compared and presented based on electrochemical studies. Linear sweep voltammetry (LSV) curves display excellent activity and Tafel slope was found in the range of 6.38–40 mVdec−1 in 0.5 M H2SO4. The electrochemical impedance spectroscopy (EIS) test was accomplished to recognize the mechanism of HER, and charge transfer resistance was less which indicates that composites are favourable for the hydrogen evolution. The electrochemical surface area (ECSA) was figured by studying the electric double layer capacitance (C dl) and it was found to be 0.377 μFcm2 - 0.143 μFcm2. More prominent ECSA values implies, the target complexes have enhanced electrochemically active/dynamic sites and better hydrogen evolution performance. According to the results, high-performing catalytically active sites are found to be Li [1NA-AMG] metal ions, thus showing a potential method for electrocatalyst engineering. Furthermore, in a volcano plot, the position of the Li [1NA-AMG] metal ions is found to be close to the apex with near thermoneutral catalytic activity. Based on the results, we successfully designed an electrocatalyst as a prospective candidate for hydrogen evolution reaction.Item SYNTHESIS AND PHOTOMETRIC PROPERTIES OF EFFICIENT WHITE-EMITTING PHOSPHOR OF M-AMG TRANSITION METAL COMPLEXES FOR OLED APPLICATIONS(Wiley Analytical Science, 2023) Manoharan, Swathika; Arunadevi, NatarajanProgression in lighting sources mainly depended on new, robust energy-efficient diodes due to their advanced photometric properties. All organic light-emitting sources are constant energy-efficient devices and will be the light of the future. We explore the potential of transition metal complexes by focusing on cobalt(II), nickel(II), and copper (II) with aminoguanidine naphthoate as white phosphors in organic light-emitting diodes (OLEDs). The phosphors synthesized at optimized temperature were characterized structurally and thermally by spectral, thermal, and diffraction techniques. The photophysical studies of the target compound in several organic solvents having divergent polarity were also studied, and the results were exhibited. Photometric properties of the complexes were studied using photoluminescence, CIE (Commission internationale de l'éclairage) chromaticity coordinates, correlated color temperature, color purity, Duv, and TLCI (Television Lighting Consistency Index) to verify the applicability of complexes as phosphors. Excellent luminescence property with a high coloring index for (Cu(2NA-AMG-2H2O)) opens the advanced avenue for light sources and serves as vital constituents for light-emitting diodes.Item POTENTIALITIES OF FLUORESCENT CARBON NANOMATERIALS AS SENSOR FOR FOOD ANALYSIS(Wiley Analytical Science, 2023) Piyali, Sabui; Sadhucharan, Mallick; Kshitij RB, Singh; Arunadevi, Natarajan; Ranjana, Verma; Jay, Singh; Ravindra, Pratap SinghFood safety and quality are among the most significant and prevalent research areas worldwide. The fabrication of appropriate technical procedures or devices for the recognition of hazardous features in foods is essential to safeguard food materials. In the recent era, developing high-performance sensors based on carbon nanomaterial for food safety investigation has made noteworthy progress. Hence this review briefly highlights the different detection approaches (colorimetric sensor, fluorescence sensor, surface-enhanced Raman scattering, surface plasmon resonance, chemiluminescence, and electroluminescence), functional carbon nanomaterials with various dimensions (quantum dots, graphene quantum dots) and detection mechanisms. Further, this review emphasizes the assimilation of carbon nanomaterials with optical sensors to identify multiple contaminants in food products. The insights of carbon-based nanomaterials optical sensors for pesticides and insecticides, toxic metals, antibiotics, microorganisms, and mycotoxins detection are described in detail. Finally, the opportunities and future perspectives of nanomaterials-based optical analytical approaches for detecting various food contaminants are discussed.Item UTILIZING PROTEIN NANOFIBRILS AS A SCAFFOLD FOR ENHANCING NUTRITIONAL VALUE IN TONED MILK(Elsevier, 2023-12-15) Praveetha, Senthilkumar; Arunadevi, Natarajan; Saleh H, Salmen; Sulaiman, Ali Alharbi; Vladimir, Shavrov; Petr, Lega; Ramesh, Subramani; Charumathi, PushparajToned milk is a lower-fat, healthier alternative to whole milk that still contains all essential nutrients. A number of methods have been developed to improve the functionality of toned milk and make it more appealing to the consumers. However, these methods often involve extensive processing techniques and can be expensive. Therefore, alternative methods are needed. Proteins are well known for their ability to form well-defined nanofibril materials that can be used as a scaffold for various applications. In this article, a straightforward self-assembly process was used to load inulin into protein nanofibrils, creating unique composite nanofibrils. Characterization using AFM and SEM revealed well-defined composite nanofibrils with an average diameter of 4–6 nm and lengths ranging from 0.25 μm up to 10 μm. FT-IR and in-vitro release assays show that inulin was successfully attached to prepared protein nanofibrils. The composite nanofibrils were tested on toned milk to enhance the physico/chemical properties and nutritional values. The findings can be applied to the food industry to create a number of novel functional food products cost-effectively.Item NANOMEDICINE AND NANOCARRIERS FOR CANCER TREATMENT(Elsevier, 2023) Arunadevi, Natarajan; Suyambulingam, Jone KirubavathyNanomedicine and nanocarrier drug systems are innovative therapeutic concept in which drugs in nano dimensions are employed for diagnostic and treatment for carcinogenic cells. Nanomedicines are emerged as superlative drugs for cancer treatment due to their small size, good penetrating power, and high affinity for binding with drugs. The nanotechnology field provides numerous benefits as therapeutic agents like target drug delivery (DD) with minimal side effects. The current chapter presents the detailed study on different approaches for DD, approved nanocarriers drugs, active and passive targeting, and different kinds of challenges faced. The regulatory issues and safety concerns are also discussed, and this chapter improves the knowledge of cancer treatment with the use of nanotechnology.Item BIOINSPIRED MULTIFUNCTIONAL SILVER NANOPARTICLES FOR OPTICAL SENSING APPLICATIONS: A SUSTAINABLE APPROACH(ACS Publications, 2023-10-18) Kshitij RB, Singh; Arunadevi, Natarajan; Shyam S, PandeySilver nanoparticles developed via biosynthesis are the most fascinating nanosized particles and encompassed with excellent physicochemical properties. The bioinspired nanoparticles with different shapes and sizes have attracted huge attention due to their stability, low cost, environmental friendliness, and use of less hazardous chemicals. This is an ideal method for synthesizing a range of nanosized metal particles from plants and biomolecules. Optical biosensors are progressively being fabricated for the attainment of sustainability by using opportunities offered by nanotechnology. This review focuses mainly on tuning the optical properties of the metal nanoparticles for optical sensing to explore the importance and applications of bioinspired silver nanoparticles. Further, this review deliberates the role of bioinspired silver nanoparticles (Ag NPs) in biomedical, agricultural, environmental, and energy applications. Profound insight into the antimicrobial properties of these nanoparticles is also appreciated. Tailor-made bioinspired nanoparticles with effectuating characteristics can unsurprisingly target tumor cells and distribute enwrapped payloads intensively. Existing challenges and prospects of bioinspired Ag NPs are also summarized. This review is expected to deliver perceptions about the progress of the next generation of bioinspired Ag NPs and their outstanding performances in various fields by promoting sustainable practices for fabricating optical sensing devices.Item GREEN NANOBIOPOLYMERS FOR ECOLOGICAL APPLICATIONS: A STEP TOWARDS A SUSTAINABLE ENVIRONMENT(Royal Society of Chemistry, 2023-04-20) Preeti, Chincholikar; Kshitij RB, Singh; Arunadevi, Natarajan; Rout George, Kerry; Jay, Singh; Jitendra, Malviya; Ravindra, Pratap SinghTo minimize the usage of non-renewable resources and to maintain a sustainable environment, the exploitation of green nanobiopolymers should be enhanced. Biopolymers are generally developed from various microorganisms and plants in the specified condition. This review article discusses the current advances and trends of biopolymers, particularly in the arena of nanotechnology. In addition, discussion on various synthesis steps and structural characterization of green polymer materials like cellulose, chitin, and lignin is also encompassed. This article aims to coordinate the most recent outputs and possible future utilization of nanobiopolymers to the ecosystem with negligible effects by promoting the utilities of polymeric materials like polycaprolactones, starch, and nanocellulose. Additionally, strategic modification of cellulose into nanocellulose via rearrangement of the polymeric compound to serve various industrial and medical purposes has also been highlighted in the review. Specifically, the process of nanoencapsulation and its advancements in terms of nutritional aspects was also presented. The potential utility of green nanobiopolymers is one of the best cost-effective alternatives concerning circular economy and thereby helps to maintain sustainability.Item MOLECULARLY IMPRINTED POLYMER-BASED OPTICAL IMMUNOSENSORS(Wiley Analytical Science, 2023) Kshitij R B, Singh; Arunadevi, NatarajanMolecularly imprinted polymers (MIPs) are artificial antibodies for a target molecule. The review focuses mainly on mechanistic steps involved in forming MIPs and the role of co-monomers and porogen. In addition, the electronic transition between different energy levels is explained with the help of the Jablonski diagram. Diverse receptor and target molecules for anchoring artificial MIPs are discussed, accentuating the synergetic effects obtained. The binding efficiency, selectivity, and sensitivity of various optical sensors are discussed intensively. In addition to this, we focused on synthesis, physical forms, characterization techniques, and microorganism detection of imprinted polymers. A brief investigation on the use of MIPs in cancer diagnosis is also included, and attention is extended to the important challenges faced in using imprinted polymers.