Journal Articles

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/19884

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Author: search.filters.author.Bhat, D.K.Subject: search.filters.subject.Eco-friendly

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    Enhancement and investigation of biodegradability of poly (methyl methacrylate) and poly (vinyl chloride) by blending with biodegradable polymer
    (Springer Science and Business Media Deutschland GmbH, 2023) Sudhakar, Y.N.; Muthu, M.; Bhat, D.K.
    Presently, society needs an eco-friendlier alternative for non-biodegradable polymers, nonetheless, synthetic polymers have established the market because of cost and easy to manufacture. To address the challenge of reducing the lifetime of degradation of these polymers, the scope of blending natural biopolymers is effective. This paper focuses on confirming the effectiveness of biodegradation in the molecular level of polymer blends between synthetic polymers and biopolymers. The synthetic polymers such as poly (methyl methacrylate) (PMMA) and poly (vinyl chloride) (PVC) were blended with varying compositions of biodegradable cellulose acetate butyrate (CAB). Using dimethylformamide (DMF) the films of PMMA/CAB, PVC/CAB blends were prepared by the solution casting method. Four different methods for studying biodegradability of these blends, namely soil burial test, enzymatic degradation, activated sludge degradation followed by microbial degradation were performed. The confirmation of degradation was done by NMR, FTIR, and Gel Permeation Chromatography (GPC) studies. Moreover, degradation analyses were determined by the weight loss method. Sufficient biodegradability was shown with an increase in CAB content in the blend. This work provides an approach for bringing about the degradation of synthetic polymers without much compromise on their properties. Also, the type of microorganisms that effectively degrades these polymer bends can be known. © 2022, The Author(s).
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    Enhanced flexibility and performance of interdigitated microsupercapacitors through in-situ rGO growth in NiCuSe nanocomposite conductive ink
    (Elsevier Ltd, 2025) Saquib, M.; Nayak, R.; Muthu, M.; Bhat, D.K.; Rout, C.S.
    Microsupercapacitors (MSCs) are promising alternative power sources capable of meeting the growing demand for wearable and on-chip electronics due to their compact size, lightweight nature, exceptional charge-discharge rates, high power densities, and superior flexibility. However, a major challenge in current MSCs development lies in their limited energy density, high-cost, and time-intensive fabrication processes. This study focuses on fabricating flexible interdigitated printed MSCs using in-situ growth of reduced graphene oxide within nickel-copper selenide nanocomposite inks via screen printing. The eco-friendly ink formulation incorporates ethyl cellulose, diacetone alcohol, and a non-ionic surfactant to optimize printability, viscosity, and post-drying efficacy. The MSCs achieved a high areal capacitance of 756.3 mFcm?2 at 5 mVs?1, with energy densities of 84.4 µWcm?2 (symmetric) and 151.2 µWhcm?2 (asymmetric), and corresponding power densities of 406 mW cm?² and 1210 mW cm?². The printed devices retained 94.2 % of their capacitance on PET (Polyethylene terephthalate) substrates and exhibited excellent mechanical stability under bending, making them ideal for wearable electronics and flexible IoT applications. These results highlight the potential of the fabricated screen-printed MSCs, leveraging the optimized electrode material, as a high-performance and eco-friendly energy storage technology for next-generation flexible electronics. © 2025 The Authors