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Electroactive and Optically Adaptive Bionanocomposite for Reconfigurable Microlens
Sadasivuni, Kishor Kumar,Ponnamma, Deepalekshmi,Ko, Hyun-U,Zhai, Lindong,Kim, Hyun-Chan,Kim, Jaehwan American Chemical Society 2016 The Journal of physical chemistry B Vol.120 No.20
<P>This paper introduces an electroactive bionanocomposite based on poly(diethylene glycol adipate) (PDEGA) and cellulose nanocrystals (CNCs). The bionanocomposites were made using CNCs extracted from cotton and by optimizing its concentration in terms of the optical transmittance and viscosity. The characteristic properties of the materials were analyzed using contact angle measurements and Fourier transformation infrared spectra. Using the PDEGA/CNC bionanocomposite at a very low concentration of CNCs, a configurable lens having a robust, self-contained tunable optical structure was developed. The shape and curvature of the soft PDEGA/CNC device were controlled by applying voltage, and the focal length was measured. The simple structure, high optical transparency, biodegradability, thermal stability, high durability, and low power consumption make the new material particularly useful in fabricating a reconfigurable lens for future electronic and optical devices.</P>
Flexible NO<sub>2</sub> sensors from renewable cellulose nanocrystals/iron oxide composites
Sadasivuni, K.K.,Ponnamma, D.,Ko, H.U.,Kim, H.C.,Zhai, L.,Kim, J. Elsevier Sequoia 2016 Sensors and actuators. B Chemical Vol.233 No.-
A bio-friendly nanostructured cellulose nanocrystal (CNC) sheet with iron oxide grown on it acting as a nitrogen dioxide (NO<SUB>2</SUB>) gas sensor was fabricated by hydrothermal method. The structural investigation was done to monitor the growing mechanism of iron oxide on CNC surface using electron microscope as well as physical and chemical characterization methods. The sensing performance test for NO<SUB>2</SUB> molecules demonstrates that the devices are highly sensitive and fully recoverable at room temperature, which is attributed to the excellent access of nitrogen dioxide molecules to the sensor surface via CNC. The effects of the temperature, durability, and flexibility of sensor are investigated. The reported sensor performance is a huge improvement towards low power consumption and its room temperature operation augurs well for use in various applications.
Kafy, Abdullahil,Sadasivuni, Kishor Kumar,Kim, Hyun-Chan,Akther, Asma,Kim, Jaehwan The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.8
<P>The demand for flexible energy storage devices is ever increasing, and several polymer nanocomposites are widely used to fabricate them. Here, we present a cellulose based nanocomposite by incorporating graphene oxide (GO) nanoplatelets modified with hexamethylene diisocyanate grafting agent useful for such versatile applications. The simple method of casting/solvent evaporation is applied to prepare the nanocomposites and GO dispersion in the cellulose matrix was analyzed by Fourier transform infrared spectroscopy, X-ray diffraction studies and scanning electron microscopy. The dielectric and ferroelectric properties of the eco-friendly samples were checked with temperature and voltage variations, which can attribute to flexible energy and memory storage properties. Thus, the cellulose modified GO nanocomposite has turned to be environmentally stable and excellent next generation material for energy storage and electronic devices.</P> <P>Graphic Abstract</P><P>The demand for flexible energy storage devices is ever increasing, and several polymer nanocomposites are widely used to fabricate them. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp05921b'> </P>
Dayakar, T.,Venkateswara Rao, K.,Park, Jinsub,Sadasivuni, Kishor Kumar,Ramachandra Rao, K.,Jaya rambabu, N. Elsevier 2018 Materials chemistry and physics Vol.216 No.-
<P><B>Abstract</B></P> <P>An enzyme-free glucose sensor developed based on silver nanoparticles (Ag NPs) via bio-mediated route using <I>Ocimum tenuiflorum</I> leaves extract. The Ag NPs were characterized by X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Particle size analyzer (PSA), Scanning electron microscopy (SEM), Energy-dispersive X-ray (EDAX) spectroscopy, and Transmission electron microscopy (TEM), to study structural, optical and morphological properties. The electrocatalytic activity of Ag NPs towards the oxidation of glucose in the 0.1 M NaOH electrolyte solution was analyzed. The Ag NPs was coated on Glassy carbon electrode (GCE) and reports indicating the outstanding capability such as high sensitivity (895.8 μAmM<SUP>−1</SUP>cm<SUP>−2</SUP>), linear range (1–8.9 mM), response time (<4s), low detection limit (0.0048 μM, S/N = 3), long-term stability, reproducibility, repeatability, and selectivity of the sensor. Therefore, the bio-synthesized Ag NPs can markedly helpful to fabricate non-enzymatic, sustainable, simple, low cost, and eco-friendly glucose monitoring devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ocimum tenuiflorum leaf extract and silver nitrate were used to prepare Ag NPs. </LI> <LI> Structural, optical and morphological properties of Ag NPs were studied. </LI> <LI> The GCE modified with Ag NPs showed a sensitivity of 895.8 μAmM<SUP>−1</SUP>cm<SUP>−2</SUP>. </LI> <LI> Bio-mediated synthesized NPs showed sustainable glucose sensing properties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Latthe, Sanjay S.,Sutar, Rajaram S.,Bhosale, Appasaheb K.,Nagappan, Saravanan,Ha, Chang-Sik,Sadasivuni, Kishor Kumar,Liu, Shanhu,Xing, Ruimin Elsevier 2019 Progress in organic coatings Vol.137 No.-
<P><B>Abstract</B></P> <P>Anti-icing coating is one of the recent hot topics in industrial applications as well as from the academic viewpoint. Icing is one of the major problem on various substrates such as glass windows in buildings as well as vehicles, solar panels, wind turbine blades, airplanes, transmission lines, power towers, traffic signals, off-shore oil platforms, telecommunication antennas, and many others. Ice accumulation can significantly reduce the performance of the substrates and results in poor visibility. Recently, considerable attention is being paid on the naturally inspired superhydrophobic/icephobic surfaces by mimicking its surface property for the development of artificial self-cleaning superhydrophobic and ice-phobic surfaces. A good example is the lotus leaf surface where hierarchical micro and nano-scale rough structure covered by low surface energy coating layer on the leaf can repel water droplets and prevent ice accumulation. On superhydrophobic surfaces, impacting and condensed water droplets rolled off before freezing at subzero temperature. On the other hand, in slippery liquid-infused porous surface (SLIPS), the air pockets are replaced by immiscible lubricant film which can easily remove the accumulated ice without any damage to the surface. In this review article, we describe the recent progress in passive anti-icing coating materials and methodologies. Metal substrates, polymers, and nanoparticles/polymer composites are playing the major role in the development of anti-icing surface. So, the main goal of this review articles deals with the development of various synthetic routes of superhydrophobic anti-icing coating materials from metal substrates, polymers, and nanoparticles/polymer composites. In addition, the role of SLIPS in anti-icing coating and their use are also discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This review article explores the recent developments done in fabricating the anti-icing surfaces. </LI> <LI> Various new ideas, materials, fabrication techniques and prospects are thoroughly discussed. </LI> <LI> The merit/demerits of various anti-icing surfaces were identified and discussed. </LI> <LI> This review article is beneficial for graduate, post-graduate students and experts in this research field. </LI> </UL> </P>