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( Deonikar Virendrakumar Gorakhnath ),김헌 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Catalytic hydrolysis of chemical hydrides with the use of NaBH<sub>4</sub> is a safe and efficient way to provide hydrogen fuel for new energy vehicles and portable electronics devices. In this work we have prepared a series of Co<sub>1-x</sub>Cu<sub>x</sub>MoO<sub>4</sub> hybrids by hydrothermal method. The resultant hybrids were characterized to confirm the structural and physicalchemical properties by analytical techniques (FTIR, XRD, FE-SEM). Catalytic activity of Co<sub>1-x</sub>Cu<sub>x</sub>MoO<sub>4</sub> hybrids were investigated by hydrolysis of NaBH4. It is found that there is synergetic effect between CoMoO<sub>4</sub> and CuMoO<sub>4</sub>. Among those Co<sub>0.9</sub>Cu<sub>0.1</sub>MoO<sub>4</sub> shown highest catalytic activity of 301.72 H<sub>2</sub> g<sub>cat</sub><sup>-1</sup>min<sup>-1</sup> within 10 min. at room temperature. Additionally, Co<sub>0.9</sub>Cu<sub>0.1</sub>MoO<sub>4</sub> catalyst shown good recyclability making it a robust catalyst for hydrolysis of NaBH<sub>4</sub>.
Optimized properties and electrochromic performance of WO3 based nanohybrids
( Deonikar Virendrakumar Gorakhnath ),( John Marc C Puguan ),김헌 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Electrochromic (EC) smart window is a new technology that is capable of changing from transparent to opaque and has the potential in energy saving applications. In this work, we have prepared a series of WO3 based hybrids by different synthesis method. In EC smart windows, WO3 is the key element where it is responsible for the colouring and bleaching of the device. Therefore, the properties of WO3 with different dopants will affect the EC performance. In this work, WO3 films were deposited on tin doped indium oxide (ITO) coated glasses. The WO3 film thicknesses were varied by means of number of deposited layers. Their morphological, structural, optical and EC properties were characterised by FE-SEM, XRD, UV-Vis. spectra, (CV) and (CA) measurements, respectively.
Deonikar, Virendrakumar G.,Mujmule, Rajendra B.,Patil, Deepak R.,Kim, Hern Elsevier 2019 The Science of the total environment Vol.675 No.-
<P><B>Abstract</B></P> <P>With the aim to develop an eco-friendly, efficient and stable photocatalyst, the present work reports the synthesis of Ag<SUB>3</SUB>PO<SUB>4</SUB>/LaCO<SUB>3</SUB>OH (AP/LC) heterojunction photocatalysts. Different weight ratios of AP/(x wt% LC) were tested to find the best composition for superior photocatalytic activity for dye pollutant degradation. AP/LC (20 wt%) revealed a superior photocatalytic activity. Hence it was selected for further analyses. Furthermore, we investigated the influence of distilled water: tetrahydrofuran (DW:TF) solvent system on the morphology as well as photocatalytic activities of AP/LC (20%) heterojunction. FESEM analysis shows that the morphology of AP/LC heterojunctions varied significantly with TF:DW ratio. Sphere-shaped like nanoparticles of LC transformed into nanowires to make intimate contact with AP polyhedras. The increase of TF with respect to DW results increase in the width of wire-like dimension of LC causes loose intimate contact within AP/LC heterojunction. The photocatalytic performance of AP/LC heterojunctions were tested against degradation of toxic phenol contaminant, and the outstanding photocatalytic activity was noticed for the AP/LC-2 photocatalyst (~99% degradation in 120 min) with a rate constant, <I>k</I> of 1.281 × 10<SUP>−2</SUP> min<SUP>−1</SUP>. The improved photocatalytic performance can be attributed to the uniform decoration of LC nanowires on the AP microstructure which leads to intimate interface within the heterojunction and effective charge separation. The recyclability of the AP/LC-2 photocatalysts was evaluated via replicated photocatalytic reaction trials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A mixed solvent (DW:TF) varied strategy used to synthesize Ag<SUB>3</SUB>PO<SUB>4</SUB>/LaCO<SUB>3</SUB>OH (AP/LC) heterostructure photocatalysts. </LI> <LI> A tactic of mixed solvent system helped to tune the morphology, overall properties of AP/LC heterostructures. </LI> <LI> Spherical LC nanoparticles transformed into fine nanowires (in DW:TF=60:40 ratio) to make intimate contact with AP. </LI> <LI> Modified AP/LC heterostructure showed superior photocatalytic efficiency for phenol degradation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Deonikar Virendrakumar Gorakhnath ),김헌 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Present work reports the facile synthesis of Co1-xCuxMoO<sub>4</sub> hierarchical hybrids by hydrothermal method. The hybrids were characterized by various analytical techniques to confirm their structural and physical-chemical properties. With the increase in Cu ratio with respect to Co the morphology of these hierarchical hybrids varied significantly from irregular microsphere to marigold microspheres. Catalytic activity of hierarchical hybrids were investigated by hydrolysis of NaBH<sub>4</sub> and outstanding catalytic activity was found for marigold-like Co0.9Cu0.1 MoO<sub>4</sub> catalyst with a H<sub>2</sub> generation rate of 1005.7 ml H2·gcat-1 min-1. Also, catalysts mass loading, reusability tests were studied to confirm for their minimum catalyst loading and stability.
Virendrakumar Deonikar,김헌 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The current work demonstrates the preparation of in-situ polymerized polyurea microcapsules for reversible colour change and energy storage applications. For the fabrication of microcapsules, polyurea was used as a shell material and butyl stearate contained photochromic dye was used as a core material. The surface morphology, melt crystallization, thermal cycling durability, thermal stability and mechanical properties of the fabricated microcapsules were systematically investigated with field emission scanning electron microscope (FE-SEM), different scanning calorimetry (DSC), thermogravimetric (TG) and dynamic mechanical analysis (DMA). The results showed that the microcapsules synthesized with different lipophilic amines, had varied morphologies and particle size distribution. Finally, the reversible photochromic microcapsules also presented prominent light-to-thermal conversion properties. Furthermore, the temperature of the reversible photochromic microcapsules was observed.