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Mishra, D.K.,Dabbawala, A.A.,Park, J.J.,Jhung, S.H.,Hwang, J.S. Elsevier Science Publishers 2014 CATALYSIS TODAY - Vol.232 No.-
HY zeolite (HYZ) supported ruthenium (Ru) nanoparticles catalyst (Ru/HYZ) is prepared by simple impregnation method and is characterized by using energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), CO chemisorption and inductively coupled plasma (ICP) mass spectrometry. The catalyst Ru/HYZ is evaluated in hydrogenation of d-glucose and hydrogenation experiments to produce a selective product d-sorbitol were conducted batch wise in a three-phase laboratory scale reactor. The kinetics studies of d-glucose hydrogenation using the catalyst Ru/HYZ were carried out. In the operating regime studied the rate of reaction showed first orders dependency with respect to d-glucose and hydrogen. For affording maximum d-glucose conversion, yield and selectivity to d-sorbitol, the reaction conditions were also optimized.
Satyendra Mishra,Navinchandra G. Shimpi,Ananda D. Mali 한국고분자학회 2013 Macromolecular Research Vol.21 No.5
Basal spacing of montmorillonite (MMT) was improved through a column chromatography technique using quaternary long chain ammonium salt as an intercalent. An increase in d-spacing of organic montmorillonite (OMMT) was confirmed by XRD and found to increase from 16 to 22 Å. The d-spacing was maximum (22 Å) due to an ion exchange column of sufficient length (35 cm) and diameter (5 cm), which provides maximum retention time for the proper exchange of ions between plates of MMT and ion exchange resin packed into the column. Nanocomposites (OMMT: silicone rubber) were prepared using a solution blending method. The material was compounded on a two roll mill and molded in a compression molding machine in order to obtain a square (0.2 mm thickness) sheet. Photo-oxidative degradation of OMMT: silicone rubber composite was studied under accelerated UV irradiation (≥290 nm) at different time intervals. Prolonged exposure to UV leads to a progressive decrease in mechanical and physical properties along with the change in behavior of the filler-matrix interaction, which was due to decrease in cross-linkage density with an increase in the mobility of rubber chains. The increase in carbonyl (>CO), hydroxyl (-OH) functional groups on irradiation of OMMT: silicone rubber composites at different time intervals were studied using Fourier transform-infrared spectroscopy (FTIR). Whereas, change in morphological behavior regarding the OMMT-matrix interaction on irradiation was studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Overall, the study showed that the OMMT: silicone composites were affected more on irradiation than pristine silicone composites.
Satyendra Mishra,Navinchandra G. Shimpi,Ananda D. Mali 한국고분자학회 2012 Macromolecular Research Vol.20 No.1
Surface modification of montmorillonite (MMT) was done to improve the basal spacing using a column chromatography technique with quaternary long chain ammonium salt as an intercalent. An increase in d-spacing of organically modified montmorillonite (OMMT) was confirmed by X-ray diffraction and found to increase from 16 to 22 Å. The d-spacing was maximal (22 Å) due to ion exchange column of sufficient length (35cm) and diameter (5 cm), which provides maximum retention time for proper ion exchange between MMT and ion-exchange resin. OMMT: silicone nanocomposites were prepared by solution blending and then compounded and molded on two roll mill and compression molding machines, respectively. The amount of loading of OMMT was in the range of 2-10 wt%. The rubber chains were uniformly dispersed within and between the exfoliated OMMT plates. The extent of dispersion was measured using atomic force microscopy. The mechanical, thermal,and physical properties were studied. Increased amounts of OMMT loading showed increased silicone:OMMT nanocomposite properties compared to those of pristine silicone rubber due to OMMT exfoliation and uniform dispersion with good wet ability of the rubber chains.
Mishra, D.,Lee, H.,Kim, J.,Lee, H. S.,Cho, J.,Suh, Y. W.,Yi, Y.,Kim, Y. Royal Society of Chemistry 2017 GREEN CHEMISTRY Vol.19 No.7
<P>A new class of MnCo2O4 spinel supported Ru catalyst, Ru/MnCo2O4, was exploited to afford the highest yield of FDCA (99.1%) from base-free air-oxidation of HMF in water. The catalyst Ru/MnCo2O4 having both Lewis and Bronsted acidic active sites greatly enhanced the FDCA yield. The catalyst was recyclable up to five successive runs without considerable loss of its original activity.</P>
Mishra, Rohan,Kim, Young-Min,Salafranca, Juan,Kim, Seong Keun,Chang, Seo Hyoung,Bhattacharya, Anand,Fong, Dillon D.,Pennycook, Stephen J.,Pantelides, Sokrates T.,Borisevich, Albina Y. American Chemical Society 2014 NANO LETTERS Vol.14 No.5
<P>Complex oxides displaying ferroelectric and/or multiferroic behavior are of high fundamental and applied interest. In this work, we show that it is possible to achieve polar order in a superlattice made up of two nonpolar oxides by means of oxygen vacancy ordering. Using scanning transmission electron microscopy imaging, we show the polar displacement of magnetic Fe ions in a superlattice of (LaFeO<SUB>3</SUB>)<SUB>2</SUB>/(SrFeO<SUB>3</SUB>) grown on a SrTiO<SUB>3</SUB> substrate. Using density functional theory calculations, we systematically study the effect of epitaxial strain, octahedral rotations, and surface terminations in the superlattice and find them to have a negligible effect on the antipolar displacements of the Fe ions lying in between SrO and LaO layers of the superlattice (i.e., within La<SUB>0.5</SUB>Sr<SUB>0.5</SUB>FeO<SUB>3</SUB> unit cells). The introduction of oxygen vacancies, on the other hand, triggers a polar displacement of the Fe ions. We confirm this important result using electron energy loss spectroscopy, which shows partial oxygen vacancy ordering in the region where polar displacements are observed and an absence of vacancy ordering outside of that area.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-5/nl500601d/production/images/medium/nl-2014-00601d_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl500601d'>ACS Electronic Supporting Info</A></P>
Mishra, D.K.,Bejoy, N.,Sharon, Maheshwar. Korean Carbon Society 2005 Carbon Letters Vol.6 No.2
Taguchi methodology has been applied to get an idea about the parameters related to the chemical vapour deposition technique, which influences the formation of semiconducting carbon thin film of a desired band gap. L9 orthogonal array was used for this purpose. The analysis based on Taguchi methodology suggests that amongst the parameters selected, the temperature of pyrolysis significantly controls the magnitude of band gap (46%). Sintering time has a small influence (30%) on the band gap formation and other factors have almost no influence on the band gap formation. Moreover this analysis suggests that lower temperature of pyrolysis (${\leq}$ $750^{\circ}C$) and lower time of sintering (${\leq}$ 1 h) should be preferred to get carbon thin film with the desired band gap of 1.2eV.
Mishra, Prasheet,Lakshmi, D.V.N.,Sahu, D.K.,Das, Ratnakar The Institute of Internet 2015 International journal of advanced smart convergenc Vol.4 No.1
A novel process has successfully been developed by overcoming major difficulties through the elimination of number of process steps involved in the Classical Transesterification reaction during the preparation of Fatty Acid Methyl/Ethyl Ester (FAME.FAEE) called biodiesel. The Classical process with cost intensive process steps such as the utilization of excess alcohol, needing downstream distillation for the recovery and reutilization of excess alcohol/cosolvent, unrecoverable homogenous catalyst which consumes vast quantity of fresh distilled water during the purification of the product and downstream waste water treatment before its safe disposal to the surface water body. The Novel Process FAME/FAEE is produced from any vegetable oil irrespective of edible or inedible variety using sonication energy. The novelty of the finding is the use of only theoretical quantity of alcohol along with a co-solvent and reduced quantity of homogeneous catalyst. Under this condition neither the homogeneous catalyst goes to the FAME layer nor is the distillation needed. The same ester also has been prepared in high pressure high temperature reactor without using catalyst at sub critical temperature. The quality of prepared biodiesel without involving any purification step meets the ASTM standards. Blended Biodiesel with Common Diesel Fuel (CDF) and FAME is prepared, characterized and used as fuel in the Kirloskar make CI Engines. The evaluation of the engine performance result of pure CDF, B05 biodiesel, B10 biodiesel of all types of biodiesel prepared by using the feedstock of Soybean (Glycine max) and Karanja (Pongamia pinnate) oil along with their mixed oil provides useful information such as brake power, brake thermal efficiency, brake specific fuel consumption, etc, and established it as ideal fuel for unmodified CI engine.
D.K. Mishra,N. Bejoy,Maheshwar. Sharon 한국탄소학회 2005 Carbon Letters Vol.6 No.2
Taguchi methodology has been applied to get an idea about the parameters related to the chemical vapour deposition technique, which influences the formation of semiconducting carbon thin film of a desired band gap. L9 orthogonal array was used for this purpose. The analysis based on Taguchi methodology suggests that amongst the parameters selected, the temperature of pyrolysis significantly controls the magnitude of band gap (46%). Sintering time has a small influence (30%) on the band gap formation and other factors have almost no influence on the band gap formation. Moreover this analysis suggests that lower temperature of pyrolysis (≤ 750℃) and lower time of sintering (≤ 1 h) should be preferred to get carbon thin film with the desired band gap of 1.2eV.