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RISS 인기검색어
- 검색키워드
- 저자 : Navinchandra G. Shimpi (검색결과 4 건)
- 무료
- 기관 내 무료
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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.
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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.
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Minakshi Jha,Shabnam Ansari,Navinchandra G. Shimpi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
Ag:CdO nanocubes and nanosphere were synthesised via ultrasonic assisted green approach using Citrus limon leaves and applied for photodegradation. Nanocubes and nanosphere morphology were evident from SEM and TEM. The degradation time and apparent rate constant (from pseudo-first-order) for (2%) Ag:CdO@MB, (2%) Ag:CdO@Rh-B, (5%) Ag:CdO@MB and (5%) Ag:CdO@Rh-B system were t = 33 min (K = 0.088 min−1), t = 42 min (K = 0.032 min−1), t = 18 min (K = 0.11 min−1), t = 24 min (K = 0.0759 min−1), respectively. (5%) Ag:CdO conserve 92% of its activity after five repeated cycle. Generation of HO and O2− radicals lead photodegradation. Photocatalytic mechanism was elucidated and degradation pattern followed pseudo-first order kinetics.
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High performance visible light photocatalysis of electrospun PAN/ZnO hybrid nanofibers
Akshara P. Shah,Shilpa Jain,Vinod J. Mokale,Navinchandra G. Shimpi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
ZnO nanorods (NRs) immobilized PAN nanofibers were prepared using electrospinning technique. ZnOwere dispersed uniformly, which helps to overcome the difficult recycling of powder catalyst. The asobtainedfibers were characterized with wide-angle powder X-ray diffraction (XRD), scanning electronmicroscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy(FTIR), UV-vis diffuse reflectance spectrophotometry (UV-vis-DRS), Thermogravimetry analysis (TGA), N2adsorption–desorption isotherms (BET), and X-ray photoelectron spectrometer (XPS). The morphologicalstudies revealed that ZnO NRs were aligned parallel to the axis offibers. PAN/ZnO hybrid NFs showsbetter regularity and uniformity in diameter (~800 nm) with large specific surface area and smaller energyband gap comparted to ZnO NRs. Under visible light irradiation, PAN/ZnO hybrid nanofibers have hadexcellent photocatalytic performances for the degradation of cationic MG dye (200 min, 99%) and anionicMO dye (280 min, 99%) respectively. Due to the electrostatic attraction between cationic dye and anionicPAN/ZnO, the degradation rate towards MG dye was higher than MO dye. Recyclability study shows thatafterfifth cycle, 93% efficiency was observed.
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