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( Ajay ),홍창국 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Here we propose a general approach for preparation of graphene-AESO polymer composite. By taking advantage of the unique amphiphilic structure of graphene oxide (GOSs), we developed a new polymer blend of acrylated epoxidized soybean oil (AESO) and graphene oxide via in situ polymerization. The composites were characterized by FTIR, 1H-NMR and Raman spectroscopy and XRD,SEM,TGA and DSC. This composite exhibits a percolation threshold of ~0.3 volume percent for room temperature electrical conductivity. Which is the lowest value of the percolation threshold than reported for other polymer carbon composites excepting for that of carbon nanotubes composites. Such low percolation value is sufficient for many electrical applications.
( Ajay ),홍창국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
In literature it was seen that natural properties of Elaiocarpus Ganitrus Roxb (Rudraksha) were studied extensively and no detail study was founded on magnetic properties of Rudraksha. Initial study showed that Rudraksha is highly magnetic as △W/M ㅁ 2 so in this work we have tried to apply TGA (Thermogravimetric Analysis) to prepare different magnetic material from Rudrakasha showed 9 plateaus in temperature range 303K to 773K. The IR study for compound obtained various plateaus confirmed that may were different compounds. When their magnetic properties study using Gouys Balance. It was observed that we can obtained magnetic material with high and low magnetic susceptibility.
( Ajay ),( Chang Kook Hong ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A green approach to produce bulk amount rGO using Graphene Oxide via Ball Milling in presence of Zinc. Furthermore, the extent of reduction of GO in the present strategy is much higher than that in the different approaches using metallic Zinc and NaOH, indicating a cooperativity between friction generated during milling and chemical reactions. To verify the applicability, we have examined the impact of rGO on the improvement of thermo-mechanical properties of Epoxy nanocomposites. Here, few layered rGO based Epoxy nanocomposites were obtained. Here rGO apparently filled in the interspaces of polymeric chains, which increments in thermo-mechanical properties of nanocomposites even with low loading of rGO.
( Ajay ),( Sawanta S. Mali ),홍창국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Graphite oxide and carbon black nanocomposites as bipolar plates for polymer electrolyte membrane fuel cells (PEMFCs) are developed by compression molding technique. It is found that composite bipolar plate with a varying weight percent of resin and GO gives the high electrical conductivity, competitive mechanical properties with increased bulk density and air tightness. The GO/CB-based composites with 40-45 wt % of resin are suitable for achieving desired properties of the bipolar plate as per the DOE advanced series target. The addition of 5 wt % of carbon black is helpful for improving the electrical conductivity without compromising other properties of the bipolar plate compared to graphite-resin-based composite plates.
( Ajay ),홍창국 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Stable dispersions of silane coupled graphene oxide in an acrylated epoxidized soy oil (AESO) based thermosetting resin were obtained by mechanical stirring. The thermo-mechanical properties of the polymerized samples measured by DMA. Which shows an improved storage modulus by ~30% for 0.5 wt % GO loading. Higher filler loadings resulted in significant aggregation during polymerization. Wide-angle X-ray scattering, optical microscopy, and transmission electron microscopy (TEM) demonstrated the formation of aggregates at higher filler loads, which reversed the potential for mechanical improvement. Whereas, TEM showed good intercalation of the polymer matrix with GO flexes which is improving much more properties collectively.
Ajay Kumar Sav,Ritesh Amol Fule,Meer Tarique Ali,Purnima Amin 한국약제학회 2013 Journal of Pharmaceutical Investigation Vol.43 No.5
In current study, fenugreek gum (FG) plant derived product was investigated as a release retarding polymer. The octenyl succincate anhydride derivative of fenugreek gum (OSFG) was synthesized to introduce hydrophobic property and investigated for its drug release retarding property with reference to FG. The reaction was carried out in anhydrous conditions at different temperature (40–98 C) using NaHCO3 as a mild base catalyst and the influences of three factors such as reagent/substrate concentration,reaction temperature and time on the degree of substitution of OSFG were studied. Highly water-soluble metoprolol succinate (MPS) and poorly water-soluble carbamazepine (CBZ) were selected as model drug as for release studies. It was observed that increase in reaction temperature and reagent concentration resulted in high degree of substitution with significant decrease in viscosity. Reaction carried out at 98 C for 2 h showed high degree of substitution (0.133) with moderate retention of viscosity compared to plain FG. FTIR, DSC, XRD, solid state CPMAS 13C-NMR, and SEM studies provide structural information of synthesized OSFG. MPS ER tablet prepared with drug:OSFG:FG at the weight of 1:4:2 and CBZ ER tablet with drug:OSFG at the weight ratio of 1:3, respectively. Both formulations showed similar drug release profile compared to marketed formulations. Optimized tablet formulations were found to be stable under stability condition according to ICH guidelines. It was concluded that the developed formulations with OSFG have a release retarding property and can be used alone or in combination with other polymers for a controlled release.
Ajay Kumar Sav,Meer Tarique Ali,Ritesh Amol Fule,Purnima Dhanraj Amin 한국약제학회 2013 Journal of Pharmaceutical Investigation Vol.43 No.5
In current study, highly purified fenugreek gum (HPFG) isolated by patented method explored as emulsifier and hydrophilic solid carrier in drug delivery system. Antihyperlipidemic drug simvastatin (SIM) was selected as drug model for the study as it is associated with poorly water solubility and low bioavailability problems (\5 %). A suitable HPFG-based silica lipid system composed of SIM (1.5 %), medium chain triglyceride Capmul MCM (10 %) as lipid phase, 0.6 % HPFG as emulsifier and HPFG 2.5 %, different grades colloidal silica (7.5 %)(Aerosil 300 Pharma, Aerosil 380 Pharma and Aeroperl 300 Pharma) as hydrophilic solid carriers was developed. The optimized HPFG-based silica lipid systems were characterized for physical characteristics like flow ability,compressibility, redispersiblity, solubility and in vitro drug release using USP apparatus II in pH 6.8 phosphate buffer. The system was also characterized for Fourier transform infrared spectroscopy, powder X-ray diffractometry (PXRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The developed formulation was found to have excellent flow property, readily redispersiblity, better aqueous solubility and showed 3–4-fold increase in dissolution rate as compared to plain drug and marketed formulation (Simlo 10). Transition of crystalline drug to amorphous state was confirmed by DSC,PXRD and SEM studies. Enhanced dissolution rate and solubility possibly attributed to improved wetting, amorphous drug state and facilitated diffusion from lipid-based system. Thus developed HPFG-based silica lipid system provides an alternative means for SIM with enhanced dissolution rate and stability in oral solid dosage form.
Analysis of frequency dispersion in amorphous In—Ga—Zn—O thin-film transistors
Ajay Bhoolokam,Manoj Nag,Adrian Chasin,Soeren Steudel,Jan Genoe,Gerwin Gelinck,Guido Groeseneken,Paul Heremans 한국정보디스플레이학회 2015 Journal of information display Vol.16 No.1
It is shown in this paper that the finite resistance of the accumulation channel in amorphous In–Ga–Zn–O thin-film transistors (a-IGZO TFTs) is the main cause of the frequency dispersion of the capacitance–voltage curves in these devices. A transmission line model, accounting for the distributed nature of channel resistance, is used to explain this. Multi-frequency analysis techniques for trap density distribution use a lumped series resistance model and attribute dispersion solely to the charging and discharging of trap states. As the resistance–capacitance (RC) time constant values of the IGZO TFTs are in the range of 10–100 μs, a distributed RC network is better suited for the measured frequency range (1 kHz–1 MHz).