http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ragupathy, Dhanusuraman,Gopalan, Anantha Iyengar,Lee, Kwang-Pill The Korean Society of Analytical Sciences 2008 분석과학 Vol.21 No.1
Organic disulfide compounds are having higher theoretical capacity than the conventional cathode material and are considered as the important storage material. Here, we are reporting the preparation of poly (2,2'-dithiodianiline) PDDA/multiwall carbon nanotubes, (MWCNTs) composites under different experimental conditions. Amine functionalized and unfunctionalized MWCNTs were independently used for the preparation of composites. Composites were prepared in the presence of cetyl trimethyl bromide (CTAB), a cationic surfactant, and also in the absence of CTAB. A physical mixture of PDTDA and MWCNTs was formed with unfunctionalized MWCNTs. Grafting of PDDA onto MWCNTs was performed by chemical oxidative polymerization of 2, 2'-dithiodianiline in the presence of amine functionalized MWCNTs. The composites of MWCNTs and PDTDA were characterized for structure, morphology and thermal properties through Fourier transform infrared spectroscopy, Fourier transform Raman spectroscopy, scanning electron microscopy and UV-visible spectroscopy. The composite materials prepared by this method are expected to find applications as electrode materials for lithium batteries.
Dhanusuraman Ragupathy,Palanisamy Gomathi,이수출,Salem S. Al-Deyab,이상학,김한도 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
A simple, rapid and efficient route to prepare polyaniline nanostructures (PANI-NS) by ‘‘one-step chemical oxidative polymerization’’ method is described. This method possesses advantages in terms of good yield, short reaction time, neat conditions and cost-effectiveness. The morphology of the PANI-NS was investigated by field-emission scanning electron microscopy (FE-SEM). The average diameter of single PANI-NS was calculated to be 376 nm. Results from UV–visible spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis and cyclic voltammetry (CV) reveals the existence of PANI units present in the polymeric nanostructures. Also, electrical conducting property of the PANI-NS was analyzed using four-probe measurement method.
Self-Assembly Growth of Electrically Conductive Chitosan Nanofibrous Scaffold
Dhanusuraman Ragupathy,김한도,Palanisamy Gomathi,Loganathan Kumaresan,이수출,Salem S. Al-Deyab,이상학 한국고분자학회 2012 Macromolecular Research Vol.20 No.10
We report on the synthesis of an electrically conductive chitosan nanofibrous scaffold (NFS) by a “simple template free self-assembly method’’ from biopolymer chitosan in the presence of inorganic acids as dopants and ammonium persulphate (APS) as an initiator. The morphology of the chitosan nanofibers scaffold (CS-NFS) was examined by field emission scanning electron microscopy (FE-SEM). Physiochemical characterizations of the CSNFS were analyzed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis. It is found that the morphology and structure of the CS-NFS strongly depend on the kinds of dopant used. Cyclic voltammogram measurement reveals that CS nanofibers have high electrocatalytic activity compared to chitosan powder. The CS nanofibers are expected to be useful in electrical, optical, and electrochemical devices.
Dhanusuraman Ragupathy,박정제,이수출,김재창,김민관,이소민,김한도,Annamalai Rajendran,이상학,전경문 한국고분자학회 2011 Macromolecular Research Vol.19 No.8
A modified electrode was fabricated by grafting poly(2,5-dimethoxyaniline) (PDMA) onto multiwalled carbon nanotubes (MWNTs) and used for the electrocatalytic oxidation of ascorbic acid (AA). Cyclic voltammetry was used to fabricate the modified electrode and demonstrate the electroactivity of MWNT-g-PDMA-ME towards AA. Field emission scanning electron microscopy (FESEM) of MWNT-g-PDMA-ME revealed the combined presence of MWNT and PDMA. The MWNT-g-PDMA-ME exhibited excellent performance for AA at 320 mV with a high sensitivity (12.78 μA/mM) and linear concentration range of 1 to 5 mM (correlation coefficient of 0.9991). Differential pulse voltammetry (DPVs) showed that MWNT-g-PDMA-ME experiences negligible interference from other electro-active components.
D. Ragupathy,이수출,Salem S Al-Deyab,A. Rajendren 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
We report for the first time a rapid electrochemical synthesis of one-dimensional poly(2,5-dimethoxyaniline) nanorods (PDMA-NR) in the presence of surfactant. FE-SEM and TEM imagesconfirm the PDMA-NR formation and the average diameter of single rod sizes in the range of ~200–300 nm. An enzymatic glucose biosensor was fabricated through immobilizing glucose oxidase (GOx)into PDMA-NR matrix. The amperometric current response of PDMA-NR/GOx to glucose is linear in theconcentration range between 1 and 10 mM with a detection limit of 0.5 mM (S/N = 3). The PDMA-NR/GOxelectrode possesses high sensitivity (5.03 mA/mM), selectivity, stability, and reproducibility towardglucose.
Simple and rapid synthesis of polyaniline microrods and its electrical properties
D. Ragupathy,이수출,Salem S Al-Deyab,A. Rajendran 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
We report a facile and surfactant assisted synthesis of polyaniline microrods (PANI-MR) by ‘‘single-step chemical oxidative polymerization’’ method. The morphology of the PANI-MR was investigated by fieldemission scanning electron microscopy (FE-SEM). The average diameter of single PANI-MR was calculated to be 1.3 mm. The physiochemical characterization was examined using UV–visible spectroscopy, Fourier transform infrared spectroscopy and cyclic voltammetry. The electrical conducting property of the PANI-MR was analyzed using four-probe measurement method.
Dhanusuraman Ragupathy,Anantha Iyengar,이광필 한국분석과학회 2008 분석과학 Vol.21 No.1
Organic disulfide compounds are having higher theoretical capacity than the conventional cathodematerial and are considered as the important storage material. Here, we are reporting the preparation of poly(2,2'-dithiodianiline) PDDA/multiwall carbon nanotubes, (MWCNTs) composites under different experimentalof composites. Composites were prepared in the presence of cetyl trimethyl bromide (CTAB), a cationicsurfactant, and also in the absence of CTAB. A physical mixture of PDTDA and MWCNTs was formed withunfunctionalized MWCNTs. Grafting of PDDA onto MWCNTs was performed by chemical oxidative polymerizationof 2, 2-dithiodianiline in the presence of amine functionalized MWCNTs. The composites of MWCNTs andPDTDA were characterized for structure, morphology anspectroscopy, Fourier transform Raman spectroscopy, scanning electron microscopy and UV-visible spectroscopy.The composite materials prepared by this method are expected to find applications as electrode materials forlithium batteries.
Ramkumar Ramakrishnan,Ragupathy Arumugam 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"Optimization of cold water temperature in forced draft cooling tower with various operating parameters has been considered in the present work. In this study, response surface method (RSM) and an artificial neural network (ANN) were developed to predict cold water temperature in forced draft cooling tower. In the development of predictive models, water flow, air flow, water temperature and packing height were considered as model variables. For this propose, an experiment based on statistical five-level four factorial design of experiments method was carried out in the forced draft cooling tower. Based on statistical analysis, packing height, air flow and water flow were high significant effects on cold water temperature, with very low probability values (< 0.0001). The optimum operating parameters were predicted using RSM, ANN model and confirmed through experiments. The result demonstrated that minimum cold water temperature was optioned from the ANN model compared with RSM."