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Adsorption of 2,4-dichlorophenol on metal-nitrate modified activated carbon
Kanagasabai Muruganandam Ponvel,Dhamodaran Kavitha,Kyung-Min Kim,이창하 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
To remove 2,4-dichlorophenol (2,4-DCP) from aqueous solution, the surface of the activated carbon was first treated with HCl and then the surface was modified by using various metal ions (Cu, Co, Fe, Ni, Zn, and Mg). Metal doping significantly enhanced the adsorption efficiency of activated carbon, an effect that was further increased by HCl treatment of the modified activated carbons. Of all the preparations, the zinc(Ⅱ)-modified activated carbon with HCl treatment showed the highest adsorption capacity for 2,4-DCP. Analysis of the zinc(Ⅱ)-modified activated carbon by SEM and BET showed a surface area and micropore volume of around 1,154.69 ㎡/g and 0.291 ㎤/g, respectively, values about 20% higher than in the starting material. In the pH range of 2.0-11.0, the maximum uptake of 2,4- DCP from an initial concentration of 1,000 mg/L was 508 mg/g at pH 4.0.
Immobilization of lipase on surface modified magnetic nanoparticles using alkyl benzenesulfonate
Kanagasabai Muruganandam Ponvel,Dong-Geun Lee,Eun-Ji Woo,안익성,이창하 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.1
The surface of nano-sized magnetite (NSM) particles synthesized by coprecipitation method was modified by alkyl benzenesulfonate (ABS) as a coating material. ABS on the NSM was expected to form a spacer between the surface of the NSM particles and the enzyme adsorbed and to play a role of strong enzyme adsorption onto a hydrophobic surface. Transmission electron microscopy showed that the NSM particles had an average size of 10 nm. Magnetic measurement revealed that the nanoparticles were superparamagnetic and the saturation magnetization was about 68 emu/g. Porcine pancreas lipase (PPL) was immobilized onto the ABS-NSM, which was to catalyze hydrolysis of olive oil and showed enhanced durability in the reuse after being recovered by magnetic separations.
Signal Integrity Analysis of High Speed Interconnects In PCB Embedded with EBG Structures
Sindhadevi, M.,Kanagasabai, Malathi,Arun, Henridass,Shrivastav, A. K. The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
This paper brings out a novel method for reducing Near end and Far end Crosstalk using Electromagnetic Band Gap structures (EBG) in High Speed RF transmission lines. This work becomes useful in high speed closely spaced Printed Circuit Board (PCB) traces connected to multi core processors. By using this method, reduction of −40dB in Near-End Crosstalk (NEXT) and −60 dB in Far End Crosstalk (FEXT) is achieved. The results are validated through experimental measurements. Time domain analysis is performed to validate the signal integrity property of coupled transmission lines.
Woo, EunJi,Ponvel, Kanagasabai Muruganandam,Ahn, Ik-Sung,Lee, Chang-Ha Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.8
<P>We synthesized magnetic/silica nanoparticles with a core/shell structure. The average diameter of the spherical particles was approximately 100 nm, and the average thickness of the silica shell was 20 nm. Due to the core of the magnetic clusters, the particles exhibited strong magnetization (21 emu/g). To immobilize His-tagged lipase, copper complexes with three different ligands were anchored to the surfaces of the particles. Up to 70% of the initial activity was obtained after three uses. Differences in the enzymatic activity and ligand-dependent reusability are discussed.</P> <P>Graphic Abstract</P><P>Magnetic/silica nanoparticles with high magnetization were prepared. Particles modified by organosilane ligands with copper complexes showed high activity and reuse efficiency of the lipases. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b918682d'> </P>
변상훈,Dhamodaran Kavitha,Kanagasabai Muruganandam Ponvel,Kyung-min Kim,이창하 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6
Coal-based granular activated carbon was modified with acetates of sodium, potassium and lithium at concentrations of 10 and 15% and used as adsorbents to explore the adsorption mechanism of nickel ion in aqueous solution. Acetate treatment reduced surface area and pore volume of the activated carbons, but the adsorption amount of Ni(Ⅱ) on the modified activated carbons (MAC) was greater than that on the virgin activated carbon. The adsorption depended on pH of the solution with an optimum at 4.5 and the adsorbed nickel could be fully desorbed by using 0.05 M HCl solution. The maximum adsorption capacity of nickel ion on Li (15 wt%) modified activated carbon was 151.3 mg/g and the adsorption isotherm follows Langmuir, Sips, and Redlich-Peterson isotherm models better than the Freundlich isotherm model. The kinetic data was better fitted by a non-linear form of the pseudo-first order than the pseudo-second order, but the difference between two kinetic models was small.
Signal Integrity Analysis of High Speed Interconnects In PCB Embedded with EBG Structures
M. Sindhadevi,Malathi Kanagasabai,Henridass Arun,A. K. Shrivastav 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
This paper brings out a novel method for reducing Near end and Far end Crosstalk using Electromagnetic Band Gap structures (EBG) in High Speed RF transmission lines. This work becomes useful in high speed closely spaced Printed Circuit Board (PCB) traces connected to multi core processors. By using this method, reduction of -40㏈ in Near-End Crosstalk (NEXT) and -60 ㏈ in Far End Crosstalk (FEXT) is achieved. The results are validated through experimental measurements. Time domain analysis is performed to validate the signal integrity property of coupled transmission lines.
Alagarsamy Karthik,Vishwakarma Vinita,Kaliaraj Gobi Saravanan,Kanagasabai Viswanathan,Ramasamy Sathiskumar 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.4
In this study, the diff erent weight percentages of ZrO 2 –Ag-reinforced HAp were prepared by the planetary mill and cal- cinated at 800 °C for 5 h. Synthesized nano-composites evolved the hexagonal phase of HAp in addition to ZrO 2 and Ag peaks. Raman spectroscopy confi rmed the high-intensity band of PO 4 −3 group and major bands of Zr and Ag. Staphylococ- cus epidermidis and Pseudomonas aeruginosa bacterial growth were arrested in HA20Zr10Ag nano-composites evaluated by in vitro antibacterial activity. Hemocompatible behavior of the reinforced HAp revealed that the nanocomposites was non-hemolytic with distinct RBC morphology and this eff ect was more pronounced while increasing ZrO 2 concentration. Biocompatibility studies, such as protein adsorption, cell viability, fl uorescence staining, mineralization, and quantifi cation of BMP-2, were analyzed with MG-63. The nanocomposites have adsorbed a high amount of proteins (~ 300 to 700 μg) from the serum. MTT assay revealed the percentage of the viability of the cells was ~ 70% to 80%. In vitro cytotoxic behavior of MG-63 cells illustrated that HA20Zr10Ag nanocomposites expressed polygonal structure with elongated morphology by Alexa Fluor 488 phalloidin and DAPI staining. Similarly, nano-composites powder proved its mineralization capability through intracellular calcium uptake up to the 5th day of MG-63 incubation. While, BMP-2 expression was slightly higher in HA20Zr10Ag nano-composite at 5th day of incubation. From the results, it is illustrated that HAp with 20 wt% of ZrO 2 and 10 wt% Ag nanocomposites has an important role in osteoblastic bone formation.
Sivakumar, T,Kumar, R Sambath,Perumal, P,Vamsi, MLM,Sivakumar, P,Kanagasabai, R,Baskaran, MV,Karki, Subhas S,Mazumder, UK,Gupta, M Kyung Hee Oriental Medicine Research Center 2005 Oriental pharmacy and experimental medicine Vol.5 No.4
The plant Bryonia laciniosa (Family: Cucurbitaceae) has been indicated for the treatment of various diseases one among which is cancer. The purpose of this study was investigating experimentally the possible anti-tumor effect and antioxidant role of Bryonia laciniosa leaves in animal model. The methanol extract of Bryonia laciniosa (MEBL) administered at the doses of 62.5, 125 and 250 mg/kg in mice for 14 days after 24 h of tumor inoculation. The effect of MEBL on the growth of transplantable murine tumor, life span of EAC bearing mice, hematological profile and liver biochemical parameters (lipid peroxidation, antioxidant enzymes) were estimated. Treatment with MEBL decreased the tumor volume and viable cell count thereby increasing the life span of EAC bearing mice and brought back the hematological parameter more or less normal level. The effect of MEBL also decreases the levels of lipid peroxidation and increased the levels of glutathione (GSH), superoxide dismutase (SOD) and catalase (CAT). The present work indicates that the methanol extract of Bryonia laciniosa exhibited significant antitumor and antioxidant activity in vivo.
Compact and Flexible Monopole Antenna for Ultra-Wideband Applications Deploying Fractal Geometry
Geetha G,Sandeep Kumar Palaniswamy,M. Gulam Nabi Alsath,Malathi Kanagasabai,T. Rama Rao 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.1
This paper presents a compact ultra-wideband (UWB) flexible monopole antenna design on a paper substrate. The proposed antenna is made of iterations of a circular slot inside an octagonal metallic patch. This fractal-based geometry has been deployed to achieve compactness along with improved bandwidth, measured reflection coefficient -10 ㏈ bandwidth ranging from 2.7 to 15.8 ㎓. The overall size of the antenna is 26 ㎜×19 ㎜×0.5 ㎜, which makes it a compact one. The substrate used is paper and the main features like environment friendly, flexibility, green electronics applications and low cost of fabrication are the key factors for the proposed antenna. The aforementioned UWB prototype is suitable for many wireless communication systems such as WiMAX, WiFi, RFID and WSN applications. Antenna has been tested for the effect of bending by placing it over a curved surface of a very small radius of 10 ㎜.