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Nallasamy, Palanisami,Senthilkumar, Kabali,Mohan, Gopalakrishnan,Moon, IL-Shik Gordon and Breach Science Pub 2016 Journal of coordination chemistry Vol.69 No.6
<P>The structural characterization of tetranuclear cage-type cadmium(II) carboxy late [Cd-4(2-cpida)(2)(2,2'-bpy)(6)]center dot(2,2-bpy)center dot(ClO4)center dot 3H(2)O (1) (2-H(3)cpida = N-(2-carboxyphenyl) iminodiacetic acid, 2,2'-bpy = 2,2'-bipyridine) is described. H-bonding interactions between three lattice water molecules form a V-shaped trimer (H2O)(3), which is stabilized by 1. In addition, luminescence investigations revealed that 1 shows enhanced emissions as compared with free 2-H(3)cpida in the liquid state. [GRAPHICS] .</P>
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Nallasamy Palanisami,문일식,Sang Joon Chung 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
In this study, Ce(III)/Ce(IV) redox couple mediated electrochemical oxidation (MEO) process fordegradation of liquid 2,3,7,8-TCDD (tetrachloro dibenzo-p-dioxin) and PCDD/Fs (polychlorinateddibenzo-p-dioxins/dibenzofurans) from fly ash was developed. The highest concentration of Ce(IV) wasachieved under operation at 80 8C, current density of 10 A cm 2 with 0.9 M feed concentration of Ce(III)in atmospheric pressure. Both the liquid and fly ash samples reacted with electrogenerated Ce(IV) in 10 susing batch reactor and the obtained results were presented in the form of International Toxic Equivalentquantity (I-TEQ) and pg L 1. After reaction with Ce(IV), the concentration of the highly toxic liquidisomer 2,3,7,8-TCDD found 2.96 pg g 1 I-TEQ from the initial value of 1200 pg g 1 I-TEQ that is equal tothe removal efficiency of 99.75%. HRMS data demonstrated the fly ash, the total PCDD/Fs concentrations,decreased to 33.16 pg g 1 I-TEQ from the initial value of 58 pg g 1 I-TEQ, which is equal to removalefficiency of 42.8%. The developed Ce(III)/Ce(IV) MEO process provides potential removal of PCDD/Fs inshort time from the emissions of industrial waste incinerators.
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Nallasamy Palanisami,문일식,Ke He 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
Membrane distillation (MD), a non-isothermal membrane separation process, is based on the phenomenon that pure water in its vapor state can be extracted from aqueous solutions by passing vapor through a hydrophobic microporous membrane when a temperature difference is established across it. We used three commercially available hydrophobic microporous membranes (C02, C07 and C12; based on the pore size 0.2, 0.7 and 1.2 μm respectively)for desalination via direct contact MD (DCMD). The effects of operating parameters on permeation flux were studied. In addition, the desalination of seawater by solar assisted DCMD process was experimentally investigated. First, using solar power only short-term (one day), successful desalination of real seawater was achieved without temperature control under the following conditions: feed inlet temperature 65.0 oC, permeate inlet temperature 25.0 oC, and a flow rate of 2.5 L/min. The developed system also worked well in the long-term (150 days) for seawater desalination using both solar and electric power. Long-term test flux was reduced from 28.48 to only 26.50 L/m2hr, indicating system feasibility.
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Govindan, M.,Karunakaran, K.,Nallasamy, P.,Moon, I.S. Pergamon Press ; Elsevier Science Ltd 2015 Talanta Vol.132 No.-
This work describes the quantitative analysis of (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB> and NH<SUB>4</SUB>HCO<SUB>3</SUB> using a simple solution phase titration method. Back titration results at various (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB>-NH<SUB>4</SUB>HCO<SUB>3</SUB> ratios demonstrated that 6:4 ratio caused a 3% error in their differentiation, but very high errors were found at other ratios. A similar trend was observed for the double indicator method, especially when strong acid HCl was used as a titrant, where still less errors (2.5%) at a middle ratio of (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB>-NH<SUB>4</SUB>HCO<SUB>3</SUB> was found. Remaining ratios with low (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB> (2:8, 4:6) show high +ve error (found concentration is less) and high (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB> (7:3, 8:2, and 9:1) show high -ve error (found concentration is higher) and vice versa for NH<SUB>4</SUB>HCO<SUB>3</SUB>. In replacement titration using Na<SUB>2</SUB>SO<SUB>4</SUB>, at both higher end ratios of (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB>-NH<SUB>4</SUB>HCO<SUB>3</SUB> (2:8 and 9:1), both -ve and +ve errors were minimized to 75% by partial equilibrium arrest between (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB> and NH<SUB>2</SUB>COONH<SUB>4</SUB>, instead of more than 100% observed in back titration and only double indicator methods. In the presence of (NH<SUB>4</SUB>)<SUB>2</SUB>SO<SUB>4</SUB> both -ve and +ve error% are completely reduced to 3+/-1 at ratios 2:8, 4:6, and 6:4 of (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB>-NH<SUB>4</SUB>HCO<SUB>3</SUB>, which demonstrates that the equilibrium transformation between NH<SUB>2</SUB>COONH<SUB>4</SUB> and (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB> is completely controlled. The titration conducted at lower temperature (5<SUP>o</SUP>C) in the presence of (NH<SUB>4</SUB>)<SUB>2</SUB>SO<SUB>4</SUB> at higher ratios of (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB>-NH<SUB>4</SUB>HCO<SUB>3</SUB> (7:3, 8:2,and 9:1) shows complete minimization of both -ve and +ve errors to 2+/-1%, which explains the complete arresting of equilibrium transformation. Finally, the developed method shows 2+/-1% error in differentiation of CO<SUB>3</SUB><SUP>2-</SUP> and HCO<SUB>3</SUB><SUP>-</SUP> in the regeneration process of NaHCO<SUB>3</SUB> from crude desulfurized sample. The developed method is more promising to differentiate CO<SUB>3</SUB><SUP>2-</SUP> and HCO<SUB>3</SUB><SUP>-</SUP> in industrial applications.
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Effect of Collector Temperature on the Porous Structure of Electrospun Fibers
Kim Chi Hun,Jung Yoon Ho,Kim Hak Yong,Lee Douk Rae,Dharmaraj Nallasamy,Choi Kyung Eun The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.1
We report a new approach to fabricate electrospun polymer nonwoven mats with porous surface morphology by varying the collector temperature during electrospinning. Polymers such as poly(L-lactide) (PLLA), polystyrene (PS), and poly(vinyl acetate) (PVAc) were dissolved in volatile solvents, namely methylene chloride (Me) and tetrahydrofuran (THF), and subjected to electrospinning. The temperature of the collector in the electrospinning device was varied by a heating system. The resulting nonwoven mats were characterized by using scanning electron microscopy (SEM), field emission SEM (FESEM), and atomic force microscopy (AFM). We observed that the surface morphology, porous structure, and the properties such as pore size, depth, shape, and distribution of the nonwoven mats were greatly influenced by the collector temperature.
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