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Elineema, G.,Kim, J.K.,Hilonga, A.,Shao, G.N.,Kim, Y.N.,Quang, D.V.,Sarawade, P.B.,Kim, H.T. Korean Society of Industrial and Engineering Chemi 2013 Journal of industrial and engineering chemistry Vol.19 No.1
This study reports on the quantitative recovery of high purity nanoporous silica from wastes material (H<SUB>2</SUB>SiF<SUB>6</SUB>) of the phosphate fertilizer industry and Na<SUB>2</SUB>O.SiO<SUB>2</SUB>. The silica recovered from the wastes was compared with silica from the reaction of H<SUB>2</SUB>SO<SUB>4</SUB> and Na<SUB>2</SUB>O.SiO<SUB>2</SUB> because H<SUB>2</SUB>SO<SUB>4</SUB> is commonly used. The product recovered from the wastes material and H<SUB>2</SUB>SO<SUB>4</SUB> were 99.3% and 99.1% pure, respectively. The quantity recovered were 22.30g and 20.11g, respectively. The product had superior properties suitable for applications such as chromatography, reinforcing material for rubber and plastics. The process may significantly reduce the release of SiF<SUB>4</SUB> gas into the environment.
Magneto-transport properties of magnetic tunnelling transistors at low and room temperatures
Quang, H D,Huu, C X,Oh, S K,Dang, V S,Sinh, N H,Yu, S C IOP Pub 2006 Nanotechnology Vol.17 No.14
<P>Si(100)/CoFe/AlO<SUB><I>x</I></SUB><I>/</I>CoFe/FeMn/Cu/Ta magnetic tunnelling transistors (MTTs) with differing base thicknesses (<I>W</I>) were investigated. The magneto-transport properties of the MTTs were measured at 77?K and room temperature (RT). We obtained magneto-current ratios of 48.3% and 55.9% for emitter–base bias voltages of 1.45 and 2.0?V, respectively, at 77?K. The transfer ratios are 2.83 ? 10<SUP>−5</SUP> and 1.52 ? 10<SUP>−4</SUP>, respectively, corresponding to bias voltages of 1.45 and 2.0?V. Moreover, the highest tunnel magneto-resistance (TMR) ratios turned out to be 12% and 20% for a base thickness of 30?Šat RT and 77?K, respectively. These properties raise not only some fundamental questions regarding the phenomenon of spin-independent tunnelling at low and room temperatures, but also show some promising aspect for magneto-electronic applications. In addition, we attempted to elucidate the reason behind the outstanding TMR effect at low and room temperatures. Finally, the origin of the decrease in the mean free path asymmetry (<img SRC='http://ej.iop.org/images/0957-4484/17/14/004/nano218705ieqn1.gif' ALIGN='MIDDLE' ALT='\lambda^{ \uparrow }/\lambda^{\downarrow } '/>) was clarified by using x-ray photoelectron spectroscopy profile analysis of the elements existing in the interface between Si and the CoFe base (Co, Fe, Al, Si, O). </P>
Preparation of amino-functionalized silica for copper removal from an aqueous solution
Quang, D.V.,Kim, J.K.,Sarawade, P.B.,Tuan, D.H.,Kim, H.T. Korean Society of Industrial and Engineering Chemi 2012 Journal of industrial and engineering chemistry Vol.18 No.1
In the present research, amino-functionalized silica materials were synthesized to develop absorbents for removing copper (II) ions from water. Three kinds of silica with various BET surface areas and pore volumes (331.4m<SUP>2</SUP>/g, 460.1m<SUP>2</SUP>/g, 717.7m<SUP>2</SUP>/g and 1.38cm<SUP>3</SUP>/g, 1.06cm<SUP>3</SUP>/g, 0.57cm<SUP>3</SUP>/g, respectively) were used to determine an optimum material. 3-Aminopropyltrimethoxysilane (3-APTMS) and N-[3-(trimethoxysilyl)propyl]-ethylenediamine (MSDA) are two amino-functional moieties grafted onto silica surfaces. A maximum copper absorption of 33.45mg/g was confirmed using the amino-functionalized material at an initial 3-APTMS concentration of 2.52mmol/g. Silica with a BET surface of 331m<SUP>2</SUP>/g and a pore volume of 1.38cm<SUP>3</SUP>/g demonstrated a good copper absorption capacity. Interference species such as pH, NH<SUB>3</SUB> and EDTA were also studied in this work.
Improvement of soft clay at a site in the Mekong Delta by vacuum preloading
Quang, N.D.,Giao, P.H. Techno-Press 2014 Geomechanics & engineering Vol.6 No.5
Soil improvement by preloading with PVD in combination with vacuum is helpful when a considerable load is required to meet the desired rate of settlement in a relative short time. To facilitate the vacuum propagation, vertical drains are usually employed in conjunction. This ground improvement method is more and more applied in the Mekong delta of Vietnam to meet the needs of fast infrastructure development. This paper reports on a pilot test that was carried out to investigate the effect of ground improvement by vacuum and PVD on the rate of consolidation at the site of Saigon International Terminals Vietnam (SITV) in Ba Ria-Vung Tau Province, Viet Nam. Three main aspects of the test will be presented, and namely, instrumentation and field monitoring program, calculation of consolidation settlement and back-analysis of soil properties to see the difference before and after ground improvement.
Kim, D.C.,Quang, T.H.,Yoon, C.S.,Ngan, N.T.T.,Lim, S.I.,Lee, S.Y.,Kim, Y.C.,Oh, H. Applied Science Publishers 2016 Food chemistry Vol.213 No.-
Kanjang (Korean soy sauce) is a byproduct of the production of the Korean fermented soybean. In the present study, seven indole alkaloid derivatives were isolated from methanol extract of kanjang. Their structures were identified as 1-propyl-1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid (1), 1-methyl-1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid (2), 1-methyl-1,2,3,4-tetrahydro-β-carboline-1-carboxylic acid (3), 3-indoleacetic acid (4), N<SUB>b</SUB>-acetyltryptamine (5), 1-methyl-3,4-dihydro-β-carboline (6), and flazine (7) by NMR and MS analyses. Preliminary screening for anti-neuroinflammatory effects of isolated indole alkaloids in lipopolysaccharide (LPS)-stimulated BV2 cells revealed that these compounds inhibited the production of nitric oxide and prostaglandin E<SUB>2</SUB>. For the subsequent investigation of anti-neuroinflammatory action of these metabolites, compounds 4 and 7 were selected, and the results revealed that these inhibitory effects correlated with the suppressive effect of 4 and 7 on inducible nitric oxide synthase and cyclooxygenase-2 expression in LPS-stimulated BV2 cells. In regards to the mechanism of the anti-inflammatory effect, 4 and 7 significantly inhibited the nuclear factor-kappa B pathway.