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Home > Papers > Analytical-Chemistry

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	1. New study on direct detection of trace copper in the presence of ionic surfactant
	Gong Shuguo,Xia Jianjun,Wei Wanzhi,Jian Yin,Zeng Jinxiang ,Liu Xiaoying ,Zhai Xiurong
	Chemistry 29 November 2005
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	Abstract:A new method for the direct detection of trace copper in the presence of ionic surfactant was developed, based on the response of differential pulse anodic stripping voltammetry at a gold electrode modified with self-assembled monolayer of 2-mercaptobenzimidazole(MBI).Experimental results indicated that MBI monolayer could prevent electrode surface fouling by ionic surfactant and that after preconcentration, copper down to 0.01 mmol l-1 in the presence of 0.5 mg ml-1 hexadecyl trimethyl ammonium bromide could be detected. The features of the new method were to be simple, sensitive and low-cost.
	TO cite this article:Gong Shuguo,Xia Jianjun,Wei Wanzhi, et al. New study on direct detection of trace copper in the presence of ionic surfactant [OL].[29 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3868


	2. O-floating adn O-diffusing at metal surfaces
	SUn Changqing
	Chemistry 08 September 2005
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	Abstract:The obsercved O-floating or diffusing at metal surfaces are attributed to the processed of tetrahedron bond switching under a certain conditions.
	TO cite this article:SUn Changqing. O-floating adn O-diffusing at metal surfaces[OL].[ 8 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2824

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	3. VLEED sensitivity ot bond geometry and potential parameters
	Sun Changqing
	Chemistry 07 September 2005
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	Abstract:The critical examination of the spectral sensitivity to the Cu(001)-O surface provides evidence for that the VLEED are highly more sensitive to the bonding geometry than individual atomic-shift. The shapes of the fine-structure features are dominated by the elastic potential that determines thephase change of the diffracted beams. The inelastic potential influences on the absolute intensity other than the shape of the I-V curve. It is justified that the inelastic damping is predominated by the outermost layer. Therefore the VLEED is such a technique that it is able to reveal nondestructive information from the overlayer integrating the bond forming and the behaviour of surface electrons.
	TO cite this article:Sun Changqing. VLEED sensitivity ot bond geometry and potential parameters[OL].[ 7 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2819


	4. Cu3O2 pairing tetrahedron at Cu(001) surface: aging and relaxation
	Sun Changqing
	Chemistry 06 September 2005
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	Abstract:It is shown that the Cu3O2 paring tetrahedron formed at Cu(001) surface will suffer dehybridization under annealing.
	TO cite this article:Sun Changqing. Cu3O2 pairing tetrahedron at Cu(001) surface: aging and relaxation[OL].[ 6 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2802


	5. Electronic process of Cu(Ag, V, Rh)-(001) surface oxidation: atomic valences and bonding kinetics
	Sun Changqing
	Chemistry 09 August 2005
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	Abstract:The electronic processes of Cu(Ag, V, Rh)(001) surface oxidation are comparatively analyzed based on the recent ‘chemical bond – valence band – potential barrier’ (BBB) correlation mechanism [C. Q. Sun, Prog. Mater. Sci. 48, 521-685 (2003)], which allows reaction formulae for all the observed phases with identification of individual atomic valence and the binding kinetics at the surfaces with the same geometry. It is consistently understood that the forming kinetics of the primary oxide tetrahedron and its derivative on the valence density-of-states are intrinsically common for all these analyzed systems, though the patterns of observation in terms of morphology and crystallography vary from situation to situation. However, the lattice size and electronegativity of the host surfaces determine extrinsically the site selectivity of the oxygen, the order of bond formation and the orientation of the oxide tetrahedron.
	TO cite this article:Sun Changqing. Electronic process of Cu(Ag, V, Rh)-(001) surface oxidation: atomic valences and bonding kinetics[OL].[ 9 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2631


	6. Estimating the extent of surface oxidation by measuring the porosity dependent dielectrics of oxygenated porous silicon
	L. K. Pan,Sun Changqing,C. M. Li
	Chemistry 02 August 2005
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	Abstract:Surface oxidation and porosity variation play significant roles in the dielectric performance of porous silicon (PS) yet discriminating the contribution of these events is a challenge. Here we present an analytical solution that covers contributions from the components of silicon oxide surface, silicon backbone and voids using a serial-parallel capacitance structure. Agreement between modeling predictions and measurement has been realized, which turns out an effective method that enables us to estimate the extent of surface oxidation of a specimen by measuring the porosity dependent dielectric response of the chemically passivated PS, and provides guidelines that could be useful for designing dielectric porous structures with surface oxidation.
	TO cite this article:L. K. Pan,Sun Changqing,C. M. Li. Estimating the extent of surface oxidation by measuring the porosity dependent dielectrics of oxygenated porous silicon [OL].[ 2 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2587


	7. On rotation uncertainty in the resolution of two-way evolving data
	Feng Gan
	Chemistry 17 March 2005
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	Abstract:This paper shows that two-way evolving data does not have the rotation uncertainty problem itself. The so-called rotation uncertainty problem comes from the convergence criterion of minimum squared residual. It is possible to solve the problem by introducing proper convergence criterion.
	TO cite this article:Feng Gan. On rotation uncertainty in the resolution of two-way evolving data[OL].[17 March 2005] http://en.paper.edu.cn/en_releasepaper/content/1714


	8. Ultrasound-assisted On-line Hydrolysis Flow Injection Spectrophotometryfor Rapid Determination of Polysaccharides
	Zhi-Qi Zhang,Zhi-Chao Fan
	Chemistry 02 March 2005
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	Abstract:Based on ultrasound-assisted on-line hydrolysis, a rapid and simple flow injection method is developed for the spectrophotrometric determination of polysaccharides with 3,5-dinitrosalicylic acid color reaction. In hydrolysis coil, placed in an ultrasonic and heating water bath, polysaccharides in dilute HCl solution were on-line hydrolyzed into reducing sugars. When the concentration of HCl solution was 2.5 mol L-1, the polysaccharide (glucan) of molecular weight 500,000 could be quickly and quantitatively hydrolyzed. Then the reducing sugars reacted with alkaline 3, 5-dinitrosalicylic acid solutions to form a red compound and the absorbance at 540 nm were measured. Expressed in glucose, the detection limits and linear ranges were 10 µg mL-1 and 20 -- 150 µg mL-1, respectively. The sampling rate was 45 h-1 and the average recoveries of known amount of the polysaccharide ranged between 96.0-102 %.
	TO cite this article:Zhi-Qi Zhang,Zhi-Chao Fan. Ultrasound-assisted On-line Hydrolysis Flow Injection Spectrophotometryfor Rapid Determination of Polysaccharides[OL].[ 2 March 2005] http://en.paper.edu.cn/en_releasepaper/content/1625

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