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Yu B.,Tsinghua University | Wang J.,Tsinghua University | Ma P.,Tsinghua University | Xiang L.,Tsinghua University | Wang L.,Nafine Chemical Industry Group Co.
Materials Research Innovations | Year: 2015

The influence of the activity of Mg(OH)2 on the formation of magnesium hydroxide chloride hydrate 3 Mg(OH)2·MgCl2·8H2O (abbreviated as 318MHCH) nanowires was investigated in this paper. Active Mg(OH)2 was synthesised from Mg(OH)2 agglomerates via calcination at 500°C for 1 hour followed by hydration in water at 80°C for 1 hour. The calcination-hydration pretreatment led to the increase of the specific surface area of Mg(OH)2 from 11·4 to 46·7 m2 g-1 and the decrease of the primary crystallite sizes of (001) from 20·6 to 13·7 nm. 318MHCH nanowires with a length of 80-120 μm and a diameter of 50-100 nm were produced by aging of the mixture containing active Mg(OH)2 and 4 mol L-1 MgCl2 at 80°C for 24 hours. © W. S. Maney & Son Ltd 2015. Source

Wang Z.-Y.,Dalian University of Technology | Wang Z.-Y.,Nafine Chemical Industry Group Co. | Zhang S.-F.,Dalian University of Technology | Fang Y.,Jiangnan University | Qi L.-Y.,Jiangnan University
Journal of Surfactants and Detergents | Year: 2010

Here, we present experimental surface tension isotherms of mixed solutions of a zwitterionic surfactant a-decylbetaine (DB) and an anionic surfactant sodium dodecyl sulfate (SDS) in different molar ratios. These mixed solutions show a composition dependency with respect to both surface tension effectiveness and critical micelle concentration. The pseudo-regular solution theory has been used to evaluate the interaction parameters in the micelle, βm and at the surface, βs. The results revealed that the mixed solutions of DB/SDS behave synergistically in both surface tension reduction effectiveness and mixed micelle formation at all mole fractions investigated. The values of adsorption area per surfactant molecule at air/ solution interface were estimated, which provides some useful information on evaluating the interaction between DB and SDS in mixed adsorbed monolayers. The solubilization behaviors of toluene in DB/SDS mixed solutions were also investigated to help in understanding the structure of mixed micelles of DB and SDS. © AOCS 2010. Source


Nafine Chemical Industry Group Co. | Date: 2013-06-28

Sulphates; Sulphides; Barium sulphate; Glycerine for industrial purposes; chemical preparations, namely, sodium salts; Soda ash.

Wang Z.-Y.,Dalian University of Technology | Wang Z.-Y.,Nafine Chemical Industry Group Co. | Zhang S.-F.,Dalian University of Technology | Fang Y.,Jiangnan University | And 2 more authors.
Journal of Surfactants and Detergents | Year: 2010

A nucleophilic substitution reaction was developed to synthesize the zwitterionic surfactant using a renewable natural fatty acid rather than a petroleum derivative as the raw material. The kinetics and mechanism of the nucleophilic substitution reaction of trimethylamine αorododecyl carboxylate with trimethylamine were investigated in protic and dipolar aprotic solvents including water, ethanol and N, N-dimethyl formamide. The rate equations were derived using initial rates and the activation parameters in different solvents were determined empirically and compared with each other to obtain important information about the reaction mechanism. The overall second-order reaction number and the negative activation entropy supported a bimolecular nucleophilic substitution (SN2) mechanism, combined with the pseudo-first-order kinetics for each reactant. The experimental results also showed that the reaction reactivity diminishes with the decrease in polarity of protic solvents. The typical dipolar aprotic solvent dimethyl formamide distinctively promoted the reaction in. This fact was successfully explained by the solvation rule for SN2 reactions. © AOCS 2010. Source

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