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Peng J.,China West Normal University | Li X.,China West Normal University | Tang C.,China West Normal University | Bai W.,CAS Chengdu Institute of Organic Chemistry
Green Chemistry | Year: 2014

Dehydration of lactic acid was performed over various metal sulphates. BaSO4 was found to show an efficient activity for dehydration of lactic acid to acrylic acid due to the moderate acidity on its surface. Under the optimal conditions, 99.8% lactic acid conversion and 74.0% acrylic acid selectivity were achieved over the BaSO4 catalyst. © 2014 The Royal Society of Chemistry. Source


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
Soft Matter | Year: 2010

Wormlike micellar gels formed by concentrated 3-(N-erucamidopropyl-N,N- dimethyl ammonium) propanesulfonate (EDAS) solutions show both gel-like behavior and shear banding transitions. Such surfactant gels are strong viscoelastic fluids with ultra-long but finite relaxation time, instead of bulk gels with infinite zero-shear viscosity and relaxation time. We demonstrate for the first time the relationship between the yield stress and shear banding transition of the surfactant gels. © 2010 The Royal Society of Chemistry. Source


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
Langmuir | Year: 2012

Long-chain amidosulfobetaine surfactants, 3-(N-fattyamidopropyl-N,N- dimethyl ammonium) propanesulfonates (n-DAS, n > 18), are insoluble in pure water due to their high Krafft temperature (T K), while they are soluble when inorganic salt is added to the surfactant solution as the T K of these zwitterionic surfactants is decreased. The influence of the salt content and ionic species of the added electrolytes on the T K of the series of amidosulfobetaine surfactants was examined by means of UV-vis spectrophometry and visual inspection. It was found that the T K of these surfactants depends strongly on not only the hydrophobic alkyl length (n), but also the salinity of the aqueous environment. When the salt concentration is increased from 0 to 100 mM, the T K shows a sharp decrease; when the salinity is fixed between 100 and 2000 mM, the T K varies linearly with n with a slope of ∼7.7 irrespective of the salt species and the salt content. When the salt concentration is further increased above 2000 mM, a linear function is still observed, but the slope increases slightly. © 2011 American Chemical Society. Source


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
Chemical Communications | Year: 2010

A novel pH-switchable wormlike micellar system was prepared by mixing N-erucamidopropyl-N,N-dimethylamine and maleic acid with molar ratio of 2:1. The viscosity of the micellar solution is switchable via tuning the pH through the addition of minor acid or base. Such a system possesses the characteristics of a facile, rapid, cost-effective reversible process and recyclable cheaper materials. © 2010 The Royal Society of Chemistry. Source


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
ACS Sustainable Chemistry and Engineering | Year: 2013

There is no doubt that the surfactant and detergent industry is facing increasing severe environmental impact, and environmentally benign pathways are preferred to prepare these materials. We report herein a green route toward the preparation of vegetable-derived long-chain surfactants. The synthesis process possesses the following characteristics: bioresource-derived erucic acid (leftovers of rapeseed oil) was used as a starting material; no solvent was used and no chemical waste was produced; and high-yield products could be obtained in short reaction time. Compared with traditional surfactants bearing a saturated hydrophobic tail shorter than C18, the erucic acid-derived surfactants are more environmentally friendly because of their lower dosages in practical applications and the presence of the chemical degradable unsaturated bond and amido group in their molecular architecture. © 2012 American Chemical Society. Source

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