期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 418, 期 -, 页码 95-102出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.11.078
关键词
pH-responsive; Threadlike micelles (TLMs); Rheology; Drag reduction; Cryo-transmission electron microscopy (Cryo-TEM); NMR; Zeta potential
资金
- Ohio State University
- National Natural Science Foundation of China [51206186]
A pH-responsive threadlike micellar system was developed by mixing alkyl bis(2-hydroxyethyl)methylammonium chloride (EO12) and trans-o-coumaric acid (tOCA). The rheological response of this system to pH is unusual in that it has viscoelasticity at both high and low pH levels, while it shows water-like behaviors at medium pH. Cryogenic transmission electron microscopy (Cryo-TEM) images confirmed the presence of TLMs at pH 3.5 and pH 9.8. This system also had DR (drag reduction) capability at low and high pH. The unusual rheological and micellar responses of this system to pH are caused by the dual pK(a)'s of tOCA. H-1 NMR and zeta potential results support this hypothesis. (C) 2013 Elsevier Inc. All rights reserved.
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