The influence of concentration and pH on the structure and rheology of cationic surfactant/hydrotrope structured fluids
作者： Karolaine N. Silva , Ramon Novoa-Carballal , Markus Drechsler , Axel H.E. Müller , Evis K. Penott-Chang
DOI: 10.1016/J.COLSURFA.2015.10.054
关键词: Micelle 、 Cationic polymerization 、 Organic chemistry 、 Phthalic acid 、 Shear rate 、 Pulmonary surfactant 、 Hydrotrope 、 Aqueous solution 、 Chemistry 、 Rheology 、 Chemical engineering
摘要: Abstract In this paper, we show how to tailor the structure and rheology of aqueous solutions cationic surfactant cetyltrimethylammonium tosylate, CTAT, by adding a hydrotrope (potassium phthalic acid, PPA) or changing pH. Aqueous neat CTAT CTAT/PPA binary mixtures were evaluated under different concentrations compared with an analogous surfactant, chloride (CTAC). PPA content promotes substantial increases in micellar flexibility inter-micellar entanglements, resulting higher degree fluid. Increasing pH leads significant low shear rate viscosities comparison at its original pH, because OH ions favor aggregation as well growth worm-like micelles. Nevertheless, increasing produced progressive decrease viscosities. This result is due nature interactions between PPA, ionization functional groups present PPA. Cryo-TEM 1 H NMR measurements evidenced, respectively, microstructural chemical environmental changes upon addition explain rheological properties function fluid structure.
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