A drag reducing surfactant threadlike micelle system with unusual rheological responses to pH.
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. (1)H NMR and zeta potential results support this hypothesis.
Department of Chemical and Biomolecular Engineering, The Ohio State University, 140 W 19th Ave, Columbus, OH 43210, USA.
Haifeng
H
Shi
Department of Chemical and Biomolecular Engineering, The Ohio State University, 140 W 19th Ave, Columbus, OH 43210, USA.
Wu
W
Ge
Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum, Beijing 102249, China.
Yi
Y
Wang
Research Center of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
Bo
B
Fang
Department of Chemical and Biomolecular Engineering, The Ohio State University, 140 W 19th Ave, Columbus, OH 43210, USA.
Jacob T
JT
Huggins
Department of Chemical and Biomolecular Engineering, The Ohio State University, 140 W 19th Ave, Columbus, OH 43210, USA.
Tyler A
TA
Russell
Department of Chemical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Yeshayahu
Y
Talmon
Department of Chemistry, The Ohio State University, Columbus, OH 43210, USA.
David J
DJ
Hart
Department of Chemical and Biomolecular Engineering, The Ohio State University, 140 W 19th Ave, Columbus, OH 43210, USA. Electronic address: zakin.1@osu.edu.
Jacques L
JL
Zakin
Cryo-transmission electron microscopy (Cryo-TEM); Drag reduction; NMR; Rheology; Threadlike micelles (TLMs); Zeta potential; pH-responsive