화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.98, 458-464, June, 2021
DOI10.1016/j.jiec.2021.03.018  Export Citation
Effects of NaCl and temperature on rheological characteristics and structures of CTAB/NaSal wormlike micellar solutions
Emad Jafari Nodoushan1, Young Ju Lee1, 2, Hae-Joong Na3, Byoung-Hee You1, 4, Moo-Yeon Lee5, and Namwon Kim1, 6, †
  • 1Materials Science, Engineering, and Commercialization, Texas State University, San Marcos, TX 78666, USA
  • 2Department of Mathematics, Texas State University, San Marcos, TX 78666, USA
  • 3Institute of Industrial Technology, Yeungnam University, Gyeongsan 38541, Republic of Korea
  • 4Department of Engineering Technology, Texas State University, San Marcos, TX 78666, USA
  • 5Department of Mechanical Engineering, Dong-A University, Busan 49315, Republic of Korea
  • 6Ingram School of Engineering, Texas State University, San Marcos, TX 78666, USA
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Sodium chloride (NaCl) is the most abundant salt in seawater, which showed the strongest effect in lowering the viscosity of wormlike micellar solutions (WMS) compared to other investigated ionic compounds. In this study, we examined the effect of NaCl addition on the structure of wormlike micelles using the semi-quantitative rheo-structure relations provided by the reaction-reptation model. Prior to addition of NaCl, the structure of wormlike micelles ([CTAB]/[NaSal] = 1 at [CTAB] = 100 mM) in the solution were investigated at different temperatures (25 ℃ ＜ T ＜ 60 ℃). At higher temperatures, shorter relaxation times and lower ratio values for the local minimum of loss modulus (G " min ) over the plateau modulus (G ' 0 ) were observed. Our results showed that while the zero-shear viscosity of WMS decreased by NaCl addition (S = [NaCl]/[CTAB] varied from 0 to 9), its first critical shear rate and shear stress plateau were observed at their higher values. In addition, while the relaxation time of WMS decreased by adding NaCl, values of G '' min=G ' 0 did not change accordingly. These results indicate that branch points were formed upon the addition of NaCl and led to the shorter relaxation time and lower zero-shear viscosity.
Keywords:Wormlike micelles;Viscoelastic;Shear rheology;Salts;Surfactants
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