Spontaneous Wave Induced by Nonlinear Adsorption of Surfactant in Oil/Water/Glass Interface

• Kuragane Sachiko

  Department of Chemistry and Chemical Engineering, Yamagata University, Japan

• Fujii Takahiro

  Department of Chemistry and Chemical Engineering, Yamagata University, Japan

• Shioi Akihisa

  Department of Chemistry and Chemical Engineering, Yamagata University, Japan

Abstract

Spontaneous wave formation in nitrobenzene/water interface was investigated, focusing on effect of the chemical nature of container wall on adsorption/desorption kinetics of surfactant. Cationic surfactant, trimethylstearylammoniumchloride TSAC was dissolved in the aqueous phase, and iodine was included in nitrobenzene. Macroscopic wave was spontaneously generated. Characteristics of the waves were investigated as a function of surface charge of container wall. The surface charge of borosilicate glass was estimated from -potential which was regulated by pH of the aqueous phase. Teflon ware was also used for the container since it was almost inert for surfactant adsorption. We found that spontaneous wave was not formed unless container wall adsorbed surfactant. Waveform was more distinct and the lifetime of the wave-motion was shorter when the pH was higher. The lifetime was well correlated by ξ-potential of borosilicate glass when it was negatively charged. These were understood in terms of flux of surfactant-transfer from the aqueous to the organic phases with the aid of the container wall. It has been pointed out that the wave formation was associated with chemical reaction of TSAC and iodine. We indicated that adsorption of TSAC onto negatively charged wall due to electrostatic interaction caused contact angle change of oil/water interface onto the container wall, i.e., the contact angle changing from the hydrophilic to the hydrophobic ones. Adsorbed TSAC probably reacted with iodine or its chemical derivatives. Desorption of oil-soluble compounds comprised of TSAC and iodine turned the contact angle back to the hydrophilic one. This was a trigger of following evolution of the nonlinear wave.

Journal

• Asian Pacific Confederation of Chemical Engineering congress program and abstracts

  Asian Pacific Confederation of Chemical Engineering congress program and abstracts 2004 (0), 674-674, 2004

  The Society of Chemical Engineers, Japan

Keywords

• Nonlinear wave of oil/water interface
• surfactant adsorption onto solid surface
• periodic change in contact angle

Details

• CRID: 1390282680707055744
• NII Article ID: 130005052745
• DOI: 10.11491/apcche.2004.0.674.0
• Text Lang: en
• Data Source:
  • JaLC
  • CiNii Articles
• Abstract License Flag: Disallowed