Pulsed (Field) Gradient Spin Echo (PGSE) NMR에 의한 ADS/OTAC 혼합 수용액에서의 콜로이드 회합체의 자가 확산 계수

• 영문명: Self-Diffusion Coefficients of Colloidal Association Structures in ADS/OTAC Mixed Aqueous Solutions by Pulsed (Field) Gradient Spin Echo-NMR
• 발행기관: 한국응용과학기술학회 (구.한국유화학회)
• 저자명: 김홍운(Kim HongUn) 임경희(Lim KyungHee) 김은희(Kim EunHee) 정재준(Cheong ChaeJoon)
• 간행물 정보: 『한국응용과학기술학회지』한국유화학회지 제19권 제4호, 339~348쪽, 전체 10쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2002.12.31

영문 초록

Self-diffusion coefficients of colloidal ass9Ciation structures in the aqueous solutions of anionic ammonium dodecyl sulfate (ADS) and cationic octadecyltrimethylammonium chloride (OTAC) surfactants were measured by pulsed-gradient spin echo NMR. The results were interpreted on the basis of the ADS/OTAC/water phase diagram. Crossing the phase boundaries, significant changes in self diffusion coefficients were observed and well correlated to the phase diagram. For the micelles their apparent radii were obtained from Stokes-Einstein equation. Their values were 15 for the ADS micelles and 54AA for the OTAC micelles, respectively. For vesicles which were formed spontaneously at different relative amounts of the surfactants and total surfactant concentrations, the radius was measured as 50 to 200 nm. This result is in fair agreement with those by TEM and light scattering.

키워드

Pulsed gradient spin echo PGSE NMR self-diffusion coefficient mixed micelle ammonium dodecyl sulfate octadecyltrimethylammonium chloride