摘要
本文用自差拍光混频的准弹性激光散射技术,对生物组织重要组成部分的C_a-卵磷脂水溶液内微团的流体力学半径随卵磷脂浓度,温度,添加的单价盐离子类型和强度的变化情况,进行了系统性研究.并根据微团形成的梯级模型,推导出微团的大小和结构在微团形成过程中的变化,微团形成参数以及盐控制微团形成的规律.
From the quasielastic light scattering measurements of salt free, KCl and KI added aqueous C8-lecithine micellar solutions in one phase region, we deduced the mean hydrodynamic radii of the micelles as a function of amphiphile concentration, temperature, ionic identity and strength. We found that KI monotonically decreased the micellar size while KC1 first slightly decreased then increased the micellar size as the ionic strength increased. This is just as what predicted by the micellar growth parameter μ which we determined previously from coexistence curves. The deduced values of μ of these systems from the quasielastic light scattering data using the ladder model of micellar growth and YamaKawa' s theory of micellar shape are in reasonable agreement with those from coexistence curves, and also approximately temperature-independent. The behavior of the micellar growth with amphiphile concentration in these systems confirms such a suggestion: the micellar growth follows a way of a continuous transition in micellar size and shape from spherical aggregates to polydisperse worm-like, locally cylindrical but flexible structures.
出处
《生物物理学报》
CAS
CSCD
北大核心
1991年第2期140-145,共6页
Acta Biophysica Sinica
关键词
C8-卵磷脂
弹性激光散射
微团
Quasielastic light scattering
C8-lecithin
Micelle.
