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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Growth of AOT Reversed Micelles and the Solvent Effect Investigated by Dielectric and Light-Scattering Measurements
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Growth of AOT Reversed Micelles and the Solvent Effect Investigated by Dielectric and Light-Scattering Measurements

机译：AOT反向胶束的生长以及介电和光散射测量研究的溶剂效应

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摘要

The relative permittivity (epsilon_r) and the conductivity (kappa) at a frequency (f) of 50 kHz,and the dynamic light-scattering were measured for ternary systems of (AOT + rcentre dotH_2O) solved in cyclohexane,heptane,octane,decane,and dodec-ane at a temperature of 298.15 K as a function of the amount ratio (r) of water to AOT (r=[H_2O]/[AOT]) up to the onset of percolation.The molality (m) of AOT for those solutions was 0.15 mol kg~(-1),and increased to 0.30 mol kg~(-1) for solutions with dodecane.By increasing r,spherical reversed micelles were formed at rapprox=6 in straight-chain hydrocarbons.The light-scattering measurements indicated that the mean hydrodynamic diameter of the micelles increased with increasing r,showing a sigmoid curve.The growth of micelles was promoted in a longer chain hydrocarbon.The percolation transition occurred as the particles grew to a critical diameter of about 50 nm.On the other hand,the growth of particles in c-hexane was moderate,and percolation did not occur up to r=90,where the solution turned turbid.The growth of particles found from light-scattering measurements was well correlated to dielectric observations.
机译：测量了在环己烷，庚烷，辛烷，癸烷，四氢呋喃和三乙胺中溶解的三元体系（AOT + rcentre dotH_2O）的相对介电常数（epsilon_r）和电导率（kappa），以及动态光散射。 298.15 K温度下的十二烷和十二烷作为水与AOT的量比（r）（r = [H_2O] / [AOT]）的函数，直到发生渗滤为止。AOT的摩尔浓度（m）这些溶液为0.15 mol kg〜（-1），对于十二烷溶液则增加到0.30 mol kg〜（-1）。通过增加r，在rapprox = 6的直链烃中形成球形的反向胶束。散射测量表明，胶束的平均流体力学直径随r的增加而增加，呈S型曲线;胶束的生长在较长链的烃中得到促进;当颗粒长至约50 nm的临界直径时，发生了渗滤转变。另一方面，在正己烷中颗粒的生长适中，渗滤d直到r = 90时，id才出现，溶液变成浑浊。通过光散射测量发现的粒子的生长与电介质观测值相关。

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