Influence of Alcohol on the Behavior of Sodium Dodecylsulfate Micelles.
Influence of Alcohol on the Behavior of Sodium Dodecylsulfate Micelles.
复制标题
酒精对十二烷基硫酸钠胶束行为的影响。
DOI：
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发表时间：
1998
影响因子：
9.9
通讯作者：
Mortensen
中科院分区：
文献类型：
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作者：
Førland;Samseth;Gjerde;Høiland;Jensen;Mortensen
采用小角中子散射（SANS）和傅里叶变换脉冲场梯度自旋回波（FT-PGSE）核磁共振技术研究了中链醇分子对十二烷基硫酸钠胶束的大小和形状以及表面活性剂和醇的自扩散系数的影响。所有测量均在含有0.4mol/kg的氯化钠浓度和0.04mol/kg的表面活性剂浓度的D2 O中进行。使用的醇是1-丙醇、1-丁醇和1-戊醇。从不同的技术获得的数据同意定性。结果表明，正丙醇连续分解胶束，而戊醇则导致胶束结构发生变化，形成大的蠕虫状聚集体。丁醇对胶束的结构表现出高度复杂的行为，并且可以减小和增大聚集体的尺寸，这取决于添加的醇浓度范围。所有分析的解决方案都显示出在含水本体溶液和胶束的栅栏层之间的醇的分布，导致胶束表面中D2 O的“水合”增加。此外，胶束的结构变化表明，丁醇和戊醇增溶在胶束核心的高质量摩尔浓度范围内，接近年底的溶解度极限。丙醇显然亲水性太强而不能这样做。版权所有1998学术出版社。
The effect of medium chain alcohol molecules on the size and shape of sodium dodecylsulfate micelles, and on the self-diffusion coefficient of the surfactant and alcohol, has been investigated by means of small angle neutron scattering (SANS), and Fourier transform pulsed field gradient spin echo (FT-PGSE) nuclear magnetic resonance measurements. All measurements were done in D2O containing a sodium chloride concentration of 0.4 mol/kg, and a surfactant concentration of 0.04 mol/kg. The alcohols used were 1-propanol, 1-butanol, and 1-pentanol. The data obtained from the different techniques agrees qualitatively. The results show that propanol successively breaks down the micelles while pentanol brings about a structural change toward large wormlike aggregates. Butanol shows a highly complex behavior on the structure of the micelles and can decrease and increase the size of the aggregates, depending on the added alcohol concentration range. All analyzed solutions show a distribution of the alcohol between the aqueous bulk solution and the palisade layer of the micelles, resulting in an increased "hydration" of D2O in the micellar surface. Moreover, the structural changes of the micelles indicate that butanol and pentanol solubilize in the micellar core in the high molality range, near the end of the solubility limit. Propanol is apparently too hydrophilic to do so. Copyright 1998 Academic Press.