Temperature Effect on the Nanostructure of SDS Micelles in Water.

IF 1.5 4区工程技术 Journal of Research of the National Institute of Standards and Technology Pub Date : 2013-04-11 eCollection Date: 2013-01-01 DOI:10.6028/jres.118.008

Boualem Hammouda

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引用次数: 146

Abstract

Sodium dodecyl sulfate (SDS) surfactants form micelles when dissolved in water. These are formed of a hydrocarbon core and hydrophilic ionic surface. The small-angle neutron scattering (SANS) technique was used with deuterated water (D2O) in order to characterize the micelle structure. Micelles were found to be slightly compressed (oblate ellipsoids) and their sizes shrink with increasing temperature. Fits of SANS data to the Mean Spherical Approximation (MSA) model yielded a calculated micelle volume fraction which was lower than the SDS surfactant (sample mixing) volume fraction; this suggests that part of the SDS molecules do not participate in micelle formation and remain homogeneously mixed in the solvent. A set of material balance equations allowed the estimation of the SDS fraction in the micelles. This fraction was found to be high (close to one) except for samples around 1 % SDS fraction. The micelle aggregation number was found to decrease with increasing temperature and/or decreasing SDS fraction.

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温度对水中SDS胶束纳米结构的影响。

十二烷基硫酸钠(SDS)表面活性剂溶于水时形成胶束。它们由碳氢化合物核和亲水离子表面组成。用小角中子散射(SANS)技术对氘化水(D2O)进行表征。发现胶束被轻微压缩(扁椭球)，其尺寸随着温度的升高而缩小。将SANS数据与平均球面近似(MSA)模型拟合得到的胶束体积分数低于SDS表面活性剂(样品混合)体积分数;这表明部分SDS分子不参与胶束形成，在溶剂中保持均匀混合。一组物质平衡方程允许估计胶束中的SDS分数。该分数被发现是高的(接近1)，除了样品约1% SDS分数。胶束聚集数随着温度的升高和SDS分数的降低而降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of Research of the National Institute of Standards and Technology Engineering-General Engineering

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期刊介绍： The Journal of Research of the National Institute of Standards and Technology is the flagship publication of the National Institute of Standards and Technology. It has been published under various titles and forms since 1904, with its roots as Scientific Papers issued as the Bulletin of the Bureau of Standards. In 1928, the Scientific Papers were combined with Technologic Papers, which reported results of investigations of material and methods of testing. This new publication was titled the Bureau of Standards Journal of Research. The Journal of Research of NIST reports NIST research and development in metrology and related fields of physical science, engineering, applied mathematics, statistics, biotechnology, information technology.