Multicomponent diffusion of interacting, nonionic micelles with hydrophobic solutes,Soft Matter

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Multicomponent diffusion of interacting, nonionic micelles with hydrophobic solutes
Soft Matter ( IF 2.9 ) Pub Date : 2020-10-07 , DOI: 10.1039/d0sm01406k
Nathan P. Alexander _{1,

2,

3,

4} , Ronald J. Phillips _{1,

2,

3,

4} , Stephanie R. Dungan _{1,

2,

3,

4,

5}

Affiliation

Ternary diffusion coefficient matrices [D] were measured using the Taylor dispersion method, for crowded aqueous solutions of decaethylene glycol monododecyl ether (C₁₂E₁₀) with either decane or limonene solute. The matrix [D], for both systems, was found to be highly non-diagonal, and concentration dependent, over a broad domain of solute to surfactant molar ratios and micelle volume fractions. A recently developed theoretical model, based on Batchelor's theory for gradient diffusion in dilute, polydisperse mixtures of interacting spheres, was simplified by neglecting local polydispersity, and effectively used to predict [D] with no adjustable parameters. Even though the model originates from dilute theory, the theoretical results were in surprisingly good agreement with experimental data for concentrated mixtures, with volume fractions up to ϕ ≈ 0.47. In addition, the theory predicts eigenvalues D₋ and D₊ that correspond to long-time self and gradient diffusion coefficients, respectively, for monodisperse spheres, in reasonable agreement with experimental data.

中文翻译：

相互作用的非离子胶束与疏水性溶质的多组分扩散

使用泰勒分散法测量三元扩散系数矩阵[ D ] ，以分析癸癸或li烯溶质对十乙二醇单_十二烷基醚（C ₁₂ E ₁₀）的拥挤水溶液。对于两种体系，发现基质[ D ]在溶质与表面活性剂的摩尔比和胶束体积分数的较宽范围内高度非对角线且浓度依赖性。基于巴切勒理论的相互作用球体稀，多分散混合物中梯度扩散的最新开发的理论模型，通过忽略局部多分散性而得到简化，并有效地用于预测[ D]，没有可调参数。尽管从理论稀模型起源，理论结果与浓混合了实验数据，用体积分数出乎意料的好协议φ ≈0.47。另外，理论预测的特征值d _-和d ₊对应于分别长期自我和梯度扩散系数，对单分散球体，与实验数据合理地一致。

更新日期：2020-11-12

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