Salt Effects on Lamellar Structure of Nonionic Surfactants

Salt Effects on Lamellar Structure of Nonionic Surfactants
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盐对非离子表面活性剂层状结构的影响

DOI:
10.1007/s10953-016-0529-z
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发表时间:
2016
期刊:
J. Solution Chem.
影响因子:
--
通讯作者:
Kazuya Saito
Kazuya Saito
中科院分区:
--
文献类型:
--
作者:
Mafumi Hishida;Yohei Kaneko;Yasuhisa Yamamura;Kazuya Saito

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用小角x射线衍射研究了单价盐和单原子盐对非离子表面活性剂(单肌醇和单肌醇)片层重复距离的影响。层间重复距离(双分子层和夹层水层厚度之和)随着盐浓度的增加而增加,并具有很强的阴离子依赖性(BrCl)。发现水层厚度的增加主导了水化强度的增加。由于阴离子依赖性与初次水化强度的离子依赖性不一致,我们之前报道过(Hishida et al.)。J Chem Phys 142:171101, 2015),通常认为的水合力不是增加的原因。这意味着增加不能用现有的中性带电双层之间的力模型来解释。温度依赖性也支持了离子作用新机制的必要性。这一新的机理似乎与一次水化水以外的水结构有关,即二次水化水的结构取决于离子的种类。
Effects of monovalent and monatomic salts on lamellar repeat distancesdof nonionic surfactants (monomyristolein and) are investigated using small-angle X-ray diffraction. The lamellar repeat distances (sum of thicknesses of a bilayer and a sandwiched water layer) increase with increasing salt concentration with a strong anion dependence (BrCl). The increase of the thickness of the water layer is found to dominate the increase ind. Since the anion dependence is inconsistent with the ion dependence of the strength of the primary hydration, we reported previously (Hishida et al. J Chem Phys 142:171101, 2015), the hydration force classically considered is not the origin of the increase ind. This means the increase indcannot be explained by the existing model of the forces between neutrally charged bilayers. The temperature dependence ofdalso supports the necessity for a new mechanism of the effect of ions. The new mechanism seems to be related to the water structure beyond the primary hydration water, i.e., the secondary hydration water, which depends on the ion species.
层状和凝胶状态下单甘油酯双层之间的排斥压力
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