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首页> 外文期刊>Crystallography reports >Effect of surfactant excess on the stability of low-polarity ferrofluids probed by small-angle neutron scattering
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Effect of surfactant excess on the stability of low-polarity ferrofluids probed by small-angle neutron scattering

机译：表面活性剂过量对小角度中子散射探测低极性铁磁流体稳定性的影响

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摘要

The structures of ferrofluids (FFs) based on nonpolar solvent decahydronaphthalene, stabilized by saturated monocarboxylic acids with hydrocarbon chains of different lengths, C16 (palmitic acid) and ?12 (lauric acid), with an excess of acid molecules, have been studied by small-angle neutron scattering. It is found that the addition of acid to an initially stable system with optimal composition leads to more significant structural changes (related to aggregation) than those observed previously for this class of FFs. A comparison of the influence of monocarboxylic acids on the stability of nonpolar FFs suggests that the enhancement of aggregation is much more pronounced in the case of palmitic acid excess. This fact confirms the conclusion of previous studies, according to which an increase in the hydrocarbon chain length in a saturated acid reduces the efficiency of the corresponding FF stabilization.
机译：小型研究了基于非极性溶剂十氢萘的铁磁流体（FFs）的结构，该结构被具有不同长度的烃链的饱和一元羧酸，C16（棕榈酸）和α12（月桂酸）稳定，并带有过量的酸分子。角中子散射。发现将酸添加到具有最佳组成的最初稳定的系统中会导致比以前对于此类FF观察到的结构变化更为显着的结构变化（与聚集相关）。单羧酸对非极性FFs稳定性的影响的比较表明，在棕榈酸过量的情况下，聚集的增强更为明显。这一事实证实了先前研究的结论，根据该结论，饱和酸中烃链长度的增加会降低相应FF稳定化的效率。

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