Effect of surfactant excess on the stability of low-polarity ferrofluids probed by small-angle neutron scattering


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Аннотация

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.

Авторлар туралы

V. Petrenko

Joint Institute for Nuclear Research; Taras Shevchenko National University of Kyiv

Хат алмасуға жауапты Автор.
Email: vip@nf.jinr.ru
Ресей, Dubna, Moscow oblast; Kyiv

M. Avdeev

Joint Institute for Nuclear Research

Email: vip@nf.jinr.ru
Ресей, Dubna, Moscow oblast

L. Bulavin

Taras Shevchenko National University of Kyiv

Email: vip@nf.jinr.ru
Украина, Kyiv

L. Almasy

Wigner Research Centre for Physics

Email: vip@nf.jinr.ru
Венгрия, Budapest

N. Grigoryeva

St. Petersburg State University

Email: vip@nf.jinr.ru
Ресей, St. Petersburg

V. Aksenov

Konstantinov Petersburg Nuclear Physics Institute; Joint Institute for Nuclear Research

Email: vip@nf.jinr.ru
Ресей, Gatchina; Dubna, Moscow oblast

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