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

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.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Joint Institute for Nuclear Research (Russian Federation)
  2. Taras Shevchenko National University of Kyiv (Ukraine)
  3. Hungarian Academy of Science, Wigner Research Centre for Physics (Hungary)
  4. St. Petersburg State University (Russian Federation)
  5. National Research Centre “Kurchatov Institute”, Konstantinov Petersburg Nuclear Physics Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22471914
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 61; Journal Issue: 1; Other Information: Copyright (c) 2016 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AGGLOMERATION; COMPARATIVE EVALUATIONS; DECALIN; DODECANOIC ACID; HEXADECANOIC ACID; LIQUIDS; MAGNETIC MATERIALS; MOLECULES; NEUTRON DIFFRACTION; PHASE STABILITY; SMALL ANGLE SCATTERING; STABILIZATION