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Temperature-dependent fractal structure of particle clusters in aqueous ferrofluids by small-angle scattering
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SYSNO ASEP 0541431 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Temperature-dependent fractal structure of particle clusters in aqueous ferrofluids by small-angle scattering Author(s) Tomchuk, O. V. (RU)
Avdeev, M. V. (RU)
Aksenov, V. L. (RU)
Shulenina, A. V. (RU)
Ivankov, O. I. (RU)
Ryukhtin, Vasil (UJF-V) RID, ORCID, SAI
Vekas, L. (RO)
Bulavin, L. A. (UA)Number of authors 8 Article number 126090 Source Title Colloids and Surfaces A-Physicochemical and Engineering Aspects. - : Elsevier - ISSN 0927-7757
Roč. 613, MAR (2021)Number of pages 8 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords aqueous ferrofluids ; fractal aggregation ; temperature-induced reorganization ; small-angle scattering ; contrast variation ; poldispersity analysis Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects LTT18021 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CANAM II - 90056 - Ústav jaderné fyziky AV ČR, v. v. i.
Reactors LVR-15 and LR-0 II - 90120 - Centrum výzkumu Řež s.r.o.Method of publishing Limited access Institutional support UJF-V - RVO:61389005 UT WOS 000620191700003 EID SCOPUS 85099181080 DOI 10.1016/j.colsurfa.2020.126090 Annotation The heating effect in the temperature interval of 20-70 degrees C on the aggregate structure in aqueous ferrofluids is analyzed basing on the data of small-angle X-ray (SAXS) and neutron (SANS) scattering. Samples prepared according to the same stabilization procedure (double-layer surfactant coating) but with different dispersed magnetic materials (magnetite and cobalt ferrite) show different temperature sensitivity. A temperature-induced reorganization from developed aggregates to elongated chain-like aggregates is revealed by observing changes in the scattering curves, which are considered in the frame of the fractal concept. In addition to the determination of fractal dimension, the accent is also given to the cut-off effect in the scattering curves induced by the finite aggregate size. The scattering model is chosen from the available approaches basing on the analysis of the dimension-dependent universal parameter of the average aggregate form-factor, which continuously changes with varying temperature. The particle polydispersity is taken into account. The contrast variation based on isotope (H/D) substitution in solvent is done in SANS experiments to conclude about the structural organization of magnetic particles and surfactant component in the systems. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2022 Electronic address https://doi.org/10.1016/j.colsurfa.2020.126090
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