Temperature-dependent fractal structure of particle clusters in aqueous ferrofluids by small-angle scattering

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00541431" target="_blank" >RIV/61389005:_____/21:00541431 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.colsurfa.2020.126090" target="_blank" >https://doi.org/10.1016/j.colsurfa.2020.126090</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.colsurfa.2020.126090" target="_blank" >10.1016/j.colsurfa.2020.126090</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Temperature-dependent fractal structure of particle clusters in aqueous ferrofluids by small-angle scattering

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Temperature-dependent fractal structure of particle clusters in aqueous ferrofluids by small-angle scattering

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/LTT18021" target="_blank" >LTT18021: Spolupráce ČR s SÚJV Dubna v teoretické a jaderné fyzice a při využití jaderných metod v dalších oborech</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Colloids and Surfaces A-Physicochemical and Engineering Aspects

ISSN

0927-7757

e-ISSN

1873-4359

Svazek periodika

613

Číslo periodika v rámci svazku

MAR

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

126090

Kód UT WoS článku

000620191700003

EID výsledku v databázi Scopus

2-s2.0-85099181080