Titania-coated manganite nanoparticles: synthesis of the shell, characterization and MRI properties

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023001%3A_____%2F17%3A00060159" target="_blank" >RIV/00023001:_____/17:00060159 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/17:00473952 RIV/68378041:_____/17:00473952

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0304885316326804?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0304885316326804?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmmm.2016.10.097" target="_blank" >10.1016/j.jmmm.2016.10.097</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Titania-coated manganite nanoparticles: synthesis of the shell, characterization and MRI properties

Popis výsledku v původním jazyce

Novel procedure for coating of oxide nanoparticles with titania, employing hydrolysis and polycondensation of titanium alkoxides under high-dilution conditions and cationic surfactants, is developed and applied to magnetic cores of perovskite manganite. Bare particles of the ferromagnetic La0.65Sr0.35MnO3 phase, possessing high magnetization, M10 kOe(4.5 K) = 63.5 emu g−1, and Curie temperature, TC = 355 K, are synthesized by solgel procedure and subsequently coated with titania. Further, a comparative silica-coated product is prepared. In order to analyse the morphology, colloidal stability, and surface properties of these two types of coated particles, a detailed study by means of transmission electron microscopy, dynamic light scattering, zeta-potential measurements, and IR spectroscopy is carried out. The experiments on the titania-coated sample reveal a continuous though porous character of the TiO2 shell, the nature of which is amorphous but can be transformed to anatase at higher temperatures. Finally, the relaxometric study at the magnetic field of 0.5 T, performed to quantity the transverse relaxivity and its temperature dependence, reveals important differences between the titania-coated and silica-coated nanoparticles.

Název v anglickém jazyce

Titania-coated manganite nanoparticles: synthesis of the shell, characterization and MRI properties

Popis výsledku anglicky

Novel procedure for coating of oxide nanoparticles with titania, employing hydrolysis and polycondensation of titanium alkoxides under high-dilution conditions and cationic surfactants, is developed and applied to magnetic cores of perovskite manganite. Bare particles of the ferromagnetic La0.65Sr0.35MnO3 phase, possessing high magnetization, M10 kOe(4.5 K) = 63.5 emu g−1, and Curie temperature, TC = 355 K, are synthesized by solgel procedure and subsequently coated with titania. Further, a comparative silica-coated product is prepared. In order to analyse the morphology, colloidal stability, and surface properties of these two types of coated particles, a detailed study by means of transmission electron microscopy, dynamic light scattering, zeta-potential measurements, and IR spectroscopy is carried out. The experiments on the titania-coated sample reveal a continuous though porous character of the TiO2 shell, the nature of which is amorphous but can be transformed to anatase at higher temperatures. Finally, the relaxometric study at the magnetic field of 0.5 T, performed to quantity the transverse relaxivity and its temperature dependence, reveals important differences between the titania-coated and silica-coated nanoparticles.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30224 - Radiology, nuclear medicine and medical imaging

Projekt

<a href="/cs/project/GA16-04340S" target="_blank" >GA16-04340S: Oxidové nanomagnety, jejich vlastnosti a interakce s biologickými systémy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of magnetism and magnetic materials

ISSN

0304-8853

e-ISSN

—

Svazek periodika

427

Číslo periodika v rámci svazku

April 1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

245-250

Kód UT WoS článku

000397199400044

EID výsledku v databázi Scopus

2-s2.0-85005993324