Effect of air annealing on properties of maghemite nanoparticles produced by radiation-chemical methodn

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F23%3A00574239" target="_blank" >RIV/68081723:_____/23:00574239 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0272884223013275?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0272884223013275?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ceramint.2023.05.080" target="_blank" >10.1016/j.ceramint.2023.05.080</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of air annealing on properties of maghemite nanoparticles produced by radiation-chemical methodn

Popis výsledku v původním jazyce

Amorphous-crystalline nanoparticles (NPles) of maghemite (gamma-Fe2O3) were successfully prepared by a radiation-chemical method using a precursor-heptahydrate of iron (II) sulfate. Synthesized NPles were quasi-spherical agglomerates 200-300 nm in size with an uneven surface covered with thin, porous, randomly oriented, elongated plates of irregular shape, with sharp vertices. The amorphous component of NPles included ultra-fine NPles maghemite about 2 nm in size. Stepwise annealing of the original nanopowder (NP) in air showed a phase transformation of NPles along the following path: maghemite + amorph (RT-150 degrees C) -> amorph (200-500 degrees C) -> hematite (570-1050 degrees C). The hematite NP produced after annealing at a temperature of 575 degrees C showed good texture characteristics: the specific surface area (SSA) increased from 21 to 36.8 m(2)/g, the pore volume increased from 0.04 to 0.15 cm(3)/g, while maintaining the particle nanosize of not more than 38 nm. X-ray photoelectron spectroscopy (XPS) showed the presence of the following elements on the surface of the synthesized NPles -S, C, O, Fe and N (N only in the original sample S0) and increased O-Fe bond with an increase in annealing temperature. The paramagnetic properties of the studied NPles indicate the prospect of their use as contrast agents in magnetic resonance imaging (MRI).

Název v anglickém jazyce

Effect of air annealing on properties of maghemite nanoparticles produced by radiation-chemical methodn

Popis výsledku anglicky

Amorphous-crystalline nanoparticles (NPles) of maghemite (gamma-Fe2O3) were successfully prepared by a radiation-chemical method using a precursor-heptahydrate of iron (II) sulfate. Synthesized NPles were quasi-spherical agglomerates 200-300 nm in size with an uneven surface covered with thin, porous, randomly oriented, elongated plates of irregular shape, with sharp vertices. The amorphous component of NPles included ultra-fine NPles maghemite about 2 nm in size. Stepwise annealing of the original nanopowder (NP) in air showed a phase transformation of NPles along the following path: maghemite + amorph (RT-150 degrees C) -> amorph (200-500 degrees C) -> hematite (570-1050 degrees C). The hematite NP produced after annealing at a temperature of 575 degrees C showed good texture characteristics: the specific surface area (SSA) increased from 21 to 36.8 m(2)/g, the pore volume increased from 0.04 to 0.15 cm(3)/g, while maintaining the particle nanosize of not more than 38 nm. X-ray photoelectron spectroscopy (XPS) showed the presence of the following elements on the surface of the synthesized NPles -S, C, O, Fe and N (N only in the original sample S0) and increased O-Fe bond with an increase in annealing temperature. The paramagnetic properties of the studied NPles indicate the prospect of their use as contrast agents in magnetic resonance imaging (MRI).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

<a href="/cs/project/GC21-31852J" target="_blank" >GC21-31852J: Vlastnosti nanoprášků připravených pulzním elektronovým svazkem při nízkém tlaku plynu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Ceramics International

ISSN

0272-8842

e-ISSN

1873-3956

Svazek periodika

49

Číslo periodika v rámci svazku

15

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

25414-25426

Kód UT WoS článku

001027058400001

EID výsledku v databázi Scopus

2-s2.0-85159195052