Research output: Contribution to journal › Article › peer-review
Effect of air annealing on properties of maghemite nanoparticles produced by radiation-chemical method. / Ilves, V.G.; Pizúrová, N.; Korusenko, P.M.; Sokovnin, S. Yu; Balezin, M.E.; Gerasimov , A.S.; Uimin, M.A.; Zuev, M.G.; Vasin, A.A.
In: Ceramics International, Vol. 49, No. 15, 01.08.2023, p. 25414-25426.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Effect of air annealing on properties of maghemite nanoparticles produced by radiation-chemical method
AU - Ilves, V.G.
AU - Pizúrová, N.
AU - Korusenko, P.M.
AU - Sokovnin, S. Yu
AU - Balezin, M.E.
AU - Gerasimov , A.S.
AU - Uimin, M.A.
AU - Zuev, M.G.
AU - Vasin, A.A.
PY - 2023/8/1
Y1 - 2023/8/1
N2 - Amorphous-crystalline nanoparticles (NPles) of maghemite (γ-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 °C) →amorph (200–500 °C) →hematite (570–1050 °C). The hematite NP produced after annealing at a temperature of 575 °C showed good texture characteristics: the specific surface area (SSA) increased from 21 to 36.8 m2/g, the pore volume increased from 0.04 to 0.15 cm3/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).
AB - Amorphous-crystalline nanoparticles (NPles) of maghemite (γ-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 °C) →amorph (200–500 °C) →hematite (570–1050 °C). The hematite NP produced after annealing at a temperature of 575 °C showed good texture characteristics: the specific surface area (SSA) increased from 21 to 36.8 m2/g, the pore volume increased from 0.04 to 0.15 cm3/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).
KW - Maghemite and hematite nanoparticles
KW - Radiation-chemical method
KW - Annealing in air
KW - XPS
KW - Photoluminescence
KW - Magnetism
KW - DSC-TG
KW - Photocatalysis
UR - https://www.mendeley.com/catalogue/044658e1-5d44-390f-b65e-83ecc02fe694/
U2 - 10.1016/j.ceramint.2023.05.080
DO - 10.1016/j.ceramint.2023.05.080
M3 - Article
VL - 49
SP - 25414
EP - 25426
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 15
ER -
ID: 105348616