Influence of constant magnetic field on aggregation processes in magnetite colloids

16th Russian Youth Conference on Physics and Astronomy

物理学;天文学

Gareev, K.G.^1 ; Kononova, I.E.^1 ; Levitckii, V.S.^1 ; Moshnikov, V.A.^1 ; Nalimova, S.S.^1

Saint-Petersburg Electrotechnical University LETI, 5 Popova Str., Saint-Petersburg

197376, Russia^1

关键词: Aggregation process;    Applied magnetic fields;    Constant magnetic fields;    Laser power;    Linear structures;    Threshold-value;    Two-stage;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/572/1/012027/pdf
DOI  :  10.1088/1742-6596/572/1/012027

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Colloids of Fe3O4/SiO2nanoparticles derived by a two-stage technique on the base of tetraetoxisilane soles were studied. Phase composition of the particles was analyzed by X-ray diffraction and Raman spectroscopy. It was found that phase transition of Fe3O4into α-Fe2O3occurs at a laser power exceeding a threshold value. The aggregation of the particles to linear structures in a constant magnetic field was studied by atomic force microscopy. The data on the change in resistance of Fe3O4/SiO2colloids under an applied magnetic field were obtained.