Magnetite nanocrystal clusters transformed from ferric precursor and their colloidal magnetorheology

3rd International Conference on New Material and Chemical Industry

材料科学;化学工业

Abe, H.^1 ; Kuruma, K.^1 ; Murakami, T.^1 ; Takahashi, M.^1 ; Sato, K.^2 ; Naka, T.^3 ; Suzuki, Y.^4

Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka

567-0047, Japan^1

Graduate School of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma

376-8515, Japan^2

National Institute for Materials Science, 1-2-1 Sengen, Ibaraki Tsukuba

305-0047, Japan^3

Faculty of Pure and Applied Science, University of Tsukuba, 1-1-1 Tennodai, Ibaraki Tsukuba

305-8573, Japan^4

关键词: Average diameter;    Crystallographic orientations;    Iron species;    Magneto-rheology;    Potassium acetate;    Responsive materials;    Time-resolved;    Transformation pathways;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/479/1/012043/pdf
DOI  :  10.1088/1757-899X/479/1/012043

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Spherical magnetite (Fe3O4) nanocrystal clusters (MNCs) were synthesized via reductive aging of ferric precursor (FeCl3•6 H2O) in ethylene glycol (EG) in the presence of potassium acetate (KOAc). EG was used both as a reducing agent and a solvent. The as-synthesized MNCs with an average diameter of ∼500nm comprised Fe3O4 nanocrystals with almost equal crystallographic orientation. The time-resolved evolution of the iron species was tracked, and the MNC transformation pathway from the ferric precursor in the solution was deduced. Moreover, to examine the feasibility of MNCs for a field-responsive material, magnetorheology was investigated for the MNC-dispersed colloid.