title: Ferric Phosphate Hydroxide Microstructures Affect Their Magnetic Properties.
abstract: Uniformly sized and shape-controlled nanoparticles are important due to their applications in catalysis, electrochemistry, ion exchange, molecular adsorption, and electronics. Several ferric phosphate hydroxide (Fe4(OH)3(PO4)3) microstructures were successfully prepared under hydrothermal conditions. Using controlled variations in the reaction conditions, such as reaction time, temperature, and amount of hexadecyltrimethylammonium bromide (CTAB), the crystals can be grown as almost perfect hyperbranched microcrystals at 180 °C (without CTAB) or relatively monodisperse particles at 220 °C (with CTAB). The large hyperbranched structure of Fe4(OH)3(PO4)3 with a size of ∼19 μm forms with the "fractal growth rule" and shows many branches. More importantly, the magnetic properties of these materials are directly correlated to their size and micro/nanostructure morphology. Interestingly, the blocking temperature (T B) shows a dependence on size and shape, and a smaller size resulted in a lower T B. These crystals are good examples that prove that physical and chemical properties of nano/microstructured materials are related to their structures, and the precise control of the morphology of such functional materials could allow for the control of their performance.
authors.affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University Anyang, Henan, 455002, P. R. China.
authors.forename: Junhong
authors.initials: J
authors.lastname: Zhao
authors.affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University Anyang, Henan, 455002, P. R. China.
authors.forename: Youjuan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University Anyang, Henan, 455002, P. R. China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Run
authors.affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University Anyang, Henan, 455002, P. R. China.
authors.forename: Pengwei
authors.initials: P
authors.lastname: Li
authors.affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University Anyang, Henan, 455002, P. R. China.
authors.forename: Qifei
authors.initials: Q
authors.lastname: Guo
authors.affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University Anyang, Henan, 455002, P. R. China ; State Key Laboratory of Coordination Chemistry, Nanjing University Nanjing, Jiangsu, 210093, P. R. China.
authors.forename: Huan
authors.initials: H
authors.lastname: Pang
keywords: blocking temperature; ferric phosphate hydroxide; hydrothermal condition; magnetic properties; microstructures