Ultrafast Hydrothermal Synthesis of High Quality Magnetic Core Phenol鈥揊ormaldehyde Shell Composite Microspheres Using the Microwave Method

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• 作者：Li-Jun You ; Shuai Xu ; Wan-Fu Ma ; Dian Li ; Yu-Ting Zhang ; Jia Guo ; Jack J. Hu ; Chang-Chun Wang
• 刊名：Langmuir
• 出版年：2012
• 出版时间：July 17, 2012
• 年：2012
• 卷：28
• 期：28
• 页码：10565-10572
• 全文大小：444K
• 年卷期：v.28,no.28(July 17, 2012)
• ISSN：1520-5827

文摘

An ultrafast, facile, and efficient microwave hydrothermal approach was designed to fabricate magnetic Fe₃O₄/phenol鈥揻ormaldehyde (PF) core鈥搒hell microspheres for the first time. The structure of the Fe₃O₄/PF core鈥搒hell microspheres could be well controlled by the in situ polycondensation of phenol and formaldehyde with magnetic Fe₃O₄ clusters as the seeds in an aqueous solution without any surfactants. The effect of synthetic parameters, such as the feeding amounts of phenol, the dosages of formaldehyde, the reaction temperatures, and the microwave heating time, on the morphologies and sizes of the Fe₃O₄/PF microspheres were investigated in details. The phenol鈥揻ormaldehyde shell is found to be evenly coated on Fe₃O₄ clusters within 10 min of the irradiation. The as-prepared microspheres were highly uniform in morphology, and the method was found to allow the shell thickness to be finely controlled in the range of 10鈥?00 nm. The properties of the composite microspheres were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetic analysis (TGA), Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). The as-prepared Fe₃O₄/PF microspheres were monodisperse and highly dispersible in water, ethanol, N,N-dimethyformamide, and acetone, a beneficial quality for the further functionalization and applications of the Fe₃O₄/PF microspheres.