Preparation of Uniform Hollow Spheres of Gd2O3 by Using Melamine-Formaldehyde Microspheres as Templates

doi:10.11901/1005.3093.2016.454

Chinese Journal of Materials Research

2017, Vol. 31

Issue (4): 285-290 DOI: 10.11901/1005.3093.2016.454

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Preparation of Uniform Hollow Spheres of Gd₂O₃ by Using Melamine-Formaldehyde Microspheres as Templates

Chi ZHANG, Gang SUN, Wenyi OUYANG, Huiting QIN, Donghui LI, Chu YAO, Xueliang JIANG(

)

School of Material Science and Engineering, Wuhan Institute of Technology,Wuhan 430074, China

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Chi ZHANG, Gang SUN, Wenyi OUYANG, Huiting QIN, Donghui LI, Chu YAO, Xueliang JIANG. Preparation of Uniform Hollow Spheres of Gd₂O₃ by Using Melamine-Formaldehyde Microspheres as Templates. Chinese Journal of Materials Research, 2017, 31(4): 285-290.

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Abstract

Monodispersed microspheres of melamine-formaldehyde (MF) was fabricated by polycondensation crosslinking process with aqueous solution of melamine and formaldehyde as raw material. Then the core-shell structure precursor of composite microspheres MF/Gd(OH)CO₃ was prepared by a urea-based homogeneous precipitation technique with MF microspheres as templates. Finally hollow microspheres of Gd₂O₃ were obtained by calcination of the MF/Gd(OH)CO₃ to remove tempaltes. The morphology and structure of the hollow microspheres Gd₂O₃ were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractomater (XRD), X-ray energy dispersive spectroscopy (XPS), thermal gravimetric analysis (TG) and differential scanning calorimetry (DSC). The results show that the MF templates can be effectively removed and the amorphous precursor of composite microspheres MF/Gd(OH)CO₃ has converted to crystalline Gd₂O₃ during the annealing progress. The generated hollow spheres of Gd₂O₃ possess particle size of about 2.4 μm and shell thickness of 120 nm.

Key words: inorganic non-metallic materials melamine formaldehyde template hollow spheres gadolinium oxide

Received: 01 August 2016

ZTFLH:

TB383

Fund: Supported by National Natural Science Foundation of China (No.51273154), College President Fundation of Wuhan Institute of Technology (No.CX2015085) and Graduate Student Education Innovation Foundation of Wuhan Institute of Technology (No.CX2016003)

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	Articles by authors
	Chi ZHANG
	Gang SUN
	Wenyi OUYANG
	Huiting QIN
	Donghui LI
	Chu YAO
	Xueliang JIANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.454 OR https://www.cjmr.org/EN/Y2017/V31/I4/285

Fig.1 FT-IR spectra of MF templates (a),MF/Gd(OH)CO₃ composite microspheres (b) and Gd₂O₃ hollow microspheres (c) samples

Fig.2 TG patterns of MF templates (a),MF/Gd(OH)CO₃ composite microspheres (b) and Gd₂O₃ hollow microspheres (c) samples

Fig.3 DSC curves of MF/Gd(OH)CO₃ composite microspheres

Fig.4 XRD patterns of MF/Gd(OH)CO₃ composite microspheres (a) and Gd₂O₃ hollow microspheres (b) samples

Fig.5 XPS wide spectrum (a) and Gd 4d spectrum (b) of patterns of Gd₂O₃ hollow spheres

Fig.6 SEM images of MF templates (a),MF/Gd(OH)CO₃ composite microspheres (b) and Gd₂O₃ hollow spheres (c) samples

Fig.7 TEM images of MF/Gd(OH)CO₃ composite microspheres (a, b) and Gd₂O₃ hollow spheres (c, d) samples

Fig.8 Preparation process chart of Gd₂O₃ hollow spheres

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