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Title: Preparation with a facile template-free method of uniform-sized mesoporous microspheres of rare earth (La, Ce, Pr, Nd) oxides

Abstract

Highlights: {yields} Mesoporous microspheres of light rare earth hydroxycarbonates and oxides were fabricated. {yields} The supersaturated urea has important effect on formation of mesoporous microspheres. {yields} The influences of [cation]/[urea] ratio and amount of water on the formation of spherical crystallites were discussed. -- Abstract: Mesoporous microspheres of light rare earth (La, Ce, Pr, Nd) hydroxycarbonates and oxides were successfully fabricated by a facile surfactant free hydrothermal method in supersaturated aqueous urea solution. The techniques of XRD, TEM, SEM, TG/DTA and N{sub 2} adsorption-desorption were employed to investigate the structure and formation process of mesoporous microspheres. It was revealed that supersaturated urea not only serve as a reactant and pH modifier in the reaction system but also guide the oriented assembly of hydroxycarbonate crystallites into microspheres by acting as a structure-directing agent. The microspheres of rare earth oxides could easily be obtained by simple calcination of corresponding hydroxycarbonates precursors without undergoing morphology changes. In addition, the influences of rare earth precursor and urea concentrations on the formation of microspheres were also investigated.

Authors:
; ; ; ;  [1];  [1]
  1. Key Lab for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 2002 37 (China)
Publication Date:
OSTI Identifier:
22210106
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 46; Journal Issue: 11; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ADSORPTION; DESORPTION; HYDROTHERMAL SYNTHESIS; MICROSPHERES; MICROSTRUCTURE; NANOSTRUCTURES; OXIDES; RARE EARTHS; SURFACTANTS; TRANSMISSION ELECTRON MICROSCOPY; UREA; X-RAY DIFFRACTION

Citation Formats

Ji, Pengfei, Xing, Mingyang, Bagwasi, Segomotso, Tian, Baozhu, Chen, Feng, and Zhang, Jinlong. Preparation with a facile template-free method of uniform-sized mesoporous microspheres of rare earth (La, Ce, Pr, Nd) oxides. United States: N. p., 2011. Web. doi:10.1016/J.MATERRESBULL.2011.07.027.
Ji, Pengfei, Xing, Mingyang, Bagwasi, Segomotso, Tian, Baozhu, Chen, Feng, & Zhang, Jinlong. Preparation with a facile template-free method of uniform-sized mesoporous microspheres of rare earth (La, Ce, Pr, Nd) oxides. United States. https://doi.org/10.1016/J.MATERRESBULL.2011.07.027
Ji, Pengfei, Xing, Mingyang, Bagwasi, Segomotso, Tian, Baozhu, Chen, Feng, and Zhang, Jinlong. 2011. "Preparation with a facile template-free method of uniform-sized mesoporous microspheres of rare earth (La, Ce, Pr, Nd) oxides". United States. https://doi.org/10.1016/J.MATERRESBULL.2011.07.027.
@article{osti_22210106,
title = {Preparation with a facile template-free method of uniform-sized mesoporous microspheres of rare earth (La, Ce, Pr, Nd) oxides},
author = {Ji, Pengfei and Xing, Mingyang and Bagwasi, Segomotso and Tian, Baozhu and Chen, Feng and Zhang, Jinlong},
abstractNote = {Highlights: {yields} Mesoporous microspheres of light rare earth hydroxycarbonates and oxides were fabricated. {yields} The supersaturated urea has important effect on formation of mesoporous microspheres. {yields} The influences of [cation]/[urea] ratio and amount of water on the formation of spherical crystallites were discussed. -- Abstract: Mesoporous microspheres of light rare earth (La, Ce, Pr, Nd) hydroxycarbonates and oxides were successfully fabricated by a facile surfactant free hydrothermal method in supersaturated aqueous urea solution. The techniques of XRD, TEM, SEM, TG/DTA and N{sub 2} adsorption-desorption were employed to investigate the structure and formation process of mesoporous microspheres. It was revealed that supersaturated urea not only serve as a reactant and pH modifier in the reaction system but also guide the oriented assembly of hydroxycarbonate crystallites into microspheres by acting as a structure-directing agent. The microspheres of rare earth oxides could easily be obtained by simple calcination of corresponding hydroxycarbonates precursors without undergoing morphology changes. In addition, the influences of rare earth precursor and urea concentrations on the formation of microspheres were also investigated.},
doi = {10.1016/J.MATERRESBULL.2011.07.027},
url = {https://www.osti.gov/biblio/22210106}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 11,
volume = 46,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2011},
month = {Tue Nov 15 00:00:00 EST 2011}
}