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题名: Synthesis and shape evolution of monodisperse basic magnesium carbonate microspheres
作者: Zhang, Zhiping;  Zheng, Yajun;  Zhang, Jixiu;  Zhang, Qing;  Chen, Jiping;  Liu, Zhongmin;  Liang, Xinmiao
通讯作者: 陈吉平 ;  梁鑫淼
刊名: CRYSTAL GROWTH & DESIGN
发表日期: 2007-02-01
DOI: 10.1021/cg060544y
卷: 7, 期:2, 页:337-342
收录类别: SCI
文章类型: Article
部门归属: 1,18,8
项目归属: 103,1803,803
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Crystallography ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Crystallography ;  Materials Science
英文摘要: A self-assembled spherical-like basic magnesium carbonate (Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O) with diameters of 15-17 mu m was synthesized in an aqueous solution system without using any organic additives during the precipitation process. Reaction parameters such as reaction time, stirring time, and reaction temperature were found to be important in controlling the final morphology of Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O. By the investigation of the particles from time-dependent experiments, scanning electron microscopy observations and Fourier transform infrared spectra indicate that the formation of these spherical-like Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O is via a complex process, in which the agglomerates built by many fine grains are first produced after the "burst" mixture of K2CO3 and Mg(NO3)(2) solutions. Then the agglomerates tend to assemble into needlelike or other similar particles, and the latter, due to their unstable properties from the thermodynamic point of view, will transfer into sheetlike particles, which further assemble into spherical-like particles. During such a process, their corresponding compositions also change from (MgCO3)(0.8)(Mg(OH)(2))(0.2)center dot 1.3H(2)O to MgCO3 center dot xH(2)O, then to Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O. In addition, the stirring time and reaction temperature were found to play a comparative role in determining the final morphology of Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O, and the morphology transition from spherical-like to nest-like, then to layered particles, as well as the decrease of particle size, can be well obtained by carefully adjusting the stirring time (0.5-4 min) of the initial solution and reaction temperature (333-363 K).
关键词[WOS]: FT-IR ANALYSIS ;  PARTICLES ;  PRECIPITATION ;  NESQUEHONITE ;  SURFACE ;  SILICA
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000244000200030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99179
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Liaoning Normal Univ, Inst Chem Functionalized Mat, Dept Chem, Dalian 116029, Peoples R China

Recommended Citation:
Zhang, Zhiping,Zheng, Yajun,Zhang, Jixiu,et al. Synthesis and shape evolution of monodisperse basic magnesium carbonate microspheres[J]. CRYSTAL GROWTH & DESIGN,2007,7(2):337-342.
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