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学科主题: 药学
题名:
Crystallization in Aggregates of Calcium Phosphate Nanocrystals: A Logistic Model for Kinetics of Fractal Structure Development
作者: Bian, Sha1; Du, Lin-Wei1; Gao, Yu-Xi2; Huang, Jian1; Gou, Bao-Di1; Li, Xiuhong3; Liu, Yi3; Zhang, Tian-Lan1; Wang, Kui1
刊名: CRYSTAL GROWTH & DESIGN
发表日期: 2012-07-01
DOI: 10.1021/cg2016885
卷: 12, 期:7, 页:3481-3488
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Chemistry, Multidisciplinary ; Crystallography ; Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ; Crystallography ; Materials Science
关键词[WOS]: SMALL-ANGLE SCATTERING ; RESOLVED IN-SITU ; MASS FRACTALS ; PORODS LAW ; NUCLEATION ; SURFACE ; APATITES ; GROWTH ; TRANSFORMATION ; PARTICLES
英文摘要:

Calcium phosphate crystallization is of importance in medicine and materials science, and aggregation frequently happens at its early stage. Herein, we report a kinetic study of crystallization in particles of aggregated nanocrystals of calcium phosphate by in situ synchrotron small-angle X-ray scattering. The particles were random fractal aggregates, having diameters of 20-60 nm and comprising structural units of 2.5 nm in dimension. With the application of a logistic model, the structural changes of the particles were characterized by the successive developments of mass and surface fractal dimensions. The rate constant of mass fractal development was found to be 0.052 h(-1), corresponding to the generation of crystallites on the pre-existing seeds inside an aggregate. These newly formed nanocrystals then detached from their seeds and fell into the voids. Afterward, the surface fractal structure developed at a rate of 0.11 h(-1), making the particle surface less rough. During this period, a transition layer of 1.2-nm thickness emerged between a particle and the surrounding solution. Our findings present an advance toward understanding the crystallization in particles of aggregated nanocrystals and would be beneficial for preparing nanocrystals and recognizing the roles of other substances (such as proteins and metals) in both biological and synthetic systems.

语种: 英语
所属项目编号: 21071007
项目资助者: National Natural Science Foundation of China
WOS记录号: WOS:000305919700018
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/59470
Appears in Collections:北京大学药学院_化学生物学系_期刊论文

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作者单位: 1.Peking Univ, Dept Biol Chem, Sch Pharmaceut Sci, Beijing 100191, Peoples R China
2.Chinese Acad Sci, Inst High Energy Phys, Key Lab Nucl Analyt Tech, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

Recommended Citation:
Bian, Sha,Du, Lin-Wei,Gao, Yu-Xi,et al. Crystallization in Aggregates of Calcium Phosphate Nanocrystals: A Logistic Model for Kinetics of Fractal Structure Development[J]. CRYSTAL GROWTH & DESIGN,2012,12(7):3481-3488.
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