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题名: Nanoscale observation of morphological transformation during ageing of silica and silica-alumina
作者: Yao, Nan;  Yeung, King Lun;  Xiong, Guoxing
关键词: AFM ;  sol-gel ;  silica-alumina ;  particle growth
刊名: JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
发表日期: 2006-08-01
DOI: 10.1007/s10971-006-7144-1
卷: 39, 期:2, 页:139-150
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Materials Science, Ceramics
研究领域[WOS]: Materials Science
英文摘要: Atomic force microscopy (AFM) was used for in-situ observation of nanoscale morphological transformations during the ageing step in sol-gel synthesis. Silica, alumina and silica-alumina samples with different Si/Al ratios were prepared from inorganic salt precursors and geled at low pH. Silica and silica-alumina samples formed branch-like gel network made of nanometer-sized clusters. During ageing at room temperature, the overall structure of the gel network remained unchanged but the clusters underwent phase transformation, coaslesence, coarsening, fragmentation, as well as dissolution resulting in the internal restructuring of the gel material. Morphological transformation associated with crystallization of pseudo-boehmite phase was observed for the alumina samples. These nanometer-scale processes are expected to play a key role in dictating the material properties of the final sol-gel product.
关键词[WOS]: ANGLE NEUTRON-SCATTERING ;  ATOMIC-FORCE MICROSCOPY ;  X-RAY-SCATTERING ;  SOL-GEL ;  CATALYSTS ;  GELATION ;  NANOCOMPOSITES ;  AGGREGATION ;  POLYPYRROLE ;  SPHERULITES
语种: 英语
WOS记录号: WOS:000239812800009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140305
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.Hong Kong Univ Sci & Technol, Dept Chem Engn, Kowloon, Hong Kong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Yao, Nan,Yeung, King Lun,Xiong, Guoxing. Nanoscale observation of morphological transformation during ageing of silica and silica-alumina[J]. JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY,2006,39(2):139-150.
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