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题名: From Hollow Nanosphere to Hollow Microsphere: Mild Buffer Provides Easy Access to Tunable Silica Structure
作者: Liu, Jian1, 2;  Fan, Fengtao1, 2;  Feng, Zhaochi1;  Zhang, Lei1;  Bai, Shiyang1, 2;  Yang, Qihua1;  Li, Can1
通讯作者: 杨启华 ;  李灿
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2008-10-01
DOI: 10.1021/jp804161f
卷: 112, 期:42, 页:16445-16451
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 506,503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: A facile synthesis method for producing silica hollow spheres from nano- to microsize level is realized by adjusting the hydrolysis and condensation kinetics of silane precursors in a mild buffer solution (NaH2PO4-Na2HPO4, pH approximate to 7.0) in the presence of F127 (EO106PO70EO106) surfactant. Characterization using transmission electron microscopy, field-emission scanning electron microscopy, and nitrogen sorption techniques reveals that the silica hollow nanospheres with outer diameter of about 12 nm can be obtained with tetramethoxysilane as silane precursor. Silica hollow nanospheres (similar to 20 nm) can also be prepared using tetraethoxysilane (TEOS) as silane precursor with the addition of hydrolysis and condensation catalyst NH4F. Using TEOS as the silane precursor without F-, the formation of silica hollow microspheres (0.5 similar to 8 mu m) was observed. Time-resolved in situ UV-Raman results show that TEOS does not hydrolyze at room temperature, and the hydrolysis of TEOS occurs immediately at room temperature when NH4F was added to the buffer solution. The fast hydrolysis and condensation rates of silane precursor favor the formation of hollow nanospheres through the condensation of silicate around a single micelle of F127 in NaH2PO4-Na2HPO4 buffer solution. The construction of hollow microspheres is attributed to the formation of O/W emulsion by the hydrophobic TEOS with the aid of F127 surfactant due to the existence of unhydrolyzed TEOS at room temperature under current synthetic conditions.
关键词[WOS]: PERIODIC MESOPOROUS ORGANOSILICAS ;  IN-SITU ;  SONOCHEMICAL TREATMENT ;  FACILE SYNTHESIS ;  TEOS HYDROLYSIS ;  SPHERES ;  SHELL ;  PARTICLES ;  RAMAN ;  GEL
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000260129400048
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/100715
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, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Liu, Jian,Fan, Fengtao,Feng, Zhaochi,et al. From Hollow Nanosphere to Hollow Microsphere: Mild Buffer Provides Easy Access to Tunable Silica Structure[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2008,112(42):16445-16451.
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