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Influence of drying procedure on the mesoporosity and surface fractal dimensions of silica xerogels prepared with different agitation methods
Alternative TitleJ. Colloid Interface Sci.
Huang, WL; Cui, SH; Liang, KM; Gu, SR; Yuan, ZF
2002-02-01
Source PublicationJOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN0021-9797
Volume246Issue:1Pages:129-134
AbstractSilica xerogels were prepared by thermal drying wet gels in an electric oven (70degreesC) after certain duration of ambient drying, and the relevant effect is investigated on the mesopore structures and surface fractal dimensions of the resultant xerogels. The silica gels were derived from a hydrochloric acid-catalyzed TEOS (tetraethylorthaosilicate) system, and both magnetic stirring and ultrasonic vibration were adopted during Sol preparation. The percentage mesoporosity and surface fractal dimensions are evaluated using image analysis methods, based on FE-SEM (field emission gun-scanning electron microscopy) images. The results show that the mesoporosity of the resultant xerogels decreases with the duration of ambient drying for samples prepared using magnetic stirring and low-intensity ultrasonic vibration, while samples subjected to high-intensity ultrasound show a somewhat reverse trend. Samples prepared with magnetic stirring have almost constant surface fractal dimensions (nearly 3), irrespective of the ambient drying before thermal drying. The surface fractal dimensions of samples prepared using ultrasound increase with the duration of ambient drying. (C) 2002 Elsevier Science.; Silica xerogels were prepared by thermal drying wet gels in an electric oven (70degreesC) after certain duration of ambient drying, and the relevant effect is investigated on the mesopore structures and surface fractal dimensions of the resultant xerogels. The silica gels were derived from a hydrochloric acid-catalyzed TEOS (tetraethylorthaosilicate) system, and both magnetic stirring and ultrasonic vibration were adopted during Sol preparation. The percentage mesoporosity and surface fractal dimensions are evaluated using image analysis methods, based on FE-SEM (field emission gun-scanning electron microscopy) images. The results show that the mesoporosity of the resultant xerogels decreases with the duration of ambient drying for samples prepared using magnetic stirring and low-intensity ultrasonic vibration, while samples subjected to high-intensity ultrasound show a somewhat reverse trend. Samples prepared with magnetic stirring have almost constant surface fractal dimensions (nearly 3), irrespective of the ambient drying before thermal drying. The surface fractal dimensions of samples prepared using ultrasound increase with the duration of ambient drying. (C) 2002 Elsevier Science.
KeywordSol-gel Method Silica Xerogel Drying Ultrasound Porosity Surface Fractal Dimension
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1006/jcis.2001.8048
URL查看原文
Indexed BySCI
Language英语
WOS KeywordSELF-SIMILARITY ; AEROGELS ; POROSITY ; GELS ; SONOGELS ; MEDIA
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000173615300016
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5603
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Multiphase React Lab, Beijing 100080, Peoples R China
2.Tsing Hua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China
Recommended Citation
GB/T 7714
Huang, WL,Cui, SH,Liang, KM,et al. Influence of drying procedure on the mesoporosity and surface fractal dimensions of silica xerogels prepared with different agitation methods[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2002,246(1):129-134.
APA Huang, WL,Cui, SH,Liang, KM,Gu, SR,&Yuan, ZF.(2002).Influence of drying procedure on the mesoporosity and surface fractal dimensions of silica xerogels prepared with different agitation methods.JOURNAL OF COLLOID AND INTERFACE SCIENCE,246(1),129-134.
MLA Huang, WL,et al."Influence of drying procedure on the mesoporosity and surface fractal dimensions of silica xerogels prepared with different agitation methods".JOURNAL OF COLLOID AND INTERFACE SCIENCE 246.1(2002):129-134.
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