NDLI: Fractal Characteristic of Silica Xerogels with Different Additives

Content Provider	IEEE Xplore Digital Library
Author	Fei He Xiaodong He Yao Li
Copyright Year	2006
Description	Author affiliation: Center for Composite Mater., Harbin Inst. of Technol. (Fei He; Xiaodong He; Yao Li)
Abstract	Two step acid-base catalyzed silica xerogels which had integrated structure were prepared through sol-gel and ambient pressure drying. Silica xerogels powder, $TiO_{2}$ powder and short fibers were added as the additives in order to improve the properties of silica xerogels. The porous structure was estimated by the means of nitrogen adsorption method and mercury intrusion porosimetry (MIP). According to the results of these two experiments, the surface fractal dimensions were calculated using Frenkel-Halsey-Hill (FHH) method, Menger sponge model and thermodynamic correlations respectively. The difference among them was compared and the influence of additives for pore structure also was analyzed combining with the fractal dimensions. The fractal dimensions exhibit the degree of surface roughness. The strength of silica xerogels is increased by adding the additives, and the shrinkage is also restrained in the course of drying. The fractal dimensions calculated from FHH method and thermodynamic correlations have almost same tendencies. These two models are more appropriate to analyze the porous fractal structures than Menger sponge model
Starting Page	1272
Ending Page	1275
File Size	4357844
Page Count	4
File Format	PDF
ISBN	1424401399
DOI	10.1109/NEMS.2006.334713
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-01-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fractals Silicon compounds Additives Powders Nitrogen Thermodynamics Equations Mechanical factors Surface fitting Helium mercury intrusion porosimetry silica xerogels fractal dimension nitrogen adsorption method
Content Type	Text
Resource Type	Article

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