SAXS investigations on the fractal characteristic of SiO2-Al2O3 xerogels

Fei He; Xiao Dong He; Ming Wei Li

SAXS investigations on the fractal characteristic of SiO₂-Al₂O₃ xerogels

Fei He^*
, Xiao Dong He
, Ming Wei Li

^*Corresponding author for this work

School of Astronautics

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

Low-density xSiO₂-(10-x) Al₂O₃ xerogels with x=0.9, 0.8, 0.7 and 0.6 (mole fractions) were prepared by sol-gel and non-supercritical drying. Silica alkogels, which were the network supports of binary composite materials, formed from TEOS by hydrolytic condensation with a molar ratio of TEOS:H₂O: alcohol: HCl: ammonia=1:4:7:7.5 × 10^-4:0.0375. Aluminum hydroxide derived from Al(NO₃)₃ and NH₄OH acting in the alcohol solution under the condition of catalysts. The fractal characteristic of SiO₂-Al₂O₃ xerogels with different aluminum content and 6SiO₂-4Al₂O₃ ones under different heat treatment temperature was investigated by means of small-angle X-ray scattering (SAXS). The results show that mass fractal range of SiO₂-Al₂O₃ xerogels increases and colloid particle decreases with the increase of aluminum content and the size of colloid particles are between 14 nm and 16 nm. For the SiO₂-Al₂o₃ xerogels of 40% aluminum content, fractal particle range is increased with the increase of temperature.

Original language	English
Pages (from-to)	790-793
Number of pages	4
Journal	Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology
Volume	39
Issue number	5
State	Published - May 2007

Keywords

Fractal dimension
Porous structure
SAXS method
Silica-alumina xerogels

Cite this

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title = "SAXS investigations on the fractal characteristic of SiO2-Al2O3 xerogels",

abstract = "Low-density xSiO2-(10-x) Al2O3 xerogels with x=0.9, 0.8, 0.7 and 0.6 (mole fractions) were prepared by sol-gel and non-supercritical drying. Silica alkogels, which were the network supports of binary composite materials, formed from TEOS by hydrolytic condensation with a molar ratio of TEOS:H2O: alcohol: HCl: ammonia=1:4:7:7.5 × 10-4:0.0375. Aluminum hydroxide derived from Al(NO3)3 and NH4OH acting in the alcohol solution under the condition of catalysts. The fractal characteristic of SiO2-Al2O3 xerogels with different aluminum content and 6SiO2-4Al2O3 ones under different heat treatment temperature was investigated by means of small-angle X-ray scattering (SAXS). The results show that mass fractal range of SiO2-Al2O3 xerogels increases and colloid particle decreases with the increase of aluminum content and the size of colloid particles are between 14 nm and 16 nm. For the SiO2-Al2o3 xerogels of 40\% aluminum content, fractal particle range is increased with the increase of temperature.",

keywords = "Fractal dimension, Porous structure, SAXS method, Silica-alumina xerogels",

author = "Fei He and He, \{Xiao Dong\} and Li, \{Ming Wei\}",

year = "2007",

month = may,

language = "英语",

volume = "39",

pages = "790--793",

journal = "Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology",

issn = "0367-6234",

publisher = "Harbin Institute of Technology",

number = "5",

}

TY - JOUR

T1 - SAXS investigations on the fractal characteristic of SiO2-Al2O3 xerogels

AU - He, Fei

AU - He, Xiao Dong

AU - Li, Ming Wei

PY - 2007/5

Y1 - 2007/5

N2 - Low-density xSiO2-(10-x) Al2O3 xerogels with x=0.9, 0.8, 0.7 and 0.6 (mole fractions) were prepared by sol-gel and non-supercritical drying. Silica alkogels, which were the network supports of binary composite materials, formed from TEOS by hydrolytic condensation with a molar ratio of TEOS:H2O: alcohol: HCl: ammonia=1:4:7:7.5 × 10-4:0.0375. Aluminum hydroxide derived from Al(NO3)3 and NH4OH acting in the alcohol solution under the condition of catalysts. The fractal characteristic of SiO2-Al2O3 xerogels with different aluminum content and 6SiO2-4Al2O3 ones under different heat treatment temperature was investigated by means of small-angle X-ray scattering (SAXS). The results show that mass fractal range of SiO2-Al2O3 xerogels increases and colloid particle decreases with the increase of aluminum content and the size of colloid particles are between 14 nm and 16 nm. For the SiO2-Al2o3 xerogels of 40% aluminum content, fractal particle range is increased with the increase of temperature.

AB - Low-density xSiO2-(10-x) Al2O3 xerogels with x=0.9, 0.8, 0.7 and 0.6 (mole fractions) were prepared by sol-gel and non-supercritical drying. Silica alkogels, which were the network supports of binary composite materials, formed from TEOS by hydrolytic condensation with a molar ratio of TEOS:H2O: alcohol: HCl: ammonia=1:4:7:7.5 × 10-4:0.0375. Aluminum hydroxide derived from Al(NO3)3 and NH4OH acting in the alcohol solution under the condition of catalysts. The fractal characteristic of SiO2-Al2O3 xerogels with different aluminum content and 6SiO2-4Al2O3 ones under different heat treatment temperature was investigated by means of small-angle X-ray scattering (SAXS). The results show that mass fractal range of SiO2-Al2O3 xerogels increases and colloid particle decreases with the increase of aluminum content and the size of colloid particles are between 14 nm and 16 nm. For the SiO2-Al2o3 xerogels of 40% aluminum content, fractal particle range is increased with the increase of temperature.

KW - Fractal dimension

KW - Porous structure

KW - SAXS method

KW - Silica-alumina xerogels

UR - https://www.scopus.com/pages/publications/34347270130

M3 - 文章

AN - SCOPUS:34347270130

SN - 0367-6234

VL - 39

SP - 790

EP - 793

JO - Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology

JF - Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology

IS - 5

ER -

SAXS investigations on the fractal characteristic of SiO₂-Al₂O₃ xerogels

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Keywords

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