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A novel route to prepare low-dielectric constant mesoporous SiO(2) films was reported. Silicate sols were prepared with the precursor of TEOS and template of CTAB catalyzed by hydrochloric acid. The films were prepared by dip-coating process. FTIR, XRD and AFM were employed to characterize the films. The dielectric constants were measured by impedance analysis apparatus. These films with dielectric constants smaller than 2.2 could be acquired by adjusting the concentration of CTAB and aging time.

A novel route to prepare low-dielectric constant mesoporous SiO2 films is reported in this paper. Silicate sols are prepared with the precursor TEOS and template CTAB catalyzed by hydrochloric acid. The films are prepared by dip-coating process. FTIIR, XRD and AFM are used to characterize the films. The dielectric constants are measured by impedance analysis apparatus. The films with dielectric constants smaller than 2.2 can be acquired by adjusting the concentration of CTAB and aging time.

Silica aerogels doped with ceramic fibers were prepared successfully via sol-gel process with polyethoxydisiloxanes (E-40) as the silicon source. Surface modification was used to realize ambient pressure drying. The morphology, pore structure, mechanical properties and thermal conductivity of the silica aerogels doped with ceramic fibers were investigated. The results show that the ceramic fibers were evenly distributed inside the silica aerogels to increase the mechanical property. The mechanical strength of the silica aerogels increases from 1.6 times 10 4 pa to 9.6 times 10 4 pa with the doping of 10% ceramic fibers, while the thermal conductivity is 0.029 w/mmiddotK at room temperature in air. The hydrophobic properties of the doped aerogels are improved a lot by surface modification.

Silica aerogel-fiber composites were prepared via a heat pressing process. Nonwoven fibers were distributed inside the silica aerogels as a composite to act as a supporting skeleton which increased the mechanical strength. The morphology, pore structure, benzene adsorption capacities of the silica aerogels and the composites were characterized. The results show that the silica aerogel-fiber composites have more excellent benzene adsorption capacities compared with the traditional absorbent materials. The saturated benzene-adsorption percentage of the composites has a direct relation with the silica aerogels weight per unit area and the saturated benzene-adsorption percentage of silica aerogels. The experimental results are in good agreement with those calculated by a special formula. The composite process has no influence on the porous structure of the silica aerogels.