Open Access Repository

Toward optimization of macroporous silica gels for application to capillary or microchip-based CEC and LC


Downloads per month over past year

Shrinivasan, S, Breadmore, MC, Hosticka, B, Landers, JP and Norris, PM 2004 , 'Toward optimization of macroporous silica gels for application to capillary or microchip-based CEC and LC' , Journal of Non-Crystalline Solids, vol. 350 , pp. 391-396 , doi: 10.1016/j.jnoncrysol.2004.06.028.

[img] PDF
027.pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.


Silica aerogels were prepared via the sol–gel process using tetramethoxysilane (TMOS) as the precursor and polyethylene oxide (PEO) of molecular weights 10,000 and 100,000 to provide a polymeric template for gelation. The experiments included eleven different formulations ranging from 100% 10,000 MW PEO to 100% 100,000 MW PEO in 10% increments. The total concentration of PEO was kept constant throughout the experiment. The gelation time of the wet-gel prepared using 10,000 MW PEO was 15.3 (±0.1) × 103 s, while gelation occurred almost 30 times faster by using long-chain 100,000 MW PEO. The surface area of aerogels prepared with 10,000 MW PEO was 40 m2 g−1 and that of 100,000 MW PEO aerogels was more than an order of magnitude larger. The Young’s modulus of 10,000 MW PEO aerogels was 1.2 (±0.3) MPa while that for 100,000 MW PEO aerogels was almost four times larger. Estimated pore sizes for all types of gels were in the macroporous region. The estimated pore sizes for 10,000 MW PEO were an order of magnitude greater than those estimated for 100,000 MW PEO. The physical properties of silica aerogels such as gelation time, pore size, surface area, and Young’s modulus can be tailored to make them suitable for application as separation media in HPLC and CEC.

Item Type: Article
Authors/Creators:Shrinivasan, S and Breadmore, MC and Hosticka, B and Landers, JP and Norris, PM
Journal or Publication Title: Journal of Non-Crystalline Solids
ISSN: 0022-3093
DOI / ID Number: 10.1016/j.jnoncrysol.2004.06.028
Additional Information:

The definitive version is available online at

Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page