Composition and pH dependence on aggregation of SiO2–PVA suspension for the synthesis of porous SiO2–PVA nanocomposite

Hiroshi Ikeda, Shigeru Fujino

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Porous monolithic SiO2–poly(vinyl alcohol) (PVA) nanocomposites were fabricated by drying an SiO2–PVA suspension. Depending on the amount of added PVA and pH value of the suspension, the Brunauer–Emmett–Teller surface areas, total pore volumes, and mean pore radii of the (100 − x)SiO2–xPVA (x = 0, 10, 20, 30 wt%) nanocomposites were 102–313 m2 g−1, 0.61–1.42 cm3 g−1, and 8.1–14.7 nm, respectively. Some cracks were observed in the monolithic SiO2–PVA nanocomposite, affected by the pore size. To elucidate crack generation, the correlation between the dispersion/aggregation in the SiO2–PVA suspension and the pore size distribution of the nanocomposite was evaluated in terms of the added PVA amount and pH value. At x = 20 and pH 3, the SiO2 particles and PVA aggregated in the suspension. The preparation of crack-free monolithic SiO2–PVA nanocomposites was possible using the aggregated suspension owing to the low capillary force during drying because of the relatively large pores.

    Original languageEnglish
    Pages (from-to)1143-1149
    Number of pages7
    JournalJournal of Porous Materials
    Volume21
    Issue number6
    DOIs
    Publication statusPublished - Nov 15 2014

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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