Abstract
Hybrid organic–inorganic membranes were prepared by size exclusion deposition of fluorescent, octylene-bridged polysilsesquioxanes (OBP) nanoparticles onto ceramic membrane supports. Acid-catalyzed, sol-gel polymerization of 1,8-bis(triethoxysilyl)octane (BESO) was shown by dynamic light and scattering electron microscopy to afford spherical nanoparticles that, after 3–4 weeks, were sufficiently large enough to block the pores in porous, ceramic membranes with a 1.5nm cut-off. The OBP particles were deposited by drawing a low concentration sol through the ceramic membrane. The OBP particles blocked the pores with an intractable, tightly packed layer 3μm in thickness. The efficacy of size exclusion deposition was verified by incorporation of small amounts of a fluorescent, dansyl co-monomer into the particles and inspection of the membrane cross section by confocal fluorescence microscopy.
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