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Nanoporous detectors of monocyclic aromatic compounds and other pollutants

  • US 8,759,111 B2
  • Filed: 07/10/2009
  • Issued: 06/24/2014
  • Est. Priority Date: 07/11/2008
  • Status: Active Grant
First Claim
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1. A porous sol-gel material consisting essentially of:

  • units of one or more first polyalkoxysilane(s) selected from the following compounds;

    (chloromethyl)triethoxysilane;

    1,3-dimethyltetramethoxydisiloxane;

    ethyltrimethoxysilane;

    triethoxy(ethyl)silane;

    triethoxymethylsilane;

    triethoxy(vinyl)silane;

    trimethoxymethylsilane;

    trimethoxy(vinyl)silane;

    tetraethoxysilane and tetramethoxysilane (TMOS); and

    units of one or more second polyalkoxysilane(s) selected from the following compounds;

    (N-(3-(trimethoxysilyl)propyl)ethylenediamine;

    3-amino-propyltriethoxysilane (APTES) and 3-aminopropyltrimethoxysilane in a first polyalkoxy-silane(s)/second polyalkoxysilane(s) mole ratio of 1/0.01 to 1/1;

    wherein the porous sol-gel matrix is solid, self-standing and transparent to UV radiation; and

    wherein the sol-gel material is prepared according to a process comprising;

    mixing the first polyalkoxysilane(s), at a temperature of −

    25 to −

    15°

    C., with a water-miscible organic solvent therefor, thenadding a second polyalkoxysilane(s),adding water; and

    continuing stirring to obtain a sol and then the defined sol-gel.

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