Nanomaterial-based Bacterial Sensors
    167.
    发明申请

    公开(公告)号:US20200158642A1

    公开(公告)日:2020-05-21

    申请号:US16491960

    申请日:2018-03-27

    Abstract: This invention relates to a sensor that detects bacteria cells comprising (a) a primary negatively charged, nanoparticulate sensing material; (b) a secondary positively charged, fluorescent sensing material; (c) a housing; and (d) at least one illuminator; wherein said housing contains said primary negatively charged, nanoparticulate sensing material, said secondary positively charged fluorescent sensing material and a sample potentially comprising bacteria in aqueous medium, wherein said illuminator provides light of at least one pre-specified wavelength λi to excite at least said secondary positively charged, fluorescent material, wherein said secondary positively charged, fluorescent material electrostatically attached to bacteria cells provides at least one fluorescent response at a second different wavelength λn wherein both i and n are integers, wherein said negatively charged, nanoparticulate sensing material electrostatically attached to said fluorescent material suppresses fluorescing of said fluorescent material at said second wavelength λn; and wherein said housing permits illumination of the contents of said housing by said illuminator and wherein said housing further permits the detection of a fluorescent response at a second wavelength λn. The negatively charged material includes (dsDNA coated) spherical AuNPs and graphene oxide (GO). The positively charged fluorescent material includes water soluble cationic conjugated polyelectrolytes (COPE) or positively charged peptide/polymer labeled with fluorescence dye. The sensor makes use of the FRET phenomenon between the primary and secondary sensing materials. The sensor allows making a distinction between living and dead bacteria and can measure the total bacteria count. A method for detecting bacteria utilizing the sensor is another part of the invention.

    Layered silicate/polymer composite and a method of forming the same

    公开(公告)号:US10647860B2

    公开(公告)日:2020-05-12

    申请号:US14350057

    申请日:2012-10-04

    Abstract: The present invention relates to a method for forming a layered silicate/polymer composite, the composite comprising individual exfoliated silicate layers separated in a continuous polymer matrix, wherein the polymer is a hydrophobic polymer, the method comprising: exfoliating sheet silicate in water to form a silicate suspension; replacing the water in the silicate suspension by an organic solvent to form a silicate/organic solvent suspension; contacting the silicate/organic solvent suspension with a solution of a hydrophobic polymer precursor in an organic solvent to form a silicate/polymer precursor suspension; coating the silicate/polymer precursor suspension on a substrate; removing the organic solvents; curing the hydrophobic polymer precursor of the coating of the silicate/polymer precursor; and annealing the cured coating to form the layered silicate/polymer composite on the substrate.

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