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Polydiacetylene-supported silica films formed at the air/water interface
- Demikhovsky, Yelena, Kolusheva, Sofiya, Geyzer, Margarita, Jelinek, Raz
- Journal of colloid and interface science 2011 v.364 no.2 pp. 428-434
- air, catalytic activity, fluorescence, microbial detection, polymers, sieving, silica, silicates
- Mesostructured silica films have attracted interest as potential platforms for sensing, molecular sieving, catalysis, and others. The fabrication of free-standing silica films on water, however, is challenging due to the need for scaffolding agents that would constitute effective templates. We describe the assembly of thin film at the air/water interface comprising quaternary silicates and polydiacetylene (PDA), a unique chromatic polymer forming two-dimensional conjugated networks, and the use of these films for biological sensing. PDA exhibits a dual role in the system—both as the amphiphilic matrix facilitating immobilization of the silicate colloidal units at the air/water interface and additionally a chromatic reporter that undergoes visible blue–red transitions, accompanied by fluorescence transformations, in the presence of analytes. We demonstrate the application of the silicate/PDA thin films for the detection of bacterial proliferation.