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J Colloid Interface Sci. 2011 Dec 15;364(2):428-34. doi: 10.1016/j.jcis.2011.08.078. Epub 2011 Sep 3.

Polydiacetylene-supported silica films formed at the air/water interface.

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  • 1Department of Chemistry and Ilse Katz Institute for Nanotechnology, Ben Gurion University, Beer Sheva 84105, Israel.


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.

Copyright © 2011 Elsevier Inc. All rights reserved.

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