Functional films made of environmentally friendly clay minerals and dyes

ScienceDaily | 5/17/2018 | Staff
kringkring (Posted by) Level 4
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Combining dyes with a wide range of natural minerals like clathrates (clays) and zeolites (porous rock) is a widely applied, promising strategy for creating hybrid materials that can interact with light, or "chromic" materials. The physical structure of these materials plays a key role; tiny, nanometer-sized cavities play host to light-sensitive molecules which behave differently from when they are free in solution, with potential applications to light emitting devices, light harvesting (like in solar cells) and novel sensors. A team led by Prof Takuya Fujimura from the Department of Physics and Materials Science, Shimane University, and Prof Shinsuke Takagi from the Department of Applied Chemistry, Tokyo Metropolitan University, have created a transparent film made of an environmentally-friendly clay mineral and a dye, magnesium porphyrin, that changes color in response to humidity.

What makes this film special is the mechanism by which it achieves such a striking change. Clays have a layered structure, with nanometer-scale thin spaces in between. The team made a technical breakthrough in getting the dye into these gaps without...
(Excerpt) Read more at: ScienceDaily
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