Nov. 4, 2013 — University of Helsinki researchers have manufactured photochemically active polymers which can be dissolved in water or certain alcohols. The new soluble, photosensitive polymer was created by doctoral student Szymon Wiktorowicz.
In the study, a 365-nm laser was aimed at a solution into which the polymer was partially dissolved. When exposed to light, the polymer switched to its cis conformation, dissolving completely and leaving a clear form which was visible in the cloudy solution.
The polymer chain created byWiktorowicz includes azo compounds which can be switched from a trans conformation to a cis conformation using light. As the two conformations are different in solubility, a ray of light can "draw" in an ethanol-based dispersion of the polymer. The switch from trans to cis happens in the entire polymer chain.
The research project was financially fully supported by the Academy of Finland.
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