Tunable PhoXonic Band Gap Materials from Self-Assembly of Block Copolymers and Colloidal Nanocrystals (NBIT Phase II)
Final rept. 25 Jul 2011-24 Jul 2013
RICE UNIV HOUSTON TX
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The collaborative efforts were aimed at designing and fabricating tunable phoXonic band gap materials by self assembly of block copolymers 201BCP202. We also characterized both the structures and the resultant properties and made critical comparisons with simulations. The tunable properties of stimulus-responsive materials currently attract great interest in a variety of technological applications. Photonic gels are a new class of these materials that can be tuned to reflect different wavelengths of light. Controlling this reflected color via temperature-induced and solvent-quality induced changes of self-assembled photonic materials is important for their application in sensors and as displays. We found that the thermochromic behavior of a lamellar block copolymer polystyrene-b-2-vinylpyridine PS-P2VP photonic gel originated from a temperature-induced change in the pKa of the P2VP blocks. Control was obtained through the manipulation of the solution pH. The findings of this work provide the basis for understanding and controlling the properties of thermochromic block copolymers fostering their use in technologically relevant applications.
- Polymer Chemistry