Novel Materials and Devices From Self-Assembled Periodic Structures.
Final technical rept. 1 Oct 92-30 Sep 95,
PITTSBURGH UNIV PA DEPT OF CHEMISTRY
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The research program developed novel mesoscopically periodic materials for use in novel optical devices such as optical limiters OL and switches. These materials are fabricated using the crystalline colloidal array CCA self assembly motif. We developed methods to polymerize CCA into hydrogel matrices to form rugged mesoscopic periodic arrays. We developed novel strategies to incorporate monodisperse CdS quantum dots in monodisperse ca. 100 nm colloidal spheres of SiO2 to form nonlinear materials for use in OL. This work also resulted in new high surface area porous SiO2 colloids with voids and chambers which should be useful in applications such as catalysis. We also developed a synthesis of monodisperse polymethylmethacrylate PMMA colloids containing covalently bound dye. These colloids form CCA which we polymerized in a hydrogel matrix. We matched the real part of the medium refractive index to that of the PMMA particles to form a periodic array which shows variations only in the imaginary part of the refractive index. We are utilizing this material for optical switching devices.
- Electrooptical and Optoelectronic Devices