Functional Hybrid Glass that Generates Huge Acoustic Wave; Novel Nanostructure Patterns
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Functional Hybrid Glass Generates Huge Acoustic Wave; Novel Nanostructure Patterns Kyung M. Choi Chemistry, University of California, Irvine, CA 92697, U. S. A.
ABSTRACT Alkylene-bridged hybrid glass doped with Cr/CrOx was developed by sol-gel polymerization. It shows unusual nanofringe patterns in TEM image. When laser beam goes through a solid media, density wave is linear since heat doesn’t decay through the media effectively in solid media. Interestingly, we observed a strong ‘acoustic response’ from alkylene-bridged hybrid glass doped with Cr/CrOx due to its high grating effect, high photo-acoustic diffraction efficiency. The acoustic response generated from the doped hybrid glass was as compressive as liquid and thus the acoustic refractive intensity generated from the hybrid glass was as strong as liquid. In our laser experiment, the diffraction efficiency (45 %) of the glass is higher than that of methanol (25 %). This novel hybrid glass can be used to develop diffraction beam modulators.
INTRODUCTION For developing optical or laser device materials, transparent components such as silica and polymers have been widely investigated. Polysilsesquioxanes are a class of molecular-level composites, which can be produced by a molecular-scale mixing technique. It was made by inserting organic fragments between two inorganic spacers to create a new polymeric network. Resulting composites obtained from a molecular mixing technique lose individuals’ identities after the molecular-level mixing then often creates entirely new properties that haven’t been shown in the individual element. For example, organic and inorganic hybrid glasses that were mixed in bulk scale still maintain their original properties of the individual organic or inorganic fragment, and the resulting properties are significantly influenced by the individual properties of each component and their domain sizes. In contrast, hybrid glasses that were mixed in the molecular scale often lose individual properties after mixing then creates new properties that each individual hasn’t shown. There are many researches to develop optoelectronic device materials based on bridged polysilsesquioxanes due to its good optical transparency and a potential of creating new optoelectronic properties by inserting functional fragments between inorganic oxides at the molecular-level hybridization [1-13].
In this study, we demonstrate a molecular design of polysilsesquioxanes then doped with Cr /CrOx to develop a novel laser device material, which shows a new optical property, which hitherto hasn’t been found. To examine the new optical property, we performed a laser analysis. o
EXPERIMENTS Synthesis of 1,6-bis(triethoxysilyl)hexane 1,6-Bis(triethoxy-silyl)hexane was prepared by following a reported procedure [14]. 1,5Hexadiene (12.3g, 0.15 mol) and triethoxy silane (54.1g, 0.33 mol) were added into a flask. After purging with N2 for 30 min, chloroplatinic acid (1 mL of 7.5 x 10-5 mol in ethanol) was injected into the flask using a syringe. The solution was
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