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- SourceAvailable from: Kenji Kinashi[Show abstract] [Hide abstract]
ABSTRACT: Photorefractive performances of the composites using two kinds of photoconductive triphenylamine-based polymer have been compared and investigated. One polymer is poly(4-(diphenylamino)benzyl acrylate) (PDAA). The other is newly synthesized one of photoconductive acrylate polymer with methoxy substituted triphenylamine pendant, poly(4-((4-methoxyphenyl)(phenyl)amino)benzyl acrylate) (PMPAA). The methoxy substituent in PMPAA does not only shift the highest occupied molecular orbital (HOMO) level of the polymer, but also effectively enhances the chromophore orientation. Larger phase shift is confirmed by using the modified photoconductive polymer of PMPAA. The plasticizer of (4-(diphenylamino)phenyl)methanol (TPAOH) (IP = −5.64 eV) works as an effective trap in the PDAA (IP = −5.69 eV)-based composite, resulting in higher diffraction efficiency. Diffraction efficiency of 70% and fast response time of 25 ms (dominant) is measured at 532 nm under the moderate electric field of 45 V/μm.Journal of Photochemistry and Photobiology A Chemistry 10/2014; 291:26-33. DOI:10.1016/j.jphotochem.2014.06.008
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ABSTRACT: A novel adhesive hydrogel consisting of dextran and epsilon-poly(l-lysine) (dextran-PL) with multiple biomedical applications was developed. Periodate oxidation in aqueous media almost stoichiometrically introduces aldehyde groups in dextran molecules, and aldehyde dextran can react with the primary amino groups in epsilon-PL (ɛ-PL) at neutral pH to form a hydrogel. The gelation time of the hydrogel can be easily controlled by the extent of oxidation in dextran and of the acylation in ɛ-PL by anhydrides. The shear adhesion strength of dextran-PL was 10 times higher than that of fibrin glue, when wet collagen sheets were selected as test specimens. The cytotoxicity of aldehyde dextran and ɛ-PL were 1000 times lower than that of glutaraldehyde and poly(allylamine). The considerably low cytotoxicity of aldehyde dextran could be ascribed to its low reactivity with amine species when compared with glutaraldehyde. In contrast, a high reactivity of amino groups in ɛ-PL was observed when compared with glycine, l-lysine, and gelatin, which could be explained by their poor dissociation at neutral pH, thus leading to low cytotoxicity. © 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2013.Journal of Biomedical Materials Research Part A 08/2014; 102(8). DOI:10.1002/jbm.a.34923
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ABSTRACT: Here we demonstrated the fabrication of the two-dimensional structures by two-photon excitation of silver nitrate in poly(N-vinylpyrrolidone) matrix using a femtosecond laser. The obtained structures were analyzed by a scanning electron microscope, a micro X-ray diffractometer and an X-ray photoelectron spectroscope. An electrical conductivity of the structure was also measured. The structure is composed of silver and silver oxide, an electrical resistance of the structure shows six orders of magnitude higher than that of pure silver. However, deoxygenation with nitrogen from the solution before laser irradiation, which successfully fabricates the silver structures.Chemical Physics Letters 08/2014; 610. DOI:10.1016/j.cplett.2014.07.044
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