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Recent Findings from Institute of Macromolecular Chemistry Has Provided New Information about Materials Science and Physical Chemistry (Star-Shaped...

September 5, 2014



Recent Findings from Institute of Macromolecular Chemistry Has Provided New Information about Materials Science and Physical Chemistry (Star-Shaped Molecules with Polyhedral Oligomeric Silsesquioxane Core and Azobenzene Dye Arms)

By a News Reporter-Staff News Editor at Science Letter -- New research on Science is the subject of a report. According to news originating from Kiev, Ukraine, by NewsRx correspondents, research stated, "We synthesized a series of hybrid nanomaterials combining organic dyes with polyhedral oligomeric silses-quioxanes (POSS) based on three different azobenzenes: monoazobenzene (4-phenylazophenol), bis-azobenzene (Disperse Yellow 7 and Fast Garnet derivative), and push pull azobenzene (Disperse Red 1) via hydrosilylation coupling. The azo-functionalized POSS compounds possess high thermal stability, and their branched architecture resulted in effective suppression of molecular aggregation and allowed for direct imaging of individual dye-POSS structures with expected molecular dimensions."

Our news journalists obtained a quote from the research from the Institute of Macromolecular Chemistry, "Stable, uniform, smooth, and ultrathin nanocomposite films with mixed silica organic composition and relatively low refractive indices can be fabricated from all azo-POSS branched conjugates. Finally, the photoisomerization behavior of POSS-conjugated 4-phenylazophenol was investigated in solution as well as in ultrathin nanocomposite film. We found that conjugation to POSS core did not affect the kinetics of trans-cis photoisomerization and thermal cis-trans relaxation. Furthermore, rapid and reversible photoisomerization was observed in azo-POSS nanocomposite films."

According to the news editors, the research concluded: "We suggest that the highly stable branched azo-POSS conjugates with high dye grafting density described here can be considered for nanometersized photoswitches, active layer material with optical-limiting properties, and a medium with photoinduced anisotropy for optical storage."

For more information on this research see: Star-Shaped Molecules with Polyhedral Oligomeric Silsesquioxane Core and Azobenzene Dye Arms. Langmuir, 2014;30(29):8856-8865. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)

The news correspondents report that additional information may be obtained from P.A. Ledin, Natl Academy Sci Ukraine, Inst Macromol Chem, UA-02160 Kiev, Ukraine. Additional authors for this research include I.M. Tkachenko, W.N. Xu, I. Choi, V.V. Shevchenko and V.V. Tsukruk (see also Science).

Keywords for this news article include: Kiev, Europe, Ukraine, Science

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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