Hierarchial coassembly of a cyanine dye in poly(vinyl alcohol) fibrous films by electrospinning
| Autor: | Nesrin Horzum, Mustafa M. Demir, Serdar Özçelik, Bengisu Ozen |
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| Přispěvatelé: | TR130614, TR11372, TR7497, Demir, Mustafa M., Horzum, Nesrin, Özen, Bengisu, Özçelik, Serdar, Izmir Institute of Technology. Materials Science and Engineering, Izmir Institute of Technology. Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Vinyl alcohol
Auxiliary electrode Aggregates Photoluminescence Materials science Infrared 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Polymer chemistry Materials Chemistry Physical and Theoretical Chemistry Cyanine Fourier transform infrared spectroscopy Polyvinyl alcohols Aggregate (composite) Electrospinning 021001 nanoscience & nanotechnology 3. Good health 0104 chemical sciences Surfaces Coatings and Films Fibers chemistry Chemical engineering 0210 nano-technology |
| Popis: | We report molecular aggregate formation of TTBC (1,1′,3,3′- tetraethyl-5,5′,6,6′-tetrachlorobenzimidazolocarbocyanine) in submicrometer-sized PVA (poly(vinyl alcohol)) fibers by electrospinning. The formation of the molecular aggregate is examined by solution and instrumental parameters of electrospinning. The precursor solution of PVA/TTBC, in the range of 0.016-0.065 wt % is subjected to electrospinning under an electrical field ranging from 0.95 to 1.81 kV cm-1. Both randomly deposited and uniaxially aligned fibers are achieved by using two parallel-positioned metal strips as counter electrode. Photoluminescence and polarized Fourier transform infrared spectroscopies are employed to determine spectral properties of the fibers. H-aggregates are formed within the electrospun fibers, regardless of their alignment, and H- and J-type aggregates coexist in the alternative spin-coated and the cast films. A strongly polarized photoluminescence emission is observed in the direction of uniaxially aligned fibers as a result of the orientation of the H-aggregates along the fiber axis. We demonstrate that electrospinning is a process capable of forming and orienting TTBC aggregates during the structural development of the polymer/dye nanofibers. These fibrous films may potentially find applications in optics and electronics. TÜBİTAK TBAG-107T795 |
| Databáze: | OpenAIRE |
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