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Improving conducting polymer electro...

Asemota, Chris I.

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Improving conducting polymer electrochromic speeds and depositing aligned polymeric nanofibers by electrospinning process.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Improving conducting polymer electrochromic speeds and depositing aligned polymeric nanofibers by electrospinning process./
Author:	Asemota, Chris I.
Description:	165 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-02, Section: B, page: 1039.
Contained By:	Dissertation Abstracts International71-02B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3393025
ISBN:	9781109598087

Improving conducting polymer electrochromic speeds and depositing aligned polymeric nanofibers by electrospinning process.
Asemota, Chris I.

Improving conducting polymer electrochromic speeds and depositing aligned polymeric nanofibers by electrospinning process. - 165 p.

Source: Dissertation Abstracts International, Volume: 71-02, Section: B, page: 1039.

Thesis (Ph.D.)--University of Connecticut, 2009.

The effects of film thickness and porosity on electrochromic switching time of conducting polymers was pursued to determine the morphology influence on ions transport during oxidation step of the redox process, affording sub-second or seconds switching times.

ISBN: 9781109598087Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Improving conducting polymer electrochromic speeds and depositing aligned polymeric nanofibers by electrospinning process.
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020 $a 9781109598087
035 $a (UMI)AAI3393025
035 $a AAI3393025
040 $a UMI $c UMI
100 1 $a Asemota, Chris I. $3 1675013
245 1 0 $a Improving conducting polymer electrochromic speeds and depositing aligned polymeric nanofibers by electrospinning process.
300 $a 165 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-02, Section: B, page: 1039.
500 $a Adviser: Gregory A. Sotzing.
502 $a Thesis (Ph.D.)--University of Connecticut, 2009.
520 $a The effects of film thickness and porosity on electrochromic switching time of conducting polymers was pursued to determine the morphology influence on ions transport during oxidation step of the redox process, affording sub-second or seconds switching times.
520 $a Electrospinning technique provided non-woven nanofiber mats, while spin coating and electropolymerization of monomer (N3T) provided films. Porosity decreased as depositing method changed from electrospinning to spin coating. In electrochemical oxidation, the electrons leave the polymer at the metal electrode-polymer film interface, and counter ions arrive at the polaron-bipolaron sites left in the polymer, through polymer-electrolyte interface. Counter ion diffusion in conducting polymers are film thickness limited at increasing thickness and inability of ions to reach holes sites on the oxidizing polymer accounts for long switching speeds, introducing extensive and micro pores and high surface areas should lead to decreasing electrochromic switching speed to single digit time in seconds (for display and vision applications), while increasing the maximum optical switching contrast due to increased fiber mat thicknesses.
520 $a Photolithographic patterning of nanofiber mats of the conducting polymer precursor having photo cross-linking unit was also explored. The photo-crosslinkable polymer was prepared by including norborene methacrylate (NMA) units to the polymer backbone during precursor polymerization, yielding a terpolymer poly(N3T-NA-NMA). The influence of photo crosslinking on electrochemical switching in conducting polymer nanofibers, and effect of developing parameters (solvent and time) on pattern transfer to the nanofiber mat was investigated and showed no influence on the electrochemical redox of the polymer. Solvents suitable for dissolving the polymer were investigated as developers with results showing non-differentiable pattern transfer for all suitable solvents, and no net preference to solvent choice.
520 $a Lastly, the alignment of electrospun nanofibers during electrospinning was investigated to prepare composites of aligned nanofiber mats on macro-mesh fabric, and control alignment by non-conventional methods. Nanofibers produced during electrospinning are usually collected as non-woven randomly oriented fibers, but by manipulating the electric field at the collector, aligned nanofibers were obtained. Further modifications using a mesh fabric as collector, or using non-conventional conductive surfaces, deposition of continuous and aligned nanofibers of poly lactic acid was achieved.
590 $a School code: 0056.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Nanoscience. $3 587832
650 4 $a Nanotechnology. $3 526235
690 $a 0495
690 $a 0565
690 $a 0652
710 2 $a University of Connecticut. $3 1017435
773 0 $t Dissertation Abstracts International $g 71-02B.
790 1 0 $a Sotzing, Gregory A., $e advisor
790 $a 0056
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3393025