Erdogan Teke

Complementary all Solid State Electrochromic Devices Using Carboxymethyl Cellulose Based Electrolytes

The paper presents the results of the research on a new polymer-membrane and gel electrolytes for electrochromic devices. A complementary solid-state electrochromic device consisting of cathodically coloring working electrode of WO3 and anodically coloring counter electrode of NiO films is prepared to compare the effects of gel or membrane forms of carboxymethyl cellulose (CMC) polymer electrolyte on the electrochromic properties of devices. The performance evaluations of the complementary solid-state electrochromic devices indicate good reversibility, low power consumption of ±3 V in colored state, high variation of transmittance changing of 64% in gel electrolyte, and lower 7% in membrane electrolyte and good memory effect under open-circuit conditions. CMC based electrolytes can be used as an ion-conducting medium and be a good candidate for complementary electrochromic devices owing to, the improved properties as well as its cheapness.

Combination of grey cotton fabric desizing and gassing treatments with a plasma aided process

In this study, corona plasma discharge was applied to desize polyvinyl alcohol (PVA) and starch on cotton fabrics. Plasma treated and non-treated samples were processed in various steps in a textile firm. The samples were tested to evaluate their weight loss, size dissolution, capillarity, dyeability, pilling resistance and strength values. The surface morphology and the chemical structures were examined by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy analyses. The experimental results showed that the plasma has positive effects on size removal, hydrophility and the pilling values of the PVA and also starch sized fabrics.

Comparatively plasma deposition of PEDOT thin films

PEDOT thin films has been widely using as electrode for variety areas because of its excellent chemical stability, low redox potential and high optical transparency in the doped states. Herein, we report that comparatively deposition of PEDOT thin film through microwave and radio frequency plasma onto ITO/glass substrate. The untreated EDOT monomer was evaporated from the outer reaction glass vessel and the substrate placed into pyrex chamber and computer-controlled plasma treatments were conducted. 2.45 GHz microwave plasma and 13.56 MHz radio frequency plasma radiations were used with continuous powers of 350 W and 50 W, respectively. Standardized experimental parameters were used and optical emission spectra (OES) were taken during the plasma process under vacuum conditions of 0.02 Torr. The deposited films were characterized by Fourier transform infrared (FTIR), Energy-dispersive X-ray Spectroscopy (EDS), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and electrical conductivities were measured by four-point probe technique. In this study, a comparison of physical properties of plasma deposited thin films is discussed. It is showed that plasma polymerization of PEDOT resulted as crosslinked structure and electrically conductive up to 10-5 S/cm.

RF plasma nanocoating of PEDOT onto chitosan powders for nanofiber applications

PEDOT (poly-3,4-ethylene dioxythiophene) is one of the most attractive polythiophene derivatives and has been studied intensively for last decades in many research areas as conductive polymer [1]. In this study, PEDOT was used to modify natural chitosan biopolymer using RF EDOT plasma produced at low pressure (0.02 Torr) with 13.56 MHz frequency at a power of 50W for 24h.

PTFE and C 3 F 6 deposition on the AISI 1050 stainless steel for lubrication by RF plasma

Summary form only given. In this study, on surface of heat treated AISI 1050 stainless steel was coated in RF vacuum plasma system with different plasma parameters (treatment time, type of gas, power, pressure, electrode distance). First stainless steel surfaces were coated by plasma grafting of sprayed polytetrafluoroethylene (PTFE) using by Argon and Helyum plasma. In the other process, thin layer was deposited by hexafluoropropene (C 3 F 6 ) plasma on the stainless steel surface. After the deposition, surface morphology was analysed by Scaning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDS), Atomic force microscope (AFM). Abrasion of samples was tested. As a result of abrasion test the C 3 F 6 plasma processes more effective than PTFE coating. Optical emission spectrum (OES) and current-voltage measurements were used for plasma characterization.

2.45 GHz atmospheric pressure waveguide based plasma designs

Summary form only given. Atmospheric pressure microwave (2.45 GHz) plasma torch using WR- 284 type waveguide has been designed and the efficiency and uniformity of the plasma have been increased with a different kind of torch design. The traditional and modified torch plasma characteristics are compered.