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- 저자 : Wiss, Kerstin T. (검색결과 4 건)
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Wi, S.S.,Han, M.K.,Kim, D.H.,Lee, H.,Lee, H.J.,Lim, J.,Jun, H.S.,Hwang, D.,Lee, Y. Elsevier 2015 Current Applied Physics Vol.15 No.11
RF glow discharges are widely used in deposition, etching and surface treatments for semiconductor materials. Especially, roll-to-roll processing is necessary for flexible display or thin film solar cell modules. For a roll-to-roll thin film deposition processing, it is necessary to use cylindrical grounded electrode. The effects of electrode shapes on the plasma properties of capacitively coupled rf argon discharge at 13.56 MHz are investigated using self-consistent two-dimensional fluid simulation. The simulation model includes blocking capacitor and external circuit effects. Comprehensive analysis has been made in terms of time-varying current-voltage characteristic, spatial distributions of plasma density and ion current density on the substrate. The effects of applied voltage (V<SUB>f</SUB>=200~800[V]) and gas pressure (p=0.5 ~ 2 Torr) on the plasma properties are also investigated. We found that flat electrode has a little bit higher impedance than that of cylindrical ground electrode. However the difference between the two configurations is less than 5% therefore we may conclude that the shape of grounded electrode does not significantly affect current-voltage characteristics of the discharge system. For roll-to-roll reactor version, displacement current come from dielectric layer between electrodes reaches more than 75% of total displacement current. Large displacement current results in degradation of power factor and matching circuit efficiency. For the cylindrical electrode, increasing electrode gap length along lateral direction makes that the location of peak electron density moves toward center of the reactor. The effect of the cylindrical electrode on the plasma spatial structure is reflected in the ion current density at substrate (dielectric layer) on grounded electrode. At low voltage and low power condition, about 90% of input power is consumed for electron heating. The efficiency decreases with increasing power and decreasing pressure as a consequence of increasing power to drive ion current. Electron heating efficiency decreased with pressure. The increase of pressure mainly reduces the diffusive component of the loss rate for both charged and neutral species.
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Wiss, Kerstin T.,Theato, Patrick Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of polymer science Part A, Polymer chemist Vol.48 No.21
<P>The synthesis of block copolymers via polymer conjugation of well-defined building blocks offers excellent control over the structures obtained, but often several coupling strategies need to be explored to find an efficient one depending on the building blocks. To facilitate the synthesis of polymers with adjustable functional end-groups for polymer conjugation, we report on the combination of activated ester chemistry with RAFT polymerization using a chain transfer agent (CTA) with a pentafluorophenyl ester (PFP-CTA), which allows for flexible functionalization of either the CTA prior to polymerization or the obtained polymer after polymerization. Different polymethacrylates, namely PMMA, P(t-BuMA) and PDEGMEMA, were synthesized with an alkyne-CTA obtained from the aminolysis of the PFP-CTA with propargylamine, and the successful incorporation of the alkyne moiety could be shown via <SUP>1</SUP>H and <SUP>13</SUP>C NMR spectroscopy and MALDI TOF MS. Further, the reactive α-end-groups of polymers synthesized using the unmodified PFP-CTA could be converted into azide and alkyne end-groups after polymerization, and the high functionalization efficiencies could be demonstrated via successful coupling of the resulting polymers via CuAAC. Thus, the PFP-CTA allows for high combinatory flexibility in polymer synthesis facilitating polymer conjugation as useful method for the synthesis of block copolymers. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010</P> <B>Graphic Abstract</B> <P>This article demonstrates how a chain transfer agent (CTA) with an activated ester group enables the synthesis of well-defined polymers with diverse functional α-end-groups via two easy but very efficient methods, one being the synthesis of functional CTAs and the other being the conversion of the activated ester end-group after polymerization. High functionalization efficiencies could be obtained in the conversion of the activated ester into alkyne and azide groups, and the resulting polymers could be conjugated to each other successfully via CuAAC. Thus, this CTA allows for high combinatory flexibility in polymer synthesis via RAFT polymerization facilitating polymer conjugation. <img src='wiley_img_2010/0887624X-2010-48-21-POLA24267-gra001.gif' alt='wiley_img_2010/0887624X-2010-48-21-POLA24267-gra001'> </P>
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Pressure equalization of rainscreen facades: Analysis of the field data in the frequency domain
Kumar, K. Suresh,Wisse, J.A. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.2
This paper reports the field measurements concerning pressure equalization of rainscreen facades carried out at the Technical University of Eindhoven (TUE) in the Netherlands. The field facility including the details of test panel, meteorological tower, instrumentation, data collection and analysis is presented. Results of investigations into cavity response for various leakage and venting configurations are discussed. Frequency domain techniques have been utilized to show the influence of wind as well as facade characteristics on the pressure equalization performance. Further, this paper presents an early attempt to synthesize the experimental results into existing building codes.
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