Plasma Processes and Polymers

Cover image for Vol. 12 Issue 4

Online ISSN: 1612-8869

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Recently Published Articles

  1. Assessment of Atmospheric-Pressure Guided Streamer (Plasma Bullet) Influence on Liposomes with Different Composition and Physicochemical Properties

    Panagiotis Svarnas, Sophia H. Matrali, Kristaq Gazeli and Sophia G. Antimisiaris

    Article first published online: 27 APR 2015 | DOI: 10.1002/ppap.201400218

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    Even if the effects of atmospheric-pressure, cold plasmas on cells have been studied extensively during the last years, laborious cell-culture experiments still are needed for the fundamental understanding of the mechanisms involved. Hereby, liposomes of tunable lamellarity and charge, are introduced as easily handling models to quantify immediate or post-treatment membrane effects due to non-equilibrium plasmas in the form of plasma bullets.

  2. Three-Dimensional Fluid Model for Atmospheric Pressure Dielectric Barrier Discharge Plasma

    Muhammad M. Iqbal and Miles M. Turner

    Article first published online: 14 APR 2015 | DOI: 10.1002/ppap.201400231

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    We developed a three-dimensional fluid model to investigate the behavior of filamentation. Filamentation is a major source of instability and it develops frequently under distinct conditions. The dynamics of the filaments are explored by the influence of overvoltage and frequency. The filamentary profile of plasma is suppressed, when the frequency varies from 2.5–25 kHz. The trapping mechanism of electrons is identified only at higher frequencies (>50 kHz).

  3. Non-Equilibrium Dielectric Barrier Discharge Treatment of Mesenchymal Stem Cells: Charges and Reactive Oxygen Species Play the Major Role in Cell Death

    Abraham Lin, Natalie Chernets, Justine Han, Yordano Alicea, Danil Dobrynin, Gregory Fridman, Theresa A. Freeman, Alexander Fridman and Vandana Miller

    Article first published online: 14 APR 2015 | DOI: 10.1002/ppap.201400232

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    We determined the components of non-thermal, atmospheric plasma that contribute to murine mesenchymal stem cell death. When plasma is generated for biological treatments, four major components are produced: electric fields, radiation, charged particles, and neutral gas species. We isolated and removed each from nanosecond pulsed dielectric barrier discharge (nspDBD) plasma treatment and evaluated cell viability. We determined that plasma generated charges and reactive oxygen species play the major role in cell death in this system.

  4. Chemical and Physical Effects of the Carrier Gas on the Atmospheric Pressure PECVD of Fluorinated Precursors

    Julie Hubert, Nicolas Vandencasteele, Jérémy Mertens, Pascal Viville, Thierry Dufour, Cédric Barroo, Thierry Visart de Bocarmé, Roberto Lazzaroni and François Reniers

    Article first published online: 7 APR 2015 | DOI: 10.1002/ppap.201500025

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    The effect of the carrier gas on the chemical and physical properties of fluorinated coatings synthesized from PECVD of liquid precursors (C6F12 and C6F14) is investigated. Significant differences in the fragmentation of the precursor, the deposition rates, and the chemistry, morphology, and wettability of the coatings are observed between the filamentary argon and homogeneous helium discharges.

  5. On the Hydrophilicity and Water Resistance Effect of Styrene-Acrylonitrile Copolymer Treated by CF4 and O2 Plasmas

    Jorge López-García, Gregor Primc, Ita Junkar, Marian Lehocký and Miran Mozetič

    Article first published online: 7 APR 2015 | DOI: 10.1002/ppap.201400216

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    SAN copolymers are in ever growing demand for various technological applications. This study explores O2 and CF4 plasma treatments as strategies to enhance surface properties of this polymeric material. The results presented herein highlight the potential of plasmas to extend SAN applicability,and opens the door to more in depth studies from both scientific and engineering standpoint.

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