NDLI: On the Interaction of Cold Atmospheric Pressure Plasma with Surfaces of Bio-molecules and Model Polymers

Content Provider	Springer Nature Link
Author	Bartis, E. A. J. Kll, A. J. Luan, P. Seog, J. Oehrlein, G. S.
Copyright Year	2015
Abstract	We review studies of surface-interaction mechanisms for a surface microdischarge (SMD) and an atmospheric pressure plasma jet (APPJ) with model polymers and biomolecules in our laboratory. We discuss the influence of plasma source type, operating parameters, and gaseous environments on surface modifications and biological deactivation. We focus on mild, remote conditions where the visible plasma plume does not contact the surface. For an APPJ fed with Ar, the interaction of the plasma plume with O$_{2}$ and/or N$_{2}$ gaseous environments leads to oxidation and surface-bound NO$_{x}$ even on materials containing neither oxygen nor nitrogen. The APPJ also modifies photo-sensitive polymers. Using optical filters, these modifications were shown to result in part from irradiation with vacuum ultraviolet (VUV) photons in a spectral range corresponding to Ar excimer emission. No VUV-induced effects were seen for the SMD source operated with O$_{2}$/N$_{2}$. SMD treatments using O$_{2}$/N$_{2}$ mixtures result in surface oxidation and nitridation. A new surface-bound species, NO$_{3}$, has been measured on the polymers and biomolecules. Depending on the gas chemistry and film molecular structure, the NO$_{3}$ surface concentration can reach 10 %. Both surface NO$_{3}$ on plasma-treated films of lipopolysaccharide (LPS), an immune stimulating biomolecule found in bacteria such as E. c oli, and overall surface oxidation correlate with LPS biological deactivation as evaluated using an enzyme-linked immunosorbent assay. Ambient humidity was studied using the SMD and was found to decrease overall surface modifications including NO$_{3}$ and biodeactivation for O$_{2}$-rich conditions. Lastly, we discuss possible mechanisms and compare our results with published simulation studies.
Starting Page	121
Ending Page	149
Page Count	29
File Format	PDF
ISSN	02724324
Journal	Plasma Chemistry and Plasma Processing
Volume Number	36
Issue Number	1
e-ISSN	15728986
Language	English
Publisher	Springer US
Publisher Date	2015-10-31
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atmospheric pressure plasma Polymer Biomolecules Surfaces Inorganic Chemistry Mechanics Characterization and Evaluation of Materials Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Surfaces, Coatings and Films Condensed Matter Physics Chemical Engineering

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