Acrylic Acid Polymer Coatings on Silk Fibers by Room‐temperature APGD Plasma Jets

Abstract

The aim of this work is to coat silk fibers (SF) with polymer of acrylic acid (PAA) using an atmospheric pressure glow discharge (APGD) plasma jet in order to immobilize antimicrobial peptide LL‐37. The polymer properties are characterized by contact angle goniometry (CAG), XPS, AFM and SEM. The CA of the SF film can be decreased to 34°, and the surface roughness of PAA in the center of plasma jet is larger than in other areas. Compared with the original SF, the concentration of carboxyl group increases greatly when the SF are modified by Ar plasma jet polymerization of AA. The augmentation of functional groups is very useful to immobilize larger concentrations of microbial peptide LL‐37 on the SF surface, and the satisfactory antimicrobial activity on inhibiting the Escherichia coli (E. coli) is thereby achieved.magnified image

Improvement of the Water Stability of Plasma Polymerized Acrylic Acid/MBA Coatings Deposited by Atmospheric Pressure Air Plasma Jet

“…Dielectric barrier discharges have been used successfully, introducing acrylic acid in argon or helium plasmas [9][10][11][12]. Plasma jet with dielectric barriers has also been used with different gases such as helium [13], argon [14], Ar/O 2 and He/O 2 mixtures [15]. The possibility to use an atmospheric pressure plasma jet (APPJ) with a blown pulsed-arc has also been shown recently in our previous work: liquid acrylic acid was introduced directly in a nitrogen plasma to deposit the films [16].…”

Deposition of Plasma‐Polymerized Polyacrylic Acid Coatings by a Non‐Equilibrium Atmospheric Pressure Nanopulsed Plasma Jet

“…Plasma‐polymerization of acrylic acid (AA) has raised great interest for the production of adhesion‐promoting interlayers, e.g., in carbon fiber/epoxy composites, as well as for the development of biocompatible polymers and for the immobilization of antimicrobial peptides on substrates . In the frame of biomedical applications, plasma‐polymerization of AA has been widely investigated to produce coatings containing carboxylic acid (COOH) groups, which are known to favor cell adhesion and can be also be exploited for biomolecule immobilization …”

“…With regard to AA plasma‐polymerization, Donegan and Dowling investigated the water stability, the chemical/morphological characteristics, and the level of protein adhesion of pPAA coatings deposited onto silicon substrates by using two different plasma jet deposition systems. Chen et al highlighted the possibility to deposit pPAA coatings onto the surfaces of silk fibers (SF) using an atmospheric pressure glow discharge in order to immobilize antimicrobial peptide onto the SF surface. Carton et al employed a pulsed‐arc atmospheric pressure plasma jet for the AA plasma polymerization and the deposition of organic coatings suitable for biomedical applications.…”

Co‐Deposition of Plasma‐Polymerized Polyacrylic Acid and Silver Nanoparticles for the Production of Nanocomposite Coatings Using a Non‐Equilibrium Atmospheric Pressure Plasma Jet

“…[31,32,50,51] Indeed, Vogelsang et al, [31] in their work on the deposition of C:F coatings using a RF capillary microplasma jet, reported of a maximum coating thickness of 7.8 mm after 3 min of deposition; Chen et al, [32] reporting on the deposition of pPAA coatings with an atmospheric pressure glow discharge plasma jet, observed a thickness of around 300 nm after a 10 min deposition time. Bashir et al, [50] in their work on the polymerization of hexamethyldisiloxane using a DBD plasma jet, reported about an average thickness of the deposited coating of 662 AE 33 nm after a treatment time of 3 min.…”