DC Discharge Plasma Modification of Chitosan Films: An Effect of Chitosan Chemical Structure

Abstract

Surface plasma treatment of chitosan films is a widely used technique to control a variety of their properties, such as permeability, hemostatic activity and ability to support cell adhesion, proliferation and growth. Among other factors to be controlled, the chemical structure of initial chitosan is rarely taken into consideration. This work is aimed to highlight this factor by the example of low pressure direct-current discharge of various chitosan film samples. Contact angle measurements, X-ray photoelectron spectroscopy and scanning electron microscopy revealed differences in the film surface properties of the initial and plasma-treated films. The effect of the plasma treatment on cell viability of L929 mouse fibroblasts was studied by MTT-assay.

Plasma Treatment of Poly(ethylene terephthalate) Films and Chitosan Deposition: DC- vs. AC-Discharge

“…The chamber (140 × 200 × 110 mm; electrode area of~200 cm 2 ) was evacuated to a base pressure of 20 mTorr before the working gas, synthetic air, was introduced at a flow rate of 20 sccm. Subsequently, the glow discharge was ignited at 50 W within 10-60 s. DC-discharge (50 mA) plasma treatment was carried out using a laboratory-made setup consisting of two electrodes of 18 cm in diameter (electrode area of 254 cm 2 ) with a gap of 5 cm [25]. Plasma treatment was realized at the anode or at the cathode using filtered air as working gas (~20 Pa) within 10-60 s, as previously described [26].…”

Overview of sterilization methods for UHMWPE through surface analysis

“…Another impacting factor would be the surface texture, especially on the micro-scale, where cell adhesion phenomena occurs -and also AFM results indicate a much rougher surface for CPO samples, leading to a hindering of L929 cell spreading. 64 Overall, biocompatibility aspects were not compromised in the different treatments, once cells adapted to all conditions in a different way.…”

The gas permeability properties of poly(vinyltrimethylsilane) treated by low‐temperature plasma

“…One‐sided modification of PVTMS films was carried out in a D C discharge; the setup and technique are described in detail in Reference 5. Samples 7 × 7 cm 2 in size were placed on the anode, filtered atmospheric air was used as a working gas, the pressure in the system was 10–25 Pa, the discharge current was 50 mA, and the processing time was varied from 10 to 60 s.…”

“…The intensive development of membrane science and technology and the expansion of the areas of application of membranes, along with the synthesis of new polymers, has led to the further development of various methods of physicochemical modification of polymers and commercially available gas‐separation membranes. One of the most significant directions in the improvement of membrane parameters is the use of surface modification, particularly chemical modification methods, including halogenation and electrochemical, irradiation and plasma treatments 1–11 . At the same time, at present, the most environmentally friendly approaches are based on solution‐free technologies, for example, the treatment of the membrane surface using a low‐temperature plasma method, which is increasingly used to modify various polymers and polymer membranes 12,13 .…”

“…One of the most significant directions in the improvement of membrane parameters is the use of surface modification, particularly chemical modification methods, including halogenation and electrochemical, irradiation and plasma treatments. [1][2][3][4][5][6][7][8][9][10][11] At the same time, at present, the most environmentally friendly approaches are based on solution-free technologies, for example, the treatment of the membrane surface using a low-temperature plasma method, which is increasingly used to modify various polymers and polymer membranes. 12,13 Either inert gases, for example, Ar, or reagent gases such as N 2 , O 2 , NH 3 , CF 4 , and CO 2 , are used for low-temperature plasma modification, 12,[14][15][16][17][18][19][20] and it has been shown that the choice of gas significantly affects the results of the surface treatment.…”