Thin Film Deposition on Open-Cell Foams by Atmospheric Pressure Dielectric Barrier Discharges

2015 ◽  
Vol 13 (4) ◽  
pp. 470-479 ◽  
Author(s):  
Fiorenza Fanelli ◽  
Francesco Fracassi
Keyword(s):  
Thin Film ◽  
Atmospheric Pressure ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Dielectric Barrier Discharges ◽  
Dielectric Barrier ◽  
Open Cell ◽  
Open Cell Foams ◽  
Barrier Discharges

scholarly journals Direct Exposure of Dry Enzymes to Atmospheric Pressure Non-Equilibrium Plasmas: The Case of Tyrosinase

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2181
Author(s):  
Annamaria Lapenna ◽  
Fiorenza Fanelli ◽  
Francesco Fracassi ◽  
Vincenza Armenise ◽  
Valeria Angarano ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Atmospheric Pressure ◽  
Direct Interaction ◽  
Thin Film Deposition ◽  
Ring Structure ◽  
Film Deposition ◽  
Dielectric Barrier Discharges ◽  
Direct Exposure ◽  
Barrier Discharges ◽  
Non Equilibrium

The direct interaction of atmospheric pressure non-equilibrium plasmas with tyrosinase (Tyr) was investigated under typical conditions used in surface processing. Specifically, Tyr dry deposits were exposed to dielectric barrier discharges (DBDs) fed with helium, helium/oxygen, and helium/ethylene mixtures, and effects on enzyme functionality were evaluated. First of all, results show that DBDs have a measurable impact on Tyr only when experiments were carried out using very low enzyme amounts. An appreciable decrease in Tyr activity was observed upon exposure to oxygen-containing DBD. Nevertheless, the combined use of X-ray photoelectron spectroscopy and white-light vertical scanning interferometry revealed that, in this reactive environment, Tyr deposits displayed remarkable etching resistance, reasonably conferred by plasma-induced changes in their surface chemical composition as well as by their coffee-ring structure. Ethylene-containing DBDs were used to coat tyrosinase with a hydrocarbon polymer film, in order to obtain its immobilization. In particular, it was found that Tyr activity can be fully retained by properly adjusting thin film deposition conditions. All these findings enlighten a high stability of dry enzymes in various plasma environments and open new opportunities for the use of atmospheric pressure non-equilibrium plasmas in enzyme immobilization strategies.

Analysis of parameters of coaxial dielectric barrier discharges in argon flow at atmospheric pressure

2021 ◽  
Vol 129 (15) ◽  
pp. 153305
Author(s):  
Hui Li ◽  
Chengxun Yuan ◽  
Anatoly Kudryavtsev ◽  
Aleksandr Astafiev ◽  
Evgeny Bogdanov ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Dielectric Barrier Discharges ◽  
Dielectric Barrier ◽  
Argon Flow ◽  
Barrier Discharges
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