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Plasma Medicine
SJR: 0.278 SNIP: 0.183 CiteScore™: 0.57

ISSN 印刷: 1947-5764
ISSN オンライン: 1947-5772

Plasma Medicine

DOI: 10.1615/PlasmaMed.2016015722
pages 223-236

Optical Emission Spectroscopy and Contact Angle Study of Plasma Cleaning of Titanium Alloy Surfaces: Argon Plasma

Jordan Katz
Orthobond Inc., North Brunswick, NJ 08902
Sophia Gershman
A. Belkind & Associates, LLC, North Plainfield, NJ 07060
Abraham Belkind
Orthobond Inc., North Brunswick, NJ 08902; A. Belkind & Associates, LLC, North Plainfield, NJ 07060

要約

Plasma cleaning is common in the preparation of titanium medical devices. In this study, we examine the use of continuous in situ measurements with optical emission spectroscopy (OES) during plasma cleaning and wet contact angle as a tool to assess titanium implant cleanliness. Plasma cleaning was performed in argon plasma at 66.7 Pa in a commercially available radio-frequency (RF) power plasma system using 25 or 100 W of power. During cleaning, the intensities of OES lines at 386 and 418 nm, as related to surface contaminants, decreased over time and reached a baseline level in ~1 h. However, the water contact angle (WCA) decreased more rapidly, reaching ≤10 degrees in 3-5 sec and further decreased to the limit of detection of ~1 ± 1 degree in 20 min using 25 W plasma and in 1 min using 100 W plasma. The OES data indicate that plasma cleaning starts with rapid removal of contaminants from pronounced regions that are better exposed to the plasma and is followed by prolonged cleaning related to the removal of contaminants from less accessible regions. The delayed rise in WCA demonstrates a limitation in using that technique to assess cleanliness and shows how OES is a useful tool to better understand and control plasma cleaning of titanium surfaces.