Journal
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
Volume 87A, Issue 4, Pages 1027-1033Publisher
WILEY
DOI: 10.1002/jbm.a.31838
Keywords
lanthanum oxide; dual plasma deposition; blood compatibility; antibacterial properties
Funding
- Hong Kong Research Grants Council [CityU 112306]
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Lanthanum oxide (La2O3) films with good hemocompatibility and antibacterial properties have been fabricated using dual plasma deposition. X-ray photoelectron spectroscopy (XPS) shows that La exists in the +3 oxidation state. The band gap of the materials is determined to be 3.6 eV. Activated partial thromboplastin time (APTT) and blood platelet adhesion tests were used to evaluate the blood compatibility. The bacteria, Staphylococcus aureus, were used in plate counting tests to determine the Surface antibacterial properties. The APTT is a little longer than those of blood plasma and stainless steel (SS). Furthermore, the numbers of adhered, aggregated, and morphologically changed platelets are reduced compared with those on low-temperature isotropic carbon and SS. The antibacterial plate-counting test indicates that La2O3 has good antibacterial activity against S. aureus. These unique hemocompatibility and antibacterial properties make La2O3 Useful in many biomedical applications. (C) 2008 Wiley Periodicals, Inc. J Biomed Mater Res 87A: 1027-1033, 2008
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