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Visible light-induced antibacterial effects of the luminescent complex of hydroxyapatite and 8-hydroxyquinoline with gray titania coating
- Source :
- Applied Surface Science. 448:529-538
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The aim of this study is to observe visible light-induced antibacterial effects of the luminescent complex of hydroxyapatite and 8-hydroxyquinoline with gray titania coating. Plasma-sprayed Hydroxyapatite (HAp) coating has been widely used as bonding between alveolar bones with dental implants. However, bacterial infection on the surfaces of dental implants has recently been reported and conventional antibacterial technologies cannot last long-term use. Therefore a novel technology using the complex of hydroxyapatite and 8-hydroxyquinoline (8-Hq) with gray titania was proposed, which can be activated by visible light. Ti2O3 powder was used in a plasma-spraying process to fabricate visible-light-sensitive titania coating. The plasma-sprayed HAp/Ti2O3 was characterized by Raman Spectroscopy, FTIR and XRD. Its photo catalytic activity was evaluated using chemiluminescence observation and antibacterial property was evaluated by optical density measurement (OD), colony forming unit (CFUs) and fluorescent microscope observation. The plasma-sprayed Ti2O3 powder revealed that its phase changed to TiO2(Rutile) though the color of the plasma-sprayed Ti2O3 powder kept dark gray, which possessed its absorbency in visible-light region. The plasma-sprayed Ti2O3 powder was then called gray titania and 1 O 2 was generated from the gray titania by irradiating three types of laser (blue, green and red). Antibacterial evaluation revealed that both the existence of the complex and the irradiation of LEDs could significantly decrease the numbers of colony forming unit (CFUs). Furthermore, HAp-8Hq complex decreased adhesion of E. coli even without light irradiation. An enhancement in the antibacterial property of HAp complexes with gray titania coating can be attributed to an increased power density of light on the surface of gray titania by fluorescence.
- Subjects :
- Materials science
General Physics and Astronomy
02 engineering and technology
Surfaces and Interfaces
General Chemistry
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Fluorescence
0104 chemical sciences
Surfaces, Coatings and Films
symbols.namesake
Coating
Rutile
symbols
engineering
Irradiation
Fourier transform infrared spectroscopy
0210 nano-technology
Raman spectroscopy
Luminescence
Visible spectrum
Nuclear chemistry
Subjects
Details
- ISSN :
- 01694332
- Volume :
- 448
- Database :
- OpenAIRE
- Journal :
- Applied Surface Science
- Accession number :
- edsair.doi...........49cd55ca34146ab92052f2395c639e76