| Summary: | 碩士 === 國立中正大學 === 機械工程所 === 96 === Self-assembled monolayers(SAMs) have proven to be an efficient biomimetic strategy in the development of material with controllable surface properties. Self-assembled monolayers is a process in which molecules spontaneouslyorganize into ordered assemblies by noncovalent intermolecular force. In past years, self-assembled monolayers have been developed widely in many application field, such as optical instruments, electronics, biomedical application. Adsorption and adhesion of SAMs is of interest for use in dental application in past year. According to atomic force microscopy imaging, the SAM growing process as the formation of islands on the surface. Therefore, the wear and surface roughness(aesthetic) properties have to the considered in the future application.
The purpose of this study was to investigate the possibility of achieving better mechanical properties in the artificial tooth with self-assembled monolayers. Self-assembled monolayers (ODPA,ODT,OTS,ODS) must possess biocompatible. The influence of artificial denture and SAMs on adhesion, surface energy, water hydrophobic, friction and anti-attrition by AFM, nano test, contact angle, ESCA and FTIR analyzer. Moreover, the optimal SAMs were choiced to apply to coating surface of industrial optimal product.
In this study, it is found that ODPA, ODS, OTS and ODT of SAMs exhibit lower surface energy than artificial teeth surface. All of them can reduce adhesive force and friction force. In contact angle, the contact angles on the SAMs surface are larger than that on the artificial teeth. The contact angles of SAMs for OTS at six hours larger than the other surface film cases. The maximum contact angle is about 123°. For adhesive force test by AFM, the OTS film at six hours exhibit the smallest value. However, the reaction time is the important issue during fabrication process, two hours fabrication time of OTS film is the better choice. In order to chew food, teeth surface need a certain value of friction coefficient. In pin on disc friction model of indentation tester, ODS and ODT films have the better friction properties for all SAMs films. In ESCA, It may discover the O1s element has the certain influence to the SAMs, the contact angle is increased with decrease of counts/sec. In FTIR, it is found that contact angle is increased with increase of peak, show the molecular arranges neatly. In this study, it is found SAMs for OTS at six hours has best contact angle, smallest adhesion force and reduces the particle adsorption situation. These results suggest that SAMs have proven to be an efficient in the artificial teeth surface.
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