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Effects of Chemical Composition of Titanium Material Surface on SAMs Formation by Functional Groups of Alkanethiol and Alkanesilanes

Cheol Sang Kim 1,4,  Kyung Shin 2,  Bock Choon Pak 3

1. Chonbuk National University, Devision of Electronics and Information Engineering, 31,Baekje-Ro, Duckjin-Gu, Jeonju 561-756, Korea, South
2. Chonbuk National University, Department of Biomedical Engineering, Graduate School, 664-14, Duckgin-dong, Duckgin-gu, Jeonju 561-756, Korea, South
3. Chonbuk National University, Division of Mechanical & Aerospace System Engineering, 664-14, Duckgin-dong, Duckgin-gu, Jeonju 561-756, Korea, South
4. Chonbuk National University, Department of Biomedical Engineering, Graduate School, 664-14, Duckgin-dong, Duckgin-gu, Jeonju 561-756, Korea, South

Abstract

Self-assembled monolayers(SAMs) have become an essential technique for biochemical modification using specific peptides on a biomaterial surface. Previous studies have reported effects of their terminal functionalities including the organic molecules on apatite formation in a simulated body fluid. Also biological responses are influenced by the surface chemical characteristics of SAMs. In this study, the adsorption behavior of the alkanethiol and two alkanesilanes on the modified titanium surfaces were examined using an electrochemical quartz crystal nanobalance(EQCN). Furthermore, the formation of SAMs on three working electrode surfaces: Au coated Ti, commercialized pure Ti(c.pTi) and TiO2 were examined. Resolution limit obtained for the constructed EQCN was about 0.1 ng. The mass change ratio on the surfaces versus immersion time was precisely investigated using the EQCN. The quantity of Thiol-I SAM adsorbed on c.p Ti is about 67% compared with the quantity formed on Au coated titanium substrate. However, there was no SAM formation on the TiO2 surface with thick titanium oxide layer obtained by electrochemical oxidation method. The SAMs amount (for organosilanes) adsorbed on TiO2 surfaces of Silane-I[(CH3O)3Si(SH2)3NHCH2CH2NH2 )] and Silane-II[H2N(CHS)3Si(OCH3)3] were approximately 19% and 14% more than that for c.pTi. Results obtained from this study show that by altering titanium surface chemistry and introducing functional groups, titanium surface may be modified into a functional bioactive surface and can be used in the same way as Au substrate.

 

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium E, by Cheol Sang Kim
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-26 15:18
Revised:   2009-06-08 12:55