Papers by Keyword: X-Ray Photoelectron Spectroscopy (XPS)

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Authors: Guo Chao Qi, Feng Jun Shan, Qiang Li, Jing Yuan Yu, Qu Kai Zhang
Abstract: Magnesium apatite (MA, (Ca9Mg)(PO4)6(OH)2) and Hydroxyapatite (HA) coatings were synthesized on Ti6Al4V substrates by a sol-gel dip coating method. Glucose and bovine serum albumin (BSA) were added to the standard simulated body fluid (SBF) separately to form organic-containing simulated body fluids. MA and HA coatings were immersed in standard and organic modified SBF for time periods of 4, 7, 14, 21 and 28 days at 37±1°C. The surface dissolution and deposition behavior of the coatings after soaking were examined with Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS). The results show that glucose in SBF has no apparent effect on the deposition of new apatite from the solution. BSA in SBF shows retardation effect on the deposition of apatite by forming a protein dominant globular layer. This layer inhibits the further deposition of apatite from SBF solution.
Authors: Igor Matko, Bernard Chenevier, M. Audier, Roland Madar, M. Diani, L. Simon, L. Kubler, D. Aubel
Authors: Robert S. Okojie, Ming Xhang, P. Pirouz, Sergey P. Tumakha, Gregg Jessen, Leonard J. Brillson
Authors: Frédéric Lanois, Dominique Planson, P. Lassagne, Christophe Raynaud, Edwige Bano
Authors: Chong Mu Lee, Kyung Ha Kim
Abstract: Diamond-like carbon (DLC) films have been deposited by radio frequency plasma enhanced chemical vapour deposition (rf-PECVD) with different Ar-CH4 mixtures. Nanocrystalline diamond films have been deposited by microwave plasma-enhanced chemical vapour deposition (MPCVD), using Ar-H2-CH4 mixtures. X-ray photoelectron spectroscopy (XPS) and nanotribological investigation (by scanning force microscopy) have been used to compare the mechanical properties and structures of these films. Highly orientated and non-orientated microcrystalline diamond films and MPCVD-produced amorphous carbon have also been studied by way of comparison. The diamond films exhibit a linear relationship between roughness and the coefficient of friction. The DLC and amorphous carbon have higher friction coefficients than the best performing diamond film, but may more easily be deposited as smooth coating. Possible applications for these various carbon-based films include microelectromechanical components, for which smooth, hard coatings are required.
Authors: Y. Fujiwara, Tetsuhiko Isobe, Mamoru Senna, M. Tanaka
Authors: C.G.H. Walker, S.A. Morton, J.M. Charnock, E.J. MacLean, Norman M.D. Brown
Authors: Wei Jie Lu, D.T. Shi, T.R. Crenshaw, A. Burger, W.E. Collins
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