Bonding structure and haemocompatibility of silicon-incorporated amorphous carbon

Zhang, Sam; Du, Hejun; Ong, Soon-Eng; Aung, K. K.; Too, Hui-Chin; Miao, Xigeng

doi:10.1016/j.tsf.2005.12.037

Cited by 32 publications

(16 citation statements)

References 28 publications

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“…Okpalugo et al [11] have studied hydrogenated a-C films with silicondoping levels of less than 10 at%, and showed improved haemocompatibility with decreased platelet count for the doped films. Study on unhydrogenated a-C containing silicon showed that the quantity of adhering platelets was largely influenced by the surface energy of the film [12]. Besides changing deposition parameters or post-deposition treatment, the surface energy can be tuned by altering the concentration of the dopant.…”

Section: Introductionmentioning

confidence: 99%

Influence of silicon concentration on the haemocompatibility of amorphous carbon

Ong

Zhang

et al. 2007

Biomaterials

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Section: Introductionmentioning

confidence: 99%

Influence of silicon concentration on the haemocompatibility of amorphous carbon

Ong

Zhang

et al. 2007

Biomaterials

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“…[43] Similar or complementary effects were achieved through creating an artificial micro-or nano-scale surface topography by laser-patterning or plasma-etching or by subsequent thermal processing of carbon coatings. [44][45][46] From the biological perspective, the competitive adsorption of several plasma proteins (albumin, fibrinogen, globulins, complement factors and others) is the initial event in blood/biomaterial interaction. This complex process is very fast: a foreign surface introduced into blood will be covered with a monolayer of albumin within approximately 4× 10-4 sec.…”

mentioning

confidence: 99%

Surface Topography, Surface Energy and Wettability of Magnetron‐Sputtered Amorphous Carbon (a‐C) Films and Their Relevance for Platelet Adhesion

Stüber¹,

Niederberger²,

Danneil³

et al. 2007

Adv Eng Mater

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Diamond-like carbon (DLC) and amorphous carbon (a-C, a-C:H) coatings, respectively, have been proposed since many years as potential materials for biomedical applications due to their chemical inertness, low friction coefficient, high wear resistance, bio-and haemocompatibility. [1][2][3][4][5][6] The feasibility of amorphous carbon coatings was investigated for a variety of applications like surgical needles, [2] orthopaedic implants and prostheses, [7][8][9][10][11] medical guidewires, [12][13][14][15] coronary artery stents [16,17] and also for mechanical heart valve replacement and other solid implants. [18][19][20][21][22][23] The functionality, performance and durability of artificial surfaces in vivo are determined and often limited by their interaction with blood or tissue. However, the coagulation mechanism of blood on amorphous carbon (DLC) films in such a biomedical environment is not understood in detail even if the biocompatibility of DLC coatings was described early by many reports. [1,3,[24][25][26] Extensive information on individual aspects, like protein adsorption, platelet adhesion and activation on carbonaceous surfaces has been accumulated in the literature. [27][28][29] Since a few years more sophisticated approaches to the scientific understanding of the complex interaction of blood and inorganic surfaces are emerging by addressing this field through fundamental and interdisciplinary research efforts offering synoptical views based on materials science, chemistry, biology, physics, physical chemistry and medicine. [30][31][32] Main factors have been recognised to influence significantly the cell adhesion and interaction on amorphous carbon: these include the constitution of the carbon films and the fraction of the sp 3 bonds, [12,30] the surface energy and hydrophobicity, [27] and the surface roughness and topography. [26,31] The properties of a-C and DLC coatings, especially the biofunctional ones, can further be modified by incorporating other elements in the coatings, such as H, N, F, P, Si and metals. [4,5,[33][34][35][36][37][38][39] It is well known that the incorporation of additional elements into an amorphous carbon matrix has a very strong impact on the surface energy and wettability of such coatings. [40][41][42] Combining various surface modification methods should thus offer new tools for a future engineering design of biofunctional thin film materials, covering a wide range of properties, for example from strongly hydrophilic to extremely hydrophobic. Recently, it was shown that the modification of the inherent surface topography of carbon films on the nano-scale by proper adjusting of the deposition process and kinetics can strongly impact the wetting behaviour. [43] Similar or complementary effects were achieved through creating an artificial micro-or nano-scale surface topography by laser-patterning or plasma-etching or by subsequent thermal processing of carbon coatings. [44][45][46] From the biological perspective, the competitive adsorption of several plasma proteins (al...

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“…The effect of noble metal content on the Raman shifts of the G and D peaks should be taken into account. Since Pt and Ru have higher atomic masses than C, doping of Pt and Ru increases the integrated atomic mass of the entire network resulting in a decrease of vibration frequencies of Raman active phases [39]. Therefore, the increased Pt and Ru contents in the PtRuN-DLC films with increased negative substrate bias ( Fig.…”

Section: (C)mentioning

confidence: 99%

Tribological properties of platinum/ruthenium/nitrogen doped diamond-like carbon thin films deposited with different negative substrate biases

Khun

Liu

2014

Friction

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Abstract:The platinum/ruthenium/nitrogen doped diamond-like carbon (PtRuN-DLC) thin films were deposited on Si substrates via DC magnetron sputtering by varying negative substrate bias. The tribological performance of the PtRuN-DLC films was systematically investigated using ball-on-disc microtribological test. The Raman results showed that the increased negative substrate bias significantly increased the number of sp 3 bonds in the PtRuN-DLC films as a result of the increased kinetic energies of impinging ions. The adhesion strength of the PtRuN-DLC films apparently decreased with increased negative substrate bias due to the promoted residual stress in the films. The tribological results clearly revealed that the increased negative substrate bias decreased the friction and wear of the PtRuN-DLC films by improving the sp 3 bonded cross-linking structures of the films. It can be concluded that the PtRuN-DLC films could effectively prevent their underlying Si substrates from wear as the negative substrate bias had a significant influence on the tribological properties of the PtRuN-DLC films.

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Bonding structure and haemocompatibility of silicon-incorporated amorphous carbon

Cited by 32 publications

References 28 publications

Influence of silicon concentration on the haemocompatibility of amorphous carbon

Influence of silicon concentration on the haemocompatibility of amorphous carbon

Surface Topography, Surface Energy and Wettability of Magnetron‐Sputtered Amorphous Carbon (a‐C) Films and Their Relevance for Platelet Adhesion

Tribological properties of platinum/ruthenium/nitrogen doped diamond-like carbon thin films deposited with different negative substrate biases

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