• D J Li

Articles written in Bulletin of Materials Science

• Cell attachment on diamond-like carbon coating

Preliminary results of diamond-like carbon (DLC) coating with its novel properties with no toxicity have caused a strong interest of commercial manufacturers of surgical implants. DLC coatings were prepared on polymethylmethacrylate (PMMA) at room temperature using ion beam assisted deposition (IBAD). It could be shown by X-ray photoelectron spectroscopy, Auger electron spectroscopy, and Raman spectroscopy that DLC coating prepared by 800 eV CH𝑛+ beam bombardment possessed a higher fraction of 𝑠𝑝3 bonds in the structure of mixed 𝑠𝑝3 + 𝑠𝑝2 bonding, resulting in a higher hydrophobicity. The results of the cell attachment tests indicated that DLC coatings exhibited low macrophage attachment and provided desirable surface for the normal cellular growth and morphology of the fibroblasts. At the same time, the number of both neutral granulocytes and platelets adhering to DLC coatings decreased significantly. These findings showed that DLC was a better coating with desirable tissue and blood compatibility.

• Influence of N atomic percentages on cell attachment for CN$_x$ coatings

Carbon film is an excellent candidate for use as a biocompatible coating due to its excellent properties. However, considerable attention has just been focused on the biocompatibility of diamond-like carbon (DLC) in recent years. It is difficult to find reports on the investigations of the biocompatibility of CN$_x$ so far. It is well known that CN$_x$ has similar structural characteristics as that of DLC. Its excellent mechanical and tribological properties are comparable to that of DLC. In addition, it is probable that the presence of nitrogen leads to a positive effect on biocompatibility. So, this work focusses on cell attachment of CN$_x$ coating and the relation between nitrogen atomic percentage and cell attachment.

CN$_x$ coatings were prepared using magnetron sputtering under two N2 partial pressures for the evaluation of relation between nitrogen atomic percentage and cell attachment. Cell culture tests using human endothelial cells and mouse fibroblasts were performed. Both coatings resulted in no adverse effects on the cells in culture. Compared with CN$_x$ (𝑥 = 0.088), CN$_x$ (𝑥 = 0.149) film provided a better surface for normal cellular attachment, spreading and proliferation without apparent impairment of cell physiology. At the same time, the coatings exhibited excellent tribological and corrosion performance. XPS and AES analyses showed that higher nitrogen atomic percentage might lead to a positive effect on the cell attachment.

• # Bulletin of Materials Science

Volume 43, 2020
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