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Home  > Raw materials & technologies  > Science today - coatings tomorrow  > Developing highly transparent bio-coatings

Wednesday, 01 April 2020
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Raw materials & technologies, Science today - coatings tomorrow

Developing highly transparent bio-coatings

Wednesday, 8 May 2013

Taiwanese scientists developed highly transparent biocompatible coatings with both dense and porous structures. The coatings were synthesized by low temperature sol-gel process.

Highly transparent silica-titania films with dense and mesoporous structures were prepared by the sol-gel process / Source: Fotolia

Highly transparent silica-titania films with dense and mesoporous structures were prepared by the sol-gel process / Source: Fotolia

Highly transparent silica-titania films with dense and mesoporous structures were prepared by the sol-gel process. The films were prepared by a single spin coating process using mixed silica-titania sols, followed by annealing at 180 °C. The transmittances of both films were higher than 97 % in the UV-visible IR range. The refractive index of the dense film measured by ellipsometry was 1.87-1.59 in the range of 300-1100 nm (1.63 at 500 nm).

The pencil hardness test showed that the hardness of the dense and porous films were over 9H and 3B, respectively. The cytotoxicity test (MTT assay) showed that both films had no poisonous effect on the living cells. From the surface composition analysis by X-ray photoelectron spectroscopy, SiO2 was found to exist on the film surface which could be responsible to the good biocompatibility of the film.

Read the complete study "Highly transparent hard bio-coating synthesized by low temperature sol-gel process” by Hsueh-Shih Chen, Sheng-Hsin Huang and Tsong-Pyng Perng in Surface and Coatings Technology, April 2013.

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