Photocatalytic self-cleaning keratins: A feasibility study

Anatase nanocrystals were successfully synthesized and deposited on protein keratin-type wool fibers with good compatibility and significant photocatalytic self-cleaning activity using the sol–gel process. Due to the low chemical resistance and liability to photo-degradation of protein materials, th...

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Bibliographic Details
Published in:Acta biomaterialia 2009, Vol.5 (1), p.50-56
Main Authors: Tung, Wing Sze, Daoud, Walid A.
Format: Article
Language:English
Subjects:
Acid catalysis
Biocompatible Materials - chemistry
Catalysis
Feasibility Studies
Hydrochloric Acid - chemistry
Hydrolysis
Keratins - chemistry
Nanocoating
Nanostructures - chemistry
Nanotechnology - methods
Oxygen - chemistry
Phase Transition
Photocatalysis
Photochemistry - methods
Self-cleaning
Stress, Mechanical
Titanium - chemistry
Titanium dioxide
Ultraviolet Rays
X-Ray Diffraction
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Summary:Anatase nanocrystals were successfully synthesized and deposited on protein keratin-type wool fibers with good compatibility and significant photocatalytic self-cleaning activity using the sol–gel process. Due to the low chemical resistance and liability to photo-degradation of protein materials, the effect of the acid catalyst used in the sol synthesis was studied. The sols were prepared using oxidizing and non-oxidizing catalysts, nitric acid and hydrochloric acid, respectively, for the hydrolysis and condensation reactions of the titanium dioxide precursor. The size distribution and crystallinity of the sols were characterized by X-ray diffraction spectroscopy and photon correlation spectroscopy. The compatibility of sol formulations and wool is thoroughly compared and discussed by analyzing fibers photo-degradation, surface morphology and self-cleaning properties including stain degradation and colorant decomposition. The UV absorption and mechanical properties of wool fibers before and after coating are also discussed.
ISSN:1742-7061
1878-7568
DOI:10.1016/j.actbio.2008.08.009