Deakin University

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Photoprotective properties of alpaca fiber melanin reinforced by rutile TiO 2 nanoparticles: A study on wool fabric

journal contribution
posted on 2019-02-01, 00:00 authored by Yujia Liang, Esfandiar Pakdel, Mingwen Zhang, Lu Sun, Xungai Wang
© 2018 Melanin/titanium dioxide (TiO 2 ) composite systems are introduced as efficient UV absorbers. Natural melanin particles were extracted from the pigmented alpaca fibers and the spindle-like rutile TiO 2 nanoparticles were synthesized through a two-step sol-gel method at room temperature. The composites of melanin/TiO 2 were prepared via electrostatic attraction force. In order to understand the UV absorption features of melanin and melanin/TiO 2 composite systems, the prepared particles were applied to the surface of wool fabrics. Then, the UV protection and photostability of functionalized fabrics were assessed based on photoinduced chemiluminescence (PICL) emission, UV reflectance spectra, photoyellowing and ultraviolet protection factor (UPF). It was observed that the photostability of treated fabrics enhanced significantly, implying the generation of less free polymeric radicals in the substrate under UV irradiation. Among different synthesized composites, the proportion of melanin/TiO 2 1/4 was the most efficient ratio inducing 80% reduction in the PICL emission peak intensity compared with untreated wool samples. The presence of melanin particles significantly enhanced the UPF values of fabrics where 30% increment was observed for wool samples after treating with melanin/TiO 2 1/4 compared with pure TiO 2 . Having some advantages such as nontoxicity, eco-friendly and feasible synthesis approach, the prepared bio-organic/inorganic composite structures can be of some potential applications in photoprotecting and free radical quenching purposes.



Polymer degradation and stability




80 - 88




Amsterdam, The Netherlands





Publication classification

C1 Refereed article in a scholarly journal