Diffusion of coloured silica nanoparticles into human hair

Abstract

A novel method for dyeing human hair fibres using coloured silica nanoparticles of 206 nm has been developed. Diffusion of coloured silica nanoparticles into hair fibres has been investigated; silica nanoparticles do not penetrate at all, or do so only sparingly, into the structure of Caucasian virgin hair. However, coloured silica nanoparticles diffused readily into bleached hair fibres. Scanning electron microscopy showed that coloured silica nanoparticles were present mainly in the outer regions of the hair structure (the inner layers of the cuticle and the outer region of the cortex). It was found that the silica nanoparticles were physically entrapped in the hair fibres and results showed a good shampoo fastness to washing.

Natural pigments from six species of Thai plants extracted by water for hair dyeing product application

“…Some pigment molecules of the six species plant extracts bound to the hair surface were removed, but dye molecules that had penetrated and bound to the hair fiber did not wash out easily. These results are in agreement with those of Sampaio et al (2010).…”

Evaluation of antimicrobial and dyeing properties of walnut (Juglans regia L.) green husk extract for cosmetics

“…Hydrogen, ionic, and covalent bonds could be formed between reactive methyl, carboxyl, and hydroxyl functional groups in the dye and amino and sulfhydryl groups in hair keratin [21]. The lowest colour strength was produced by lime juice because relatively few disulfide bonds might be broken in an acidic solution.…”

Coloration, Hair

“…Dye diffusion into hair fibers is largely influenced not only by fiber architecture [24], but also its condition [2,26] (i.e., if it is damaged/more porous) as well as the molecular size, shape, and polarity of the dye [4], and solvent employed [3]. Solvents can induce hair fiber swelling and thus enhance free volume within the hair fiber and promote the diffusion of dye within.…”

“…Alternative permanent coloration technologies, despite some individual successes, have yet to prevail over the economy and efficacy of conventional permanent hair dye precursors. One interesting proposed alternative permanent hair coloration technology involves the use of infused biocompatible spherical silica nanoparticles (206 nm average diameter) with commercial red acid dye (Telon Red M-BL) [26]. Sampaio and co-workers adopted this technology and found the nanoparticles penetrated only bleached hair fibers.…”