Time‐of‐flight secondary ion mass spectrometry analysis of the application of a cationic conditioner to ‘clean’ hair

Abstract

In this study the applicability of the surface‐sensitive Time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) technique to hair analysis and associated aqueous processing is evaluated. ToF‐SIMS analysis of ‘as received’ human hair indicates the presence of silicones, anionic surfactants, and cationic conditioners, from previous treatments, on the fiber surface. Cleaning of the hair with SLS or SLES results in adsorption of the surfactants onto the fiber surface. In particular, the more non‐polar surfactant components have greater substantivity for the fiber surface, as indicated by the relative increase in their ToF‐SIMS intensity. Application of the Incroquat Behenyl 18‐MEA conditioner to both ‘virgin’ and bleached hair results in the adsorption of the cationic C18, C20, C22, and C21 surfactant components onto the hair surface. The ToF‐SIMS data indicate higher levels of conditioner on the bleached hair relative to the undamaged hair.

The impact of detergents on the tissue decellularization process: A ToF-SIMS study

“…Several higher mass peaks also had strong positive loads in PC2. The peak at m/z 265 could be assigned to the SDS molecular ion (C 12 H 25 SO 4 − ), while that at m/z 293 is likely the molecular ion of sodium tetradecyl sulphate (C 14 H 29 SO 4 − ), a common contaminant of SDS [51]. Further principal components of the negative ion spectra did not provide significant separation between treatment groups as can be seen in the scores and loadings plot of PC3, Supplementary Figure 2.…”

ToF‐SIMS characterization of the lipid layer on the hair surface. I: the damage caused by chemical treatments and UV radiation

“…Figure 2 shows the high‐resolution negative ion ToF‐SIMS spectra around m / z 325 for a healthy and bleached hair surface. Previous ToF‐SIMS studies for a keratin fiber surface have indicated that the negative ion peak at m / z 325 is a saturated fatty acid with an alkyl chain length of 21 carbon atoms (C21:0) bound to the hair surface via an ester linkage 11, 12. In the spectrum of the healthy hair, however, the negative ion spectrum around m / z 325 was found to consist of two peaks (Fig.…”

Surface and bulk analysis of bleaching soybean fabric in the presence of protein hydrolysate

“…Protein hydrolysates and protein derivatives have previously been used as softeners/conditioners, wetting, shrink‐resist, and fiber protective agents in wool keratin processing 23–26. In this study, the application of Byco C as a protective agent during the bleaching of soybean fabric was investigated.…”