Solubilization of Some Synthetic Perfumes by Anionic-Nonionic Mixed Surfactant Systems. 1

Solubilization Site of Organic Perfume Molecules in Sodium Dodecyl Sulfate Micelles: New Insights from Proton NMR Studies

“…The aqueous solution solubilizing the perfume becomes transparent, and the perfumes are stabilized. Although some studies have been performed using perfumes and surfactants to measure the maximum additive concentration (MAC) and the distribution coefficient between micellar and bulk phase (27,28), there have been no reports of NMR studies to date addressing the solubilization site of solubilizate in micelles. In the present study, solubilization sites of four synthetic perfumery molecules in SDS micelles are investigated.…”

Comparison of the Coadsorption of Benzyl Alcohol and Phenyl Ethanol with the Cationic Surfactant, Hexadecyl Trimethyl Ammonium Bromide, at the Air–Water Interface

“…H and D have vastly different neutron scattering lengths, and D/H isotopic substitution can be used to manipulate ρ(z); this is the essence of the use of the technique to determine adsorbed amounts in mixtures and to determine surface structure to a resolution ∼2Å. At the simplest level D/H isotopic substitution is used to highlight the surface layer and enables the determination of adsorbed amounts in complex mixtures over a broad range of concentrations (4)(5)(6)(7)(8)(9)(10)(11)(12). For a deuterated surfactant in null reflecting water, nrw (a 92 mol% H 2 O/8 mol% D 2 O mixture with a refractive index of unity), the specular reflectivity arises only from the adsorbed layer.…”

“…Assuming that the contribution from the h-pe to the reflectivity is negligible ( b for h-pe is much less than b for dC 16 dTAB, see Table 1), then using Eq. [4] (described earlier) we can evaluate the amount of C 16 TAB at the interface. The results are summarised in Fig.…”

“…The bulk properties of such mixtures and how perfumes interact with surfactants in aqueous solution are important, and such studies have been undertaken (4). However, an important aspect of product performance in such systems is the delivery of perfume to the surface or interface, and an understanding of the surface or interfacial properties is of vital importance.…”

A Narrow Bicontinuous Microemulsion Domain in Mixed Polymeric Silicone Systems

“…Earlier, the formation and characterization of microemulsion formulations, mostly based on hydrocarbon oils and medium-chain alcohols as cosurfactants, have been studied extensively. Due to low surface tension, excellent spreading capacity on the substrate, and giving a unique dry-lubricant feel to surfaces such as hair and skin, silicone-based oils are gaining much popularity in the cosmetics as skin and body care products [8][9][10] . The preparation of O/W droplet type microemulsion of polydimethyl-siloxane compounds is extremely difficult task due to spreading tendency of polymeric silicone chain.…”