Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, United Kingdom.
Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, United Kingdom; ISIS, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, United Kingdom.
J Colloid Interface Sci. 2016 Mar 15;466:220-6. doi: 10.1016/j.jcis.2015.12.041. Epub 2015 Dec 22.
Enhanced delivery of perfumes to interfaces is an important element of their effectiveness in a range of home and personal care products. The role of polyelectrolyte-surfactant mixtures to promote perfume adsorption at interfaces is explored here. Neutron reflectivity, NR, was used to quantify the adsorption of the model perfumes phenylethanol, PE, and linalool, LL, at the air-water interface in the presence of the anionic surfactant sodium dodecylsulfate, SDS, and the cationic polyelectrolytes, poly(dimethyldiallyl ammonium chloride), polydmdaac, and poly(ethyleneimine), PEI. The strong SDS-polydmdaac interaction dominates the surface adsorption in SDS-polymer-perfume (PE, LL) mixtures, such that the PE and LL adsorption is greatly suppressed. For PEI-SDS-perfume mixtures the PEI-LL interaction competes with the SDS-PEI interaction at all pH at the surface and significant LL adsorption occurs, whereas for PE the PEI-SDS interaction dominates and the PE adsorption is greatly reduced. The use of the strong surface polyelectrolyte-ionic surfactant interaction to manipulate perfume adsorption at the air-water interface has been demonstrated. In particular the results show how the competition between polyelectrolyte, surfactant and perfume interactions at the surface and in solution affect the partitioning of perfumes to the surface.
增强香精在界面处的传递是其在各种家居和个人护理产品中发挥功效的重要因素。本文探讨了聚电解质-表面活性剂混合物在促进香精在界面处吸附方面的作用。使用中子反射率（NR）技术来定量研究模型香精苯乙醇（PE）和芳樟醇（LL）在阴离子表面活性剂十二烷基硫酸钠（SDS）和阳离子聚合物聚（二甲基二烯丙基氯化铵）（polydmdaac）和聚乙烯亚胺（PEI）存在下在气-水界面的吸附。SDS-polydmdaac 之间的强烈相互作用主导了 SDS-聚合物-香精（PE、LL）混合物中的表面吸附，从而大大抑制了 PE 和 LL 的吸附。对于 PEI-SDS-香精混合物，PEI-LL 相互作用在表面和整个 pH 范围内与 SDS-PEI 相互作用竞争，因此会发生显著的 LL 吸附，而对于 PE，则是 PEI-SDS 相互作用占主导地位，PE 的吸附大大减少。已经证明可以利用强表面聚电解质-离子型表面活性剂相互作用来操纵香精在气-水界面处的吸附。特别是，这些结果表明了表面和溶液中聚电解质、表面活性剂和香精相互作用之间的竞争如何影响香精向表面的分配。
