探究季铵盐配方中的竞争相互作用。

Probing competitive interactions in quaternary formulations.

机构信息

Faculty of Science and Engineering, University of Greenwich, Medway Campus, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK.

Science and Technology Facilities Council, ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 OQX, UK.

出版信息

J Colloid Interface Sci. 2015 Sep 15;454:35-43. doi: 10.1016/j.jcis.2015.04.068. Epub 2015 May 11.

DOI:10.1016/j.jcis.2015.04.068

PMID:26002337

Abstract

HYPOTHESIS

The interaction of amphiphilic block copolymers of the poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) group with small molecule surfactants may be "tuned" by the presence of selected alcohols, with strong interactions leading to substantial changes in (mixed) micelle morphology, whilst weaker interactions lead to coexisting micelle types.

EXPERIMENTS

The nature and the strength of the interactions between Pluronic P123 (EO20PO70EO20) and small molecule surfactants (anionic sodium dodecylsulfate, SDS, C12SO4Na), (cationic dodecyltrimethylammonium bromide, C12TAB) and (non-ionic polyoxyethylene(23)lauryl ether, Brij 35, C12EO23OH) is expected to depend on the partitioning of the short, medium and long chain alcohols (ethanol, hexanol and decanol respectively) and was probed using tensiometry, pulsed-gradient spin-echo nuclear magnetic resonance (PGSE-NMR) and small-angle neutron scattering (SANS).

FINDINGS

The SANS data for aqueous P123 solutions with added alcohols were well described by a charged spherical core/shell model for the micelle morphology. The addition of the surfactants led to significantly smaller, oblate elliptical mixed micelles in the absence of alcohols. Addition of ethanol to these systems led to a decrease in the micelle size, whereas larger micelles were observed upon addition of the longer chain alcohols. NMR studies provided complementary estimates of the micelle composition, and the partitioning of the various components into the micelle.

摘要

假设

聚（环氧乙烷）-聚（环氧丙烷）-聚（环氧乙烷）（PEO-PPO-PEO）嵌段共聚物与小分子表面活性剂的相互作用可以通过选择的醇的存在来“调节”，强相互作用导致（混合）胶束形态发生实质性变化，而较弱的相互作用则导致共存的胶束类型。

实验

Pluronic P123（EO20PO70EO20）与小分子表面活性剂（阴离子十二烷基硫酸钠，SDS，C12SO4Na）、（阳离子十二烷基三甲基溴化铵，C12TAB）和（非离子聚氧乙烯（23）月桂醚，Brij 35，C12EO23OH）之间的相互作用的性质和强度预计取决于短链、中链和长链醇（乙醇、己醇和癸醇）的分配情况，并使用张力计、脉冲梯度自旋回波核磁共振（PGSE-NMR）和小角中子散射（SANS）进行了探测。