Stimuli-induced core-corona inversion of micelles of water-soluble poly(sodium 2-(acrylamido)-2-methyl propanesulfonate-b-N-isopropylacrylamide)
Stimuli-induced core-corona inversion of micelles of water-soluble poly(sodium 2-(acrylamido)-2-methyl propanesulfonate-b-N-isopropylacrylamide)
复制标题
DOI：
10.1016/j.polymer.2010.05.004
复制
发表时间：
2010-06-24
期刊：
影响因子：
4.6
通讯作者：
Nakashima, Kenichi
中科院分区：
文献类型：
--
作者：
Guragain, Sudhina;Bastakoti, Bishnu R.;Nakashima, Kenichi
用动态光散射、扫描电镜、透射电镜和Zeta电位等技术研究了聚（2-（丙烯酰胺基）-2-甲基丙磺酸钠-b-N-异丙基丙烯酰胺）（PAMPS-b-PNIPAM）在水溶液中的胶束行为。结果发现，PAMPS-b-PNIPAM产生两种不同类型的胶束结构;一种是PAMPS-core/PNIPAM-corona结构，另一种是PNIPAM-core/PAMPS-corona结构。通过在室温下用三价铁离子（Fe 3+）使PAMPS嵌段不溶来获得具有PNIPAM-冠的PAMPS-核心胶束，并且通过在不存在Fe 3+离子的情况下将溶液温度提高到PNIPAM嵌段的低临界溶解温度（LCST）以上来获得具有PAMPS-冠的PNIPAM-核心胶束。我们还发现，从一种类型到另一种类型的反转是可逆的。从PAMPS-核心胶束到PNIPAM-核心胶束的转化是通过使用乙二胺四乙酸去除Fe 3+离子，然后升高温度高于PNIPAM嵌段的LCST来诱导的，而逆转化是通过在较低温度下添加Fe 3+离子来触发的。(C)2010爱思唯尔有限公司保留所有权利。
Micelles of poly(sodium 2-(acrylamido)-2-methylpropanesulfonate-b-N-isopropylacrylamide) (PAMPS-b-PNIPAM) have been investigated in aqueous solutions using various techniques including dynamic light scattering, scanning electron microscopy, transmission electron microscopy and zeta-potential measurements. It was found that PAMPS-b-PNIPAM produces two distinct types of micelle structures; one is a PAMPS-core/PNIPAM-corona structure and the other is a PNIPAM-core/PAMPS-corona structure. The PAMPS-core micelle with the PNIPAM-corona was obtained by insolubilizing the PAMPS block with ferric ion (Fe3+) at room temperature, and the PNIPAM-core micelle with the PAMPS-corona was obtained by increasing the solution temperature above the lower critical solution temperature (LCST) of the PNIPAM block in the absence of the Fe3+ ion. We have also found that the inversion from one type to the other is reversible. The transformation from the PAMPS-core micelle to the PNIPAM-core micelle was induced by removing Fe3+ ion using ethylenediaminetetraacetic acid followed by elevating the temperature above the LCST of the PNIPAM block, while the reverse transformation was triggered by adding Fe3+ ion at a lower temperature. (C) 2010 Elsevier Ltd. All rights reserved.