Inner structure of adsorbed ionic microgel particles.

Inner structure of adsorbed ionic microgel particles.
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吸附离子微凝胶颗粒的内部结构

DOI:
10.1021/la500390j
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发表时间:
2014
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
von Klitzing
von Klitzing
中科院分区:
--
文献类型:
--
作者:
Wellert;Hertle;Richter;Medebach;Magerl;Radulescu;Müller-Buschbaum;Hellweg;von Klitzing

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研究了不同丙烯酸含量的交联聚丙烯酸(nipam -co-丙烯酸)微凝胶颗粒在溶液和吸附状态下的性能。作为衬底,硅与聚(丙烯胺盐酸盐)(PAH)涂层被使用。利用原子力显微镜(AFM)研究了微凝胶颗粒溶胀的温度依赖性。用掠入射小角中子散射(GISANS)检测了吸附微凝胶颗粒的内部结构。在相应的微凝胶悬浮液上进行小角中子散射(SANS)进行比较。尽管聚合物网络的相关长度在散装样品中显示出发散,但在吸附的微凝胶颗粒中,它在整个温度范围内保持不变。此外,GISANS还显示了粒子沿表面法向的变化。这表明固体表面的存在抑制了吸附微凝胶中接近体积相变的内部波动的发散。
Microgel particles of cross-linked poly(NIPAM-co-acrylic acid) with different acrylic acid contents are investigated in solution and in the adsorbed state. As a substrate, silicon with a poly(allylamine hydrochloride) (PAH) coating is used. The temperature dependence of the deswelling of the microgel particles was probed with atomic force microscopy (AFM). The inner structure of the adsorbed microgel particles was detected with grazing incidence small angle neutron scattering (GISANS). Small angle neutron scattering (SANS) on corresponding microgel suspensions was performed for comparison. Whereas the correlation length of the polymer network shows a divergence in the bulk samples, in the adsorbed microgel particles it remains unchanged over the entire temperature range. In addition, GISANS indicates changes in the particles along the surface normal. This suggests that the presence of a solid surface suppresses the divergence of internal fluctuations in the adsorbed microgels close to the volume phase transition.
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