Novel core-shell structure for colloids made of neutral/polyelectrolyte diblock copolymers and oppositely charged surfactants
Novel core-shell structure for colloids made of neutral/polyelectrolyte diblock copolymers and oppositely charged surfactants
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DOI：
10.1209/epl/i2002-00104-y
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发表时间：
2002-06-01
期刊：
影响因子：
--
通讯作者：
Grillo, I
中科院分区：
文献类型：
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作者：
Hervé, P;Destarac, M;Grillo, I
使用中子和光散射实验，我们表明，中性/cadmium二嵌段共聚物和带相反电荷的表面活性剂在稀水溶液中缔合成胶体聚集体，具有原始的核-壳微观结构。我们已经发现，核心是由密集包装的表面活性剂胶束，最有可能连接它们之间的嵌段。胶体的外部是电晕，由中性链组成。我们建议，这些胶体的形成机制是相同的，在均聚电解质/表面活性剂溶液中报道的缔合过渡。然而，在这里，宏观相分离受到中性链的存在的阻碍。
Using neutron and light scattering experiments, we show that neutral/polyelectrolyte diblock copolymers and oppositely charged surfactants in dilute aqueous solutions associate into colloidal aggregates which have an original core-shell microstructure. We have found that the core is constituted of densely packed surfactant micelles, most likely connected between them by the polyelectrolyte blocks. The outer part of the colloid is a corona and is made of the neutral chains. We suggest that the mechanism of formation of these colloids is identical to that of the associative transition reported in homopolyelectrolyte/ surfactant solutions. However, here, the macroscopic phase separation is hindered by the presence of the neutral chains.