Complexation behavior between polyelectrolyte stars and charged colloids

聚电解质星与带电胶体之间的络合行为

• 批准号: 22053299
• 负责人: Professor Dr. Matthias Ballauff
• 金额: --
• 依托单位: Fakultät für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/22053299?language=en
• 关键词: Complexation; behavior; between; polyelectrolyte; stars

The present project deals with the complexation and phase behavior of mixtures consisting of hard, spherical colloidal particles and oppositely charged polyelectrolyte stars (PES). These PEstars result when / polyelectrolyte chains are grafted on a common center. Preliminary simulation results have shown that when a single PES approaches an oppositely charged colloid, a complexation transition of morphological nature takes place. The PES completely attaches itself on the surface of the colloid, assuming thereby a two-dimensional form of a curved starfish that sticks to the colloid surface. Addition of salt causes a gradual unsticking transition of the PES, in which the arms of the latter appear to detach themselves from the colloid surface in a quantized fashion. In the present project, a systematic investigation of the behavior of such mixtures will be undertaken, in which simulations will directly be compared to experimental data. Ways to manipulate the complexation morphologies as well as the phenomenon of overcharging will be looked upon. The macroscopic behavior of concentrated solutions of such systems will be investigated both by theory, employing effective interaction potentials, and by experiment, by carrying out scattering experiments with labeled particles.

本项目研究了由硬的球形胶体粒子和带相反电荷的聚电解质星(PES)组成的混合物的络合和相行为。当聚电解质链嫁接在一个共同的中心上时，这些PEstar就会产生。初步的模拟结果表明，当单个PES接近相反电荷的胶体时，会发生形态上的络合转变。PES完全附着在胶体表面，从而假定为附着在胶体表面的弯曲海星的二维形状。盐的加入导致PES的逐渐脱粘转变，其中后者的臂似乎以量化的方式从胶体表面分离。在本项目中，将对这种混合物的行为进行系统的调查，其中模拟将直接与实验数据进行比较。我们将探讨如何控制络合形态以及电荷过高的现象。利用有效相互作用势从理论和实验两方面研究这类体系浓溶液的宏观行为，并用标记粒子进行散射实验。