The thermochromism of the Eb>Tb>(30) betaine in a micro-heterogeneous medium: A spectral and dynamics simulation study

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• 作者：Carolina Aliaga ; Luis Briones ; Marcos Caroli Rezende ; Cristiá ; n Tirapegui
• 关键词：Thermochromism ; Solvatochromism ; Micelles ; Poloxamers ; Pluronics ; Molecular dynamics simulation
• 刊名：Journal of Colloid and Interface Science
• 出版年：2010
• 出版时间：15 September 2010
• 年：2010
• 卷：349
• 期：2
• 页码：565-570
• 全文大小：734 K

文摘

A spectral investigation of the thermochromic behavior of Reichardt’s Eb>Tb>(30) betaine in aqueous solutions of block copolymers (“poloxamers”) P407, P237 and P105 was carried out as a function of temperature and concentration. The betaine microenvironment at various stages of the micellization process in these systems was mimicked with the aid of molecular dynamics simulations of model systems. These consisted of the Eb>Tb>(30) probe in boxes of water molecules, in the presence of an isolated block copolymer of formula (PEO)b>11b>–(PPO)b>16b>–(PEO)b>11b>, and of a micelle formed of 50 of these unimers.