分离式水性德克斯-聚乙烯糖醇溶液的自我一致的场分析: (2) 吸附和湿
F A M Leermakers1, L Ruiz-Martínez1, S D Stoyanov2
1Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, Wageningen 6708 WE, The Netherlands.
The journal of physical chemistry. B
|October 14, 2025
概括
接近表面的水性双相系统 (ATPS) 呈现出复杂的湿和位移过渡. 该研究揭示了聚合物相互作用和溶剂条件如何驱动这些行为,影响表面相位过渡.
科学领域:
- 物理化学 物理化学
- 表面科学是一门学科.
- 聚合物科学 聚合物科学
背景情况:
- 水性双相系统 (ATPS) 是水连续的聚合物分离系统,常见的例子是德克斯-水-聚-乙烯糖醇 (PEG).
- 了解在固体接口附近的ATPS行为对于分离科学和生物材料的应用至关重要.
研究的目的:
- 使用理论建模,研究ATPS在固体接口附近的吸附行为和相位过渡.
- 分析聚合物-聚合物相互作用和散装成分对湿和聚合物移位现象的影响.
主要方法:
- 利用Scheutjens Fleer的自一致场 (SF-SCF) 理论,在固体接口附近建模ATPS.
- 在不同散装体积分的溶剂或德克斯下分析了少数成分 (PEG) 的吸附异温体.
主要成果:
- 在超临界条件下确定了明显的湿化和聚合物位移过渡,包括预湿过渡和第一阶层表面相过渡.
- 证明了德克斯和PEG之间的强烈排斥性相互作用导致类似跳跃的位移过渡.
- 观察到溶剂质量差异可能导致连续的过渡:一个平滑的位移,然后是预湿过渡.
- 由于相之间的界面张力较低,发现了部分湿的小参数窗口.
- 在现实的ATPS场景中展示了多次湿过渡 (部分湿到湿,然后回到部分湿) 的可能性,然后在现实ATPS场景中进行干燥过渡.
结论:
- 在接口附近的ATPS的行为对相分离和表面相互作用的驱动力非常敏感.
- 理论建模为复杂的表面相变提供了洞察力,包括湿和位移现象.
- 这些发现为控制ATPS针对特定应用的接口属性提供了基础.
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