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Extraction: Effects of pH00:53

Extraction: Effects of pH

503
Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...
503

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两性聚合物的对相隔二元混合物的影响:一项DPD模拟研究.

Avinash Chauhan1, Dorothy Gogoi2, Sanjay Puri2

  • 1Department of Physics, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh 221005, India.

The Journal of chemical physics
|November 22, 2023
PubMed
概括

两性聚合物显著改变二元流体相分离,影响形态和动力学. 环块共聚物表现出明显的偏离缩放规律,影响生长模式.

科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物科学 聚合物科学
  • 软物质物理学 软物质物理学

背景情况:

  • 二元混合物中的相位分离对于材料性能至关重要.
  • 了解像两性聚合物这样的添加剂的作用是控制这些过程的关键.
  • 之前的研究已经探索了影响相位分离的各种因素,但缺乏对聚合物拓效应的全面分析.

研究的目的:

  • 调查不同两性聚合物 (AP) 拓对二元 (AB) 简体流体 (SF) 混合物的相分离动态的影响.
  • 分析形态的演变,动态缩放函数和特征长度尺度.
  • 阐明这些变化的基本机制,特别是AP结构的作用.

主要方法:

  • 分散粒子动力学 (DPD) 三维模拟 (d=3).
  • AP拓的系统变化:块共聚合物,环块共聚合物 (RCP) 和miktoarm星聚合物.
  • 对形态演化的分析,动态缩放规律 (R(t) ~ t^φ),以及特征长度尺度.

主要成果:

  • 两性聚合物显著改变了简单流体混合物的形态演变.
  • 环块共聚物表现出与动态缩放的突出偏差.
  • 高AP度导致扩散生长,随后是长度尺度和,其变化基于AP约束.

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  • 较低的AP比率显示惯性水力动力增长,没有明显的粘性水力动力系统.

    • 结论:

    • 该研究确立了低表面活性剂影响的二元流体相位分离动力学中水力动态生长模式的存在.
    • 两性聚合物拓是控制相位分离动态和由此产生的形态学的关键因素.
    • 这些发现有助于解决三维系统中理解相位分离的模两可.