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相关概念视频

Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
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Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Dialysis01:15

Dialysis

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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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相关实验视频

Updated: Jun 30, 2025

Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique

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在二元混合物中脱混合,在高密度下具有差异扩散率.

Erin McCarthy1, Raj Kumar Manna1, Ojan Damavandi1

  • 1Department of Physics and BioInspired Institute, Syracuse University, Syracuse, New York 13244, USA.

Physical review letters
|March 15, 2024
PubMed
概括
此摘要是机器生成的。

不同扩散率驱动粒子混合物在高密度下脱,但这种相位分离在单元的包装分数上方消失,揭示了重新进入的行为. 这一发现与了解细胞分类和组织动态有关.

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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相关实验视频

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科学领域:

  • 物理 物理学 物理
  • 生物物理学的生物物理.
  • 材料科学 材料科学 材料科学

背景情况:

  • 自发相位分离 (脱混合) 对于细胞分类等生物过程至关重要.
  • 在基于粒子的模型中,一个持续存在的问题是,不同的粒子扩散率是否可以诱导脱混合.
  • 之前的研究表明,差异性扩散性导致相位分离,达到0.7.7的包装分数.

研究的目的:

  • 调查差异性扩散能否驱动生物系统相关密度的颗粒混合物中的相分离 (包装分数>0.7).
  • 探索高密度的颗粒混合物的相位行为,包括单位以上的包装分数.
  • 检查产生的作用在高密度相位分离中的作用.

主要方法:

  • 利用基于粒子的模拟来模拟具有不同扩散度的混合物.
  • 研究的系统涉及一系列粒子包装分数,从0.7到1.0以上.
  • 采用一个汇合的Voronoi模型来模拟组织行为.

主要成果:

  • 在0.7和1.0之间的包装分数的颗粒混合物中观察到脱混合.
  • 在包装分数大于单位时,系统仍然混合,这表明相位分离的损失.
  • 对组织的合流沃罗诺伊模型没有表现出相位分离,与模拟结果保持一致.

结论:

  • 不同的扩散性可以诱导高密度的颗粒混合物中的相分离 (包装分数为1.0).
  • 在相位图中观察到重新进入的行为,由于产生的限制,相位分离在密度高于单位时停止.
  • 这些发现表明,简单的粒子模型可能无法完全捕捉密集生物组织中细胞分类的复杂性.