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Related Concept Videos

Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Distillation: Vapor–Liquid Equilibria01:01

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Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
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Analyte Adsorption and Distribution01:09

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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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Distribution of Molecular Speeds

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The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
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Updated: Dec 9, 2025

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
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Diffusion processes in homogeneous and phase-separated binary fluid mixtures.

Frédérick Roussel1, Patrick Judeinstein2

  • 1Laboratoire de Dynamique et Structure des Matériaux Moléculaires, CNRS (UMR8024), Université des Sciences et Technologies de Lille, U.F.R. de Physique, P5, Villeneuve d'Ascq, 59655, France. frederick.roussel@univ-lille1.fr.

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Summary
This summary is machine-generated.

Dynamic diffusion in polymer-liquid crystal mixtures reveals distinct molecular mobilities. This study highlights how phase separation and polymer chain dynamics are interconnected, impacting material behavior near critical temperatures.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Polymer Physics

Background:

  • Dynamically asymmetric binary fluid mixtures, such as polystyrene (PS) and 5CB liquid crystals, exhibit complex phase behavior.
  • Understanding diffusion dynamics is crucial for predicting material properties and morphology evolution.

Purpose of the Study:

  • To investigate diffusion processes in PS/5CB mixtures near the phase-separation temperature.
  • To elucidate the relationship between phase separation, polymer chain mobility, and dynamic heterogeneity.

Main Methods:

  • Pulsed-field gradient spin echo Nuclear Magnetic Resonance (NMR) spectroscopy was employed.
  • Diffusion coefficients were measured across a range of temperatures, including slow cooling and deep quenches.
  • Echo attenuation curves were modeled to estimate characteristic length scales.

Main Results:

  • Two distinct self-diffusion coefficients (Dfast and Dslow) were observed, corresponding to molecules in the polymer matrix and phase-separated domains, respectively.
  • Simultaneous phase separation and loss of polymer chain mobility at the glass transition temperature (Tg) were noted.
  • The temperature dependence of Dfast followed Arrhenius behavior under slow cooling and Vogel-Fulcher-Tamman-Hesse law under deep quenches, indicating dynamic heterogeneities.

Conclusions:

  • The study demonstrates significant dynamic heterogeneities in PS/5CB mixtures below the upper critical solution temperature (UCST).
  • Elasticity plays a critical role in sample morphology during phase separation.
  • NMR is effective in characterizing diffusion and estimating length scales in complex fluid mixtures.