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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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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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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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In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
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Passive Diffusion: Overview and Kinetics01:17

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
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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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Uphill diffusion in multicomponent mixtures.

Rajamani Krishna1

  • 1Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands. r.krishna@contact.uva.nl.

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This summary is machine-generated.

Uphill diffusion, where substances move against their concentration gradient, occurs in complex mixtures due to coupled transport. This phenomenon enables unique material behaviors and separations not predicted by standard Fick

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Molecular diffusion is fundamental to chemical, physical, and biological processes.
  • Fick's law typically describes diffusion down a concentration gradient.
  • Coupled transport in multicomponent mixtures can lead to non-Fickian behavior.

Purpose of the Study:

  • To review and highlight diverse scenarios of uphill diffusion.
  • To explain the driving forces and mechanisms behind uphill transport.
  • To discuss the implications of uphill diffusion in various applications.

Main Methods:

  • Review of existing literature on molecular diffusion and multicomponent transport.
  • Analysis of thermodynamic non-idealities and chemical potential gradients.
  • Examination of electro-neutrality constraints in ionic solutions.
  • Case studies in liquid mixtures, alloys, ceramics, glasses, distillation, and adsorption.

Main Results:

  • Uphill diffusion arises from strong coupling between species fluxes in non-ideal mixtures.
  • Chemical potential gradients, not just concentration gradients, drive uphill transport.
  • Observed phenomena include transient overshoots, serpentine trajectories, and entry into metastable zones.
  • Applications include enhanced separations in distillation and adsorption processes.

Conclusions:

  • Uphill diffusion is a critical phenomenon in multicomponent systems, deviating from Fick's law.
  • Understanding coupled transport is essential for predicting and utilizing uphill diffusion.
  • This phenomenon offers novel pathways for materials processing and separation technologies.