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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

Diffusion

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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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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.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Facilitated Diffusion01:16

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Pore Transport and Ion-Pair Transport01:17

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Facilitated Transport01:19

Facilitated Transport

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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Diffusiophoretic mobility of charge-regulating porous particles.

Wei C Li1, Huan J Keh1

  • 1Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan.

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This study analytically investigates diffusiophoresis in charge-regulating porous particles. Charge regulation significantly impacts particle mobility, leading to potential velocity reversals, unlike in impermeable particles.

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Area of Science:

  • Colloid and Interface Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Diffusiophoresis describes particle motion in response to solute concentration gradients.
  • Charge-regulating porous particles, like polyelectrolyte coils, exhibit complex electrokinetic behavior due to ionizable functional groups.
  • Understanding diffusiophoresis in these systems is crucial for applications in separation science and nanotechnology.

Purpose of the Study:

  • To analytically study the diffusiophoresis of a charge-regulating porous sphere with an arbitrary electric double layer thickness.
  • To investigate the influence of charge regulation on diffusiophoretic mobility.
  • To provide a theoretical framework for interpreting experimental data on porous particle transport.

Main Methods:

  • Analytical solution of electrokinetic equations using power-series expansions.
  • Incorporation of a charge regulation model relating fixed charge density to local electric potential.
  • Derivation of diffusiophoretic mobility from a force balance equation.

Main Results:

  • An explicit formula for diffusiophoretic mobility was derived, showing it vanishes at the isoelectric point.
  • Charge regulation effects were found to be significant, depending on particle and electrolyte properties.
  • Multiple reversals in diffusiophoretic velocity direction were predicted with variations in ion concentration.

Conclusions:

  • The study provides the first analytical treatment of diffusiophoresis for charge-regulating porous spheres.
  • Results highlight the distinct behavior compared to impermeable particles, emphasizing the role of porosity and charge regulation.
  • The findings offer valuable insights for designing and interpreting experiments involving charged porous materials in ionic solutions.