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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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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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Drug Absorption Mechanism: Passive Membrane Transport01:23

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Passive transport is a method of drug absorption where small, lipid-soluble drugs can move across the cell membrane. This movement happens along the concentration gradient, which is a natural flow from higher to lower concentration areas. The speed at which the drug moves is directly related to its lipid–water partition coefficient. This means that the more a drug dissolves in lipids, the faster it diffuses or spreads throughout the body. It is important to note that most drugs are either...
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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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Colligative Properties of Electrolytes
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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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Area of Science:

  • Materials Science
  • Chemical Physics
  • Condensed Matter Physics

Background:

  • First-order phase transitions exhibit singularities in thermodynamic properties like specific heat and compressibility.
  • These singularities, termed super-elasticity and super-thermicity, manifest as divergences in second derivatives of Gibbs free energy.
  • Atomic doping introduces chemical potential gradients that can drive phase transformations.

Purpose of the Study:

  • To explore a chemical analogy of singularity effects in phase transitions along the atomic doping axis.
  • To investigate the phenomenon of 'super-susceptibility' in dopant diffusion.
  • To demonstrate this effect in hydrogen diffusion within vanadium dioxide (VO2) during its metal-insulator transition (MIT).

Main Methods:

  • Theoretical analysis of Gibbs free energy derivatives concerning chemical potential (chemical susceptibility).
  • Experimental investigation of hydrogen diffusion across metal-insulator domain walls in VO2.
  • Measurement of energy barriers and diffusion coefficients for hydrogen in VO2.

Main Results:

  • A chemical analogy to super-elasticity and super-thermicity, termed 'super-susceptibility,' was identified.
  • Hydrogen diffusion across VO2's metal-insulator domain walls showed a three-fold higher energy barrier.
  • Hydrogen diffusivity was reduced by over an order of magnitude across these domain walls.

Conclusions:

  • Super-susceptibility leads to significantly retarded atomic diffusion at phase boundaries.
  • The observed effect is attributed to a volumetric energy penalty related to latent heat reduction.
  • This phenomenon is expected to be universal in phase transformations coupled to chemical composition, offering new avenues for material engineering.