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Related Concept Videos

Diffusion01:12

Diffusion

228.8K
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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Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
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Related Experiment Video

Updated: Mar 20, 2026

Visualizing Diffusional Dynamics of Gold Nanorods on Cell Membrane using Single Nanoparticle Darkfield Microscopy
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Visualization of Diffusion within Nanoarrays.

Yang Liu, Angelika Holzinger1, Peter Knittel1

  • 1Institute of Analytical and Bioanalytical Chemistry, Ulm University , Albert-Einstein-Allee 11, 89081 Ulm, Germany.

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Summary

Visualizing nanoscale ion diffusion is challenging. New methods show pore separation significantly impacts diffusion, revealing overlapped or independent profiles in nanopore arrays.

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Area of Science:

  • Nanotechnology
  • Physical Chemistry
  • Materials Science

Background:

  • Direct experimental characterization of nanoscale diffusion processes is difficult.
  • Understanding these processes is crucial for biology, medicine, and technology.

Purpose of the Study:

  • To experimentally visualize ion diffusion profiles at nanopore orifices.
  • To investigate the impact of interpore distance on diffusion zones in nanopore arrays.

Main Methods:

  • Utilized electrochemically assisted silica deposition at nanointerfaces between two immiscible electrolyte solutions (nanoITIES).
  • Employed combined atomic force-scanning electrochemical microscopy (AFM-SECM) for topography and diffusion imaging.
  • Fabricated nanopore arrays in silicon nitride membranes using focused ion beam (FIB) milling.

Main Results:

  • Observed overlapped diffusion profiles for closely spaced pores (rc/ra ratio of 21 ± 2).
  • Detected independent diffusion profiles for widely spaced pores (rc/ra ratio of 91 ± 7).
  • Silica deposition method showed a single deposit for close pores and individual deposits for spaced pores.

Conclusions:

  • Direct experimental evidence of nanoscale diffusion zones in nanopore arrays was obtained.
  • Pore-pore separation critically influences diffusional transport at the nanoscale.
  • These visualization methods enhance understanding of molecular transport in miniaturized systems.