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Related Concept Videos

Adsorption Isotherms I01:29

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...
Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

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 solvents...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...

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Related Experiment Video

Updated: May 31, 2026

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
09:48

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

Non-equilibrium dynamics of single polymer adsorption to solid surfaces.

Debabrata Panja1, Gerard T Barkema, Anatoly B Kolomeisky

  • 1Institute for Theoretical Physics, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 23, 2011
PubMed
Summary

Polymer adsorption dynamics on surfaces are influenced by non-equilibrium effects. Weak adsorption is fast, while strong adsorption surprisingly slows down due to polymer stretching.

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Last Updated: May 31, 2026

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Published on: February 27, 2015

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Area of Science:

  • Polymer physics
  • Surface science
  • Statistical mechanics

Background:

  • Polymer adsorption to surfaces is fundamental to many natural processes.
  • Experimental data suggests non-equilibrium effects dominate adsorption dynamics.

Purpose of the Study:

  • Investigate the adsorption dynamics of a single polymer chain to a planar surface.
  • Analyze the influence of adsorption energy on adsorption timescales.
  • Relate adsorption to polymer translocation phenomena.

Main Methods:

  • Theoretical investigation of polymer adsorption without hydrodynamic interactions.
  • Analysis of adsorption timescales based on polymer length (N) and Flory exponent (ν).

Main Results:

  • For weak adsorption, timescales scale as N((1+2ν)/(1+ν)).
  • For high adsorption, timescales scale as N(1+ν) due to polymer stretching.
  • Identified an energy scale separating equilibrium and non-equilibrium regimes.

Conclusions:

  • Adsorption dynamics exhibit distinct regimes based on adsorption energy.
  • Strong adsorption leads to slower dynamics due to polymer stretching.
  • Polymer adsorption shares similarities with field-driven polymer translocation.