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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...
¹H NMR: Long-Range Coupling01:27

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Adsorption Isotherms II01:25

Adsorption Isotherms II

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Related Experiment Video

Updated: May 30, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Random sequential adsorption of coupled three-circle objects for various radius ratios.

Pradip B Shelke1, A V Limaye

  • 1Department of Physics, Ahmednagar College, Ahmednagar, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 30, 2011
PubMed
Summary
This summary is machine-generated.

Random sequential adsorption of three-circle objects follows a power law. Object shape, defined by radius ratio and angle, influences coverage and saturation, governed by nonconvexity and packing efficiency.

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Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Random sequential adsorption (RSA) is a fundamental process for thin film formation.
  • Understanding particle geometry effects is crucial for predicting adsorption behavior.
  • Previous studies often focused on simpler shapes, leaving complex geometries less explored.

Purpose of the Study:

  • To investigate the random sequential adsorption of coupled three-circle objects.
  • To analyze how object geometry, specifically radius ratio and angle, impacts adsorption kinetics and saturation coverage.
  • To determine the relationship between object nonconvexity, packing efficiency, and the final jammed state coverage.

Main Methods:

  • Simulating random sequential adsorption of three-circle objects on a 2D continuum substrate.
  • Analyzing the approach to the jammed state using instantaneous coverage data.
  • Quantifying object geometry through radius ratios (r(2)/r(1)) and angle (θ).
  • Evaluating the degree of nonconvexity (|δ|) and packing efficiency (η).

Main Results:

  • The adsorption process follows a power law: Θ(∞)-Θ(t)~t(-p).
  • The exponent 'p' and jammed state coverage Θ(∞) are dependent on the object's radius ratio and angle.
  • Saturation coverage is governed by the interplay between the object's degree of nonconvexity and its packing efficiency.

Conclusions:

  • The geometry of adsorbed objects significantly influences the kinetics and equilibrium coverage in RSA.
  • Nonconvexity and packing efficiency are key parameters determining the maximum packing density for complex shapes.
  • This study provides insights into the packing behavior of non-trivial shapes in adsorption processes.