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Adsorption Isotherms II

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...

Adsorption Isotherms I

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 Solids

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...

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Updated: Jun 1, 2026

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

Published on: May 9, 2014

Multidentate adsorbates for self-assembled monolayer films.

Pawilai Chinwangso¹, Andrew C Jamison, T Randall Lee

¹Department of Chemistry, University of Houston, Texas 77204-5003, United States.

Accounts of Chemical Research

|May 27, 2011

Summary

This summary is machine-generated.

Multidentate adsorbates create robust self-assembled monolayers (SAMs) with enhanced stability and novel compositions. These advanced SAMs overcome limitations of traditional alkanethiol films, enabling new applications in surface engineering and nanoparticle stabilization.

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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

Self-assembled monolayers (SAMs) are widely used for surface engineering.
Alkanethiols on gold are common but lack stability at elevated temperatures.

Purpose of the Study:

To explore multidentate adsorbates for creating more stable and versatile SAMs.
To investigate novel thin-film compositions using chelating adsorbates.

Main Methods:

Design and synthesis of multidentate adsorbates (bidentates and tridentates).
Formation of SAMs on planar substrates and nanoparticles.
Characterization of film stability and composition.

Main Results:

Multidentate adsorbates form SAMs with enhanced stability via the chelate effect.
These robust films withstand conditions unsuitable for traditional SAMs.
Chelating adsorbates enable homogeneously mixed multicomponent surfaces, avoiding phase separation.

Conclusions:

Multidentate adsorbates offer a pathway to highly stable and precisely tunable SAMs.
This approach expands SAM applications in areas like corrosion resistance and nanoparticle stabilization.
Homogeneously mixed films provide new opportunities for designing functional interfaces.