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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...

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Related Experiment Video

Updated: Jul 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 10, 2014

Particle Size-Driven Transition from Multilayer Aggregates to Ordered Monolayers at Gas Marble Interfaces.

Takanori Yasui¹, Atsushi Nishikawa¹, Sougen Noguchi²

¹Division of Applied Chemistry, Environmental and Biomedical Engineering, Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 30, 2026

Summary

This summary is machine-generated.

Larger stabilizing particles (≥80 μm) form ordered monolayers on gas marbles (GMs), enhancing mechanical stability. Smaller particles form disordered aggregates, impacting GM structure and integrity.

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Area of Science:

Soft matter physics
Colloid science
Materials science

Background:

Gas marbles (GMs) are particle-stabilized dispersed systems with a unique air-in-water-in-air structure.
Understanding the role of stabilizing particle size is crucial for controlling GM properties.

Purpose of the Study:

To investigate how stabilizing particle size influences the structure and mechanical properties of gas marbles.
To establish structure-property-performance relationships in particle-stabilized GMs.

Main Methods:

Synthesis of polystyrene particles with controlled sizes (2–1050 μm) via dispersion and seeded dispersion polymerization.
Surface modification of particles with a steric stabilizer for interfacial adsorption.
Formation and characterization of gas marbles using particles of varying sizes.

Main Results:

Particles ≥80 μm form ordered monolayers on GMs; smaller particles form disordered multilayers.
Hexagonal ordering increases with particle size, indicating enhanced packing regularity.
GM mechanical integrity against impact correlates with particle size, influenced by liquid-substrate gap and potential energy.

Conclusions:

Particle size is a critical parameter controlling the interfacial structure and mechanical stability of gas marbles.
The balance between particle-particle interactions and gravity dictates surface assembly.
Tailoring particle size offers a route to engineer the performance of GMs.