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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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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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Nano-sized Adsorbate Structure Formation in Anisotropic Multilayer System.

Vasyl O Kharchenko¹, Dmitrii O Kharchenko², Vladimir V Yanovsky³

¹Institute of Applied Physics, National Academy of Sciences of Ukraine, 58 Petropavlivska St., Sumy, Ukraine. vasiliy@ipfcentr.sumy.ua.

Nanoscale Research Letters

|May 10, 2017

Summary

This summary is machine-generated.

An electric field drives the self-organization of adatoms into nano-sized islands on a substrate in plasma-condensate systems. This structural transformation from nano-holes to islands is observed in numerical simulations.

Keywords:

Nanostructured thin films Nanostructures Pattern formation Plasma-condensate system

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

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Published on: May 9, 2014

Area of Science:

Plasma Physics
Materials Science
Surface Science

Background:

Adsorbate island formation is crucial in thin film deposition and surface patterning.
Plasma-condensate systems involve complex interactions between plasma species and condensed matter.
Understanding adatom dynamics is key to controlling nanostructure morphology.

Purpose of the Study:

To numerically investigate the dynamics of adsorbate island formation in a model plasma-condensate system.
To derive and analyze a generalized reaction-diffusion model for adsorptive multilayer systems.
To explore the influence of electric field anisotropy on adatom self-organization.

Main Methods:

Numerical simulation of a model plasma-condensate system.
Derivation of a generalized reaction-diffusion model incorporating anisotropic adatom transfer.
Analysis of adsorbate island size dynamics and distributions.

Main Results:

A structural transformation from nano-holes to separated nano-sized adsorbate islands occurs with increasing electric field strength.
The electric field induces anisotropy in adatom transfer between layers.
Detailed analysis of adsorbate island size evolution and their distributions was performed.

Conclusions:

Electric field strength is a critical parameter controlling the morphology of adsorbate structures.
The derived model accurately captures the self-organization of adatoms into nano-islands.
This study offers insights into nanoscale self-organization in anisotropic plasma-condensate systems.