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Technical article

Physisorption

Views:733 Date:2015-12-25

Physisorption, that is physical adsorption, is a process in which the electronic structure of the atom or molecule is barely perturbed upon adsoption.

The fundamental interacting force of physisorption is caused by Van der waals force. Even though the interaction energy is very weak (~10–100 meV), physisorption plays an important role in nature. For instance, the van der Waals attraction between surfaces and foot-hairs of geckos provides the remarkable ability to climb up vertical walls. Van der Waals forces originate from the interactions between induced, permanent or transient electric dipoles.

Physisorption, determined by:

- Temperature

- Gas pressure

- Interaction between surface and gas (e.g vapor pressure)

- Surface area


Monolayer adsorption: Langmuir isotherm

Multilayer adsorption: BET theory

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Record No. 110102003097