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'''Disjoining pressure''' (symbol Π<sub>d</sub>), in [[surface chemistry]], according to an [[IUPAC]] definition,<ref>[http://www.iupac.org/goldbook/D01790.pdf "Disjoining pressure". Entry in the IUPAC Compendium of Chemical Terminology ("The Gold Book"), the International Union of Pure and Applied Chemistry, 2nd edition, 1997]</ref> arises from an attractive interaction between two surfaces. For two flat and parallel surfaces, the value of the disjoining pressure (i.e., the force per unit area) can be calculated as the derivative of the [[Gibbs energy]] of interaction per unit area in respect to distance (in the direction [[Surface normal|normal]] to that of the interacting surfaces). There is also a related concept of '''disjoining force''', which can be viewed as disjoining pressure times the surface area of the interacting surfaces.
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The concept of disjoining pressure has been introduced by [[Boris Derjaguin|Derjaguin]] (1936) as the difference between the pressure in a region of a [[phase (matter)|phase]] adjacent to a surface confining it, and the pressure in the bulk of this phase.<ref>A. Adamson, A. Gast, "Physical Chemistry of Surfaces", 6th edition, John Wiley and Sons Inc., 1997, page 247.</ref>
 
== Description ==
Disjoining pressure can be expressed as:<ref name="Butt">Hans-Jürgen Butt, Karlheinz Graf, Michael Kappl,"Physics and chemistry of interfaces", John Wiley & Sons Canada, Ltd., 1 edition, 2003, page 95 [http://books.google.ca/books?id=r-IpcdGJMJEC&pg=PA95&lpg=PA95&dq=%22Disjoining+pressure%22&source=bl&ots=0DXcKQSLCS&sig=ZJmRRnMUld3DQq4WYI_tNjkWrC4&hl=en&ei=tS3uSvC3HoHJlAeOkNX_BA&sa=X&oi=book_result&ct=result&resnum=5&ved=0CB0Q6AEwBDgU#v=onepage&q=%22Disjoining%20pressure%22&f=false (Google books)]</ref>
 
:<math>\Pi_D = - {1 \over A} \left( \frac{\partial G}{\partial x} \right)_{T,V, A} </math>
 
where:
* ''Π<sub>d</sub>'' - disjoining pressure, N/m<sup>2</sup>
* ''A'' - the surface area of the interacting surfaces, m<sup>2</sup>
* ''G'' - total Gibbs energy of the interaction of the two surfaces, J
* ''x'' - distance, m
* indices ''T'', ''V'' and ''A'' signify that the temperature, volume, and the surface area remain constant in the derivative.
 
[[File:Disjoining pressure.png|thumb|150px|right|Dependence of the pressure in the film at surface A and the pressure in the bulk]]
Using the concept of the disjoining pressure, the pressure in a film can be viewed as:<ref name="Butt"/>
 
:<math>P = P_0 + \Pi_D</math>
 
where:
* ''P'' - pressure in a film, Pa
* ''P<sub>0</sub> - pressure in the bulk of the same phase as that of the film, Pa.
 
Disjoining pressure is interpreted as a sum of several interactions: [[dispersion forces]], electrostatic forces between charged surfaces, interactions due to layers of neutral molecules [[adsorption|adsorbed]] on the two surfaces, and the structural effects of the solvent.
 
== See also ==
*[[Capillary condensation]]
*[[Capillary pressure]]
 
== References==
<references/>
 
{{DEFAULTSORT:Disjoining Pressure}}
[[Category:Surface chemistry]]

Latest revision as of 02:34, 18 December 2014

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