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<strong>Thermodynamic study of C<sub>2</sub>H<sub>2</sub> thin films adsorbed on graphite (0001)</strong>

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Title Statement <strong>Thermodynamic study of C<sub>2</sub>H<sub>2</sub> thin films adsorbed on graphite (0001)</strong>
 
Added Entry - Uncontrolled Name Trabelsi, Mohsen ; Département de physique
 
Uncontrolled Index Term adsorption; thermodynamic ; phase transition; atomic and molecular physiscs
Volumetric adsorption isotherms; Bi-dimensional phase; Commensurate structure
 
Summary, etc. Thermodynamic properties of C<sub>2</sub>H<sub>2</sub> thin films adsorbed on (0001) surfaces of an exfoliated graphite substrate have been investigated by means of volumetric adsorption isotherms technique. A complete isotherm of C<sub>2</sub>H<sub>2</sub> adsorbed on graphite shows five steps with different height. Such steps represent a transition from a (2D) dilute phase to a (2D) dense one. For each step, a set of adsorption isotherms is measured. Clapeyron equations P:f(1/T) are then determined and thermodynamic quantities are calculated and compared to the literature available ones. The second step is divided into two sharp steps at a given range of temperature which means that the condensed matter undergoes two phase transitions. The nature of such phases is discussed in light of thermodynamic quantities. The molecules orientation in the suggested structures seems to be governed by quadrupole-quadrupole interaction. Recent neutron diffraction measurements support thermodynamic conclusions.
 
Publication, Distribution, Etc. Indian Journal of Pure & Applied Physics (IJPAP)
2015-09-02 13:27:10
 
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http://op.niscair.res.in/index.php/IJPAP/article/view/2174
 
Data Source Entry Indian Journal of Pure & Applied Physics (IJPAP); ##issue.vol## 53, ##issue.no## 9 (2015): Indian Journal of Pure & Applied Physics
 
Language Note en
 
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