Difference between revisions of "Electrostatics for Explorting the Nature of Water Adsorption on the Laponite Sheets' Surface"

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== Overview ==
 
== Overview ==
In this work, the topology of the electrostatic potential using density functional theory for periodic systems
+
In this paper, the author studies the nature of the interaction of water with laponite surfaces using the topology of the electrostatic potential using density functional theory for periodic systems as well as an uncharged sheet model. The topological analysis predicts that for uncharged surfaces the adsorption mode is such that the water molecules are adsorbed almost parallel to the surface. For laponite surfaces, where there is a net charge, the adsorption mode involves electrostatic repulsion between the negative lone pairs on the water molecules and the ones on the surface oxygen atoms. As a consequence, the water molecules bind to the surface in a
was used to study the nature of the interaction of water with laponite surfaces; an uncharged sheet model was
+
perpendicular and tilted approach, minimizing the repulsive interactions. The authored also discussed the advantage of using the topology of the electrostatic potential as an efficient method to describe the electrostatic interactions between adsorbates
also used. The topological analysis predicts that for uncharged surfaces the adsorption mode is such that the
+
and surfaces.
water molecules are adsorbed almost parallel to the surface. For laponite surfaces, where there is a net charge,
+
the adsorption mode involves electrostatic repulsion between the negative lone pairs on the water molecules
+
and the ones on the surface oxygen atoms. As a consequence, the water molecules bind to the surface in a
+
perpendicular and tilted approach, minimizing the repulsive interactions. The advantage of using the topology
+
of the electrostatic potential as an efficient method to describe the electrostatic interactions between adsorbates
+
and surfaces is also discussed.
+
  
 
== Summary ==
 
== Summary ==

Revision as of 16:01, 30 September 2009

Entry by Haifei Zhang, AP 225, Fall 2009 (in progress ....)

Overview

In this paper, the author studies the nature of the interaction of water with laponite surfaces using the topology of the electrostatic potential using density functional theory for periodic systems as well as an uncharged sheet model. The topological analysis predicts that for uncharged surfaces the adsorption mode is such that the water molecules are adsorbed almost parallel to the surface. For laponite surfaces, where there is a net charge, the adsorption mode involves electrostatic repulsion between the negative lone pairs on the water molecules and the ones on the surface oxygen atoms. As a consequence, the water molecules bind to the surface in a perpendicular and tilted approach, minimizing the repulsive interactions. The authored also discussed the advantage of using the topology of the electrostatic potential as an efficient method to describe the electrostatic interactions between adsorbates and surfaces.

Summary

References

[1] Electrostatics for Explorting the Nature of Water Adsorption on the Laponite Sheets' Surface Yosslen Aray, Manuel Marquez, Jesus Rodriguez, Santiago Coll, Yamil Simon-Manso, Carlos Gonzalez and David A. Weitz, J. Phys. Chem. 107, 8946-8952 (2003).