AVS 61st International Symposium & Exhibition
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP10
Wettability of MgO-P2O5 Glasses: Relation between Bulk and Surface Properties

Tuesday, November 11, 2014, 6:30 pm, Room Hall D

Session: Surface Science Poster Session
Presenter: Naoya Yoshida, Kogakuin University, Japan
Authors: N. Yoshida, Kogakuin University, Japan
N. Masuda, Kogakuin University, Japan
M. Yamada, Kogakuin University, Japan
T. Okura, Kogakuin University, Japan
Correspondent: Click to Email
MgO-P2O5 glass system shows anomalous changes in bulk properties, such as density, with changing in its composition; density does not simply

increase with increase of MgO composition, and significantly decreases at around meta composition (50MgO-50P2O5). This phosphorus oxide anomalies derive from local structural changes between tetrametaphosphate and pyrophosphate structures.Wettability, one of the important surface properties, depends on surface energy and surface roughness, therefore, with samples of constant surface roughness, wettability simply reflects surface energy, which relates with chemical composition and structure of the surface.

Here, we prepared MgO-P2O5 glasses with changing composition from 35MgO-65P2O5 to 55MgO-45P2O5, and studied the relation between their bulk properties (density and solubility in water) and wettability. As a result, simple relation was found among wettability, density, and

solubility in water. Of course, wettability is only a surface phenomenon, however, the results suggested that bulk properties are possibly estimated by measurements of wettability. We will discuss the results of other glass systems such as Na2O-B2O3.