Abstract
Contact angles of water droplet on as-grown Z, +X, –X, and m faces of synthetic quartz crystals with growth term of 20 and 48 days, and polished Z, +X, –X, Y, and 45° cut faces of synthetic quartz crystal were observed. The average of the contact angles on as-grown Z, +X, and –X faces increased with the growth term, and they were larger than that on polished Z, +X, and –X faces. On the other hand, the average of the contact angles of water on m face decreased with the growth term, and they were smaller than that on polished Y cut face. Growth rate of the faces of synthetic crystals was measured and the order of growth rate was, m < –X < +X < Z. Specific surface free energy (SSFE) was calculated using Neumann’s equation. The SSFE of polished face was in the order of, m < –X < +X < Z, which corresponds to the order of the growth rate. The SSFE was larger for the face with larger growth rate.
Highlights
Specific surface free energy (SSFE) is significant value to discuss crystal growth thermodynamically, and SSFE is well discussed theoretically
One of the experimental trials to determine the surface energy of quartz crystal was performed by Brace and Walsh [1]
A single crystal of synthetic quartz was grown at NDK Co., Ltd., by the industrial hydrothermal method using NaOH solution [10] [11]
Summary
Specific surface free energy (SSFE) is significant value to discuss crystal growth thermodynamically, and SSFE is well discussed theoretically. One of the experimental trials to determine the surface energy of quartz crystal was performed by Brace and Walsh [1]. Experimental study for SSFE of polymer surface using contact angle of liquid is well known and widely accepted [2]-[5]. (2014) Specific Surface Free Energy of As-Grown and Polished Faces of Synthetic Quartz. We determined the SSFE of as-grown face of synthetic quartz crystal [8] and natural quartz crystals [9]. The surface of as-grown quartz crystal has hillocks, and hillocks have some different faces. This time we determine the SSFE of polished cut plates in order to investigate the SSFE of flat face of quartz crystal
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