Measurement of specific surface free energy of ruby and quartz single crystals using contact angle of liquids

2007 ◽  
Vol 42 (12) ◽  
pp. 1217-1221 ◽  
Author(s):  
Takaomi Suzuki ◽  
Naoki Sugihara ◽  
Eiichi Iguchi ◽  
Katsuya Teshima ◽  
Shuji Oishi ◽  
...  
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Specific Surface ◽  
Single Crystals ◽  
Surface Free Energy

Specific surface free energy of ruby single crystals from Mo- and Pb-based flux

2010 ◽  
Vol 312 (8) ◽  
pp. 1210-1212 ◽  
Author(s):  
Takaomi Suzuki ◽  
Eiichi Iguchi ◽  
Hisashi Soga
Keyword(s):  
Free Energy ◽  
Specific Surface ◽  
Single Crystals ◽  
Surface Free Energy

Specific Surface Free Energy of Ruby Thin Film Grown on Sapphire Single Crystals Studied by Contact Angle of Liquid Droplet

2007 ◽  
Vol 1054 ◽  
Author(s):  
Takaomi Suzuki ◽  
Shintaro Sugane ◽  
Miki Hidaka ◽  
Katsuya Teshima ◽  
Shuji Oishi
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Free Energy ◽  
Specific Surface ◽  
Surface Free Energy ◽  
Sapphire Substrate ◽  
Evaporation Rate ◽  
Liquid Droplet ◽  
Contact Angles ◽  
Crystal Surfaces

ABSTRACTRuby thin film was grown on sapphire substrate by evaporation method of MoO3 flux. Small amount of Na2CO3 was added in order to decrease the evaporation rate of flux. The contact angles of liquids and crystal surfaces were measured for water and formamide droplets, and the specific surface free energy of each face of the crystal was calculated using Fowkes approximation and Wu's mean equations. The growth hillocks on the synthesized thin film were observed. The addition of Na2CO3 incrased the density of hillocks and the specific surface free energy was larger for the ruby thin film, which has larger number of hillocks.

Within-tree variations in the surface free energy of wood assessed by contact angle analysis

2011 ◽  
Vol 46 (1-3) ◽  
pp. 287-298 ◽  
Author(s):  
Davide Rossi ◽  
Sergio Rossi ◽  
Hubert Morin ◽  
Antonio Bettero
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Surface Free Energy ◽  
Contact Angle Analysis

Hydrophobic and Oleophilic Filter Paper for Oil/Water Separation

2019 ◽  
Vol 798 ◽  
pp. 385-390
Author(s):  
Sunisa Jindasuwan ◽  
Sitthisuntorn Supothina
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Surface Free Energy ◽  
Water Contact Angle ◽  
Filter Paper ◽  
Diesel Oil ◽  
Selective Removal ◽  
Water Contact ◽  
Water Separation ◽  
Filter Papers

The separation of oil from water is significance for environmental de-pollution application. To obtain selectivity of liquid, filter papers were coated to bear highly hydrophobic and oleophilic functionality that can allow only oils to pass through them. The coating solutions were prepared by mixing poly(methylhydro siloxane, PMHS) and fumed silica at various proportions. To determine an optimum coating condition, properties of the treated filter papers were investigated by measuring water contact angle and surface free energy, examining surface morphology and testing for selective removal of diesel oil from water. The optimum coating solution was at the PMHS:fumed silica weight ratio of 1.25:1.00. The treated filter paper exhibited high hydrophobicity with water contact angle of 142.80 ± 0.36 degrees and surface free energy of 0.78 mJ/m2. In addition, it exhibited high selective removal of diesel oil from water with oil absorption capacity of 2.3 g/g.

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