scholarly journals Transition in the Acid–Base Component of Surface Free Energy of Ice upon the Premelting of Its Second Molecular Bilayer

2020 ◽  
Vol 124 (36) ◽  
pp. 19588-19594
Author(s):  
Nathaniel Orndorf ◽  
Saranshu Singla ◽  
Ali Dhinojwala
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Acid Base ◽  
Base Component

Surface Free Energy Change of UV Exposed Composites and Coatings via Acid-Base Interactions

2011 ◽  
Author(s):  
R. Asmatulu ◽  
M. Ghaddar
Keyword(s):  
Free Energy ◽  
Service Life ◽  
Surface Energy ◽  
Surface Free Energy ◽  
Uv Light ◽  
Free Energy Change ◽  
Energy Change ◽  
Acid Base ◽  
Coating Materials ◽  
Base Interaction

Surface free energy of composite and coatings are critically important for the performance of the materials since the change in surface free energies can drastically affect the physical, chemical and physicochemical properties, and hence the service life of them. The characterization of the surface free energy is the key issue to understand the mechanisms of the surface degradation. Acid-base interaction is one way of determining the surface free energy change on these surfaces. In the present study, we exposed composite and coating surfaces to UV light, and then measured the contact angle values using various liquids (e.g., DI water, diiodomethane and glycerol). Using the van Oss approach, we calculated the surface energy changes of the surfaces exposed to the UV light. We found that the surface energy, acidity and basicity of the composite and coating materials were drastically changed as a function of UV exposure time. This study can be useful for the moisture uptake of composites, composite degradation, aging and service life of these products.

Effect of temperature on the surface free energy and acid–base properties of Gabapentin and Pregabalin drugs − a comparative study

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48712-48719 ◽  
Author(s):  
S. Ramanaiah ◽  
Vikram Karde ◽  
P. Venkateswarlu ◽  
Chinmay Ghoroi
Keyword(s):  
Free Energy ◽  
Surface Energy ◽  
Comparative Study ◽  
Surface Free Energy ◽  
Effect Of Temperature ◽  
Temperature Dependent ◽  
Acid Base ◽  
Base Properties

Temperature dependent surface energy variations observed in Gabapentin and Pregabalin drugs.

Surface Free Energy of Boron-Compounds Modified Poplar Veneer

2013 ◽  
Vol 753-755 ◽  
pp. 843-847 ◽  
Author(s):  
Chen Chen Li ◽  
Zhi Yong Qin ◽  
Qian Zhang ◽  
Jiang Zhang Li
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Surface Free Energy ◽  
Sessile Drop ◽  
Untreated Wood ◽  
Initial Contact ◽  
Boron Compounds ◽  
Acid Base ◽  
The Difference ◽  
Better Than

The contact angle of three different reference liquids (i.e. distilled water, diiodomethane, and formamide) was measured by the sessile drop method by gently placing droplet onto the surface of the boron-compounds treated poplar veneer in this study. The permeability of the modified poplar veneer was evaluated. The surface free energy, as well as two components, namely, Lifshizvander Waals(LW) and Acid-base(AB), were calculated by the Acid-base theory, whereas the polar and nonpolar components were calculated according to the OWRK theory. The result shows that the initial contact angle of boron-compounds modified poplar veneer are significantly less than the untreated wood, which indicates that the wettability of boron-compounds polar veneer is better than the untreated wood. The same situation applies to the permeability. In addition, the surface free energy of boron-compounds modified poplar veneer is reduced, but the difference is very small.

Characterisation of acid–base surface free energy components of urea–water solutions

2018 ◽  
Vol 538 ◽  
pp. 774-780 ◽  
Author(s):  
Alexandros Terzis ◽  
Elmar Sauer ◽  
Guang Yang ◽  
Joachim Groß ◽  
Bernhard Weigand
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Acid Base ◽  
Base Surface ◽  
Water Solutions ◽  
Energy Components
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