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 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.

Examination of the lubricant storing and releasing ability of thermally sprayed surfaces

2011 ◽  
Vol 2 (2) ◽  
pp. 101-105
Author(s):  
L. Fazekas ◽  
Z. S. Tiba ◽  
G. Kalácska
Keyword(s):  
Free Energy ◽  
Surface Energy ◽  
Surface Free Energy ◽  
Essential Role ◽  
Index Number ◽  
Adhesion Ability ◽  
Thermally Sprayed ◽  
Proper Operation

Abstract The lubricant storing and releasing ability of the thermally sprayed surfaces plays an essential role in the proper operation of the components. In the case of porous sprayed surfaces the lubricant storing and releasing ability depends mainly on porosity and the surface energy (adhesion susceptibility). The adhesion ability can also be expressed indirectly with an index number that is by determining the surface free energy.

Insights into graphene wettability transparency by locally probing its surface free energy

Nanoscale ◽  
2019 ◽  
Vol 11 (16) ◽  
pp. 7944-7951 ◽  
Author(s):  
Jin-You Lu ◽  
Tuza Olukan ◽  
Srinivasa Reddy Tamalampudi ◽  
Abdulrahman Al-Hagri ◽  
Chia-Yun Lai ◽  
...  
Keyword(s):  
Free Energy ◽  
Chemical Vapor Deposition ◽  
Surface Energy ◽  
Surface Free Energy ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Multilayer Graphene ◽  
Natural Graphite

In this work, we study the surface energy of monolayer, bilayer and multilayer graphene coatings, produced through exfoliation of natural graphite flakes and chemical vapor deposition.

Investigation of Template Releasing Energy in Nanoimprint Lithography

2013 ◽  
Vol 1499 ◽  
Author(s):  
Tomoki Nishino ◽  
Norihiro Fujikawa ◽  
Hiroaki Kawata ◽  
Yoshihiko Hirai
Keyword(s):  
Free Energy ◽  
Surface Energy ◽  
Surface Free Energy ◽  
Nanoimprint Lithography ◽  
Perpendicular Direction ◽  
Single Side ◽  
Lift Off ◽  
Releasing Process

ABSTRACTTo investigate template releasing process in nanoimprint lithography, template releasing energy (i.e. surface energy between the template and the resist polymer) in various releasing conditions is evaluated using multi-axial controlled releasing system. The releasing energy is in proportion to the surface free energy of the template, but does not depend on the velocity of releasing. Also, a peeling mode where the template is released from a single side and a lift-off mode where the template is removed in the perpendicular direction to the resist are examined. The result shows that the releasing energy by peeling mode is lower than that by lift-off modes.

The specific energy of crystal boundaries in tin

1950 ◽  
Vol 201 (1065) ◽  
pp. 210-215 ◽  
Keyword(s):  
Free Energy ◽  
Surface Energy ◽  
Specific Surface ◽  
Surface Free Energy ◽  
Specific Energy ◽  
Lattice Theory ◽  
Strong Support ◽  
Crystal Boundary ◽  
The Difference ◽  
Crystal Boundaries

Specimens of tin, consisting of three crystals of predetermined orientations, were prepared with various differences of orientation between two of the crystals. The equilibrium angles between the three boundaries were measured. Relative values of specific surface free energy were deduced from the angles, and it was found that the surface energy decreases progressively as the difference of orientation decreases below about 6°. The curve relating surface energy with differences of orientation extrapolates to zero surface energy at zero angle. The result is considered to provide strong support for the ‘transitional lattice’ theory of the crystal boundary.

Temperature-dependent surface free energy and the Wulff shape of iron and iron carbide nanoparticles: A molecular dynamics study

2020 ◽  
Vol 509 ◽  
pp. 144859 ◽  
Author(s):  
Mengjiao Xing ◽  
Amar-Deep Pathak ◽  
Suchismita Sanyal ◽  
Qing Peng ◽  
Xingchen Liu ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Free Energy ◽  
Surface Free Energy ◽  
Iron Carbide ◽  
Wulff Shape ◽  
Temperature Dependent
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