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.

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.

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.

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.

A continuum state variable theory to model the size-dependent surface energy of nanostructures

2015 ◽  
Vol 17 (38) ◽  
pp. 25494-25498 ◽  
Author(s):  
Mostafa Jamshidian ◽  
Prakash Thamburaja ◽  
Timon Rabczuk
Keyword(s):  
Free Energy ◽  
Energy Density ◽  
Surface Energy ◽  
Surface Free Energy ◽  
Free Energy Density ◽  
Continuum State ◽  
Variable Theory ◽  
Size Dependent ◽  
State Variable ◽  
Excess Surface

We propose a continuum-based state variable theory to quantify the excess surface free energy density throughout a nanostructure.

scholarly journals THE EFFECT OF NON-POLYMERIC COMPONENTS OF A RUBBER MIXTURE ON SURFACE PROPERTIES OF ELASTOMER COMPOSITIONS

2018 ◽  
Vol 13 (5) ◽  
pp. 67-72 ◽  
Author(s):  
A. D. Tarasenko ◽  
O. A. Dulina ◽  
A. M. Bukanov
Keyword(s):  
Free Energy ◽  
Surface Energy ◽  
Surface Properties ◽  
Surface Free Energy ◽  
Quantitative Characteristic ◽  
Solubility Limit ◽  
Solution Polymerization ◽  
Rubber Mixture ◽  
Rubber Compounds ◽  
Butadiene Styrene

The effect of non-polymeric components of a rubber mixture on the surface properties of butadienestyrene rubber obtained by solution polymerization was studied in the article. As non-polymeric components, ingredients widely used in the practice of the rubber industry were introduced into the rubber: fillers, surfactants of various types, and also sulfur - as a vulcanization agent. The surface free energy of the samples, a quantitative characteristic of the surface properties, was determined using the Owens-Wendt-Rabel-Kaelble method. It has been found that the surface properties of elastomeric compositions depend significantly on the solubility of the ingredients of the rubber composition and their adsorption properties. It has been shown that the most significant influence on the surface energy of butadiene-styrene rubber is exerted by the filler, on the surface of which rubber adsorption does not occur. The effect of surfactants on the surface energy of rubber compounds is different and depends on the nature of the surfactant. A partially soluble component - sulfur - in small quantities does not affect the surface energy of rubber samples. However, if it is present in the system in quantities greater than the solubility limit, it significantly reduces the surface free energy of the samples.

The influence of paper surface energy on multicolor offset print mottling

TAPPI Journal ◽  
2014 ◽  
Vol 13 (2) ◽  
pp. 55-64 ◽  
Author(s):  
JURAJ GIGAC ◽  
MIROSLAVA KASAJOVÁ ◽  
MONIKA STANKOVSKÁ
Keyword(s):  
Surface Roughness ◽  
Free Energy ◽  
Surface Energy ◽  
Surface Free Energy ◽  
Dynamic Process ◽  
Surface Wetting ◽  
Paper Surface ◽  
Liquid Absorption ◽  
Before And After ◽  
Surface Dynamic

An evaluation of a series of commercial uncoated, semimatte, and glossy coated woodfree papers for the multicolor sheet-fed offset press is presented. This study is aimed at better understanding of mutual influences of surface free energy, paper surface roughness, and fountain solution on print mottling occurring in full-scale printing conditions. Each paper has unique structure in terms of surface roughness, porosity, and surface energy that are the result of manufacturing technology. At the point of contact of liquid with paper, the surface dynamic process of liquid absorption by paper occurs, involving phenomena such as wetting, penetration, diffusion, and swelling. Mottling of colored surface printed by cyan, magenta, yellow, and black inks copied the surface roughness of coated paper. Mottling in the second, third, and fourth printing units showed deviation from mottling in the first printing unit, depending on surface free energy of paper and on the frequency of paper-surface wetting by fountain solution before and after printing.

scholarly journals The saturation and immersion expansions and the heat of wetting

1938 ◽  
Vol 166 (927) ◽  
pp. 572-586 ◽  
Keyword(s):  
Free Energy ◽  
Surface Energy ◽  
Surface Free Energy ◽  
Wood Charcoal ◽  
Surface Phase ◽  
Heat Of Wetting ◽  
Adsorption Equation ◽  
Gibbs Adsorption Equation ◽  
Energy Lowering

In previous papers of this series evidence was advanced that: (i) The expansion which unactivated wood charcoal undergoes when adsorbing gases or vapours is directly proportional to its surface (free) energy lowering (Parts II and III). (ii) The Gibbs adsorption equation, relating the adsorption, the surface energy decrement of the charcoal, and the pressure of the gas, is valid except when a change of surface phase is in progress (Parts II and III).

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