Contact angle and free surface energy of CdS films on polystyrene substrate

2019 ◽  
Vol 463 ◽  
pp. 820-828 ◽  
Author(s):  
Aleksei N. Kolodin ◽  
Alexander I. Bulavchenko
Keyword(s):  
Contact Angle ◽  
Free Surface ◽  
Surface Energy ◽  
Free Surface Energy ◽  
Cds Films

The Influence of Plasma Composition on the Properties of Plasma Treated Biomaterials

2001 ◽  
Vol 672 ◽  
Author(s):  
Nilson C. Cruz ◽  
Elidiane C. Rangel ◽  
Giovana Z. Gadioli ◽  
Rogério P. Mota ◽  
Roberto Y. Honda ◽  
...  
Keyword(s):  
Contact Angle ◽  
Free Surface ◽  
Surface Energy ◽  
Functional Group ◽  
Free Surface Energy ◽  
Material Surface ◽  
Plasma Composition ◽  
Surface Processing ◽  
Bulk Properties ◽  
Biological Environment

ABSTRACTThe response of a biological environment when in contact with an artificial material is primarily determined by the material surface properties such as composition, contact angle and free surface energy [1,2]. Owing to that, different treatments have been employed to improve the performance of biocompatible materials. In this sense, plasma-based techniques are very attractive because they enable the surface processing of materials with virtually any geometry preserving bulk properties. Furthermore, other characteristics make plasma treatment of particular interest in biomaterial processing. Those characteristics include, for instance, a) the possibility of using a large number of different chemicals to introduce any desired functional group on the surface, b) the treatment is performed in an intrinsically sterile environment and, c) different kind of materials (such as ceramics, metals and polymers) including those chemically inert can be treated.

Erosion Due to Incipient Cavitation

1948 ◽  
Vol 158 (1) ◽  
pp. 297-316
Author(s):  
W. T. Bottomley
Keyword(s):  
Free Surface ◽  
Hydrostatic Pressure ◽  
Surface Energy ◽  
Thermal Equilibrium ◽  
Cavitation Erosion ◽  
Cavitation Number ◽  
Free Surface Energy ◽  
Air Bubbles ◽  
Velocity Of Sound ◽  
Supersaturated State

Van Iterson's experiments show that cavitation erosion is produced by the collapse of minute air bubbles in water in a state of air supersaturation. This is contrary to the usual conception that cavitation erosion is due to the collapse of vapour bubbles. The author gives results of experiments which indicate that the bubbles which form and collapse at the stage of incipient cavitation in aerated water are air bubbles in a supersaturated state. The experiments also show that vapour bubbles which collapse in de-aerated water are in thermal equilibrium. It is shown that the collapse of bubbles in thermal equilibrium cannot cause erosion because the vapour pressure inside and the hydrostatic pressure surrounding the bubbles are balanced during collapse. The energy producing cavitation erosion is the free surface energy liberated by the collapse of the air bubbles. The final collapse velocity is the velocity of sound in water and the magnitude of the blow produced is of the order of 120 tons per sq. in. or more. The effect of these views on the interpretation of the model tests in cavitation tunnels and on the cavitation number is discussed.

Study on the free surface energy per unit area of aluminium nanodrops using the schommers potential

2009 ◽  
Vol 50 (6) ◽  
pp. 1171-1176
Author(s):  
N. Yu. Sdobnyakov ◽  
A. N. Bazulev ◽  
V. M. Samsonov ◽  
D. A. Kul’pin ◽  
D. N. Sokolov
Keyword(s):  
Free Surface ◽  
Surface Energy ◽  
Unit Area ◽  
Free Surface Energy

An empirical model for free surface energy of strained solids at different temperature regimes

2006 ◽  
Vol 252 (15) ◽  
pp. 5384-5386 ◽  
Author(s):  
S. Garruchet ◽  
O. Politano ◽  
J.M. Salazar ◽  
A. Hasnaoui ◽  
T. Montesin
Keyword(s):  
Free Surface ◽  
Surface Energy ◽  
Empirical Model ◽  
Free Surface Energy ◽  
Temperature Regimes

Determination of free surface-energy parameters using a spatial method

2013 ◽  
Vol 6 (2) ◽  
pp. 157-159 ◽  
Author(s):  
I. A. Starostina ◽  
O. V. Stoyanov ◽  
N. V. Sokorova
Keyword(s):  
Free Surface ◽  
Surface Energy ◽  
Free Surface Energy ◽  
Energy Parameters ◽  
Spatial Method

scholarly journals Regularities of formation of adhesive contact “sol-silicate paint - substrate”

Vestnik MGSU ◽  
2019 ◽  
pp. 94-101
Author(s):  
Valentina I. Loganina ◽  
Erkebulan B. Mazhitov
Keyword(s):  
Free Energy ◽  
Free Surface ◽  
Surface Energy ◽  
Liquid Glass ◽  
Adhesive Contact ◽  
Interfacial Interaction ◽  
Free Surface Energy ◽  
Properties Of Coatings ◽  
Dispersion Component ◽  
Silicate Paints

Introduction. The use as a binder in the manufacture of silicate paints polysilicate solutions obtained by mixing liquid glass and silica sol is considered. To regulate the rheological properties of the paint, improve the filling and prevent the pigment part from sagging, it has been proposed to introduce glycerin into the binder composition. The results of studying the interfacial interaction between the paint and the substrate are given. Materials and methods. In developing the formulation of silicate paints based on polysilicate solutions, MK-2 microcalcite, marshalite, diatomite and talc of MT-GSM grade were used as a filler, and titanium dioxide as a pigment. Polysilicate solutions were obtained by reacting stabilized solutions of colloidal silica (sols) with aqueous solutions of alkali silicates (liquid glasses). Nanosil 20 and Nanosil 30 silicic acid sol were used, produced by the Promsteklocentr PC. Used potassium liquid glass with module M = 3.29. A thermodynamic method was used to assess the interfacial interaction. Results. Shown that the introduction of glycerol into the formulation of a sol of silicate paint promotes a decrease in the interfacial surface tension and a better wetting of the surface of the mortar substrate. An increase in wetting coefficient is observed. Coatings based on sol silicate paints with the addition of glycerin are characterized by increased crack resistance. An increase in tensile strength, maximum tensile properties, and decrease in the elastic modulus of paint membranes based on the composition with glycerol has been established. The values of the free surface energy of the coating based on the sol of silicate paint and the ratio of the polar to the dispersion component of the free energy of the surface are given. Coatings based on sol of silicate paint with the addition of glycerin are characterized by a large value of the free energy of the surface. In the process of moistening a decrease in the free surface energy is observed due to a decrease in the dispersion component. Conclusions. Studies have shown that the introduction of an additive of glycerin in the formulation of a silicate paint sol contributes to an increase in the performance properties of coatings based on it.

scholarly journals Surface Modification of Additively Manufactured Nitinol by Wet Chemical Etching

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7683
Author(s):  
Denis Nazarov ◽  
Aida Rudakova ◽  
Evgenii Borisov ◽  
Anatoliy Popovich
Keyword(s):  
Mechanical Properties ◽  
Free Surface ◽  
Surface Energy ◽  
Surface Composition ◽  
Three Dimensional ◽  
Physicochemical Characteristics ◽  
Contact Angles ◽  
Free Surface Energy ◽  
Flat Plates ◽  
Water Contact

Three-dimensional printed nitinol (NiTi) alloys have broad prospects for application in medicine due to their unique mechanical properties (shape memory effect and superplasticity) and the possibilities of additive technologies. However, in addition to mechanical properties, specific physicochemical characteristics of the surface are necessary for successful medical applications. In this work, a comparative study of additively manufactured (AM) NiTi samples etched in H2SO4/H2O2, HCl/H2SO4, and NH4OH/H2O2 mixtures was performed. The morphology, topography, wettability, free surface energy, and chemical composition of the surface were studied in detail. It was found that etching in H2SO4/H2O2 practically does not change the surface morphology, while HCl/H2SO4 treatment leads to the formation of a developed morphology and topography. In addition, exposure of nitinol to H2SO4/H2O2 and HCl/H2SO4 contaminated its surface with sulfur and made the surface wettability unstable in air. Etching in NH4OH/H2O2 results in surface cracking and formation of flat plates (10–20 microns) due to the dissolution of titanium, but clearly increases the hydrophilicity of the surface (values of water contact angles are 32–58°). The etch duration (30 min or 120 min) significantly affects the morphology, topography, wettability and free surface energy for the HCl/H2SO4 and NH4OH/H2O2 etched samples, but has almost no effect on surface composition.

Sign in / Sign up

Export Citation Format

Share Document