scholarly journals Influence of surface treatment of contaminated zirconia on surface free energy and resin cement bonding

2015 ◽  
Vol 34 (1) ◽  
pp. 91-97 ◽  
Author(s):  
Ryo ISHII ◽  
Akimasa TSUJIMOTO ◽  
Toshiki TAKAMIZAWA ◽  
Keishi TSUBOTA ◽  
Takayuki SUZUKI ◽  
...  
Keyword(s):  
Free Energy ◽  
Surface Treatment ◽  
Surface Free Energy ◽  
Resin Cement

scholarly journals Improvement of Laser Transmission Welding of Glass with Titanium Alloy by Laser Surface Treatment

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2060
Author(s):  
Pin Li ◽  
Xingwen Xu ◽  
Wensheng Tan ◽  
Huixia Liu ◽  
Xiao Wang
Keyword(s):  
Free Energy ◽  
Titanium Alloy ◽  
Surface Treatment ◽  
Surface Free Energy ◽  
Laser Surface ◽  
Tensile Fracture ◽  
Laser Surface Treatment ◽  
Laser Transmission Welding ◽  
Fracture Failure ◽  
Welding Strength

Laser surface treatment of the titanium alloy was locally oxidized on the metal surface to improve the joint strength of laser transmission welding of high borosilicate glass with titanium alloy. The results find that the welding strength was increased 5 times. The welding mechanism was investigated by the morphology of the welded parts, the tensile-fracture failure mode, the diffusion of the interface elements, and the surface free energy. The results show that there are many adherents between the titanium alloy and high borosilicate glass after tensile fracture, the welding strength was higher when the laser voltage was 460 V, and the tensile–fracture failure mode is mainly ductile fracture. Element-line scanning analysis revealed that elemental diffusion occurred in the two materials, which is an important reason for the high welding strength. Surface free-energy analysis shows that laser surface treatment improves the surface free energy of titanium alloy, promotes the wettability and compatibility, and increases the welding strength of titanium alloy with glass.

scholarly journals Influence of surface treatment of glass-ionomers on surface free energy and bond strength of resin composite

2013 ◽  
Vol 32 (5) ◽  
pp. 702-708 ◽  
Author(s):  
Eiichiro OTSUKA ◽  
Akimasa TSUJIMOTO ◽  
Toshiki TAKAMIZAWA ◽  
Tetsuya FURUICHI ◽  
Miho YOKOKAWA ◽  
...  
Keyword(s):  
Free Energy ◽  
Bond Strength ◽  
Surface Treatment ◽  
Surface Free Energy ◽  
Resin Composite

scholarly journals Surface Activation of Poly(Methyl Methacrylate) with Atmospheric Pressure Ar + H2O Plasma

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 228 ◽  
Author(s):  
Essam Abdel–Fattah
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Methyl Methacrylate ◽  
Surface Treatment ◽  
Plasma Treatment ◽  
Surface Free Energy ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Plasma Treatment Time ◽  
Pmma Surface

The atmospheric pressure of Ar + H 2 O plasma jet has been analyzed and its effects on the poly(methyl methacrylate) (PMMA) surface has been investigated. The PMMA surface treatment was performed at a fixed gas flow-rate discharge voltage, while varying the plasma treatment time. The Ar + H 2 O plasma was studied with optical emission spectroscopy (OES). Optimum plasma conditions for PMMA surface treatment were determined from relative intensities of Argon, hydroxyl radical (OH), oxygen (O) I emission spectra. The rotational temperature T rot of Ar + H 2 O plasma was determined from OH emission band. The PMMA surfaces before and after plasma treatment were characterized by contact angle and surface free energy measurements, X-ray photoelectrons spectroscopy (XPS), atomic force microscope (AFM) and UV-spectroscopy. The contact angle decreased and surface free energy increased with plasma treatment time. XPS results revealed the oxygen to carbon ratio (O/C) on plasma-treated PMMA surfaces remarkably increased for short treatment time ≤60 s, beyond which it has weakly dependent on treatment time. The carbon C1s peak deconvoluted into four components: C–C, C–C=O, C–O–C and O–C=O bonds and their percentage ratio vary in accordance with plasma treatment time. AFM showed the PMMA surface roughness increases with plasma treatment time. UV-visible measurements revealed that plasma treatment has no considerable effect on the transparency of PMMA samples.

scholarly journals The effect of methods of surface treatment of metal elements on their surface free energy, with a view to the formation of polymer-metal hybrid elements

Polimery ◽  
2020 ◽  
Vol 65 (11/12) ◽  
pp. 816-821
Author(s):  
OLIWIA TRZASKA ◽  
ROMAN WROBLEWSKI ◽  
ALINA CZEKAJ ◽  
JOANNA CZYZ ◽  
JACEK W. KACZMAR
Keyword(s):  
Free Energy ◽  
Surface Treatment ◽  
Surface Free Energy ◽  
Metal Elements ◽  
Polymer Metal

Smectic A-Smectic B interface : faceting and surface free energy measurement

1989 ◽  
Vol 50 (24) ◽  
pp. 3527-3534 ◽  
Author(s):  
P. Oswald ◽  
F. Melo ◽  
C. Germain
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Energy Measurement ◽  
Smectic A

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.

Molecular orientation of liquid aliphatic hydrocarbons on the surface and at the interface with water

1989 ◽  
Vol 54 (12) ◽  
pp. 3171-3186 ◽  
Author(s):  
Jan Kloubek
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Molecular Orientation ◽  
Phase Changes ◽  
Aliphatic Hydrocarbons ◽  
Water Molecules ◽  
Free Energies ◽  
Dispersion Component ◽  
System Water ◽  
Orientation Of Molecules

The validity of the Fowkes theory for the interaction of dispersion forces at interfaces was inspected for the system water-aliphatic hydrocarbons with 5 to 16 C atoms. The obtained results lead to the conclusion that the hydrocarbon molecules cannot lie in a parallel position or be randomly arranged on the surface but that orientation of molecules increases there the ration of CH3 to CH2 groups with respect to that in the bulk. This ratio is changed at the interface with water so that the surface free energy of the hydrocarbon, γH, rises to a higher value, γ’H, which is effective in the interaction with water molecules. Not only the orientation of molecules depends on the adjoining phase and on the temperature but also the density of hydrocarbons on the surface of the liquid phase changes. It is lower than in the bulk and at the interface with water. Moreover, the volume occupied by the CH3 group increases on the surface more than that of the CH2 group. The dispersion component of the surface free energy of water, γdW = 19.09 mJ/m2, the non-dispersion component, γnW = 53.66 mJ/m2, and the surface free energies of the CH2 and CH3 groups, γ(CH2) = 32.94 mJ/m2 and γ(CH3) = 15.87 mJ/m2, were determined at 20 °C. The dependence of these values on the temperature in the range 15-40 °C was also evaluated.

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