Correlation between adhesion of aqueous solutions of nonionic and anionic surfactant mixture with short-chain alcohols to polymer surface and their adsorption at interfaces. II. Critical surface tension of polymer wetting and work of adhesion

2017 ◽  
Vol 74 ◽  
pp. 194-199 ◽  
Author(s):  
Magdalena Bielawska ◽  
Bronisław Jańczuk ◽  
Anna Zdziennicka
Keyword(s):  
Surface Tension ◽  
Aqueous Solutions ◽  
Anionic Surfactant ◽  
Polymer Surface ◽  
Short Chain ◽  
Work Of Adhesion ◽  
Critical Surface ◽  
Surfactant Mixture ◽  
Critical Surface Tension

scholarly journals Wetting properties of the sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and polyoxyethylene (23) lauryl ether (Brij 35) binary mixtures in the poly(tetrafluoroethylene)-solution-air system

2015 ◽  
Vol 70 (1) ◽  
Author(s):  
Joanna Krawczyk
Keyword(s):  
Surface Tension ◽  
Aqueous Solutions ◽  
Binary Mixtures ◽  
Critical Surface ◽  
Surface Wetting ◽  
Critical Surface Tension ◽  
Wetting Properties ◽  
Ptfe Surface ◽  
Brij 35 ◽  
Lauryl Ether

AbstractWettability of poly(tetrafluoroethylene) (PTFE) by aqueous solutions of binary mixtures composed of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) with polyoxyethylene (23) lauryl ether (Brij 35) was considered on the basis of the measured values of contact angle and surface tension. It was shown that the value of the critical surface tension of PTFE surface wetting at the studied system (23.5 mN/m), does not depend on the concentration and composition of the binary mixtures of studied surfactants in water, and it was higer than the surface tension of PTFE (20.2 mN/m). The best wettability of polytetrafluoroethylene (PTFE) by studied aqueous solutions of binary surfactants mixtures occurs at the mixtures concentration corresponding to the critical micelle concentration of their solutions.

Durability of Coatings Based on Sol Silicate Paint

2019 ◽  
Vol 394 ◽  
pp. 1-4
Author(s):  
Valentina Ivanovna Loganina ◽  
Yerkebulan Bisengalievich Mazhitov ◽  
Yuri Petrovich Skachkov
Keyword(s):  
Surface Tension ◽  
Surface Energy ◽  
Intermolecular Interaction ◽  
Frost Resistance ◽  
Hamaker Constant ◽  
Critical Surface ◽  
Freezing And Thawing ◽  
Critical Surface Tension

The results of the study provide information on the resistance of coatings based on the solof silicate paint in the process of freezing and thawing. It was found, that coatings based on sol silicatepaints are characterized by a higher resistance compared of silicate coatings. It is shown, that thecoatings withstood 50 cycles of alternate freezing and thawing. The surface energy of the coatingswas calculated using the critical surface tension of the fluid at the interface with the solid. Thedispersion contribution in the intermolecular interaction between the particles of the coatings wasestimated. The values of the surface tension of the coatings and the values of the dispersioncomponent of the surface energy of the coatings — the complex Hamaker constant — are calculated.It was revealed, that after testing a decrease in the values of the Hamaker constant is observed. It wasestablished, that after testing for frost resistance, the values of the Hamaker constant for coatingsbased on sol of silicate paint are higher compared to coatings based on silicate paint.

Roughness and wettability of aligner materials

2020 ◽  
Vol 47 (3) ◽  
pp. 223-231 ◽  
Author(s):  
Fabienne Suter ◽  
Spiros Zinelis ◽  
Raphael Patcas ◽  
Marc Schätzle ◽  
George Eliades ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Energy ◽  
Work Of Adhesion ◽  
Critical Surface ◽  
Roughness Parameters ◽  
Critical Surface Tension ◽  
Energy Parameters ◽  
Intermediate Group ◽  
Significant Difference

Objective: The characterisation of surface roughness and energy of contemporary thermoplastic materials used in manufacturing of orthodontic aligners. Design: In vitro, laboratory study. Materials and methods: Four commercially available thermoplastic materials were selected (CA-medium/CAM, Essix-copopyester/COP, Duran/DUR and Erkodur/ERK). Five disks from each, as received, material were tested and subjected to: (1) reflected light microscopy; (2) optical profilometry for the estimation of Sa, Sz, Sq, Sdr, Sc, Sv surface roughness parameters (n = 5); and (3) contact angle measurements with a Zisman series of liquids for the estimation of critical surface tension (γC), total work of adhesion (WA), as well as the work of adhesion due to polar (WP) and dispersion (WD) components employing the Zisman method (n = 5/liquid). Thermoformed disks were prepared against a dental stone model and the roughness parameters were calculated again Statistical analysis was performed by one-way ANOVA/ Tukey multiple comparison test and t-test (a = 0.05). Results: Microscopic and profilometric analyses revealed a smooth surface texture in the as-received materials, but a very rough texture after thermoforming, with insignificant differences within each state. Significant differences in the as-received state were found in the surface energy parameters; CAM showed the lowest γC and the highest WA, WP, WD, whereas ERK with the highest γC demonstrated lower WA. COP and DUR were ranked in an intermediate group regarding γC, with a statistically significant difference in WA between them, mainly attributed to the lower WP of the former. Conclusion: Given the differences in surface energy parameters and the lack of roughness differences within the as received or thermoformed groups, it may be concluded that variations in the plaque retaining capacity are anticipated, determined by γC, WA and the WP, WD components.

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