Gas-solid chromatography. A method of measuring surface free energy characteristics of short glass fibers. 1. Through adsorption isotherms

1982 ◽  
Vol 21 (2) ◽  
pp. 337-341 ◽  
Author(s):  
Carol Saint Flour ◽  
Eugene Papirer
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Adsorption Isotherms ◽  
Glass Fibers ◽  
Energy Characteristics ◽  
Measuring Surface ◽  
Short Glass

Surface free energy characteristics of polyfluorinated silane films

Langmuir ◽  
1992 ◽  
Vol 8 (4) ◽  
pp. 1195-1198 ◽  
Author(s):  
Elek Lindner ◽  
Ernest Arias
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Energy Characteristics

scholarly journals Epoxyorganosilane Finishing Compositions for Fibrous Fillers of Thermosetting and Thermoplastic Binders

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 59
Author(s):  
Alexey V. Shapagin ◽  
Natalia A. Gladkikh ◽  
Arkadiy A. Poteryaev ◽  
Valentina Yu. Stepanenko ◽  
Uliana V. Nikulova ◽  
...  
Keyword(s):  
Free Energy ◽  
Composite Materials ◽  
Surface Free Energy ◽  
Materials Science ◽  
Sessile Drop ◽  
Inert Atmosphere ◽  
Energy Characteristics ◽  
Urgent Task ◽  
Wide Range ◽  
Epoxy Systems

The development of universal finishing compositions for fibers of various natures is an urgent task for polymer composite materials science. The developed finishes can be used for the fiber reinforcement of polymer matrices with a wide range of surface free energy characteristics. Epoxy systems modified with diaminesilane in a wide concentration range were examined by optical interferometry, FTIR spectroscopy, DSC and the sessile drop technique. It was shown that the partial curing of epoxy resin by diaminesilane at room temperature under an inert atmosphere, followed by contact with air, leads to a significant increase of the surface free energy of the system. Varying the concentration of diaminesilane allows us to effectively regulate the surface free energy of the composition. This makes it possible to use fibers finished with epoxyaminosilane compositions in composite materials based on a various thermosetting and thermoplastic binders with a surface tension of up to 75 mJ/m2.

Influence of duration of phosphoric acid pre-etching on bond durability of universal adhesives and surface free-energy characteristics of enamel

2016 ◽  
Vol 124 (4) ◽  
pp. 377-386 ◽  
Author(s):  
Akimasa Tsujimoto ◽  
Wayne W. Barkmeier ◽  
Toshiki Takamizawa ◽  
Hidehiko Watanabe ◽  
William W. Johnson ◽  
...  
Keyword(s):  
Free Energy ◽  
Phosphoric Acid ◽  
Surface Free Energy ◽  
Energy Characteristics ◽  
Universal Adhesives ◽  
Bond Durability

scholarly journals Application of cyanated asphaltenes in gas-phase adsorption processes for removal of volatile organic compounds

2019 ◽  
Vol 74 (3) ◽  
pp. 995-1008
Author(s):  
Maksymilian Plata-Gryl ◽  
Malwina Momotko ◽  
Sławomir Makowiec ◽  
Grzegorz Boczkaj
Keyword(s):  
Free Energy ◽  
Adsorption Capacity ◽  
Surface Free Energy ◽  
Adsorption Isotherms ◽  
Retention Volume ◽  
Scale Up ◽  
Breakthrough Curves ◽  
Proton Acceptor ◽  
Acceptor Interaction ◽  
Gas Phase Adsorption

Abstract The paper presents an innovative, chemically modified (methylcyanated) asphaltene-based adsorbent that can be an interesting low-cost alternative for traditional adsorbents. Adsorption properties of adsorbents were examined by inverse gas chromatography technique, adsorption isotherms, and breakthrough curves. A significant increase in retention volume for pyridine, 2-pentanone, nitropropane, toluene, and 1-butanol was observed. Rohrschneider–McReynolds constants revealed an increase in strength of interactions as a result of the modification, especially in strong proton–acceptor interaction (by a factor of 4.6). The surface-free energy of asphaltene adsorbents increased from 136.71 to 169.95 mJ m−2 after modification. It is similar to the surface-free energy of silica or alumina. Moreover, modified adsorbent shows very high adsorption potential for pyridine. Adsorption isotherms revealed that monolayer adsorption capacity for pyridine increased 1.5 times after modification. Breakthrough curves of pyridine indicate that chemical modification increased the adsorption capacity, removal efficiency, and throughput. Scale-up calculations revealed that adsorption column packed with modified asphaltene adsorbent would be almost two times smaller compared to a column packed with unmodified one. Graphic abstract

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