Enthalpies of Solution of C-Alkylresorcin[4]arenes in Water and Acetonitrile: Hydrophilic and Hydrophobic Effects

2019 ◽  
Vol 123 (17) ◽  
pp. 3763-3768
Author(s):  
Diana C. Riveros ◽  
Glenn Hefter ◽  
Edgar F. Vargas
Keyword(s):  
Enthalpies Of Solution ◽  
Hydrophobic Effects

Heats of Solution of Some Sodium and Potassium Salts in Water and in Water-Methanol Mixtures

1992 ◽  
Vol 57 (11) ◽  
pp. 2227-2234 ◽  
Author(s):  
Ján Benko ◽  
Oľga Vollárová
Keyword(s):  
Transfer Functions ◽  
Enthalpies Of Solution ◽  
Potassium Salts ◽  
Solvent Interactions ◽  
Heats Of Solution ◽  
Solvent Molecules ◽  
Sodium And Potassium

The enthalpies of solution ∆Hs0 were determined for NaSCN, KSCN, NaBrO3, KBrO3, NaClO3, KClO3, NaIO4, KMnO4, KNO2 and NaNO2 in water-methanol mixtures. The transfer functions ∆Ht0 of the salts and anions were calculated based on the extrathermodynamic TPTB assumption. The ∆Ht0 values of the anion obtained from the sodium and potassium salts were compared. The differences observed, particularly at higher concentrations of the cosolvent, are discussed with respect to the interactions between the solvent molecules and the solute-solvent interactions.

Chalcogen Bonding and Hydrophobic Effects Force Molecules into Small Spaces

2020 ◽  
Vol 142 (12) ◽  
pp. 5876-5883 ◽  
Author(s):  
Faiz-Ur Rahman ◽  
Demeter Tzeli ◽  
Ioannis D. Petsalakis ◽  
Giannoula Theodorakopoulos ◽  
Pablo Ballester ◽  
...  
Keyword(s):  
Hydrophobic Effects

Apparent molar volumes and enthalpies of solution of tetracyanoethylene in some solvents and of butan-1-ol in n-octane at different concentrations

2000 ◽  
Vol 10 (2) ◽  
pp. 49-51 ◽  
Author(s):  
Vladimir D. Kiselev ◽  
Elena A. Kashaeva ◽  
Mahdy S. Shihaab ◽  
Alexander I. Konovalov
Keyword(s):  
Apparent Molar Volumes ◽  
Enthalpies Of Solution ◽  
Molar Volumes

Internal temperature elevation of a closed power cycle's input heat resulting from differentials in excess enthalpies of solution

2013 ◽  
Vol 26 (3) ◽  
pp. 343-346
Author(s):  
David Van Den Einde
Keyword(s):  
Second Law Of Thermodynamics ◽  
Working Fluid ◽  
Enthalpies Of Solution ◽  
Excess Enthalpies ◽  
Temperature Elevation ◽  
Internal Temperature ◽  
Power Cycle ◽  
The Difference ◽  
Gas Expansion ◽  
Cycle Efficiency

A closed power cycle using a supercritical solvent and solid solute as its working fluid is described. The difference in excess enthalpies of solution between high and low solvent densities caused by retrograde solubility in the supercritical region serves to internally elevate the temperature of a portion of the cycle's Q1 heat input before that energy affects gas expansion. The effect this internal temperature elevation has on cycle efficiency poses a dilemma for accepted definitions of the second law of thermodynamics.

Enthalpies of solution of two Meisenheimer σ-adducts and tetrabutylammonium bromide in DMSO

2003 ◽  
Vol 406 (1-2) ◽  
pp. 185-190 ◽  
Author(s):  
Andrey V Kustov ◽  
Elena N Alifanova ◽  
Olga Yu Lapina ◽  
Valeriy P Korolev
Keyword(s):  
Tetrabutylammonium Bromide ◽  
Enthalpies Of Solution

Gamma-Ray Radiation-Induced Surface Hydrophobic Effects in Invar Alloy

2012 ◽  
Vol 482-484 ◽  
pp. 1585-1591 ◽  
Author(s):  
Cheng Fu Yang ◽  
Wei Wen Wang ◽  
Hsin Hwa Chen ◽  
Wei Tan Sun ◽  
Chi Lin Shiau ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Structural Changes ◽  
Gamma Ray ◽  
Small Deviation ◽  
Contact Angles ◽  
Invar Alloy ◽  
Hydrophobic Effects ◽  
Post Irradiation ◽  
Radiation Induced ◽  
Gamma Ray Irradiation

In this paper, we report a new phenomenon observed in the gamma-ray radiation-induced hydrophobic effects on an Invar surface: When the Invar alloy is subjected to different doses of gamma-ray irradiation, the contact angle increases with the radiation dose. Invar samples with exposed to a higher dose appear more hydrophobic, but this tendency disappears following post-irradiation etching. The contact angles of the irradiated and etched Invar samples can be restored back to a stable value with small deviation after 30 min of annealing at 150°C. X-ray diffraction (XRD) analysis found no crystalline structural changes. High resolution field emission scanning microscope (FE-SEM) analyses showed that irradiation might induce crack-like surfaces which could be removed at higher radiation dose in the following acid etchings. It is believed that the chemical bonds of Invar oxide on the surface were broken by the gamma-ray irradiation, thus raising the likelihood of binding with free ions in the air and resulting in the exclusion of the hydrophilic OH bonds, leaving a hydrophobic post-irradiation Invar surface.

Some remarks concerning hydrophobic effects parameters

1992 ◽  
Vol 200 ◽  
pp. 99-107 ◽  
Author(s):  
Stefania Taniewska-Osińska ◽  
Małgorzata Jóźwiak ◽  
Leokadia Kamińska-Bartel
Keyword(s):  
Hydrophobic Effects
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