Heat of transport and heat capacity of transport of some aqueous electrolytes

1988 ◽  
Vol 66 (3) ◽  
pp. 435-438
Author(s):  
S. K. Sanyal ◽  
Ashis K. Mukherjee
Keyword(s):  
Heat Capacity ◽  
Aqueous Solutions ◽  
Thermal Diffusion ◽  
Aqueous Electrolytes ◽  
Heat Of Transport ◽  
Sintered Glass ◽  
A Cell ◽  
Glass Diaphragm

The thermal diffusion of aqueous solutions of NaCl, KCl, MgCl2, BaCl2, MgSO4, and CuSO4 (0.05 m) contained in the pores of a sintered glass diaphragm has been studied. A cell is designed and fabricated for this purpose, and the resulting heat of transport values are compared with those available from the literature and obtained by using independent techniques.

Thermal diffusion of aqueous alcohols

1989 ◽  
Vol 67 (5) ◽  
pp. 867-870
Author(s):  
Ashis Kumar Mukherjee ◽  
S. K. Sanyal
Keyword(s):  
Aqueous Solutions ◽  
Temperature Coefficient ◽  
Thermal Diffusion ◽  
Soret Coefficient ◽  
Local Entropy ◽  
Solvent Interactions ◽  
Solvent Water ◽  
Heat Of Transport ◽  
Sintered Glass ◽  
Experimental Values

The thermal diffusion of aqueous solutions of methanol, ethanol, propan-1-ol, butan-1-ol, ethan-1,2-diol, andpropan-1,2-diol contained in the pores of a sintered glass disc (of porosity G4) has been studied. The Soret coefficient (σ) and the heat of transport [Formula: see text] values are reported in the temperature range of 25–40 °C. The heat capacities of transport are ascertained at 30 °C from the temperature coefficient of heat of transport values. The results are explained on the basis of changes in local entropy in the solvent (water), arising out of solute–solvent interactions. Correlations of the observed experimental values with certain relevant thermodynamic parameters, taken from the literature, have also been sought, with encouraging results. Keywords: thermal diffusion, heat of transport, entropy of hydration.

Heats of transport of some aqueous nonelectrolytes

1986 ◽  
Vol 64 (4) ◽  
pp. 717-719
Author(s):  
A. K. Murkherjee ◽  
S. K. Sanyal
Keyword(s):  
Temperature Gradient ◽  
Aqueous Solutions ◽  
Thermal Diffusion ◽  
Hydrophobic Hydration ◽  
Heat Of Transport ◽  
Sintered Glass ◽  
Glass Disc

The thermal diffusion of aqueous solutions of glucose, sucrose, ethylacetate, and 1,4-dioxan (0.1 m) contained in the pores of a sintered glass disc (or porosity G4), which is subjected to a temperature gradient, has been studied. The resulting heat of transport data have been interpreted, in terms of local changes in entropy in the solvent brought forth by the presence of the solutes, and correlated to the hydrophobic hydration effects.

Temperature dependence of thermal diffusion for aqueous solutions of monosaccharides, oligosaccharides, and polysaccharides

2012 ◽  
Vol 14 (29) ◽  
pp. 10147 ◽  
Author(s):  
Yuki Kishikawa ◽  
Haruka Shinohara ◽  
Kousaku Maeda ◽  
Yoshiyuki Nakamura ◽  
Simone Wiegand ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Temperature Dependence ◽  
Thermal Diffusion

scholarly journals Solubility and Bioactivity of the Pseudomonas Quinolone Signal Are Increased by a Pseudomonas aeruginosa-Produced Surfactant

2005 ◽  
Vol 73 (2) ◽  
pp. 878-882 ◽  
Author(s):  
M. Worth Calfee ◽  
John G. Shelton ◽  
James A. McCubrey ◽  
Everett C. Pesci
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Aqueous Solutions ◽  
Opportunistic Pathogen ◽  
Homoserine Lactone ◽  
Cellular Functions ◽  
Pseudomonas Quinolone Signal ◽  
Serious Infections ◽  
Enhanced Solubility ◽  
Apoptosis Assay ◽  
A Cell

ABSTRACT Pseudomonas aeruginosa is a gram-negative bacterium that causes serious infections in immunocompromised individuals and cystic fibrosis patients. This opportunistic pathogen controls many of its virulence factors and cellular functions through the activity of three cell-to-cell signals, N-(3-oxododecanoyl)-l-homoserine lactone, N-butyryl-l-homoserine lactone, and the Pseudomonas quinolone signal (PQS). The activity of these signals is dependent upon their ability to dissolve in and freely diffuse through the aqueous solution in which P. aeruginosa happens to reside. Despite this, our data indicated that PQS was relatively insoluble in aqueous solutions, which led us to postulate that P. aeruginosa could be producing a PQS-solubilizing factor. In this report, we show that the P. aeruginosa-produced biosurfactant rhamnolipid greatly enhances the solubility of PQS in aqueous solutions. The enhanced solubility of PQS led to an increase in PQS bioactivity, as measured by both a gene induction assay and an apoptosis assay. This is the first demonstration of the importance of a bacterial surfactant in the solubilization and bioactivity of a cell-to-cell signal.

Heat of transport in thermal diffusion of hydrogen in titanium

1969 ◽  
Vol 3 (8) ◽  
pp. 583-584 ◽  
Author(s):  
Masahiro Kitada ◽  
Shigeyasu Koda
Keyword(s):  
Thermal Diffusion ◽  
Heat Of Transport ◽  
Diffusion Of Hydrogen

Apparent molal heat capacities and volumes of aqueous electrolytes at 25 °C: NaClO3, NaClO4, NaNO3, NaBrO3, NaIO3, KClO3, KBrO3, KIO3, NH4NO3, NH4Cl, and NH4ClO4

1978 ◽  
Vol 56 (1) ◽  
pp. 24-28 ◽  
Author(s):  
Alain Roux ◽  
Goolam M. Musbally ◽  
Gérald Perron ◽  
Jacques E. Desnoyers ◽  
Prem Paul Singh ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Infinite Dilution ◽  
Heat Capacities ◽  
Aqueous Electrolytes ◽  
Apparent Molal Volumes ◽  
Hückel Theory ◽  
Standard Values ◽  
Molal Volumes ◽  
Apparent Molal Heat Capacities

Measurements at 25 °C with flow calorimeters and densimeters have led to heat capacities and densities of aqueous solutions of 11 1:1 electrolytes: NaClO3, NaBrO3, NaIO3, NaNO3, NaClO4, NH4NO3, KClO3, KBrO3, KIO3, NH4Cl, and NH4ClO4. The first 6 salts were studied up to near saturation. We have used results of these measurements to obtain apparent molal heat capacities and apparent molal volumes of the various solutes. Extrapolation to infinite dilution on the basis of the Debye–Hückel theory bas led to [Formula: see text]and [Formula: see text] values for each solute. We have compared these standard values with results of earlier investigations.

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