Thermal Anomaly in the Temperature Dependence of the Energy–Volume Coefficient of Aqueous KCl Solutions

1973 ◽  
Vol 51 (12) ◽  
pp. 1885-1888 ◽  
Author(s):  
Ikchoon Lee ◽  
J. B. Hyne
Keyword(s):  
Aqueous Solution ◽  
Temperature Dependence ◽  
Potassium Chloride ◽  
Direct Measurement ◽  
Pure Water ◽  
Pressure Coefficient ◽  
Thermal Anomaly ◽  
Thermal Pressure ◽  
Temperature Range ◽  
Volume Coefficient

The temperature dependence of the energy–volume coefficient of pure water and of aqueous potassium chloride solutions as a function of concentration over the temperature range 10–50 °C has been determined by direct measurement of constant volume thermal–pressure coefficient. The results show that a thermal anomaly exists in the energy–volume coefficient of aqueous solution in the temperature range 30–40 °C and becomes more pronounced as the concentration of solute is increased.

The Thermal Pressure and Energy–Volume Coefficients of the Methyl Alcohol – Water and t-Butyl Alcohol – Water Systems

1971 ◽  
Vol 49 (16) ◽  
pp. 2636-2642 ◽  
Author(s):  
Digby D. Macdonald ◽  
J. B. Hyne
Keyword(s):  
Mole Fraction ◽  
Methyl Alcohol ◽  
Binary Systems ◽  
Pressure Coefficient ◽  
Butyl Alcohol ◽  
Effect Of Temperature ◽  
Thermal Pressure ◽  
Isothermal Expansion ◽  
Alcohol Water ◽  
Volume Coefficient

Thermal pressure and energy–volume coefficients have been determined for various methyl alcohol – water and t-butyl alcohol – water mixtures at several temperatures in the range 19–55 °C. The energy–volume coefficient is found to pass through a maximum at 0.3–0.4 mole fraction methyl alcohol and 0.1 mole fraction t-butyl alcohol. This behavior is consistent with the average intermolecular distance passing through a minimum in both systems at the corresponding solvent compositions. The relationship between the energy–volume coefficient, the cohesive energy density, and the structure of aqueous binary systems is examined. The temperature dependence of the thermal pressure coefficient is discussed in terms of the effect of temperature on the susceptibility of the entropy of the two systems to isothermal expansion.

Direct Measurement of the Thermal Pressure Coefficient of Water

1962 ◽  
Vol 15 (4) ◽  
pp. 740 ◽  
Author(s):  
GN Malcolm ◽  
GLD Ritchie
Keyword(s):  
Thermal Expansion ◽  
Satisfactory Agreement ◽  
Direct Measurement ◽  
Isothermal Compressibility ◽  
Pressure Coefficient ◽  
Constant Volume ◽  
Thermal Pressure ◽  
Wide Range ◽  
Temperature And Pressure

A constant volume thermometer has been used to measure the thermal pressure coefficient of water over a wide range of temperature and pressure. The results show satisfactory agreement with values calculated from the appropriate data for the coefficients of thermal expansion and isothermal compressibility of water.

The Thermal Pressure and Energy–Volume Coefficients of Dimethyl Sulfoxide – Water Mixtures

1971 ◽  
Vol 49 (4) ◽  
pp. 611-617 ◽  
Author(s):  
Digby D. Macdonald ◽  
J. B. Hyne
Keyword(s):  
Pressure Coefficient ◽  
Liquid System ◽  
Effect Of Temperature ◽  
Thermal Pressure ◽  
Binary Liquid ◽  
Cohesive Energy Density ◽  
Isothermal Expansion ◽  
Volume Coefficient ◽  
Pass Through ◽  
The Relationship

Thermal pressure and energy–volume coefficients are reported for several DMSO–water mixtures over the temperature range 13–55 °C. The energy–volume coefficient at 25 °C is found to pass through a maximum at 0.3–0.4 mole fraction DMSO and this observation is rationalized in terms of maximization of intercomponent interactions. The relationship between the energy–volume coefficient and the cohesive energy density of the binary liquid system is examined. The temperature dependence of the thermal pressure coefficient is discussed in terms of the effect of temperature on the susceptibility of the entropy of DMSO–water mixtures to isothermal expansion.

scholarly journals An estimate of the enthalpic contribution to the interaction between dextran and albumin

1978 ◽  
Vol 175 (2) ◽  
pp. 703-708 ◽  
Author(s):  
W D Comper ◽  
T C Laurent
Keyword(s):  
Aqueous Solution ◽  
Light Scattering ◽  
Temperature Dependence ◽  
Qualitative Agreement ◽  
Interaction Coefficient ◽  
Enthalpy Of Dilution ◽  
Scattering Data ◽  
Temperature Range ◽  
Considerable Error

It is demonstrated that exclusion phenomena appear to dominate the interaction of dextran with albumin in aqueous solution. The enthalpic contribution to the interaction coefficient describing dextran/albumin mixtures is small, although its determination was subject to considerable error. These results support the earlier assumptions of the type of interaction between the two polymers. The conclusions are primarily based on the interpretation of the temperature-dependence of the interaction coefficient, as measured by light-scattering in the temperature range 6–33 degrees C. Enthalpy of dilution measurements of dextran/albumin mixtures by microcalorimetry were in qualitative agreement with the light-scattering data.

Temperature dependence of the shape of the cellodextrins in aqueous solution

1967 ◽  
Vol 45 (20) ◽  
pp. 2363-2367 ◽  
Author(s):  
M. Ihnat ◽  
D. A. I. Goring
Keyword(s):  
Aqueous Solution ◽  
Temperature Dependence ◽  
Computational Methods ◽  
Negative Temperature ◽  
Temperature Range ◽  
Temperature Coefficients ◽  
Increasing Temperature

Intrinsic viscosities of the cellodextrins, cellobiose to cellohexaose, were measured in aqueous solution at temperatures from 25 to 70 °C. Axial ratios were determined using the Einstein–Simha viscosity relation and the computational methods developed previously. The results showed that the oligomers are fully extended over this temperature range and that the negative temperature coefficients of the intrinsic viscosities are caused by the dehydration of the molecules with increasing temperature.

scholarly journals The Effect of Co-Saturated Salts on the Kinematic Viscosity of Water

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Alexei Alexandre Akoulov ◽  
Travis Wiens
Keyword(s):  
Sodium Chloride ◽  
Potassium Chloride ◽  
Kinematic Viscosity ◽  
Water Solution ◽  
Pure Water ◽  
Experimental Measurements ◽  
Nacl Solution ◽  
Temperature Range ◽  
Saturated State ◽  
State Affect

It is well documented in the literature how individual salts such as sodium chloride (NaCl) and potassium chloride (KCl) effect the kinematic viscosity of a water solution. However, there exists little to no information on how the presence of both NaCl and KCl in a co-saturated state affect the kinematic viscosity of the solution. This paper reviews experimental measurements of co-saturated aqueous NaCl:KCl solutions across the temperature range of 20-65 oC at three different concentration ratios. These data are compared to the known kinematic viscosity curves of saturated NaCl solution and pure water from literature.

Salt effect in hydrolysis of 3-acyl-1,3-diphenyltriazenes

1981 ◽  
Vol 46 (12) ◽  
pp. 3104-3109 ◽  
Author(s):  
Miroslav Ludwig ◽  
Oldřich Pytela ◽  
Miroslav Večeřa
Keyword(s):  
Sodium Chloride ◽  
Temperature Dependence ◽  
Potassium Chloride ◽  
Rate Constants ◽  
Zinc Sulphate ◽  
Salt Effect ◽  
Sodium Sulphate ◽  
Potassium Sulphate ◽  
Lithium Sulphate ◽  
Hydrolysis Of

Rate constants of non-catalyzed hydrolysis of 3-acetyl-1,3-diphenyltriazene (I) and 3-(N-methylcarbamoyl)-1,3-diphenyltriazene (II) have been measured in the presence of salts (ammonium chloride, potassium chloride, lithium chloride, sodium chloride and bromide, ammonium sulphate, potassium sulphate, lithium sulphate, sodium sulphate and zinc sulphate) within broad concentration ranges. Temperature dependence of the hydrolysis of the substrates studied has been measured in the presence of lithium sulphate within temperature range 20° to 55 °C. The results obtained have been interpreted by mechanisms of hydrolysis of the studied substances.

Specific features of the temperature dependence of tryptophan fluorescence lifetime in the temperature range of −170–20 °C

2020 ◽  
Vol 393 ◽  
pp. 112435
Author(s):  
Peter P. Knox ◽  
Vladimir V. Gorokhov ◽  
Boris N. Korvatovsky ◽  
Nadezhda P. Grishanova ◽  
Sergey N. Goryachev ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Fluorescence Lifetime ◽  
Tryptophan Fluorescence ◽  
Temperature Range
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