LXXVII.The freezing-points of concentrated solutions.—Part II.Solutions of formic, acetic, propionic, and butyric acids

1927 ◽  
Vol 4 (23) ◽  
pp. 841-848 ◽  
Author(s):  
Edward Richard Jones ◽  
Chas. R. Bury
Keyword(s):  
Concentrated Solutions ◽  
Freezing Points

scholarly journals II. A new method of determining freezing points

1896 ◽  
Vol 59 (353-358) ◽  
pp. 251-254
Keyword(s):  
Heterogeneous System ◽  
New Method ◽  
Proper Treatment ◽  
Concentrated Solutions ◽  
Freezing Points ◽  
The Subject

The subject of this paper is the best means of determining freezing points in dilute as well as in concentrated solutions. Two things have to be considered: the proper arrangement of equilibrium in the heterogeneous system, and the proper treatment of the instrument used for measuring temperature.

HYDROGEN PEROXIDE AND ITS ANALOGUES: IV. SOME THERMAL PROPERTIES OF HYDROGEN PEROXIDE

1951 ◽  
Vol 29 (10) ◽  
pp. 895-903 ◽  
Author(s):  
William T. Foley ◽  
Paul A. Giguère
Keyword(s):  
Hydrogen Peroxide ◽  
Thermal Properties ◽  
Heat Of Fusion ◽  
Pure Hydrogen ◽  
Platinum Black ◽  
Concentrated Solutions ◽  
Heat Of Vaporization ◽  
Freezing Points ◽  
A Value ◽  
Thermal Data

Using a Bunsen ice calorimeter the following thermal data were obtained for pure hydrogen peroxide:Specific heat of liquid between0°and25°C …................... 0.632 ± 0. 003 cal. per.gm. per degreeSpecific heat of solid between−20°and −10°C.................. 0.41 ± 0.02 cal. per gm. per degreeLatent heat of fusion at meltingpoint, −0.46°C................... 85.83 ± 0.18 cal. per gm.Latent heat of vaporization at 0°C...... 370.17 ± 0.18 cal. per gm.The freezing points of very concentrated solutions of hydrogen peroxide calculated from these data agree closely with the experimental ones. Preliminary measurements of the heat of decomposition of hydrogen peroxide catalyzed by platinum black were also made at 0° and at various concentrations. The results point to 23.54 ± 0.04 kcal. per mole for the heat of the reaction[Formula: see text]a value slightly higher than those found by previous experimenters.

Molecular Transformations in DNA under the Influence of UV-radiation

2020 ◽  
Vol 04 ◽  
Author(s):  
Vigen G. Barkhudaryan ◽  
Gayane V. Ananyan ◽  
Nelli H. Karapetyan
Keyword(s):  
Uv Radiation ◽  
Uv Irradiation ◽  
Absorption Spectroscopy ◽  
Calf Thymus Dna ◽  
Dilute Solutions ◽  
Concentrated Solutions ◽  
Buffer Solution ◽  
Low Concentration ◽  
Calf Thymus ◽  
Dna Solutions

Background: The processes of destruction and crosslinking of macromolecules occur simultaneously under the influence of ultraviolet (UV) radiation in synthetic polymers, dry DNA and their concentrated solutions. Objective: The effect of UV radiation on calf thymus DNA in dilute solutions subjected to UV- irradiation was studied in this work. Method: The calf thymus DNA was studied in dilute solutions using viscometry, absorption spectroscopy and electrophoresis. Results: It was shown, that at a low concentration of DNA in the buffer solution ([DNA] = 85 μg / ml) under the influence of UV radiation, the processes of destruction of macromolecules and an increase in their flexibility predominate, which is accompanied by a gradual decrease in the viscosity of their solution. In addition, due to the low concentration of the solution, intramolecular crosslinking of macromolecules predominates, which also reduces their size and, consequently, the viscosity of the solution. Conclusion: It was concluded, that in dilute DNA solutions, due to the predominance of the processes of intramolecular crosslinking of macromolecules over intermolecular, only constant processes of decreasing the sizes of DNA macromolecules occur. As a result, its solubility remains virtually unchanged during UV irradiation. The described comments are also excellently confirmed by the results of absorption spectroscopy and electrophoresis

Viscosity, electrical conductivity and density of the system ammonium nitrate-dimethyl sulphoxide

1984 ◽  
Vol 49 (5) ◽  
pp. 1109-1115
Author(s):  
Jindřich Novák ◽  
Zdeněk Kodejš ◽  
Ivo Sláma
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Transport Properties ◽  
Calcium Nitrate ◽  
Dimethyl Sulphoxide ◽  
Present System ◽  
Empirical Equations ◽  
Concentrated Solutions ◽  
Nitrate Solutions

The density, viscosity, and electrical conductivity of highly concentrated solutions of ammonium nitrate in dimethyl sulphoxide have been determined over the temperature range 10-60 °C and the concentration range 7-50 mol% of the salt. The variations in the quantities as a function of temperature and concentration have been correlated by empirical equations. A comparison is made between the transport properties for the present system, aqueous solutions of ammonium nitrate, and calcium nitrate solutions in dimethyl sulphoxide.

scholarly journals Towards an understanding of induced-charge electrokinetics at large applied voltages in concentrated solutions

2009 ◽  
Vol 152 (1-2) ◽  
pp. 48-88 ◽  
Author(s):  
Martin Z. Bazant ◽  
Mustafa Sabri Kilic ◽  
Brian D. Storey ◽  
Armand Ajdari
Keyword(s):  
Concentrated Solutions ◽  
Induced Charge
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