Saturated Solutions of M(NO3)2-H2O-CH3OH (M = Sr, Ba) Systems

1994 ◽  
Vol 59 (6) ◽  
pp. 1342-1348
Author(s):  
Mitko D. Stoev ◽  
Jóse M. A. Robledo
Keyword(s):  
Ir Spectra ◽  
Equilibrium Existence ◽  
Solubility Isotherms ◽  
Saturated Solutions

The solubility isotherms of the M(NO3)2 - H2O - CH3OH (M = Sr, Ba) systems at 25 °C have been studied. Crystallization fields of the equilibrium existence of the salts Sr(NO3)2 .4 H2O, Sr(NO3)2 and Ba(NO3)2 have been found. The structures of the saturated solutions on the basis of statistic calculations and IR spectra have been discussed.

Solubility in the Glycine-H3BO3-H2O System

1994 ◽  
Vol 59 (6) ◽  
pp. 1337-1341 ◽  
Author(s):  
Jitka Eysseltová ◽  
Jana Dosoudilová
Keyword(s):  
Boric Acid ◽  
Vapour Pressure ◽  
Pressure Measurements ◽  
Straight Line ◽  
Title System ◽  
Solubility Isotherms ◽  
Saturated Solutions

Solubility isotherms in the title system were measured at 0, 25, 50, and 70 °C. Regression straight line equations interrelating the solubilities of boric acid and glycine were derived. The activity of water in saturated solutions of the system at 25 °C was determined by vapour pressure measurements.

Ionic Processes in Saturated Solutions of MgCl2·6H2O in Solutions of Other Divalent Metals

2001 ◽  
Vol 66 (1) ◽  
pp. 89-98 ◽  
Author(s):  
Jitka Eysseltová
Keyword(s):  
Complex Formation ◽  
Copper Ions ◽  
Chloride Complex ◽  
The Other ◽  
Mercury Ions ◽  
Transfer Energy ◽  
Iron Cobalt ◽  
Usual Procedure ◽  
Solubility Isotherms ◽  
Saturated Solutions

Solubility isotherms of MgCl2·6H2O at 25 °C in solutions of chlorides of bivalent beryllium, calcium, manganese, iron, cobalt, zinc and mercury were treated by the hydration analysis. In addition to the usual procedure, the recently developed modified transfer energy Ξ was used to characterize the situation in saturated solutions. As a result, the following ionic processes were established in the saturated solutions under consideration: competition for water in solutions of MgCl2·6H2O containing beryllium and calcium chloride, complex formation in solutions of MgCl2·6H2O containing manganese, cobalt, zinc and mercury ions and formation of ions with heterogeneous coordination sphere in solutions of MgCl2·6H2O containing iron or copper ions. In the last case, the ability of the formed ions to crystallize from solution was found to be reduced in comparison with the other cases. Activity coefficients of MgCl2 were calculated along the solubility curves under consideration.

Study of the Equilibria in the MCl2-H2O-ROH Systems (M = Co, Ni; ROH = CH3OH, C2H5OH) at 25 °C

1993 ◽  
Vol 58 (4) ◽  
pp. 854-860 ◽  
Author(s):  
Mitko D. Stoev ◽  
Ivanka Zlateva
Keyword(s):  
Equilibrium Existence ◽  
Solubility Isotherms

The solubility isotherms of CoCl2-H2O-CH3OH (C2H5OH) and NiCl2-H2O-CH3OH (C2H5OH) systems at 25 °C have been studied. Crystallization fields of the equilibrium existence of the salts CoCl2 . 6 H2O, CoCl2 . 2 H2O, CoCl2 . 2 CH3OH, CoCl2 . 2.5 C2H5OH, NiCl2 . 6 H2O, NiCl2 . 4 H2O, NiCl2 . 2 H2O, NiCl2 . 3 CH3OH and NiCl2 . 2 C2H5OH have been found. The dehydratation solubility processes of the studied systems have been discussed.

The Influence of the Degree of Organization of Saturated Solutions on the Shape of the Solubility Isotherm

2001 ◽  
Vol 56 (12) ◽  
pp. 865-868 ◽  
Author(s):  
Jitka Eysseltová ◽  
Miroslav Ebert ◽  
Vladimír Zbranek
Keyword(s):  
Saturated Solution ◽  
Solubility Isotherm ◽  
Salt Hydrates ◽  
Solubility Isotherms ◽  
Saturated Solutions

AbstractSpecial features of solubility isotherms of salt hydrates have been observed, from which the evidence of strong organization of saturated solutions of hydrates may be deduced. Often observed low contents of the non saturating component in the eutonic solution limiting the crystallization branch of hydrated salts is put into connection with this result. The composition of the respective eutonic solutions exhibits a correlation with the hydration entropy of the ions present in the ternary saturated solution.

Visualization of ultrasonic cavitation in visible and IR spectra

2010 ◽  
Author(s):  
A. Osterman ◽  
O. Coutier-Delgosha ◽  
M. Hocevar ◽  
B. Sirok
Keyword(s):  
Ir Spectra ◽  
Ultrasonic Cavitation

Light- or Dark-Colored, L-DOPA-Based Melanins

2018 ◽  
Author(s):  
Koen Vercruysse ◽  
Margaret M. Whalen
Keyword(s):  
Human Physiology ◽  
Ir Spectra ◽  
Immune Cells ◽  
Chemical Properties ◽  
Chemical Signature ◽  
Ft Ir

<p>This report is a continuation of previous research on the H<sub>2</sub>O<sub>2</sub>-mediated synthesis of melanin-like pigments. We synthesized and characterized L-DOPA-based pigments using air- or H<sub>2</sub>O<sub>2</sub>-mediated<sub> </sub>oxidation. We compared their physic-chemical properties and evaluated their capacity to affect the interleukin release from immune cells. The use of higher concentrations of H<sub>2</sub>O<sub>2</sub> resulted in melanin-like materials with a distinct chemical signature in their FT-IR spectra and a lighter color. All pigments enhanced the interleukin release from immune cells. The possibility that lighter-colored melanins can be generated is discussed in the context of the importance of melanin-based pigmentation in human physiology.</p>

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