Studies on nucleation from solution of some soluble inorganic salts

1970 ◽  
Vol 48 (18) ◽  
pp. 2896-2899 ◽  
Author(s):  
J. A. Velazquez ◽  
O. E. Hileman Jr
Keyword(s):  
Constant Temperature ◽  
Selective Extraction ◽  
New Method ◽  
Crystal Nucleation ◽  
Inorganic Salts ◽  
Nucleation Parameters ◽  
Solutions Of Electrolytes

Vonnegut's droplet technique in combination with selective extraction of solvent is reported as a new method for the study of nucleation from solution of soluble substances at constant temperature. The method is applied to studies on NH4Cl, NH4NO3, NH4SCN, (NH4)2Cr2O7, and K2Cr2O7,. The results are reported and various nucleation parameters are calculated and discussed in terms of the limitations of the Becker–Doring model of nucleation when it is applied to crystal nucleation from solutions of electrolytes.

scholarly journals The exploration of the crystal nucleation parameters and physico-chemical analysis of a single crystal: 2-amino-4,6-dimethoxypyrimidinium hydrogen (2R,3R)-tartrate 2-amino-4,6-dimethoxypyrimidine

RSC Advances ◽  
2021 ◽  
Vol 11 (26) ◽  
pp. 15710-15721
Author(s):  
Paavai Era ◽  
RO. MU. Jauhar ◽  
V. Viswanathan ◽  
M. Madhangi ◽  
G. Vinitha ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Single Crystal ◽  
Chemical Properties ◽  
Crystal Nucleation ◽  
Nucleation Parameters ◽  
Physico Chemical

This paper discusses the structural orientations and the physico-chemical properties of a single crystal of 2-amino-4,6-dimethoxypyrimidinium hydrogen (2R,3R)-tartrate 2-amino-4,6-dimethoxypyrimidine (2ADT).

scholarly journals A method for the selective extraction of histone fractions f2(a)1 and f2(a)2 from calf thymus deoxyribonucleoprotein at pH7

1967 ◽  
Vol 105 (2) ◽  
pp. 611-614 ◽  
Author(s):  
E W Johns
Keyword(s):  
Acid Solution ◽  
Selective Extraction ◽  
New Method ◽  
Guanidinium Chloride ◽  
Histone Fraction ◽  
Acetone Precipitation ◽  
Calf Thymus

1. A new method has been developed for the specific extraction of histone fraction f2(a) from calf thymus deoxyribonucleoprotein at pH7 by using a mixture of ethanol and guanidinium chloride. 2. Fraction f2(a) has been separated into the subfractions f2(a)1 and f2(a)2 by acetone precipitation from acid solution, and at pH7. 3. Modifications of existing electrophoretic methods are described that enable these fractions to be more easily characterized.

scholarly journals Impurities and Homogeneous Crystal Nucleation in Aqueous Solutions - An Overview

2019 ◽  
Vol 16 (3) ◽  
pp. 198-208
Author(s):  
C. K. Mahadevan
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Research Group ◽  
Present Author ◽  
Crystal Nucleation ◽  
Nucleation Process ◽  
Nucleation Parameters ◽  
The Past ◽  
Homogeneous Crystal ◽  
Made In

Nucleation process is the most important stage in the formation of a crystal and has attracted the attention of researchers due to its importance in many technological and biological contexts. As the presence of impurities affects the nucleation process significantly, several studies have been made in the past to understand it. In this article is presented an overview of various studies made to understand the effect of soluble impurities on the crystal nucleation parameters of certain important materials in aqueous solution focusing the results reported by the research group of the present author.

Hydrothermal Synthesis of Nano-γ-MnOOH Using Complexes

2013 ◽  
Vol 320 ◽  
pp. 265-269
Author(s):  
Lin Ma ◽  
Li Zhen Yang ◽  
Fu Yun Li
Keyword(s):  
Hydrothermal Synthesis ◽  
Metal Complexes ◽  
Reaction Temperature ◽  
New Method ◽  
Inorganic Salts ◽  
Preparation Process ◽  
Reaction Products ◽  
Hydrothermal Conditions ◽  
Structure And Morphology

The paper gains a new method for the synthesis of γ-MnOOH crystals by adding ethylenediamine metal complexes under hydrothermal conditions. Study the effect of different preparation process to the reaction products .The structure and morphology of the resultant products were characterized by using XRD, SEM. The results show that the product is α-MnO2 when did not join the ethylenediamine metal complexes and the product is γ-MnOOH when joined the ethylenediamine metal complexes in 100°C under hydrothermal conditions. The purity of the γ-MnOOH is not the same when adding different ethylenediamine metal complexes. Inorganic salts will reduce the purity of the product and a new Mn3O4 crystal can be prepared by increasing the reaction temperature to 180°C.

A new method for analysis of constant-temperature thermal response tests

Geothermics ◽  
2019 ◽  
Vol 78 ◽  
pp. 1-8 ◽  
Author(s):  
Murat Aydin ◽  
Mustafa Onur ◽  
Altug Sisman
Keyword(s):  
Constant Temperature ◽  
Thermal Response ◽  
New Method

Effect of Temperature on Activity of Salvelinus fontinalis

1942 ◽  
Vol 5c (5) ◽  
pp. 461-470 ◽  
Author(s):  
Paul F. Elson
Keyword(s):  
Constant Temperature ◽  
Laboratory Experiments ◽  
Salvelinus Fontinalis ◽  
New Method ◽  
Effect Of Temperature ◽  
Field Observations ◽  
Maximal Amount ◽  
Sigmoid Curve

The distances moved in response to varied stimuli are measured, at constant temperature, by a new method. A sigmoid curve shows the relation between strength of stimulus and distance moved. For any strength of stimulus maximal amount of movement occurs at about 10 °C. Laboratory experiments and field observations reveal response temperatures (more active behaviour of the fish) at 15 and 20°, which may somewhat increase the distance moved at and above these temperatures.

A NEW METHOD FOR SELECTIVE EXTRACTION OF EUGLOBALS WITH MONOTERPENOID STRUCTURE FROM EUCALYPTUS VIMINALIS LEAVES

2019 ◽  
Vol 22 (12) ◽  
Author(s):  
N.N. Boyko ◽  
E.T. Zhilyakova ◽  
D.I. Pisarev ◽  
O.O. Novikov ◽  
P.G. Mizina ◽  
...  
Keyword(s):  
Selective Extraction ◽  
New Method ◽  
Eucalyptus Viminalis

scholarly journals Investigation of temperature effect on the electrical conductivity of alcohol solutionssodium and potassium alcoholates

2020 ◽  
Vol 61 (1) ◽  
pp. 81-85
Author(s):  
Vera A. Petrukhina ◽  
◽  
Pavel I. Fedorov ◽  
Ksenia A. Konnova ◽  
Maria V. Yakimova ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Solutions ◽  
Temperature Dependence ◽  
Isopropyl Alcohol ◽  
Effect Of Temperature ◽  
Inorganic Salts ◽  
Equivalent Conductivity ◽  
Solutions Of Electrolytes ◽  
Weak Electrolytes ◽  
Sodium And Potassium

Earlier, we studied the electrical conductivity of inorganic salts in a number of alcohols (ethanol, propanol-2, and butanol-1) at room temperature and found that alcoholic solutions of inorganic salts are weak electrolytes. It is known that an increase in the temperature of salt solutions leads to an increase in electrical conductivity due to an increase in the mobility of their ions in the solvent medium. To study the temperature dependence of the electrical conductivity of aqueous solutions of electrolytes, we proposed an approach based on the study of the effect of temperature on the equivalent electrical conductivity of solutions at infinite dilution λ∞. Using this approach, we studied the electrical conductivity of aqueous solutions of a number inorganic salts (nitrates, acetates, and phosphates), carboxylic acids, and amino acids as a function of temperature. It was found that for these solutions the dependence λ∞(Т) is described by the exponential Arrhenius equation λ∞ = Аexp(-E/(RT)). This equation was used to describe the temperature dependence of the ultimate equivalent conductivity for solutions of a number of inorganic salts (calcium and nitrate calcium, cadmium, lithium and potassium iodides, chloride, iodide and ammonium nitrate, silver nitrate and sodium bromide) in ethanol. This article investigated and demonstrated the possibility of describing the experimental data λ∞(Т) for solutions of ethylates, propylates and isopropylates of sodium and potassium in the corresponding alcohols (ethylates in ethanol, propylates in propanol, isopropylates in isopropyl alcohol) using the same equation.

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