Physical Properties of Aqueous Solutions of Sodium Oxalate, Sodium Malonate and Sodium Succinate, II

1952 ◽  
Vol 55 (2) ◽  
pp. 223 ◽  
Author(s):  
Robert Taft ◽  
Frank H. Welch
2004 ◽  
Vol 108 (36) ◽  
pp. 13789-13795 ◽  
Author(s):  
Andrew Tromans ◽  
Peter M. May ◽  
Glenn Hefter ◽  
Takaaki Sato ◽  
Richard Buchner

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1400
Author(s):  
Peter Baumli

The paper reviews the preparation of the different metallic nanocomposites. In the preparation of composites, especially in the case of nanocomposites, interfacial phenomena play an important role. This review summarizes the literature on various interfacial phenomena, such as wettability and reactivity in the case of casting techniques and colloidal behavior in the case of electrochemical and electroless methods. The main contribution of this work lies in the evaluation of collected interfacial phenomena and difficulties in the production of metal matrix composites, for both nano-sized and micro-sized reinforcements. This study can guide the composite maker in choosing the best criteria for producing metal matrix composites, which means a real interface with good adhesion between the matrix and the reinforcement. This criterion results in desirable mechanical and physical properties and homogenous dispersion of the reinforcement in the matrix.


1925 ◽  
Vol 127 (0) ◽  
pp. 1836-1840 ◽  
Author(s):  
Malcolm Percival Applebey ◽  
Percival Glyn Davies

1971 ◽  
Vol 24 (4) ◽  
pp. 675 ◽  
Author(s):  
WW Mansfield

The properties of anomalous aqueous condensates, prepared in the manner described by Deryagin,1 vary with aqueous vapour pressure. The changes of column length and of melting point are similar to those of ordinary aqueous solutions. There is no sound evidence that the condensate exhibits abnormal viscosity, density, electrical conductivity, or surface tension.


1978 ◽  
Vol 24 (12) ◽  
pp. 1567-1573 ◽  
Author(s):  
J. W. Fitzgerald ◽  
L. C. Kight-Olliff ◽  
G. J. Stewart ◽  
N. F. Beauchamp

The Kreb's cycle intermediates and related metabolites (e.g., acetate) repressed the induced synthesis of alkylsulfatase in resting cell suspensions of Pseudomonas aeruginosa. At concentrations which caused substantial repression, sodium succinate as well as sodium malate, fumarate, and α-ketoglutarate were oxidized to yield consistently high levels of ATP throughout the induction period. Sodium oxalacetate which was markedly less effective as a metabolite repressor generated high ATP levels only during the first 2 h of the induction period. The addition of 2,4-dinitrophenol or sodium malonate to cell suspensions containing the inducer (sodium hexan-1-yl sulfate) and succinate overcame repression of alkylsulfatase formation and resulted in a reduction in the ATP content to levels found in cells exposed only to inducer. An apparent stimulation of alkylsulfatase induction occurred in the absence of succinate when cells were incubated with 2,4-dinitrophenol and inducer. In this case, the ATP content of the cell suspension fell to levels substantially below those occurring as a result of inducer catabolism. Collectively, these data suggest that the effectiveness of succinate as a metabolite repressor is related to the ATP levels generated as a consequence of succinate oxidation.


2018 ◽  
Vol 253 ◽  
pp. 250-258 ◽  
Author(s):  
Nur Ani Kartikawati ◽  
Rizwan Safdar ◽  
Bhajan Lal ◽  
Muhammad Ibrahim Bin Abdul Mutalib ◽  
Azmi Mohd Shariff

Author(s):  
L.A. Morozova ◽  
S.V. Savel’ev

For the first time, an ultra-high-sensitivity method for measuring radio-thermal radiation was developed and used in practice in order to establish the difference in the physical properties of aqueous solutions of substances in the millimeter region of the spectrum. The method is used to study the dynamics of the dielectric properties of aqueous solutions depending on the composition of the base substance and its concentration. The dynamics of dielectric properties establishes a one-to-one correspondence between the number and concentration of ions of the dissolved basic substance contained in water and the number of water molecules involved in cooperative interaction, which gives a consistent microscopic picture of ion-water cooperative interactions in the studied aqueous solutions of K2SO4 and Cs2SO4. The density of water molecules perturbed by the ions of the base substance contained in the hydration shell at normal concentrations is proportional to the number of ions, while the transition to weaker solutions leads to the creation of multilayer hydration shells. This means that the number of perturbed water molecules, depending on the number of ions, increases according to a law different from linear. In accordance with the experimental data, the values of the absorption coefficients of aqueous solutions were determined in a wide range of concentrations for alkali metal sulfates. It is noted that alkali metal sulfates have physical properties that generalize the dynamics of dielectric constants depending on the concentration of the base substance. A monotonic increase in the values of the absorption coefficients of solutions with a decrease in the concentration of basic substances in the region of high dilutions was established with individual dynamics for each basic substance, reflecting the total hydration changes in salt solutions. Research has shown that the proposed method for measuring radio-thermal radiation fixes a significant difference in the values of the dielectric constants of aqueous solutions at high dilutions from their values for water.


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