Comparison of surface activity of organic compounds by the influence of surfactants on reduction peaks by a.c. polarography

1971 ◽  
Vol 243 (2) ◽  
pp. 136-140 ◽  
Author(s):  
S. K. Sharma
Keyword(s):  
Organic Compounds ◽  
Surface Activity

scholarly journals Неоствальдовское поведение дисперсных систем в процессах испарения и кристаллизации капель водно-органических растворов

2020 ◽  
Vol 90 (6) ◽  
pp. 879
Author(s):  
Е.Н. Федосеева ◽  
В.Б. Федосеев
Keyword(s):  
Chemical Composition ◽  
Organic Compounds ◽  
Surface Activity ◽  
Small Volume ◽  
Ostwald Ripening ◽  
Inorganic Salts ◽  
Size Distributions ◽  
Dispersed Systems ◽  
Water Solutions ◽  
Water Based

In this paper, experiments with water-based solutions of some organic compounds, which demonstrate non-Ostwald behavior have been described. Small-volume droplets demonstrate higher stability during evaporation and crystallization in comparison with larger ones, such an effect has been previously described only for water-based solutions of inorganic salts. It has been shown that non-Ostwald behavior has the same thermodynamic nature with Ostwald ripening and could occur in dispersed systems of a complicated chemical composition. Peculiar realization of such phenomena driven by surface activity of organic compounds in water solutions has also been described. The studied regularities could be used to obtain solutions of organic and bioorganic substances with concentrations significantly higher than their solubility limits under normal conditions as well as to reproduce narrow size distributions of droplets in various spray technologies.

The Tempo and mode(S) of Prebiotic Evolution

1997 ◽  
Vol 161 ◽  
pp. 419-429 ◽  
Author(s):  
Antonio Lazcano
Keyword(s):  
Origin Of Life ◽  
Organic Compounds ◽  
Biological Evolution ◽  
Current Evidence ◽  
Early Diversification ◽  
Time Period ◽  
The Galaxy ◽  
History Of ◽  
Widespread Phenomenon ◽  
The Origin Of Life

AbstractDifferent current ideas on the origin of life are critically examined. Comparison of the now fashionable FeS/H2S pyrite-based autotrophic theory of the origin of life with the heterotrophic viewpoint suggest that the later is still the most fertile explanation for the emergence of life. However, the theory of chemical evolution and heterotrophic origins of life requires major updating, which should include the abandonment of the idea that the appearance of life was a slow process involving billions of years. Stability of organic compounds and the genetics of bacteria suggest that the origin and early diversification of life took place in a time period of the order of 10 million years. Current evidence suggest that the abiotic synthesis of organic compounds may be a widespread phenomenon in the Galaxy and may have a deterministic nature. However, the history of the biosphere does not exhibits any obvious trend towards greater complexity or «higher» forms of life. Therefore, the role of contingency in biological evolution should not be understimated in the discussions of the possibilities of life in the Universe.

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