scholarly journals Solvent composition regulates the Se: Sb ratio in antimony selenide nanowires deposited from thiol–amine solvent mixtures

2022 ◽  
Author(s):  
Anchal Vashishtha ◽  
Omer Vana ◽  
Eran Edri
Keyword(s):  
Crystal Structure ◽  
Power Conversion ◽  
Solvent Composition ◽  
Solvent Mixtures ◽  
Antimony Selenide

Antimony selenide (Sb2Se3), a V2VI3 semiconductor with an intriguing crystal structure, has demonstrated improved power conversion and solar-to-hydrogen efficiencies in recent years. Depositing antimony selenide nanowires (NWs) from a solution...

The Ionization of Picric Acid in Ethanol–Sulfolane and t-Butyl Alcohol – Sulfolane Mixtures at 30 °C

1975 ◽  
Vol 53 (11) ◽  
pp. 1651-1656 ◽  
Author(s):  
Maurizio Castagnolo ◽  
Angelo De Giglio ◽  
Angelo Dell'atti ◽  
Giuseppe Petrella
Keyword(s):  
Association Constant ◽  
Composition Range ◽  
Dissociation Constants ◽  
Picric Acid ◽  
Preferential Solvation ◽  
Butyl Alcohol ◽  
Weak Acid ◽  
Solvent Composition ◽  
Solvent Mixtures ◽  
Simple Dissociation

Dissociation constants at 30 °C of picric acid have been determined by a spectrophotometric method in ethanol–sulfolane and t-butyl alcohol – sulfolane mixtures over the entire solvent composition range. Picric acid behaves as a weak acid in all mixtures. In pure sulfolane, picric acid undergoes simple dissociation for c < 0.08 M (pKHPI = 7.6). At concentrations higher than 0.08 M more complex equilibria have been observed and interpreted assuming Pi(HPi)2− as the principal picrate species in solution. Complex behavior of dependence of association constant on solvent composition was observed; in both solvent mixtures as sociation of picric acid decreases with decrease of dielectric constant. This behavior was discussed in terms of preferential solvation of picric acid by alcohols, the more basic components of the mixtures. A reaction mechanism of four alcohol molecules with one acid molecule accounts for the behavior observed.

Kinetic Study of the Acid Hydrolysis of Ethyl Hydrogen Succinate in Binary Solvent Mixtures

1978 ◽  
Vol 33 (12) ◽  
pp. 1479-1483 ◽  
Author(s):  
Fayez Y. Khalil ◽  
M. T. Hanna
Keyword(s):  
Organic Solvent ◽  
Free Water ◽  
Solvent Composition ◽  
Initial Increase ◽  
Binary Solvent ◽  
Specific Rate ◽  
Water Medium ◽  
Solvent Mixtures ◽  
Acetone Water ◽  
Hydrolysis Of

Abstract The specific rate constants for the acid-catalysed hydrolysis of ethyl hydrogen succinate in water and in a series of acetone-water and dioxane-water mixtures were determined at 30-45 °C. The solvent composition covered the range 0-90% by weight of the organic solvent. The rate was found to decrease to a minimum at about 80% of the organic solvent then to increase again with successive addition of the latter. In dioxane-water medium a slight initial increase in rate on the first addition of dioxane to water was observed and attributed to an increase in the number of "free" water molecules. The activation energy showed only slight dependence on solvent composition. The radius of the activated complex was calculated in the two media. The thermodynamic parameters were evaluated and discussed in terms of solvent composition. The reaction proved to be essentially an ion-dipole rather than an ion-ion interaction. A comparative discussion of the specific solvent effects of the two solvent systems under consideration is presented, based on the respective bond energies as given by the heats of mixing of the solvent components.

Chlorine isotope effects in the solvolysis of substituted 1-phenylethyl chlorides

1986 ◽  
Vol 64 (6) ◽  
pp. 1201-1205 ◽  
Author(s):  
Duncan J. McLennan ◽  
Allan R. Stein ◽  
Brian Dobson
Keyword(s):  
Transition State ◽  
Theoretical Calculations ◽  
Isotope Effects ◽  
Chloride Ion ◽  
Solvent Composition ◽  
Solvent Mixtures ◽  
Chlorine Isotope ◽  
Water Solvent ◽  
Alcohol Water ◽  
Substituted 1

Kinetic chlorine isotope effects attending the solvolysis of several ring-substituted 1-phenylethyl chlorides in alcohol–water solvent mixtures are reported. The k35/k37 values are insensitive to the identity of ring substituents and to solvent composition. Results are interpreted in terms of an SN1 heterolytic process incorporating a significant amount of internal return. Theoretical calculations suggest that the incipient chloride ion in the transition state may be strongly hydrogen-bonded.

scholarly journals Fabrication of Highly Efficient Pervoskite Solar Cells Using Simple Single-step Solution Method

2021 ◽  
Vol 37 (2) ◽  
Author(s):  
Quang-Duy Dao
Keyword(s):  
Crystal Structure ◽  
Solution Method ◽  
Power Conversion ◽  
Photovoltaic Performance ◽  
Forward Bias ◽  
Perovskite Solar Cell ◽  
Single Step ◽  
High Crystallization ◽  
High Absorption Coefficient ◽  
High Absorption

This article presents optical property, crystal structure, and photovoltaic performance of perovskite solar cell (PSC) in n-i-p structure using simple single-step solution method with anti-solvent drip. The fabricated PSC exhibited a relatively high photovoltaic performance with the best power conversion efficiency of 15.8% under forward bias scan. The relatively high photovoltaic performance was probably resulted from the high crystallization, the high absorption coefficient, and the crack-like void-free on the surface of the perovskite absorbers.

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