Study on Enthalpy and Molar Heat Capacity of Solution for the Ionic Liquid [C2mim][OAc] (1-Ethyl-3-methylimidazolium acetate)

2012 ◽  
Vol 57 (11) ◽  
pp. 3171-3175 ◽  
Author(s):  
Xiao-Xue Ma ◽  
Long Li ◽  
Jie Wei ◽  
Wen-Bin Duan ◽  
Wei Guan ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Ionic Liquid ◽  
Molar Heat Capacity ◽  
Heat Capacity Of Solution

Study on enthalpy and molar heat capacity of solution for ionic liquid [C3mim][OAc](1-propyl-3-methylimidazolium acetate)

2013 ◽  
Vol 65 ◽  
pp. 91-94 ◽  
Author(s):  
Xiao-Xue Ma ◽  
Qiu-Bo Zhang ◽  
Jie Wei ◽  
Yi Pan ◽  
Wei Guan ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Ionic Liquid ◽  
Molar Heat Capacity ◽  
Heat Capacity Of Solution

Molar heat capacity of four aqueous ionic liquid mixtures

2011 ◽  
Vol 519 (1-2) ◽  
pp. 44-49 ◽  
Author(s):  
Hui-Chun Hu ◽  
Allan N. Soriano ◽  
Rhoda B. Leron ◽  
Meng-Hui Li
Keyword(s):  
Heat Capacity ◽  
Ionic Liquid ◽  
Molar Heat Capacity ◽  
Liquid Mixtures

Approximation of adsorption heats of carbon monoxide on transition metals by means of an empirical model

1983 ◽  
Vol 48 (10) ◽  
pp. 2735-2739
Author(s):  
Jiří Fusek ◽  
Oldřich Štrouf ◽  
Karel Kuchynka
Keyword(s):  
Carbon Monoxide ◽  
Heat Capacity ◽  
Transition Metals ◽  
Molar Heat Capacity ◽  
Metal Adsorption ◽  
Heat Of Fusion ◽  
Class Structure ◽  
Fundamental Parameters ◽  
Adsorption Heats ◽  
Pauling Electronegativity

The class structure of transition metals chemisorbing carbon monoxide was determined by expressing the following fundamental parameters in the form of functions: The molar heat capacity, the 1st and 2nd ionization energy, the heat of fusion, Pauling electronegativity, the electric conductivity, Debye temperature, the atomic volume of metal. Adsorption heats have been predicted for twelve transition metals.

Heat capacities and enthalpies of fusion and transformation for solvates of some salts with dimethyl sulfoxide and dimethylformamide

1988 ◽  
Vol 53 (12) ◽  
pp. 3072-3079
Author(s):  
Mojmír Skokánek ◽  
Ivo Sláma
Keyword(s):  
Heat Capacity ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Dimethyl Sulfoxide ◽  
Liquidus Temperature ◽  
Molar Heat Capacity ◽  
Solid Phase ◽  
Zinc Nitrate ◽  
Heat Capacities ◽  
Liquid Phases

Molar heat capacities and molar enthalpies of fusion of the solvates Zn(NO3)2 . 2·24 DMSO, Zn(NO3)2 . 8·11 DMSO, Zn(NO3)2 . 6 DMSO, NaNO3 . 2·85 DMSO, and AgNO3 . DMF, where DMSO is dimethyl sulfoxide and DMF is dimethylformamide, have been determined over the temperature range 240 to 400 K. Endothermic peaks found for the zinc nitrate solvates below the liquidus temperature have been ascribed to solid phase transformations. The molar enthalpies of the solid phase transformations are close to 5 kJ mol-1 for all zinc nitrate solvates investigated. The dependence of the molar heat capacity on the temperature outside the phase transformation region can be described by a linear equation for both the solid and liquid phases.

The partial molar heat capacity and volume of the peptide backbone group of proteins in aqueous solution

1998 ◽  
Vol 73 (1-2) ◽  
pp. 163-177 ◽  
Author(s):  
Marko Häckel ◽  
Gavin R. Hedwig ◽  
Hans-Jürgen Hin
Keyword(s):  
Aqueous Solution ◽  
Heat Capacity ◽  
Molar Heat Capacity ◽  
Partial Molar Heat Capacity ◽  
Peptide Backbone

Capacité calorifique de polyélectrolytes en solution

1985 ◽  
Vol 63 (7) ◽  
pp. 1568-1571 ◽  
Author(s):  
Hubert Daoust ◽  
Hoa Le Thanh ◽  
Pierre Ferland ◽  
Daniel St-Cyr
Keyword(s):  
Heat Capacity ◽  
Sodium Salt ◽  
Polyacrylic Acid ◽  
Molar Heat Capacity ◽  
Conformational Transformation ◽  
Polymethacrylic Acid ◽  
High Dilution ◽  
Constant Concentration ◽  
Apparent Molar Heat Capacity ◽  
Low Concentrations

Heat capacities of polyelectrolytes in aqueous solutions have been measured at 25 °C using a Picker-type dynamic micro-calorimeter. The precision of the apparatus is such that it is possible to calculate the apparent molar heat capacity [Formula: see text] of the solute, even at high dilution. The polymers that were studied include polymethacrylic acid (PMAH) and polyacrylic acid (PAH), as well as its sodium salt and the sodium salt of the polystyrènesulfonate. For the salts, the results show that the value of [Formula: see text] decreases rapidly with dilution to low concentrations; this result is in perfect concordance with a relation derived from the theory of Lifson and Katchalsky. A study of the variation of [Formula: see text] at a constant concentration, with the extent of the neutralization of the acids PMAH and PAH has also been conducted. As has been shown previously, the chain of the PMAH undergoes a conformational transformation when the level of neutralization gets close to 25%. This transformation implies an increase of the value of [Formula: see text] [Journal translation]

scholarly journals Generality of Correlation between Yield and Reduced Mass of Raw Materials in Organic Reactions

2021 ◽  
Author(s):  
Masatoshi Kawashima
Keyword(s):  
Molecular Weight ◽  
Heat Capacity ◽  
Molar Heat Capacity ◽  
Raw Materials ◽  
Order Approximation ◽  
Product Yield ◽  
Rotatable Bond ◽  
Carbon Chains ◽  
Synthetic Reactions ◽  
Aliphatic Carbon

To validate a generality of the correlation between product yield and reduced mass of raw materials, the regression analysis of 129 reaction examples (55 as a sample size) including at least 66 types of reactions used in syntheses of natural products such as peptides and terpenes was conducted. It was possible to predict a yield of a variety of synthetic reactions for a synthesis of natural product with many aliphatic carbon chains by applying a reduced mass, adjusted with a molecular weight and the number of rotatable bond, to the regression equation. Moreover, it was found that the increase in yield due to a use of the adjusted reduced mass correlated with the harmonic mean of the molar heat capacity of raw materials and was expressed as a second-order approximation within the analysis range.<br>

scholarly journals Generality of Correlation between Yield and Reduced Mass of Raw Materials in Organic Reactions

2021 ◽  
Author(s):  
Masatoshi Kawashima
Keyword(s):  
Molecular Weight ◽  
Heat Capacity ◽  
Molar Heat Capacity ◽  
Raw Materials ◽  
Order Approximation ◽  
Product Yield ◽  
Rotatable Bond ◽  
Carbon Chains ◽  
Synthetic Reactions ◽  
Aliphatic Carbon

To validate a generality of the correlation between product yield and reduced mass of raw materials, the regression analysis of 129 reaction examples (55 as a sample size) including at least 66 types of reactions used in syntheses of natural products such as peptides and terpenes was conducted. It was possible to predict a yield of a variety of synthetic reactions for a synthesis of natural product with many aliphatic carbon chains by applying a reduced mass, adjusted with a molecular weight and the number of rotatable bond, to the regression equation. Moreover, it was found that the increase in yield due to a use of the adjusted reduced mass correlated with the harmonic mean of the molar heat capacity of raw materials and was expressed as a second-order approximation within the analysis range.<br>

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