Unusual Behavior of the Aqueous Solutions of Gemini Bispyridinium Surfactants: Apparent and Partial Molar Enthalpies of the Dimethanesulfonates

2008 ◽  
Vol 112 (39) ◽  
pp. 12312-12317 ◽  
Author(s):  
Emilia Fisicaro ◽  
Carlotta Compari ◽  
Mariano Biemmi ◽  
Elenia Duce ◽  
Monica Peroni ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Unusual Behavior ◽  
Partial Molar Enthalpies

Thermodynamic properties of peptide solutions. The relative partial molar enthalpies of aqueous solutions of glycylglycylglycine, glycylglycylalanine and alanylglycylglycine

1983 ◽  
Vol 36 (9) ◽  
pp. 1813 ◽  
Author(s):  
MK Kumaran ◽  
ID Watson ◽  
GR Hedwig
Keyword(s):  
Thermodynamic Properties ◽  
Aqueous Solutions ◽  
Side Chain ◽  
Enthalpies Of Dilution ◽  
Flow Microcalorimetry ◽  
Water Side ◽  
Partial Molar Enthalpies

The enthalpies of dilution at 298 K of aqueous solutions of the tripeptides glycylglycylglycine, glycylglycylalanine and alanylglycylglycine have been determined by flow microcalorimetry. From these data the partial molar enthalpies of the solvent in the solutions have been calculated. The results indicate that water side-chain interactions make an important contribution to the solvation of peptides.

scholarly journals Excess partial molar enthalpies of alkane-mono-ols in aqueous solutions

1996 ◽  
Vol 74 (5) ◽  
pp. 713-721 ◽  
Author(s):  
Steven Hiroshi Tanaka ◽  
Hikari Infinity Yoshihara ◽  
Alice Wen-Chi Ho ◽  
Frankie W. Lau ◽  
Peter Westh ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Key Words ◽  
Mole Fraction ◽  
Composition Range ◽  
Hydrophobic Moiety ◽  
Enthalpic Interaction ◽  
Mixing Schemes ◽  
Small Increments ◽  
Partial Molar Enthalpies ◽  
Transition Of Mixing Scheme

Excess partial molar enthalpies, HAE, of methanol, ethanol, and 1- and 2-propanols in aqueous solutions were measured directly, accurately, and in small increments in mole fraction at 25 °C. From these data, the solute–solute enthalpic interactions, HAAE≡N(∂HAE/∂nA), were evaluated for each alcohol. These data indicate that three distinctively different mixing schemes, I, II, and III exist, as was the case for aqueous 2-butoxyethanol previously studied in our laboratory. The transition from mixing scheme I to II appears to take place gradually within a small composition range. As the hydrophobic moiety becomes smaller from 2-butoxyethanol to methanol, the locus of the transition moves to a higher value in mole fraction of the alcohol. At the same time, the range of transition becomes wider and the solute–solute enthalpic interaction weaker. Key words: excess partial molar enthalpies in aqueous solutions, methanol, ethanol, 1-propanol, 2-propanol, enthalpic interaction, transition of mixing scheme.

Unusual Behavior of Atactic Poly(methacrylic acid) in Aqueous Solutions Monitored by Wide-Angle Light Scattering

2004 ◽  
Vol 108 (47) ◽  
pp. 18164-18173 ◽  
Author(s):  
Ksenija Kogej ◽  
Hugo Berghmans ◽  
Harry Reynaers ◽  
Sergio Paoletti
Keyword(s):  
Light Scattering ◽  
Aqueous Solutions ◽  
Methacrylic Acid ◽  
Wide Angle ◽  
Unusual Behavior

Excess partial molar entropy of alkane-mono-ols in aqueous solutions at 25°C

2003 ◽  
Vol 81 (2) ◽  
pp. 150-155 ◽  
Author(s):  
Yoshikata Koga ◽  
Peter Westh ◽  
Keiko Nishikawa
Keyword(s):  
Aqueous Solutions ◽  
Key Words ◽  
Preceding Paper ◽  
Aqueous Methanol ◽  
Model Free ◽  
Chemical Potentials ◽  
Hydrophobic Nature ◽  
Mixing Schemes ◽  
Partial Molar Entropy ◽  
Partial Molar Enthalpies

In the preceding paper, we reported the values of model-free chemical potentials for aqueous methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, and 1-hexanol at 25°C over the entire compositional region. Using alcohol excess partial molar enthalpies, HEAL, determined earlier in this laboratory (Can. J. Chem. 74, 713 (1996)), we have calculated excess partial molar entropies for the alcohols, SEAL, where AL stands for an alcohol. We then calculated, numerically, the entropic interaction, SEAL–AL = N([Formula: see text]SEAL/[Formula: see text]nAL)p,T,nW, where nAL is the amount of AL, nW is the amount of H2O, and N is the total amount of solution. SEAL–AL signifies the effect of addition of AL upon the entropic situation of existing AL in solution. Using these quantities, the mixing schemes in aqueous alcohols have been studied. The earlier conclusions, which used HEAL and HEAL–AL alone, are confirmed. Furthermore, the order of the relative hydrophobic nature of alcohols is established from the behaviour of SEAL–AL and of HEAL–AL as methanol < ethanol < 2-propanol < 1-propanol. Key Words: aqueous alcohols, excess partial molar entropies, entropic interaction mixing schemes, hydrophobicity ranking.

Unusual behavior of transport coefficients in aqueous solutions of zinc chloride at 25.degree.C

1984 ◽  
Vol 88 (10) ◽  
pp. 2173-2178 ◽  
Author(s):  
H. Weingaertner ◽  
K. J. Mueller ◽  
H. G. Hertz ◽  
A. V. J. Edge ◽  
R. Mills
Keyword(s):  
Aqueous Solutions ◽  
Zinc Chloride ◽  
Transport Coefficients ◽  
Unusual Behavior

Apparent and partial molar enthalpies of some potassium p-n-alkyl-benzoate aqueous solutions

Polyhedron ◽  
2002 ◽  
Vol 21 (14-15) ◽  
pp. 1497-1502 ◽  
Author(s):  
Emilia Fisicaro ◽  
Carlotta Compari ◽  
Yoshikiyo Moroi
Keyword(s):  
Aqueous Solutions ◽  
Partial Molar Enthalpies

ChemInform Abstract: UNUSUAL BEHAVIOR OF TRANSPORT COEFFICIENTS IN AQUEOUS SOLUTIONS OF ZINC CHLORIDE AT 25°C

1984 ◽  
Vol 15 (32) ◽  
Author(s):  
H. WEINGAERTNER ◽  
K. J. MUELLER ◽  
H. G. HERTZ ◽  
A. V. J. EDGE ◽  
R. MILLS
Keyword(s):  
Aqueous Solutions ◽  
Zinc Chloride ◽  
Transport Coefficients ◽  
Unusual Behavior

Ultrathin frozen sections of yeast without aldehyde prefixation

1978 ◽  
Vol 36 (2) ◽  
pp. 58-59
Author(s):  
K. J. Böhm ◽  
a. E. Unger
Keyword(s):  
Aqueous Solutions ◽  
Biological Material ◽  
Yeast Cells ◽  
Frozen Sections ◽  
Good Preservation ◽  
Ultrathin Frozen Sections

During the last years it was shown that also by means of cryo-ultra-microtomy a good preservation of substructural details of biological material was possible. However the specimen generally was prefixed in these cases with aldehydes.Preparing ultrathin frozen sections of chemically non-prefixed material commonly was linked up to considerable technical and manual expense and the results were not always satisfying. Furthermore, it seems to be impossible to carry out cytochemical investigations by means of treating sections of unfixed biological material with aqueous solutions.We therefore tried to overcome these difficulties by preparing yeast cells (S. cerevisiae) in the following manner:

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