scholarly journals PRESSURE-VOLUME APPROACH TO THE ACTIVITY COEFFICIENT OF NONELECTROLYTE IN AQUEOUS MIXED SOLVENT

1977 ◽  
Vol 6 (4) ◽  
pp. 321-326 ◽  
Author(s):  
Hitoshi Watarai ◽  
Nobuo Suzuki
Keyword(s):  
Activity Coefficient ◽  
Mixed Solvent

Effect of association in the vapour phase on the value of activity coefficient

1979 ◽  
Vol 44 (4) ◽  
pp. 1187-1196 ◽  
Author(s):  
Ivona Malijevská
Keyword(s):  
Activity Coefficient ◽  
Binary Systems ◽  
Vapour Phase

The relations were obtained between the thermodynamically consistent activity coefficient of associating component and the activity coefficient calculated irrespective of the association in the vapour phase. The analysis is limited to binary systems with one associating component and is given for the two cases: (a) the associating component dimerizes only, (b) the associating component forms, in addition to a dimer, one higher associate, too.

Study of Sedimentation Velocity of Block Copolymer Micelles

1993 ◽  
Vol 58 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Minmin Tian ◽  
C. Ramireddy ◽  
Stephen E. Webber ◽  
Petr Munk
Keyword(s):  
Block Copolymer ◽  
Methacrylic Acid ◽  
Mixed Solvent ◽  
Hard Spheres ◽  
Sedimentation Velocity ◽  
Hydrodynamic Coefficient ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Size Heterogeneity ◽  
Good Agreement

No anomalies were observed during the measurement of sedimentation coefficients of block copolymer micelles formed by copolymers of styrene and methacrylic acid in a mixed solvent; 80 vol.% of dioxane and 20 vol.% of water. The shapes of the sedimenting boundaries suggest that the size heterogeneity of the micelles is small. Linear relations between 1/s and c were obtained. The value of the hydrodynamic coefficient κ was between 2 and 4 in a good agreement with the value 2.75 or 2.86 that was obtained by combining Burgers' or Fixman's values of the coefficient of the concentration dependence kvs for hard spheres with Einstein's value of [η] for spheres.

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