Effects of Solvent Composition on Polymer Retention in Thermal Field-Flow Fractionation: Retention Enhancement in Binary Solvent Mixtures

1994 ◽  
Vol 66 (22) ◽  
pp. 4043-4053 ◽  
Author(s):  
Richard M. Sisson ◽  
J. Calvin. Giddings
Keyword(s):  
Thermal Field ◽  
Solvent Composition ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Field Flow Fractionation ◽  
Binary Solvent Mixtures ◽  
Flow Fractionation ◽  
Polymer Retention

Conductance and viscosity measurements of some electrolytes in binary solvent mixtures of dimethylsulphoxide and dioxane at 25 °C

1991 ◽  
Vol 56 (9) ◽  
pp. 1813-1832 ◽  
Author(s):  
Vijay K. Syal ◽  
Puspha Bisht ◽  
Prakash C. Ranowt
Keyword(s):  
Preferential Solvation ◽  
Viscosity Coefficient ◽  
Solvent Composition ◽  
Binary Solvent ◽  
Viscosity Data ◽  
Solvent Mixtures ◽  
Ionic Conductance ◽  
Binary Solvent Mixtures ◽  
Viscosity Measurements ◽  
Solvation Of Ions

The conductance and viscosity measurements of Bu4NBPh4, Bu4NI, NaBPh4, Pr4NI, Et4NI, Me4NI, Bu4NNO3, KI, KClO4, NaClO4, KNO3, AgNO3, LiNO3 and NaBr have been carried out in the concentration range of (0-100) . 10-4 mol dm-3 for conductance and (0-250) . 10-4 mol dm-3 for viscosity in dimethylsulphoxide (DMSO) and DMSO + dioxane mixtures at 25°C. The conductance and viscosity data have been analysed by the Shedlovsky and Jones-Dole equations, respectively. The limiting ionic conductance (λi0), solvated radii (ri) and the ionic viscosity coefficient (B±) values have been evaluated. The variation of ri and B± value as a function of solvent composition has been interpreted in terms of preferential solvation of ions in these solvent mixtures.

Micro-Thermal Field-Flow Fractionation

2002 ◽  
Vol 67 (11) ◽  
pp. 1596-1608 ◽  
Author(s):  
Josef Janča
Keyword(s):  
High Performance ◽  
Thermal Field ◽  
Temperature Drop ◽  
Point Of View ◽  
Constant Field ◽  
Field Flow Fractionation ◽  
Operational Mode ◽  
Experimental Conditions ◽  
Standard Size ◽  
Flow Fractionation

The effect of miniaturization of the separation channel on the performance of thermal field-flow fractionation (TFFF) is substantiated theoretically. The experiments carried out under carefully chosen experimental conditions proved the high performance of the separation of polymers within an extended range of molar masses from relatively low up to ultrahigh-molar-mass (UHMM) samples. The new micro-TFFF allows to achieve high resolution when applying constant field force operation, it makes easy the programming of the temperature drop which is an advantageous operational mode from the point of view of the time of analysis, and it extends considerably the range of perfectly controlled temperature of the cold wall due to a substantial decrease in the heat energy flux compared with standard size channels.

Sign in / Sign up

Export Citation Format

Share Document