Application of thermal field-flow fractionation for characterization of industrial polymers

Lee, Seungho

doi:10.1002/(sici)1520-667x(1997)9:4<281::aid-mcs5>3.0.co;2-y

Cited by 13 publications

References 20 publications

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Thermal Field‐Flow Fractionation of Colloidal Suspensions

Eslahian

Maskos

2015

Encyclopedia of Analytical Chemistry

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Thermal field‐flow fractionation (ThFFF) is a powerful method for analytical and semi‐preparative particle separations according to colloidal properties. State of the art in terms of experiment and theory are reviewed. Surfactant‐free ThFFF is introduced, allowing for determination of method‐independent Soret coefficients, whereas significant electrostatic and van der Waals interactions in the channel have to be accounted. In these conditions, superior sensitivity of ThFFF on particle surface properties is demonstrated, as well as crucial dependence of fractionation of the ionic strength of the carrier. Electrostatic submechanisms to thermophoresis of charged colloids are discussed. Specific salt‐dependent fractionation is investigated in solutions mixed from NaCl and NaOH. Simulations are in good agreement with experimental data, and observed sign inversion of thermophoresis is shown to arise from thermoelectric effects. Also, temperature dependence of model colloids is simulated to be governed by electrostatic forces.

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Thermal Field‐Flow Fractionation of Colloidal Suspensions

Eslahian

Maskos

2015

Encyclopedia of Analytical Chemistry

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Determination of calibration function in thermal field flow fractionation under thermal field programming

Pasti

Ventosa

Mingozzi³

et al. 2006

J of Separation Science

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A new procedure for determining the calibration function able to relate retention and operative parameters to molecular weight of the species in thermal field flow (ThFFF) under thermal field programming (TFP) conditions is presented. The procedure involves determining the average values of retention parameters under TFP and determining a numerical function related to the temperature variations that occur during TFP. The calibration parameters are obtained by a procedure fitting the retention and operative parameters that hold true at the beginning of the TFP. The procedure is closely related to the one previously developed to calibrate the retention time axis under TFP ThFFF and, together, they constitute a full calibration procedure. Experimental validation was performed with reference to polystyrene (PS)-decalin and PS-THF systems. The calibration functions here obtained were compared to those derived by the classical procedure at constant thermal field ThFFF to obtain the calibration function at variable cold wall temperatures. Excellent agreement was found in all cases proving "universality" of the ThFFF calibration concept, i.e. it is independent of the particular system on which it was determined and can thus be extended to ThFFF operating under TFP. The new procedure is simpler than the classical one since it requires less precision in setting the instrumentation and can be obtained with fewer experiments. The potential applications for the method are discussed.

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