Influence of bulk and surface composition on the retention of colloidal particles in thermal field-flow fractionation

Shiundu, Paul M.; Giddings, J. Calvin

doi:10.1016/0021-9673(95)00572-5

Cited by 51 publications

(40 citation statements)

References 26 publications

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“…While before the frequently cited work by Jeon et al,40 the ionic strength dependence in ThFFF was explained by purely electrostatic phenomena,41 in the following years, it was mostly attributed to surface tension 42. Shiundu et al43 focused on the exploitation of carrier salinity in the development of ThFFF as particle separation and characterization technique.…”

Section: Theorymentioning

confidence: 99%

Ion Effects in Field‐Flow Fractionation of Aqueous Colloidal Polystyrene

Lang¹,

Eslahian²,

Maskos

2012

Macro Chemistry & Physics

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We discuss the effect of electrolytes on retention of aqueous colloidal polystyrene particles in asymmetrical flow (AF‐FFF) and thermal field‐flow fractionation (ThFFF). In both FFF subtechniques, interparticle interaction leads to non‐ideal fractionation behavior, which can result in a sample load dependency. Electrostatic repulsion is reduced with increasing electrolyte concentration, resulting in a pronounced increase of retention. At higher salinities, hydrophobic interactions dominate, thus applications of AF‐FFF under physiological conditions are limited. In ThFFF, also the separation mechanism of thermophoresis is affected by ionic shielding and experimental data are in accordance with recent theoretical models of thermophoresis.

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Section: Theorymentioning

confidence: 99%

Ion Effects in Field‐Flow Fractionation of Aqueous Colloidal Polystyrene

Lang¹,

Eslahian²,

Maskos

2012

Macro Chemistry & Physics

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“…More recently, the effect has been used to characterize mixtures of complex fluids (see, for example, Refs. [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Lattice Model for Thermodiffusion in Polymer Solutions

Luettmer-Strathmann

2005

Int J Thermophys

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Lattice Model for Thermodiffusion in Polymer Solutions 1 J. Luettmer-Strathmann 2When a temperature gradient is applied to a polymer solution, the polymer typically migrates to the colder regions of the fluid as a result of thermal diffusion (Soret effect). However, in recent thermodiffusion experiments on poly(ethylene-oxide) (PEO) in a mixed ethanol/water solvent it is observed that for some solvent compositions the polymer migrates to the cold side, while for other compositions it migrates to the warm side. In order to understand this behavior, a two-chamber lattice model for thermodiffusion in liquid mixtures and dilute polymer solutions has been developed. For mixtures of PEO, ethanol, and water, the compressibility and hydrogen bonding between PEO and water molecules are taken into account and Soret coefficients are calculated for a given temperature, pressure, and solvent composition. The sign of the Soret coefficient of PEO is found to change from negative (polymer enriched in warmer region) to positive (polymer enriched in cooler region) as the water content of the solution is increased, in agreement with experimental data. A close relationship between the solvent quality and the partitioning of the polymer between the two chambers is noted, which may explain why negative Soret coefficients for polymers are so rarely observed. The Soret effect in ethanol/water mixtures is also investigated and a change in sign of the Soret coefficient of water is found at high water concentrations, in qualitative agreement with experimental data.

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“…[4][5][6] Although the Ludwig-Soret effect of fluid mixtures has been studied for a long time since the exploring works of Ludwig and Soret, the understanding of the molecular mechanisms of the phenomena is still lacking. For complex systems such as polymer solutions and colloidal suspensions, there is no complete theory to predict the direction of the solute molecules in a temperature gradient.…”

Section: Introductionmentioning

confidence: 99%