Sedimentation field-flow fractionation of polystyrene latex particles in alcohol solvent

✍ Scribed by Yasushige Mori

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 136 KB
• Volume: 10
• Category: Article
• ISSN: 1040-7685
• DOI: 10.1002/(sici)1520-667x(1998)10:1<57::aid-mcs8>3.0.co;2-y

✦ Synopsis

Most analyses of submicron particles using sedimentation field-flow Ž . fractionation SdFFF have been carried out in aqueous systems. However, a nonaqueous carrier solution could be suitable for SdFFF when the particle density is close to the density of water. Few papers have reported the retention behavior of SdFFF in nonaqueous systems. In this article, the retention ratio of particles was investigated using various kinds of alcohol solvents, such as methanol, ethanol, 1-propanol, and 2-propanol. The retention time of particles is shorter than that calculated by ordinary retention theory, and the prediction for the retention ratio needs to consider particle᎐wall interactions consisting of electrostatic and van der Waals forces in the same manner as established in the case of the aqueous carrier solution. The effects of the ionic concentration on the retention ratio are shown by the experimental results using a methanol carrier solution with Aerosol OT ionic surfactant. The retention ratio could be estimated by ordinary retention theory if methanol with a certain amount of Aerosol OT is used as a carrier solution. ᮊ 1998