Inverse size-exclusion chromatography

which was introduced by Halasz and Martin in 1978 [119], represents a simple and fast method for the determination of the pore volnme, the pore size distribution profile, and the spe-cihc snrface area of porous solids. Generally, ISEC is based on the principle of SEC. SEC, also referred to as gel permeation or gel filtration chromatography, is a noninteractive chromatographic method that separates analytes according to their size by employing a stationary phase that exhibits a well-dehned pore distribution. [Pg.25]

As per dehnition, ISEC represents the inverse approach. Well-defined (monodisperse) polymer standards (e.g., PS standards) are employed for the determination of the porosity of a stationary phase, whereas principles, apparatus, and measnrement method in ISEC are equal to that of HPLC. [Pg.25]

In order to enable the calculation of relevant porosity parameters, a number of assumptions have to be dehned [Pg.25]

The elntion volnme (Vj.) of a solnte—for a given porons structure of the stationary phase— is a fnnction of the molecular size. [Pg.25]

The solute does not adsorb at the snrface of the snpport material. [Pg.25]

Goto, M McCoy, BJ, Inverse Size-Exclusion Chromatography for Distributed Pore and Solute Sizes, Chemical Engineering Science 55, 723, 2000. [Pg.612]

A second project [10] was based on the production of Pd nanocluster inside poly-methacrylic acid (8%mol)-A,iV-di-methylacrylamide (88 % mol)-A, A -methylenebisacrylamide (4% mol). ISEC (Inverse Size Exclusion Chromatography) analysis of the resin in water in terms of cylindrical pores [7]... [Pg.414]

Al-Bokari, M., Cherrak, D., Guiochon, G. (2002). Determination of the porosities of monolithic columns by inverse size-exclusion chromatography. J. Chromatogr. A 975, 275-284. [Pg.171]

Eor means of determination and quantification of the material porosity, different methods like mercury intrusion porosity, nitrogen gas adsorption, or inverse-size exclusion chromatography (ISEC) have been established and are nowadays routinely employed for that purpose. As an alternative to these well-known methods, a new approach based on near-infrared spectroscopy (NIR) for the characterization of monoliths is introduced in this chapter. [Pg.22]

The major problem in inversed size-exclusion chromatography is the arbitrary judgment that a pore must be much larger, in order to allow a polymeric coil to enter it. On the other hand, large and flexible cods of polystyrene have been reported to penetrate into narrower pores, due to the change of their spherical conformation and reptation-type movements... [Pg.254]

The pore size and distribution are defined by nitrogen adsorption (BET) or mercury porosimetry. In chromatographic terms, inverse size-exclusion chromatography (SEC) is particularly suitable, because only those pores are measured that are chromatographically available. [Pg.249]

Figure 5.4 Inverse size-exclusion chromatography from two different poiystyrene phases. Source J. Maier-Rosenkranz, PhD thesis, Tubingen, 1992.

Journal of Applied Polymer Science 61, No.8, 22nd Aug.1996, p.1325-31 DIRECT DETERMINATION OF THE RESIDUAL ACRYLAMIDE CONCENTRATION IN INVERSE (WATER-IN-OIL) POLYACRYLAMIDE EMULSIONS FOLLOWING PHASE INVERSION SIZE EXCLUSION CHROMATOGRAPHY USING A MICELLAR MOBILE PHASE Hemandez-Barajas J Hunkeler D J Petro M Vanderbilt University... [Pg.125]

Lubda, D., Lindner, W Quaglia, M., du Fresne von Hohenesche, C., Unger, K K., 2005. Comprehensive pore stmcture characterization of silica monohths with controlled mesopore size and macropore size by nitrogen sorption, mercury porosimetry, transmission electron microscopy and inverse size exclusion chromatography. J. Chromatography A 1083 14-22. [Pg.225]

The volume fractions of both micropores (Sp) and voids (inter-microglobule porosity, e ) represent the total porosity (8t). This value indicates a percentage of pores in the monolith. The pore size distribution can be calculated from inverse size exclusion chromatography (ISEC) data or from mercury intrusion. " Together, these two values translate into a total pore volume Vp, expressed in mlg". ... [Pg.616]

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