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Digitale Medien

Retention of catechols in capillary electrophoresis with micellar and mixed micellar solutions (1989)

Wallingford, Ross A. ; Curry, Paul D. ; Ewing, Andrew G.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Microcolumn Separations 1 (1989), S. 23-27

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Details

ISSN: 1040-7685

Schlagwort(e): capillary ; electrophoresis ; micelles ; mixed micelles ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Zone electrophoresis in capillaries filled with micellar and mixed micellar solutions was examined for the separation of borate-complexed catechols. The mechanism for solute velocity was shown to involve both retention by hydrophobic interaction with the micelles and electrophoretic mobility. Mixed micellar systems involving SDS and SOS surfactants were shown to allow greater selectivity and increased separation efficiency.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mcs.1220010107

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Digitale Medien

Cross sections and spin polarizations of electrons elastically scattered from oriented molecules (CH3I) (1989)

Fink, M. ; Ross, A. W. ; Fink, R. J.

Springer

The European physical journal 11 (1989), S. 231-238

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Details

ISSN: 1434-6079

Schlagwort(e): 34.80 ; 35.80

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Elastic differential cross sections and spin polarizations for electrons elastically scattered from CH3I are calculated using the independent atom model. Three molecular orientations with respect to the incident electron wavevector are considered — first, the molecule is oriented randomly, second, the electron wave front and molecular bond are parallel, and third, the wavefront and the bond axis are perpendicular. It will be seen to what extent orientational averaging weakens features of the cross section and spin polarization. The calculations show that cross section and spin polarization measurements are a possible tool for determining the degree of molecular orientation. There is no degeneracy betweenI–C andC–I in cross section and spin polarization measurements. The results presented here for 200 eV and 600 eV electrons scattered by CH3I should be considered as a case study and it should be possible to find molecules and electron energies for which even more dramatic differences between the various orientations between the molecules and the electrons can be expected.