R. Hirte
University of Potsdam
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Featured researches published by R. Hirte.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | 1995
Klaus Lunkenheimer; G. Czichocki; R. Hirte; Wanda Barzyk
Abstract Equilibrium surface tension vs. concentration isotherms of aqueous, surface-chemically pure solutions of the homologous series of sodium n-alkyl sulphates (from C7 to C14) have been evaluated using a new surface equation of state approach. All adsorption parameters (standard free energy of adsorption, interaction parameter, saturation adsorption) and the CMC reveal a pronounced even/odd effect. Surprisingly, it was found that the cross-sectional areas of the short-chain homologues decrease with increasing chain length, reaching a minimum value for C10 and C11. However the cross-sectional areas of the longer-chain homologues (Cn ≥ C12) increase again drastically with increasing chain length. This novel effect is attributed to increasing electrostatic repulsion within the adsorption layer caused by increasing Debye lengths of the stronger surface-active homologues. The good agreement between the data for the cross-sectional area of sodium-n-dodecyl sulphate, as obtained from the new surface equation of state approach, from the Gibbs equation and from crystal structure analysis, make us suggest that it is unreasonable to apply an additional factor in the Gibbs equation for ionic amphiphiles as long as the counterion is very small in comparison with the oppositely charged amphiphilic molecule.
The Journal of Physical Chemistry | 1992
Klaus Lunkenheimer; R. Hirte
Langmuir | 2003
Klaus Lunkenheimer; Wanda Barzyk; R. Hirte; R. Rudert
Langmuir | 1999
Klaus Lunkenheimer; K. Haage; R. Hirte
The Journal of Physical Chemistry | 1996
R. Hirte; Klaus Lunkenheimer
Langmuir | 1991
Klaus Lunkenheimer; Bogdan Burczyk; Andrzej Piasecki; R. Hirte
The Journal of Physical Chemistry | 1996
J. C. Earnshaw; C. P. Nugent; Klaus Lunkenheimer; R. Hirte
Organometallics | 1998
Reinhold Tacke; Brigitte Pfrommer; Klaus Lunkenheimer; R. Hirte
Progress in colloid and polymer science | 1994
Klaus Lunkenheimer; H. R. Holzbauer; R. Hirte
Langmuir | 2015
Klaus Lunkenheimer; Dietrich Prescher; R. Hirte; Katrina Geggel