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Featured researches published by R. Hirte.


Colloids and Surfaces A: Physicochemical and Engineering Aspects | 1995

Novel results on the adsorption of ionic surfactants at the air/water interface — sodium-n-alkyl sulphates

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

Another approach to a surface equation of state

Klaus Lunkenheimer; R. Hirte


Langmuir | 2003

Adsorption properties of soluble, surface-chemically pure n-alkanoic acids at the air/water interface and the relationship to insoluble monolayer and crystal structure properties

Klaus Lunkenheimer; Wanda Barzyk; R. Hirte; R. Rudert


Langmuir | 1999

Novel results on the adsorption properties of n-alkyldimethylphosphine oxides at the air/water interface.

Klaus Lunkenheimer; K. Haage; R. Hirte


The Journal of Physical Chemistry | 1996

Surface equation of state and transitional behavior of adsorption layers of soluble amphiphiles at fluid interfaces

R. Hirte; Klaus Lunkenheimer


Langmuir | 1991

Effects of stereochemistry and alternation on the adsorption properties of surface-active cis- and trans-2-n-alkyl-5-hydroxy-1,3-dioxanes

Klaus Lunkenheimer; Bogdan Burczyk; Andrzej Piasecki; R. Hirte


The Journal of Physical Chemistry | 1996

Transitional behaviour in adsorbed layers of n-decanoic acid at the air/water interface

J. C. Earnshaw; C. P. Nugent; Klaus Lunkenheimer; R. Hirte


Organometallics | 1998

Zwitterionic (ammoniomethyl)tetrafluorosilicates of the formula types F4SiCH2NH2(CH2)(n)Me (n = 5-11) and F4SiCH2NMe2(CH2)(5)Me: A new class of highly efficient surface-active compounds.

Reinhold Tacke; Brigitte Pfrommer; Klaus Lunkenheimer; R. Hirte


Progress in colloid and polymer science | 1994

Novel results on adsorption properties of definite n-alkyl oxypropylene oligomers at the air/water interface

Klaus Lunkenheimer; H. R. Holzbauer; R. Hirte


Langmuir | 2015

Adsorption Properties of Surface Chemically Pure Sodium Perfluoro-n-alkanoates at the Air/Water Interface: Counterion Effects within Homologous Series of 1:1 Ionic Surfactants

Klaus Lunkenheimer; Dietrich Prescher; R. Hirte; Katrina Geggel

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Andrzej Piasecki

Wrocław University of Technology

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Bogdan Burczyk

Wrocław University of Technology

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Wanda Barzyk

Polish Academy of Sciences

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Reinhold Tacke

Forschungszentrum Jülich

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Dietrich Prescher

Polish Academy of Sciences

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