Bjoern Lindman
Lund University
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Featured researches published by Bjoern Lindman.
Langmuir | 1994
Fredrik Tiberg; Bengt Joensson; Ji-an Tang; Bjoern Lindman
The nature of layers of a series of poly(ethy1ene glycol) monoalkyl ethers (C,,Em) adsorbed on silica surfaces has been systematically investigated by means of null ellipsometry. The results show that adsorption remains low until a well-defined concentration ((=0.6-0.9)cmc) is exceeded. Then, as surfactants in the interfacial region start to self-absemble, it increases abruptly and plateau adsorption is generally observed prior to the cmc. The normal extension of the interfacial aggregates is relatively constant from intermediate to high surface coverage. Increasing the ethylene oxide to hydrocarbon ratio results in a decreased adsorption. The mean optical thickness, on the other hand, is relatively independent of the number of ethylene oxide groups in the surfactant but almost linearly dependent on the length of the hydrocarbon tail. The values obtained for these parameters suggest that the adsorbed layer is built up of discrete surface aggregates, or micelles, with dimensions resembling those observed in bulk solution. A more refined optical model of the adsorbed layer confirms the notion of surface micelles growing with increasing hydrocarbon content. It also points out that the extension of the surface micelles is slightly larger than the measured mean optical thickness. In addition to studies of neat C S , surfactants, we also examine the adsorption of mixed surfactant systems. Changes observed in adsorption on altering the bulk ratio of two surfactants are well correlated to the bulk micellar surfactant ratio calculated by ideal solution theory.
The Journal of Physical Chemistry | 1983
Per Gunnar Nilsson; Haekan Wennerstroem; Bjoern Lindman
Journal of the American Chemical Society | 1981
Bertil Halle; Tommy Andersson; Sture Forsén; Bjoern Lindman
Langmuir | 1987
Kozo Shinoda; Bjoern Lindman
Journal of the American Chemical Society | 1979
Haakan. Wennerstroem; Bjoern Lindman; Olle. Soederman; Torbjoern. Drakenberg; Jarl B. Rosenholm
The Journal of Physical Chemistry | 1983
Per Gunnar Nilsson; Bjoern Lindman
The Journal of Physical Chemistry | 1986
Ulf Olsson; Kozo Shinoda; Bjoern Lindman
The Journal of Physical Chemistry | 1993
Eduardo F. Marques; Ali Khan; Maria G. Miguel; Bjoern Lindman
The Journal of Physical Chemistry | 1990
Gunnar Karlstroem; Anders Carlsson; Bjoern Lindman
The Journal of Physical Chemistry | 1984
Bjoern Lindman; Marie Claude Puyal; Nicole Kamenka; Roger Rymden; Peter Stilbs