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  • 1.
    Herslöf-Björling, Å.
    et al.
    Physical Pharmaceutical Chemistry, Uppsala University, Biomedical Center, Uppsala, Sweden; Medical Products Agency, Uppsala, Sweden.
    Björling, Mikael
    Physical Chemistry, Department of Chemistry, Royal Institute of Technology, Stockholm, Sweden.
    Sundelöf, L.-O.
    Physical Pharmaceutical Chemistry, Uppsala University, Biomedical Center, Uppsala, Sweden.
    The Counter- and Colon Influence on the Interaction between Sodium Hyaluronate and Tetradecyltrimethylammonium Bromide1999In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 15, no 2, p. 353-357Article in journal (Refereed)
    Abstract [en]

    The minimum concentration of salt (critical electrolyte concentration, CEC) required to suppress precipitation/coacervation in an aqueous solution of sodium hyaluronate (NaHy) and tetradecyltrimethylammonium bromide (TTAB) has been studied and CEC diagrams constructed for a set of inorganic salts, as a function of TTAB concentration. An initial rapid increase in the CEC is observed for low TTAB concentrations at the onset of the coacervation region. When the TTAB concentration is increased, a CEC plateau is reached at a certain TTAB concentration. Thereafter, the CEC value stays fairly constant, independent of TTAB concentration, until finally the CEC value starts to decrease at a sufficiently high TTAB concentration. The CEC plateau value and the onset of the decrease of CEC are shown to depend strongly on the valence of the ions constituting the salt. For ions of equal valency, ion-specific effects are observed.

  • 2.
    Lisiecki, I.
    et al.
    Laboratoire SRSI, Universite Pierre et Marie Curie, Paris, France; CEN Saclay, DRECAM-SCM Bat 522, Gifsur Yvette, France; Depagrtment of Applied Mathematics, Canberra, Australia; Universite Pierre et Marie Curie, France; CEN Saclay, France.
    Bjorling, Mikael
    Laboratoire SRSI, Universite Pierre et Marie Curie, Paris, France; CEN Saclay, DRECAM-SCM Bat 522, Gifsur Yvette, France; Depagrtment of Applied Mathematics, Canberra, Australia; Universite Pierre et Marie Curie, France; CEN Saclay, France.
    Motte, L.
    Laboratoire SRSI, Universite Pierre et Marie Curie, Paris, France; CEN Saclay, DRECAM-SCM Bat 522, Gifsur Yvette, France; Depagrtment of Applied Mathematics, Canberra, Australia; Universite Pierre et Marie Curie, France; CEN Saclay, France.
    Ninham, B.
    Laboratoire SRSI, Universite Pierre et Marie Curie, Paris, France; CEN Saclay, DRECAM-SCM Bat 522, Gifsur Yvette, France; Depagrtment of Applied Mathematics, Canberra, Australia.
    Pileni, M. P.
    Laboratoire SRSI, Universite Pierre et Marie Curie, Paris, France; CEN Saclay, DRECAM-SCM Bat 522, Gifsur Yvette, France; Depagrtment of Applied Mathematics, Canberra, Australia; Universite Pierre et Marie Curie, France; CEN Saclay, France; Department of Applied Mathematics, France.
    Synthesis of Copper Nanosize Particles in Anionic Reverse Micelles: Effect of the Addition of a Cationic Surfactant on the Size of the Crystallites1995In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 11, no 7, p. 2385-2392Article in journal (Refereed)
    Abstract [en]

    The size of copper nanoparticles in reverse micelles can be controlled by varying the water content of anionic reverse micelles (AOT = sodium bis(2-ethylhexyl)sulfosuccinate). In the presence of cetyltrim-ethylammonium chloride (CTAC), depending on the concentration, the size of the particles is strongly affected. At a low CTAC concentration ([CTAC] = 4 × 10-4 M), an unexpectedly large increase in the size is observed. At the other extreme, a decrease in the size is observed at higher CTAC concentration ([CTAC] = 6.4 × 10-3 M). The increase in the size at low CTAC concentration could be explained in terms of the formation of superaggregates containing most of the cationic surfactant. At higher CTAC concentrations, a random distribution of the positively charged surfactant takes place and the decrease in the size could be due to a decreasein the intermicellar attraction. Furthermore, the yield of particles drastically increases which is attributed to a change in the redox potential.

  • 3.
    Söderlind, E.
    et al.
    Department of Physical Chemistry, Royal Institute of Technology, Stockholm, Sweden.
    Björling, M.
    Department of Physical Chemistry, Royal Institute of Technology, Stockholm, Sweden.
    Stilbs, P.
    Department of Physical Chemistry, Royal Institute of Technology, Stockholm, Sweden.
    Molecular Mobility and Order of Didodecyldimethylammonium Chloride Adsorbed on Silica Particles from 2H Nuclear Spin Relaxation1994In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 10, no 3, p. 890-898Article in journal (Refereed)
    Abstract [en]

    Didodecyldimethylammonium chloride (DDAC) was adsorbed onto two different silicas with different particle radii at pH 10. Bulk adsorption studies for Cab-O-Sil M5 suggest that the surfactant forms a complete bilayer on the solid surface, as judged from the observed plateau adsorption level (Γ = 1.25 mmol/g) and the calculated surface density. In order to further elucidate the structure and dynamics of the adsorbed surfactant, 2H NMR studies on selectively labeled DDAC (DDAC-d6, deuterium labeled in the nitrogen bound methyls) were undertaken. Spectra and spin relaxation parameters were recorded for the surfactant adsorbed on silica, in reference to those for DDAC-d6 dispersed in water and in lamellar liquid crystals. These studies reveal that the exchange between the solid surface and solution is slow on the pertinent NMR time scale. For DDAC-d6 adsorbed on large particles a quadrupole splitting corresponding to an order parameter of SDF = 0.0156 is clearly visible. Longitudinal (T1) spin relaxation measurements at different temperatures are consistent with a higher degree of motional constraints in the adsorbed state, as compared to the dissolved state. Transverse (T2) spin relaxation measurements and the observed deuterium bandshapes point to the existence of modes of slow molecular motions. An attempt was made to characterize these slow motions further, by studying the dependence of T on the pulse dispersion in the quadrupolar CPMG (Q-CPMG) pulse sequence. The correlation time for slow molecular motions so-obtained suggests that additional modes of slow motions are more important for adsorbed DDAC-d6 than for aggregates in solution, the most likely candidate being related to motions caused by a mismatch of the preferred structure of the surfactant bilayer and the silica surface.

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