Structure and nanostructure in ionic liquids.

On the dynamics and structure of charge-stabilized suspensions

The phase behavior and aggregate morphology of mixtures of the oppositely charged surfactants cetyltrimethylammonium bromide (CTAB) and sodium octyl sulfate (SOS) are explored with cryotransmission electron microscopy, quasielastic light scattering, and surface tensiometry. Differences in the lengths of the two hydrophobic chains stabilize vesicles relative to other microstructures (e.g., liquid crystalline and precipitate phases), and vesicles form spontaneously over a wide range of compositions in both CTAB-rich and SOS-rich solutions. Bilayer properties of the vesicles depend on the ratio of CTAB to SOS, with CTAB-rich bilayers stiffer than SOS-rich ones. We observe two modes of microstructural transition between micelles and vesicles. The first transition, between rodlike micelles and vesicles, is first order, and so there is macroscopic phase separation. This transition occurs in CTAB-rich solutions and in SOS-rich solutions at higher surfactant concentrations. In the second transition mode, mixtures...

Phase Behavior of Aqueous Mixtures of Cetyltrimethylammonium Bromide (CTAB) and Sodium Octyl Sulfate (SOS)

A. Temperature Chambers 1735 B. Pressure Cells 1735 C. Stretching Equipment 1736 D. Fiber Spinning Equipment 1737 E. Fiber Drawing Apparatus 1738 F. Shear Apparatus 1739 IV. Combined Techniques 1739 A. Simultaneous SAXS/WAXD 1739 B. Raman Spectroscopy 1740 C. Laser Light Scattering 1741 D. Fourier Transform IR Spectroscopy 1743 V. Applications 1743 A. Materials-Based Studies 1743 1. Block Copolymers 1743 2. Ionomers 1745 3. Liquid Crystalline Polymers 1745 4. Biopolymers 1746 B. Phenomenon-Based Studies 1747 1. Polymer Solutions and Gels 1747 2. Colloidal Suspensions, Micellar Solutions, and Microemulsions 1749

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Small-angle X-ray scattering of polymers.

Microemulsions — phase equilibria characterization, structures, applications and chemical reactions

to the physics of complex "fluids".- Some aspects of the statistical mechanics of concentrated colloidal suspensions.- The structure and dynamics of strongly interacting charged colloidal liquids.- Disorder-to-order phase transitions in concentrated colloidal dispersions.- Polymer dynamics.- Video microscopy of charge-stabilized colloidal suspensions.- Structure and thermodynamics of charged colloids.- A study of polymer-colloid interaction by light scattering.- Kinetics of phase transitions in two dimensional systems with competing interactions.- Interpretation of dynamical properties of polymeric cluster solutions.- On the difference between weakly structured mixtures and microemulsions.- Microemulsions: an ensemble of fluctuating interfaces.- Lattice models of amphiphilic assembly.- Low interfacial tensions in microemulsion systems.- Fluid membranes in the water/NaCl - AOT system: a study combining small-angle neutron scattering, electron microscopy and NMR self diffusion.- Shape and size fluctuation of microemulsion droplets.- Experimental and theoretical studies of critical phenomena in solutions of supramolecular aggregates: Micelles and microemulsions.- Experimental and theoretical studies of dense percolating microemulsions.- Structural relaxation in dense microemulsions.- Structural evolution and transition of a three component dense microemulsion system.- Self-assembly and self-organization in micellar liquid crystals.- Transient and static SANS and optical birefringence by alignment of micelles in a shear flow and in electric and magnetic fields.- Rheology of viscoelastic micellar solutions.- Computer simulation of micelles in aqueous solution.- Computer simulations of surfactants at a liquid/liquid interface.- Small angle neutron scattering from systems of interacting particles. Modelling high density micellar fluids.- Static and dynamic electric birefringence in model colloidal dispersions of intrinsically anisotropic particles.- Phase behavior of aqueous mixtures of anionic and cationic surfactants along a dilution path.- Composition fluctuations and phase diagrams for ternary mixtures.- Synchrotron X-ray and cold neutron studies of amphiphilic monolayer structures.- The structure of surfactant monolayers determined by the neutron reflection technique.- to small angle neutron scattering applied to colloidal science.- Theory of scattering from bicontinuous structures.- Magnetism of thin film multilayers: an analogue of interacting platelets.- High resolution small angle X-ray scattering of colloids.- Principles and applications of diffusing-wave spectroscopy.- Colloidal crystals made of anisotropic spherical particles: a quasielastic light scattering study.- Colloidal aggregation in the intermediate regimes.- Dynamic structure factor of strongly interacting charged colloids measured without multiple scattering errors.- Broad distribution of relaxation times in dense homogeneous diblock copolymers.- Interaction of colloidal particles with critical liquid mixtures.- The study of binary colloidal mixtures by neutron scattering.- Percolation phenomenon in microemulsions: the temperature effect.- Static electrical conductivity at the droplet-lamella phase transition of a water-in-oil microemulsion.- Bulk and interfacial properties of amphiphilic systems: a Ginzburg-Landau approach.- Dynamic light scattering by aqueous solutions of rod-like FD-virus particles.- On the universal nature of the nematic-to-isotropic transition in solutions of discotic micelles.- The evolution of a scattering peak in a semidilute three component microemulsion.- Effect of formamide on microemulsions.- Author index.

Piero Tartaglia

Papers

Structure and dynamics of strongly interacting colloids and supramolecular aggregates in solution