A stack of tensionless membranes with nonlinear curvature energy and vertical harmonic interaction is studied. At low temperatures, the system forms a lamellar phase. At a critical temperature, the stack disorders vertically in a melting-like transition. PACS. 82.65.Dp Thermodynamics of surfaces and interfaces – 68.35.Rh Phase transitions and critical phenomena

PST TiAl samples of different orientations were prepared and deformed by compression at room temperature. The deformation structures on the free surfaces were scanned using an AFM. It was found that when the angle between the lamellar interfaces and the loading axis is between 20 degree and 80 degree, PST samples deform primarily by shear in slip planes parallel to the lamellar interfaces. When...

Herein the enantio-selective polymerization of diacetylene (DA) units in the discotic hydrogen-bonding complex is carried out in an asymmetric reaction field consisting of the lamellar columnar LC phase and CPUL stimulus.

Diffusion of symmetric diblock copolymer chains in macroscopically oriented lamellar block copolymers are studied in a molecular dynamics simulation. Results for diffusion constant both parallel D‖ and perpendicular D⊥ to the lamellar planes are compared to results in the disordered one phase region. For diblocks of length N = 40 (1.1Ne) and 100 (3Ne), where Ne is the entanglement length of a h...

We investigate experimentally the linear viscoelastic properties of a lamellar liquid foam as a function of the cell size and spatial organisation. The system consists of multilamellar vesicles generated by a simple shear flow on a lyotropic lamellar phase. The vesicles can be prepared either in an amorphous or a spatially ordered state. Their size is easily tunable in the range R = 0.5–15 μm. ...

Temperature variation experiments of small angle neutron scattering ~SANS! and neutron spin echo ~NSE! were carried out in order to compare effects of temperature and pressure on a structural formation in a ternary microemulsion system composed of AOT ~Aerosol-OT; dioctyl sulfosuccinate sodium salt!, D2O, and n-decane. From SANS measurements, a phase transition from one-phase dense water-in-oil...

Effect of hydrophilicity of the confining walls on lamellar phases in oil-water-surfactant mixtures is studied in a slit geometry. In contrast to strongly hydrophilic or hydrophobic walls, which induce parallel orientation of lamel-lae, the lamellae can be oriented perpendicularly to the neutral walls when the material properties and the termodynamical state of the sample are suitably chosen. W...