Paul S. Clegg

Bijels: a new class of soft materials

Bicontinuous interfacially jammed emulsion gels (‘bijels’) were proposed in 2005 as a hypothetical new class of soft materials in which interpenetrating, continuous domains of two immiscible fluids are maintained in a rigid state, by a jammed layer of colloidal particles at their interface. Such gels should have unusual material properties relevant to catalysis and other applications. Although initially proposed on the basis of computer simulation, the existence of bijels has since been confirmed in the laboratory. However, a wide gap remains between the simulated and the experimental systems. This leaves room for continuing debate on the cause of stability in these materials; in particular, it is not known whether an attraction between the colloidal particles is essential for stability.

From incommensurate to dispersive spin-fluctuations : The high-energy inelastic spectrum in superconducting YBa2Cu3O6.5

We have investigated the spin-fluctuations at energy transfers up to

Fluid-bicontinuous gels stabilized by interfacial colloids: low and high molecular weight fluids

\ensuremath{\sim}110\phantom{\rule{0.3em}{0ex}}\mathrm{meV}

Colloidal gels assembled via a temporary interfacial scaffold.

, well above the resonance energy

Self-organization of particles with planar surface anchoring in a cholesteric liquid crystal.

(33\phantom{\rule{0.3em}{0ex}}\mathrm{meV})

Making and breaking bridges in a Pickering emulsion

in the

Inversion of particle-stabilized emulsions of partially miscible liquids by mild drying of modified silica particles

\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6.5}

Size limit for particle-stabilized emulsion droplets under gravity.

ortho-II superconductor using neutron time-of-flight and triple-axis techniques. The spectrum at high energies differs from the low-energy incommensurate modulations previously reported where the incommensurate wave vector is largely independent of energy. Well above the resonance the peak of the spin response lies at wave vectors that increase with energy. Within error the excitations at all energies above the resonance are best described by a ring around the

Colloidal templating at a cholesteric-oil interface: assembly guided by an array of disclination lines.

(\ensuremath{\pi},\ensuremath{\pi})

A multipurpose modular system for high-resolution microscopy at high hydrostatic pressure.

position. The isotropic wave-vector pattern differs from a recently reported square pattern in different but related systems. The spin spectral weight at high energies is similar to that in the insulator but the characteristic velocity is