A R Tajbakhsh

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The macroscopic shape of liquid-crystalline elastomers strongly depends on the order parameter of the mesogenic groups. This order can be manipulated if photo-isomerisable groups, e.g. containing N=N bonds, are introduced into the material. We have explored the large photo-mechanical response of such an azobenzene-containing nematic elastomer at different(More)
We demonstrate, for the first time, the large electromechanical response in ne-matic liquid crystalline elastomers filled with a very low (∼ 0.01%) concentration of carbon nanotubes, aligned along the nematic director at preparation. The nan-otubes create a very large effective dielectric anisotropy of the composite. Their local field-induced torque is(More)
We carry out a detailed deuterium NMR study of local nematic ordering in polydomain nematic elastomers. This system has a close analogy to the random-anisotropy spin glass. We find that, in spite of the quadrupolar nematic symmetry in 3-dimensions requiring a first-order transition, the order parameter in the quenched " nematic glass " emerges via a(More)
Separation of 100 kilobase DNA molecules in 10 seconds " Anal. band structure of highly deformable, self-assembling systems " Phys. Scaling of thermodynamic mixing properties in solid solution minerals " Phys. " Stimulated scattering of indirect excitons in coupled quantum wells – signature of degenerate Bose-gas of excitons " Phys. Quantum phases of(More)
Cholesteric elastomers possess a macroscopic "phase chirality" as the director n rotates in a helical fashion along an optical axis z and can be described by a chiral order parameter alpha. This parameter can be tuned by changing the helix pitch p and the elastic properties of the network at formation. The cholesterics also possess a local nematic order,(More)
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