@article{gangwal_cayre_velev_2008, title={Dielectrophoretic Assembly of Metallodielectric Janus Particles in AC Electric Fields}, volume={24}, ISSN={["0743-7463"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-62249218852&partnerID=MN8TOARS}, DOI={10.1021/la8015222}, abstractNote={"Janus" particles with two hemispheres of different polarizability or charge demonstrate a multitude of interesting effects in external electric fields. We reported earlier how particles with one metallic hemisphere and one dielectric hemisphere self-propel in low-frequency alternating current (AC) electric fields. Here, we demonstrate the assembly of such Janus particles driven by AC electric fields at frequencies above 10 kHz. We investigated the relation between field-induced dielectrophoretic force, field distribution, and structure of the assemblies. The phase space for electric field intensity and frequency was explored for particle concentrations large enough to form a monolayer on a glass surface between two gold electrodes. A rich variety of metallodielectric particle structures and dynamics were uncovered, which are very different from those obtained from directed assembly of plain dielectric or plain conductive particles under the action of fields of similar frequency and intensity. The metallodielectric particles assemble into new types of chain structures, where the metallized halves of neighboring particles align into lanes along the direction of the electric field, while the dielectric halves face in alternating direction. The staggered chains may assemble in various orientations to form different types of two-dimensional metallodielectric crystals. The experimental results on the formation of staggered chains are interpreted by means of numerical simulations of the electric energy of the system. The assembly of Janus metallodielectric particles may find applications in liquid-borne microcircuits and materials with directional electric and heat transfer.}, number={23}, journal={LANGMUIR}, author={Gangwal, Sumit and Cayre, Olivier J. and Velev, Orlin D.}, year={2008}, month={Dec}, pages={13312–13320} }
 @article{gangwal_cayre_bazant_velev_2008, title={Induced-charge electrophoresis of metallodielectric particles}, volume={1}, number={5}, journal={Physical Review Letters}, author={Gangwal, S. and Cayre, O. J. and Bazant, M. Z. and Velev, O. D.}, year={2008} }
 @article{courbaron_cayre_paunov_2007, title={A novel gel deformation technique for fabrication of ellipsoidal and discoidal polymeric microparticles}, number={6}, journal={Chemical Communications (Cambridge, England)}, author={Courbaron, A. C. and Cayre, O. J. and Paunov, V. N.}, year={2007}, pages={628–630} }
 @article{paunov_cayre_noble_stoyanov_velikov_golding_2007, title={Emulsions stabilised by food colloid particles: Role of particle adsorption and wettability at the liquid interface}, volume={312}, ISSN={["0021-9797"]}, DOI={10.1016/j.jcis.2007.03.031}, abstractNote={We study the effect of the particle wettability on the preferred type of emulsion stabilised solely by food colloid particles. We present results obtained with the recently developed gel trapping technique (GTT) for characterisation of wettability and surface structuring of individual food colloid particles adsorbed at air–water and oil–water interfaces. This method allows us to replicate a particle monolayer onto the surface of polydimethylsiloxane (PDMS) without altering the position of the particles. By observing the polymer surface with scanning electron microscopy (SEM), we are able to determine the contact angle of the individual particles at the initial liquid interface. We demonstrate that the GTT can be applied to fat crystal particles, calcium carbonate particles coated with stearic acid and spray-dried soy protein/calcium phosphate particles at air–water and oil–water interfaces. Subsequently, we prepare emulsions of decane and water stabilised by the same food colloid particles and correlate the wettability data obtained for these particles to the preferred type of emulsions they stabilise.}, number={2}, journal={JOURNAL OF COLLOID AND INTERFACE SCIENCE}, author={Paunov, Vesselin N. and Cayre, Olivier J. and Noble, Paul F. and Stoyanov, Simeon D. and Velikov, Krassimir P. and Golding, Matt}, year={2007}, month={Aug}, pages={381–389} }
 @article{cayre_chang_velev_2007, title={Polyelectrolyte diode: Nonlinear current response of a junction between aqueous ionic gels}, volume={129}, ISSN={["1520-5126"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-35948967966&partnerID=MN8TOARS}, DOI={10.1021/ja072449z}, abstractNote={We demonstrate that a fixed junction between two aqueous gels containing oppositely charged polyelectrolytes could rectify electric current. The agarose-based gels were "doped" with sodium poly(styrene sulfonic acid) and poly(diallyl dimethylammonium chloride). The unidirectional current response of the interface between the cationic and anionic gels originates directly from anisotropy in the mobile ionic charges in the gels. The current depends on the concentration of polyelectrolyte, the background ionic concentration, and the distance traveled by the ions. The I-V curves from the devices demonstrated a combination of transient and stationary rectification effects. The current densities achieved were comparable to or higher than those obtained with previously reported organic semiconductor diodes. The diodes had good long-term stability in both DC and AC conduction modes. The materials and the process of preparation of these devices are simple, inexpensive, and scalable. They could be used in flexible and biocompatible electronic circuits.}, number={35}, journal={JOURNAL OF THE AMERICAN CHEMICAL SOCIETY}, author={Cayre, Olivier J. and Chang, Suk Tai and Velev, Orlin D.}, year={2007}, month={Sep}, pages={10801–10806} }