Sun, 27 Jul 2008 08:05:30 BST CiteULike: dchen's binary http://www.citeulike.org/user/dchen/tag/binary CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2911624 <i>Soft Matter, 2006, 2, 1025 - 1042, DOI: 10.1039/b608349h</i><br /><br />This review reports on recent advances in our knowledge about the stability of binary colloids. We focus not only on experimental results but also discuss theoretical and simulation studies regarding kinetic and structural aspects of heteroaggregation processes arising in such systems. In the first part of this work, heteroaggregation of oppositely charged particles is reviewed. When the interactions are short ranged, binary diffusion-limited cluster–cluster aggregation takes place. In this case, the short time behavior of the system follows the Hogg, Healy and Fuerstenau (HHF) theory. At long times, however, stable aggregates may form and remain in the system. Furthermore, cluster discrimination is observed, i.e. clusters that differ only by one constituent particle were found to behave quite differently. When the range of the interactions is increased, the latter effects become more pronounced. The fractal dimension of heteroaggregates is, in general, smaller than the values reported for fast and slow homoaggregation processes. In some cases, even values close to unity were obtained. This means that heteroaggregates have an open branched structure that may approach a chain-like morphology. In the second part of this work, we briefly discuss similar effects arising in heteroaggregation phenomena due to differences in particle size and chemical composition. The third part of this review tackles recent developments in the field of equilibrium phase diagrams of binary colloids. In the last section, the relatively small number of papers about heteroaggregation processes in two-dimensional systems is also discussed. Stability of binary colloids: kinetic and structural aspects of heteroaggregation processes JM López-López Schmitt R Hidalgo-Álvarez Soft Matter, 2006, 2, 1025 - 1042, DOI: 10.1039/b608349h 2008-06-20T23:28:14-00:00 Soft Matter, 2006, 2, 1025 - 1042, DOI: 10.1039/b608349h 2006 aggregation binary colloids heterogeneity http://www.citeulike.org/user/dchen/article/2811049 <i>Physical Review Letters, Vol. 100, No. 18. (2008)</i><br /><br />We report fluid-fluid and fluid-solid phase transitions of charge-stabilized polystyrene particles suspended in a binary liquid mixture of 3-methylpyridine and water. These thermally reversible phase transitions occur in the homogeneous phase of the binary liquid mixture below the coexistence temperature of the two liquids. Close density matching of the particles and the solvent allows us to follow the phase behavior until complete coexistence of macroscopic phases with temperature as the control parameter. We use small angle x-ray scattering to characterize these phases as colloidal gas, liquid, fcc crystal, and glass. Reversible Phase Transition of Colloids in a Binary Liquid Solvent Hua Guo Theyencheri Narayanan Michael Sztuchi Peter Schall Gerard Wegdam doi:10.1103/PhysRevLett.100.188303 Physical Review Letters, Vol. 100, No. 18. (2008) 2008-05-18T19:08:24-00:00 2008 Physical Review Letters 100 18 APS 2008 binary charge colloids phase system http://www.citeulike.org/user/dchen/article/2735404 <i>Nature materials, Vol. 6, No. 12. (December 2007), pp. 966-971.</i><br /><br />Recent large-scale computer simulations suggest that it may be possible to create a new class of soft solids, called 'bijels', by stabilizing and arresting the bicontinuous interface in a binary liquid demixing via spinodal decomposition using particles that are neutrally wetted by both liquids. The interfacial layer of particles is expected to be semi-permeable; hence, if realized, these new materials would have many potential applications, for example, as micro-reaction media. However, the creation of bijels in the laboratory faces serious obstacles. In general, fast quench rates are necessary to bypass nucleation, so that only samples with limited thickness can be produced, which destroys the three-dimensionality of the putative bicontinuous network. Moreover, even a small degree of unequal wettability of the particles by the two liquids can lead to ill-characterized, 'lumpy' interfacial layers and therefore irreproducible material properties. Here, we report a reproducible protocol for creating three-dimensional samples of bijel in which the interfaces are stabilized by essentially a single layer of particles. We demonstrate how to tune the mean interfacial separation in these bijels, and show that mechanically, they indeed behave as soft solids. These characteristics and their tunability will be of great value for microfluidic applications. Bicontinuous emulsions stabilized solely by colloidal particles. EM Herzig KA White AB Schofield WC Poon PS Clegg doi:10.1038/nmat2055 Nature materials, Vol. 6, No. 12. (December 2007), pp. 966-971. 2008-04-29T20:39:54-00:00 2007 Nature materials 1476-1122 6 12 966 971 2007 binary colloids edinburgh emulsion interface nature poon http://www.citeulike.org/user/dchen/article/2454003 <i>The Journal of Chemical Physics, Vol. 112, No. 6. (2000), pp. 2933-2944.</i><br /><br />  Lennard-Jones binary mixture: A thermodynamical approach to glass transition Barbara Coluzzi Giorgio Parisi Paolo Verrocchio The Journal of Chemical Physics, Vol. 112, No. 6. (2000), pp. 2933-2944. 2008-03-01T23:27:04-00:00 2000 The Journal of Chemical Physics 112 6 2933 2944 AIP binary glass thermodynamics