%0 Book Section %1 statphys23_1091 %A Bianchi, E. %A Largo, J. %A Tartaglia, P. %A Zaccarelli, E. %A Sciortino, F. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K colloids gelation patchy physical statphys23 topic-7 %T Patchy particles and thermo-reversible colloidal gelation %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=1091 %X We report theoretical and numerical evaluations of the phase diagram for patchy colloidal particles of new generation. We show that the reduction of the number of bonded nearest neighbours opens up the region of stability of the liquid phase in the temperature $T$ - packing fraction $\phi$ plane. This low-$\phi$ liquid phase is an equilibrium phase formed by a percolating network of bonded particles with a bond-lifetime essentially controlled by the bond-energy scale. Due to the progressive decrease of the critical temperature, the lifetime of these bonds will become longer and longer, giving rise to low-$\phi$ percolating long-living structures. Differently from spherically interacting particles, where phase separation always destabilizes the formation of a homogeneous arrested system at low-$T$, it is foreseeable that homogeneous states can be reached where the bond-lifetime becomes comparable to the experimental observation time. Under these conditions, a dynamic arrest phenomenon at small packing fraction will take place. It will be possible to approach dynamic arrest continuously from equilibrium and to generate a state of matter as close as possible to an ideal gel.

@incollection{statphys23_1091, abstract = {We report theoretical and numerical evaluations of the phase diagram for patchy colloidal particles of new generation. We show that the reduction of the number of bonded nearest neighbours opens up the region of stability of the liquid phase in the temperature $T$ - packing fraction $\phi$ plane. This low-$\phi$ liquid phase is an equilibrium phase formed by a percolating network of bonded particles with a bond-lifetime essentially controlled by the bond-energy scale. Due to the progressive decrease of the critical temperature, the lifetime of these bonds will become longer and longer, giving rise to low-$\phi$ percolating long-living structures. Differently from spherically interacting particles, where phase separation always destabilizes the formation of a homogeneous arrested system at low-$T$, it is foreseeable that homogeneous states can be reached where the bond-lifetime becomes comparable to the experimental observation time. Under these conditions, a dynamic arrest phenomenon at small packing fraction will take place. It will be possible to approach dynamic arrest continuously from equilibrium and to generate a state of matter as close as possible to an ideal gel.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Bianchi, E. and Largo, J. and Tartaglia, P. and Zaccarelli, E. and Sciortino, F.}, biburl = {https://www.bibsonomy.org/bibtex/22969134a33e3a1fa5e72a03133e44fbf/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {1d872b4a18ffa7f47b7cbc6f43d06b49}, intrahash = {2969134a33e3a1fa5e72a03133e44fbf}, keywords = {colloids gelation patchy physical statphys23 topic-7}, month = {9-13 July}, timestamp = {2007-06-20T10:16:38.000+0200}, title = {Patchy particles and thermo-reversible colloidal gelation}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=1091}, year = 2007 }