Gelation as arrested phase separation in short-ranged attractive   colloid-polymer mixtures
  We present further evidence that gelation is an arrested phase separation in attractive colloid-polymer mixtures, based on a method combining confocal microscopy experiments with numerical simulations recently established in {\bf Nature 453, 499 (2008)}. Our results are independent of the form of the interparticle attractive potential, and therefore should apply broadly to any attractive particle system with short-ranged, isotropic attractions. We also give additional characterization of the gel states in terms of their structure, inhomogeneous character and local density. 
Emanuela Zaccarelli, Peter J. Lu, Fabio Ciulla, David. A. Weitz and   Francesco Sciortino