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Exploring Colloidal Gel Formation: Short-Range Attractions and Long-Range Repulsions

Journey through the intricate formation of colloidal gels by manipulating attractions and repulsions. Discover how to achieve ideal gel properties while avoiding phase separation and crystallization. Delve into the mechanisms of cluster stability and interactions to understand the dynamics of gel formation at varying temperatures.

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Exploring Colloidal Gel Formation: Short-Range Attractions and Long-Range Repulsions

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  1. A new route to the formation ofcolloidal gels • Playing with • Short Range Attractions and Long Range Repulsions • Stefano Mossa, Francesco Sciortino, Piero • Tartaglia, Emanuela Zaccarelli

  2. Motivation: Segre et al PRL 86 (2001)

  3. The quest for the ideal (thermoreversible) gel….model The quest 1) Long Living reversible bonds 2)No Phase Separation 3) No Crystallization Are 1 and 2 mutually exclusive ? Low Temperature Long Bond Lifetime Condensation

  4. Phase Diagram for Square Well (3%) Repulsive Glass Iso-diffusivity lines Percolation Line Spinodal AHS (Miller&Frenkel) A3 Attractive Glass Liquid+Gas

  5. How to stay at low T without condensation ? Reasons for condensation (Frank, Hill, Coniglio) Physical Clusters at low T if the infinite cluster is the lowest energy state How to make the surface more stable than the bulk ? The quest

  6. The case of an attractive potential Cluster Ground State for the 2n-n potential (Lekkerkerker)

  7. ADD HERE SOMETHINGDISNMORE • AND POON......

  8. How to make negative ? Upper Limit Optimal Size Groenewold and Kegel

  9. How do clusters interact ?

  10. Molecular Dynamics Data for Repulsive Yukawa Potential Several number densities n

  11. The Optimal Size Controls if the system is going to be a cluster phase or an arrested disordered state (Wigner Glass) Are the simulation data providing support for this picture ?

  12. The T-dependence of S(q) =0.15

  13. T-dependence of the cluster size distribution

  14. Dynamics... Collective Density autocorrelation function

  15. T=0.15 T=0.10

  16. A case in which clustering is.... home made ! Star Polymers low f high f

  17. Cluster Phase stabilized by the competition of Short-Ranged and Repulsive-Long-Ranged interactions The disordered arrest problem has been expressed in term of glass transition of cluster Colloidal Gels = Wigner Glasses

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