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Feb 02, 2024
Active particles can form two-dimensional crystals that are different from those formed by passive particles in equilibrium, showing extreme spontaneous deformation at large scales without melting.
Two-dimensional crystals have long fascinated theorists, but there exist many experimental realizations of them, such as electrons at the surface of Helium and colloidal particles with repulsive pair interactions confined at an interface, even though they are rather fragile and only exhibit quasi long-range positional order due to fluctuations.
Mar 16, 2010
J. Scheibert, C. Guerra, F. Célarié, D. Dalmas and D. Bonamy
Depending on their fracture mode, materials are traditionally gathered into three distinct classes: (i) ductile materials that like metals deform plastically before their fracture (ii) quasi-brittle materials such as rock or concrete, where "non-visible" damage starts to accumulate through microcracking, up to coalescence that yields to catastrophic failure. (iii) brittle materials like oxide or polymer glasses... that deform elastically up to their fracture.

 

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