Bareigts Guillaume, Kiatkirakajorn Pree-Cha, Li Joaquim, Botet Robert, Sztucki Michael, Cabane Bernard, Goehring Lucas, Labbez Christophe
ICB, CNRS UMR 6303, Université Bourgogne Franche-Comté, 21000 Dijon, France.
Max Planck Institute for Dynamics and Self-Organisation (MPIDS), Göttingen 37077, Germany.
Phys Rev Lett. 2020 Feb 7;124(5):058003. doi: 10.1103/PhysRevLett.124.058003.
Monte Carlo simulations, fully constrained by experimental parameters, are found to agree well with a measured phase diagram of aqueous dispersions of nanoparticles with a moderate size polydispersity over a broad range of salt concentrations, c_{s}, and volume fractions, ϕ. Upon increasing ϕ, the colloids freeze first into coexisting compact solids then into a body centered cubic phase (bcc) before they melt into a glass forming liquid. The surprising stability of the bcc solid at high ϕ and c_{s} is explained by the interaction (charge) polydispersity and vibrational entropy.
蒙特卡洛模拟在完全由实验参数约束的情况下，被发现与在广泛的盐浓度(c_s)和体积分数(\phi)范围内具有中等尺寸多分散性的纳米颗粒水分散体的测量相图吻合得很好。随着(\phi)的增加，胶体首先冻结成共存的致密固体，然后在熔化成玻璃形成液体之前形成体心立方相（bcc）。在高(\phi)和(c_s)下bcc固体的惊人稳定性是由相互作用（电荷）多分散性和振动熵来解释的。
