Marques Flavio Augusto de Melo, Angelini Roberta, Ruocco Giancarlo, Ruzicka Barbara
Departamento de Física, Universidade Federal de Lavras , C.P. 3037, 37200-000 Lavras, MG, Brazil.
ISC-CNR, Sede Sapienza , I-00185 Roma, Italy.
J Phys Chem B. 2017 May 4;121(17):4576-4582. doi: 10.1021/acs.jpcb.6b12596. Epub 2017 Apr 19.
The time evolution of both dynamic and static structure factors of a charged colloidal clay, Laponite, dispersed in both HO and DO solvents has been investigated through multiangle dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS) as a function of weight concentration. The aging phenomenology and the formation of arrested states, both gel and glass, are preserved in DO, while the dynamics is slowed down with respect to water. These findings are important to understand the role played by the solvent in the interparticle interactions and for techniques such as neutron scattering and nuclear magnetic resonance that allow for the extension of the accessible scattering vectors and time scales.
通过多角度动态光散射（DLS）和小角X射线散射（SAXS）研究了作为重量浓度函数的、分散在水（HO）和重水（DO）溶剂中的带电胶体粘土锂皂石的动态和静态结构因子的时间演化。老化现象以及凝胶态和玻璃态等停滞态的形成在重水（DO）中得以保留，而动力学相对于水而言减慢。这些发现对于理解溶剂在粒子间相互作用中所起的作用以及对于诸如中子散射和核磁共振等技术（这些技术允许扩展可及的散射矢量和时间尺度）而言很重要。
