Ruzicka B, Zulian L, Angelini R, Sztucki M, Moussaïd A, Ruocco G
SOFT INFM-CNR and Dipartimento di Fisica, Università di Roma La Sapienza, Rome, Italy.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Feb;77(2 Pt 1):020402. doi: 10.1103/PhysRevE.77.020402. Epub 2008 Feb 20.
The aging of a charged colloidal system has been studied by small-angle x-ray scattering, in the exchanged momentum range Q=0.03-5 nm(-1) , and by dynamic light scattering, at different clay concentrations (C(w)=0.6-2.8%) . The static structure factor S(Q) has been determined as a function of both aging time and concentration. This is the direct experimental evidence of the existence and evolution with aging time of two different arrested states in a single system simply obtained only by changing its volume fraction: an inhomogeneous state is reached at low concentrations, while a homogeneous one is found at high concentrations.
通过小角X射线散射，在交换动量范围Q = 0.03 - 5 nm⁻¹内，以及通过动态光散射，在不同粘土浓度（C(w)=0.6 - 2.8%）下，研究了带电胶体系统的老化过程。已确定静态结构因子S(Q)是老化时间和浓度的函数。这是在单一系统中仅通过改变其体积分数就简单获得的两种不同停滞状态随老化时间的存在和演变的直接实验证据：在低浓度下达到非均匀状态，而在高浓度下发现均匀状态。
