The dynamical fragile-to-strong crossover in attractive colloidal systems

被引：3
作者：
Mallamace, Francesco [1 ,2 ]
Corsaro, Carmelo [1 ]
Vasi, Cirino [3 ]
Vasi, Sebastiano [3 ]
Mallamace, Domenico [4 ]
Chen, Sow-Hsin [2 ]
机构：
[1] Univ Messina, Dipartimento Fis & Sci Terra, I-98168 Messina, Italy
[2] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA
[3] CNR, IPDF, I-98158 Messina, Italy
[4] Univ Messina, Dipartimento SASTAS, I-98168 Messina, Italy
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2015年 / 407卷
关键词：
Diverging processes; Dynamic crossover; Fragile to strong transition; Glass forming materials; Soft-matter; GLASS-FORMING LIQUIDS; SUPERCOOLED LIQUIDS; TRANSITION; RELAXATION; TEMPERATURE; SCATTERING; VISCOELASTICITY; SUSPENSIONS; PERCOLATION; VISCOSITY;
D O I：
10.1016/j.jnoncrysol.2014.08.010
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The dynamics of a hierarchical colloid solution, dendrimer in methanol, has been studied using photon-correlation spectroscopy (PCS). The obtained relaxation curves are analyzed accordihg to the mode-coupling theory (MCT). The main results are: i) the occurrence of a fragile to strong dynamical crossover as a function of the packing fraction at phi(c) similar or equal to 0.39, and ii) the observation of a secondary relaxation (beta) that has its onset just at the dynamical crossover and is correlated with the primary alpha-relaxation. Finally we discuss the obtained findings in comparison with recent experiments in similar systems characterized by an attractive interaction obtaining a confirmation on the primary role of the dynamical crossover in the physics of the dynamical arrest. (c) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：355 / 360
页数：6
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