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

页码：355 / 360

页数：6

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