Dichotomic aging behaviour in a colloidal glass

被引：58

作者：

Angelini, Roberta ^{[1
,2
]}

Zulian, Laura ^{[2
]}

Fluerasu, Andrei ^{[3
]}

Madsen, Anders ^{[4
]}

Ruocco, Giancarlo ^{[2
,5
]}

Ruzicka, Barbara ^{[1
,2
]}

机构：

[1] CNR, IPCF, I-00185 Rome, Italy

[2] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[3] Brookhaven Natl Lab, NSLS Upton 2, Upton, NY 11973 USA

[4] European Xray Free Electron Laser, D-22761 Hamburg, Germany

[5] Ist Italiano Tecnol, Ctr Life Nano Sci, Rome, Italy

来源：

SOFT MATTER | 2013年 / 9卷 / 46期

关键词：

LIGHT-SCATTERING; DYNAMICS; GELS;

D O I：

10.1039/c3sm52173g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An unexpected dichotomic long time aging behaviour is observed in a glassy colloidal clay suspension investigated by X-ray photon correlation spectroscopy and dynamic light scattering. In the long time aging regime the intensity autocorrelations are non-exponential, following the Kohlrausch-Williams-Watts functional form with an exponent beta(Q). We show that for spontaneously aged samples a stretched behaviour (beta(Q) < 1) is always found. Surprisingly a compressed exponent (beta(Q) > 1) appears only when the system is rejuvenated by application of a shear field. In both cases the relaxation times scale as Q(-1). These observations shed light on the origin of compressed exponential behaviour and help in classifying previous results in the literature on anomalous dynamics.

引用

页码：10955 / 10959

页数：5

共 27 条

[1] Probing the morphology of Laponite clay colloids by atomic force microscopy [J].

Balnois, E ;

Durand-Vidal, S ;

Levitz, P .

LANGMUIR, 2003, 19 (17) :6633-6637

[2] Evolution of particle-scale dynamics in an aging clay suspension [J].

Bandyopadhyay, R ;

Liang, D ;

Yardimci, H ;

Sessoms, DA ;

Borthwick, MA ;

Mochrie, SGJ ;

Harden, JL ;

Leheny, RL .

PHYSICAL REVIEW LETTERS, 2004, 93 (22)

[3] Aging processes and scale dependence in soft glassy colloidal suspensions [J].

Bellour, M ;

Knaebel, A ;

Harden, JL ;

Lequeux, F ;

Munch, JP .

PHYSICAL REVIEW E, 2003, 67 (03) :8

[4] Subquadratic wavenumber dependence of the structural relaxation of supercooled liquid in the crossover regime [J].

Bhattacharyya, Sarika Maitra ;

Bagchi, Biman ;

Wolynes, Peter G. .

JOURNAL OF CHEMICAL PHYSICS, 2010, 132 (10)

[5] Anomalous dynamical light scattering in soft glassy gels [J].

Bouchaud, JP ;

Pitard, E .

EUROPEAN PHYSICAL JOURNAL E, 2001, 6 (03) :231-236

[6] Universal non-diffusive slow dynamics in aging soft matter [J].

Cipelletti, L ;

Ramos, L ;

Manley, S ;

Pitard, E ;

Weitz, DA ;

Pashkovski, EE ;

Johansson, M .

FARADAY DISCUSSIONS, 2003, 123 :237-251

[7] Universal aging features in the restructuring of fractal colloidal gels [J].

Cipelletti, L ;

Manley, S ;

Ball, RC ;

Weitz, DA .

PHYSICAL REVIEW LETTERS, 2000, 84 (10) :2275-2278

[8] Liquid, glass, gel: The phases of colloidal Laponite [J].

Cummins, Herman Z. .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2007, 353 (41-43) :3891-3905

[9] Evolution of dynamics and structure during formation of a cross-linked polymer gel [J].

Czakkel, O. ;

Madsen, A. .

EPL, 2011, 95 (02)

[10] Connecting nanoscale motion and rheology of gel-forming colloidal suspensions [J].

Guo, Hongyu ;

Ramakrishnan, S. ;

Harden, James L. ;

Leheny, Robert L. .

PHYSICAL REVIEW E, 2010, 81 (05)

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