Dynamics and Rheology of Soft Colloidal Glasses

Type
Article

Authors
Wen, Yu Ho
Schaefer, Jennifer L.
Archer, Lynden A.

KAUST Grant Number
KUS-C1-018-02

Online Publication Date
2015-01-07

Print Publication Date
2015-01-20

Date
2015-01-07

Abstract
© 2015 American Chemical Society. The linear viscoelastic (LVE) spectrum of a soft colloidal glass is accessed with the aid of a time-concentration superposition (TCS) principle, which unveils the glassy particle dynamics from in-cage rattling motion to out-of-cage relaxations over a broad frequency range 10-13 rad/s < ω < 101 rad/s. Progressive dilution of a suspension of hairy nanoparticles leading to increased intercenter distances is demonstrated to enable continuous mapping of the structural relaxation for colloidal glasses. In contrast to existing empirical approaches proposed to extend the rheological map of soft glassy materials, i.e., time-strain superposition (TSS) and strain-rate frequency superposition (SRFS), TCS yields a LVE master curve that satis fies the Kramers-Kronig relations which interrelate the dynamic moduli for materials at equilibrium. The soft glassy rheology (SGR) model and literature data further support the general validity of the TCS concept for soft glassy materials.

Citation
Wen YH, Schaefer JL, Archer LA (2015) Dynamics and Rheology of Soft Colloidal Glasses. ACS Macro Letters 4: 119–123. Available: http://dx.doi.org/10.1021/mz5006662.

Acknowledgements
This work was supported by the National Science Foundation, Award No. DMR-1006323 and by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). Facilities available through the Cornell Center for Materials Research (CCMR) were used for this study. The SAXS experiments were conducted at the Cornell High Energy Synchrotron Source (CHESS) which is supported by the National Science Foundation and the National Institutes of Health/National Institute of General Medical Sciences under NSF award DMR-1332208.

Publisher
American Chemical Society (ACS)

Journal
ACS Macro Letters

DOI
10.1021/mz5006662

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