Dynamics and Rheology of Soft Colloidal Glasses

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

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)119-123
Number of pages5
JournalACS Macro Letters
Volume4
Issue number1
DOIs
StatePublished - Jan 7 2015
Externally publishedYes

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