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Published on: January 25, 2019
Dual aging behaviour in a clay-polymer dispersion
Laura Zulian1, Flavio Augusto de Melo Marques, Elisa Emilitri
1Dipartimento di Scienza dei Materiali, Università degli Studi Milano Bicocca, Via Roberto Cozzi, 53 20125 Milano, Italy. laura.zulian@mater.unimib.it.
Adding poly(ethylene oxide) (PEO) to Laponite clay dispersions alters aging dynamics. A critical PEO concentration controls whether aging speeds up or slows down, enabling tunable control over clay-polymer interactions.
Area of Science:
- Colloidal science
- Materials science
- Polymer chemistry
Background:
- Clay-polymer compounds exhibit complex rheological behavior.
- Laponite clay dispersions age from liquid to arrested states (gel/glass).
- Aging depends on clay concentration and ionic strength.
Purpose of the Study:
- Investigate poly(ethylene oxide) (PEO) effects on Laponite clay aging dynamics.
- Determine how PEO molecular weight and concentration influence aging.
- Understand the mechanisms controlling PEO-Laponite system aging.
Main Methods:
- Dynamic light scattering (DLS) used to study aging.
- Laponite dispersions at fixed concentration (2.0%) studied.
- Varying PEO concentrations (0.05-0.50%) and molecular weights (100, 200 kg/mol) examined.
Main Results:
- A critical PEO concentration (C) was identified.
- Below C, PEO accelerates Laponite aging (assisted).
- Above C, PEO hinders Laponite aging (hindered).
Conclusions:
- PEO addition provides tunable control over Laponite clay aging speed.
- Competitive adsorption mechanisms on clay surfaces likely explain observed phenomena.
- This control allows manipulation of complex interparticle interactions in PEO-Laponite systems.
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