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Colloidal Gelation through Thermally Triggered Surfactant Displacement
journal contribution
posted on 2019-07-11, 21:05 authored by Li-Chiun Cheng, Zachary M. Sherman, James W. Swan, Patrick S. DoyleColloidal systems that undergo gelation
attract much attention
in both fundamental studies and practical applications. Rational tuning
of interparticle interactions allows researchers to precisely engineer
colloidal material properties and microstructures. Here, contrary
to the traditional approaches where modulating attractive interactions
is the major focus, we present a platform wherein colloidal gelation
is controlled by tuning repulsive interactions. By including amphiphilic
oligomers in colloidal suspensions, the ionic surfactants on the colloids
are replaced by the nonionic oligomer surfactants at elevated temperatures,
leading to a decrease in electrostatic repulsion. The mechanism is
examined by carefully characterizing the colloids, and subsequently
allowing the construction of interparticle potentials to capture the
material behaviors. With the thermally triggered surfactant displacement,
the dispersion assembles into a macroporous viscoelastic network and
the gelling mechanism is robust over a wide range of compositions,
colloid sizes, and component chemistries. This stimulus-responsive
gelation platform is general and offers new strategies to engineer
complex viscoelastic soft materials.
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oligomer surfactantsinterparticle potentialsThermally Triggered Surfactant Displacement Colloidal systemscolloid sizesgelling mechanisminterparticle interactionsamphiphilic oligomersmaterial behaviorssurfactant displacementColloidal Gelationmaterial propertiescomponent chemistriesstimulus-responsive gelation platform
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