Cucurbit[8]uril‐Regulated Colloidal Dispersions Exhibiting Photocontrolled Rheological Behavior. Issue 14 (27th February 2018)

• Record Type: Journal Article
• Authors: Hu, Chi; Liu, Ji; Wu, Yuchao; West, Kevin R.; Scherman, Oren A.
• Is Part Of: Small. Volume 14:Issue 14(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-02-27
• Subjects: cucurbituril -- nanoparticles -- rheology -- self‐assembly -- supramolecular chemistry; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201703352
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: In situ photocontrol over shear‐thickening of condensed colloidal dispersions is of paramount importance in a wide range of applications including process technology and photorheological fluids. Its development and practicability, however, are hampered by the lack of well‐designed photoresponsive systems. Here, a colloidal suspension whose rheological behavior is readily switchable between shear‐thinning and shear‐thickening using an external light stimulus is reported. This smart colloidal solution contains hybrid raspberry‐like colloids prepared by employing cucurbit[8]uril as a supramolecular linker to assemble functional Fe3 O4 nanoparticles onto a silica core. The formed raspberry colloids are photoresponsive and can be reversibly disassembled under UV irradiation. Abstract : Photoresponsive reversible shear thickening in raspberry‐like colloidal dispersion : Hybrid raspberry‐like colloids composed of Fe3 O4 corona nanoparticles and silica core are assembled using cucurbit[8]uril as a supramolecular linker. The light‐controlled reversibility of this assembly process gives rise to fine control over interparticle forces and the resulting rheological properties.