Abstract
Reversible assembly of Janus particles was manipulated by host-guest interaction of β-cyclodextrin (β-CD) and azobenzene. One side of every Janus particle was modified with β-CD. Superstructures of Janus particles were formed by adding azobenzene-containing polymers to the dispersion of Janus particles. The superstructures were reversibly disassembled by adding α-CD or light irradiation.
Highlights
Reversible assembly of Janus particles was manipulated by host– guest interaction of b-cyclodextrin (b-CD) and azobenzene
Superstructures of Janus particles assembled by DNA linkers and wetting-induced attraction can be switched by changing the temperatures of the systems in water and water/ 2,6-lutidine mixtures, respectively.4a,b These results nicely demonstrated the feasibility of using Janus particles for stimuli-responsive materials
Adding competitive host molecules to the complex can extract azobenzene from b-CD and lead to disassembly of the complex.6a,b Alternatively, UV illumination can disassemble the complex of azobenzene and b-CD due to photoisomerization of azobenzene.6c,d Responsive host–guest interactions have been utilized to prepare various stimuli-responsive systems, such as vesicles,[7] raspberry-like colloids,[8] biointerfaces,6c hydrogels,[9] and macroscopic assemblies.6a,b,10 no attention has been focused on constructing stimuli-responsive superstructures of Janus particles via host–guest interactions
Summary
Reversible assembly of Janus particles was manipulated by host– guest interaction of b-cyclodextrin (b-CD) and azobenzene. Superstructures of Janus particles were formed by adding azobenzene-containing polymers to the dispersion of Janus particles. The superstructures were reversibly disassembled by adding a-CD or light irradiation. Host–guest interaction could be a general bonding strategy for constructing responsive superstructures of Janus particles.
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