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Dynamics of Dense Suspensions of Star‐Like Micelles with Responsive Fixed Cores
Author(s) -
Loppinet Benoit,
Fytas George,
Vlassopoulos Dimitris,
Likos Christos N.,
Meier Gerd,
Liu Guo Jun
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200400165
Subject(s) - micelle , brownian dynamics , copolymer , dynamic light scattering , diffusion , neutron scattering , colloid , hydrodynamic radius , materials science , methacrylate , polymer chemistry , chemical engineering , swelling , small angle neutron scattering , viscosity , static light scattering , chemical physics , brownian motion , chemistry , scattering , polymer , thermodynamics , composite material , nanotechnology , nanoparticle , physics , optics , aqueous solution , engineering , quantum mechanics
Summary: PBMA‐PCEMA block copolymer micelles, consisting of poly(2‐cinnamoyloxyethyl methacrylate) (PCEMA) cross‐linked core and poly(butyl methacrylate) (PBMA) hairs (shell), are used as model responsive soft colloids, where the core swelling can be tuned by changing solvent quality. Our extensive dynamic light scattering study, complemented by viscosity and small angle neutron scattering (SANS) measurements, demonstrates the richness of dynamics of such dense micellar suspensions and in particular the strong influence of solvent‐mediated core swelling on the concentration dependence of the self‐diffusion. Brownian dynamics (BD) simulations using appropriate effective core‐core interactions support these findings. Such novel micelles offer new possibilities for controlling the interactions and macroscopic properties of colloidal suspensions.The self‐diffusion coefficient D for core‐shell particles, as calculated from the Brownian dynamics simulations.