Thermoresponsive colloidal crystals built from core-shell poly(styrene/alpha-tert-butoxy-omega-vinylbenzylpolyglycidol) microspheres.
Core-shell particles of poly(styrene/alpha-tert-butoxy-omega-vinylbenzylpolyglycidol) P(S/PGL) were used as new building blocks for the assembly of a colloidal crystal. The added-value properties of these particles for photonic crystal architectures are their high hydrophilicity together with their thermoresponsivity. Indeed, the poglycidol-rich shell undergoes a phase transition above 45 degrees C, which leads to its collapse at the particle surface accompanied by a decrease in the particle diameter. The three-dimensional crystalline arrays display Bragg diffraction properties, as judged by angle-resolved reflectance spectroscopy. The thermoresponsivity of the colloidal assemblies was observed through modifications of their optical properties with respect to the temperature used during the assembly process. The wetting properties of the crystalline material were also shown to reversibly switch from hydrophilic to hydrophobic as a function of the assembly temperature, thus evidencing the reorganization of the surface polyglycidol chains during the polymer phase transition. This work shows conclusively that P(S/PGL) particles are promising alternatives to poly(N-isopropylacrylamide) and poly(ethylene glycol) particles for the elaboration of thermoresponsive colloidal crystals, with a phase transition situated in between those of these two polymers.
Griffete
Nebewia
N
ITODYS, Université Paris Diderot and CNRS (UMR 7086), 15 rue Jean de Baif, 75013 Paris, France.
Dybkowska
Monika
M
Glebocki
Bartosz
B
Basinska
Teresa
T
Connan
Carole
C
Maître
Agnès
A
Chehimi
Mohamed M
MM
Slomkowski
Stanislaw
S
Mangeney
Claire
C