Capillary force induced formation of monodisperse polystyrene/silica organic-inorganic hybrid hollow spheres.
This paper presents a "one-spot" procedure to fabricate polystyrene/silica (PS/SiO(2)) hybrid hollow spheres. In this approach, when poly(vinylpyrrolidone)-stabilized PS colloids were deposited by sol-gel derived silica layer under acidic medium, it was interesting to find that the PS/SiO(2) core-shell colloids gradually changed to hollow structure spontaneously in the same medium as reaction went on. The formation of this hollow structure should be attributed to the diffusion of PS macromolecular chains from core particles into the voids between silica nanoparticles driven by the strong capillary force.
Leng
Wenguang
W
Department of Materials Science and the Key Laboratory of Molecular Engineering of Polymers of MOE, the Advanced Coating Research Center of MOE, Fudan University, Shanghai 200433, PR China.
Chen
Min
M
Zhou
Shuxue
S
Wu
Limin
L
D003102:Colloids / Q000737:chemistry; D004058:Diffusion; D053758:Nanoparticles / Q000737:chemistry; D010316:Particle Size; D011137:Polystyrenes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
D003102:Colloids; D011137:Polystyrenes; D012822:Silicon Dioxide