Silsesquioxane/polyamine nanoparticle-templated formation of star- or raspberry-like silica nanoparticles.
Silica is an important mineral in biology and technology, and many protocols have been developed for the synthesis of complex silica architectures. The current report shows that silsesquioxane nanoparticles carrying polymer arms on their surface are efficient templates for the fabrication of silica particles with a star- or raspberry-like morphology. The shape of the resulting particles depends on the chemistry of the polymer arms. With poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) arms, spherical particles with a less electron dense core form. With poly{[2-(methacryloyloxy)ethyl] trimethylammonium iodide} (PMETAI), star- or raspberry-like particles form. Electron microscopy, electron tomography, and small-angle X-ray scattering show that the resulting silica particles have a complex structure, where a silsequioxane nanoparticle carrying the polymer arms is in the center. Next is a region that is polymer-rich. The outermost region of the particle is a silica layer, where the outer parts of the polymer arms are embedded. Time-resolved zeta-potential and pH measurements, dynamic light scattering, and electron microscopy reveal that silica formation proceeds differently if PDMAEMA is exchanged for PMETAI.
Kind
Lucy
L
Department of Chemistry, University of Basel, CH-4056 Basel.
Plamper
Felix A
FA
Göbel
Ronald
R
Mantion
Alexandre
A
Müller
Axel H E
AH
Pieles
Uwe
U
Taubert
Andreas
A
Meier
Wolfgang
W
D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles; D017646:Organosilicon Compounds / Q000737:chemistry*; D011073:Polyamines / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
D017646:Organosilicon Compounds; D011073:Polyamines