writer：Guoliang Li, Qin Shi, S. J. Yuan, K. G. Neoh, E. T. Kang*, Xinlin Yang*
keywords：Double-shelled hollow microspheres; Distillation precipitation polymerization.
source：期刊
specific source：Chem. Mater., 22(4), 1309-1317 (2010). DOI: 10.1021/cm903501c
Issue time：2010年
Alternating silica/polymer tetra- and penta-layer hybrid microspheres were first prepared via combined inorganic sol-gel reaction and distillation-precipitation polymerization. pH-responsive poly(methacrylic acid) (PMAA) hollow microspheres with asymmetric double-shells were produced afterHF etching of the silica layers in the SiO2/PMAAtetra-layer microspheres with different degrees of cross-linking in the two PMAA layers. On the other hand, silica “core-double shell” hollow microspheres were obtained by calcination of the alternating silica/PMAApenta-layer microspheres. The resulting hollow polymer and silica microspheres with hierarchical structures were characterized by field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) analysis, dynamic laser scattering (DLS), and confocal laser scanning microscopy (CLSM) measurements.