Synthesis of Poly(methacrylic acid)-MnO(OH)2/SiO2 Core-shell and the Corresponding Hollow Microspheres Containing Mn2O3
作者：Shuxuan Sun, Bin Liu, Xiaomeng Fu, Meijun Zhou, Guomin Bian, Yonglin Qi, and Xinlin Yang*,
關鍵字：Polymer/inorganic core-shell microsphere; Mn2O3/m-SiO2 double-shelled hollow microsphere; Braunite-1Q hollow microsphere; Mn2O3 hollow microsphere.
論文來源：期刊
具體來源：J Colloid Interface Sci, 438 (1), 269-276 (2015).
發表時間：2015年
Poly(methacrylic acid)-MnO(OH)2/SiO2 core-shell microspheres were prepared by the sol-gel hydrolysis of tetraethylorthosilicate
(TEOS) in presence of poly(methacrylic acid)-Mn(II) (PMAA-Mn2+) as
template with ammonium hydroxide anion as the catalyst and n-octadecyltrimethoxysilane (C18TMS) as pore-directing
reagent. The PMAA-Mn2+ core was prepared by incubation of Mn2+ cations with PMAA microspheres via the coordination between the carboxylate
anion group on PMAA microsphere and Mn2+ cations. During this
process, the Mn(II) specie were formed as white Mn(OH)2 at first and
it was subsequently oxidized into brown MnO(OH)2 in air. The Mn2O3/mesoporous
silica (Mn2O3/m-SiO2)
double-shelled hollow microspheres (DSHMs) were prepared through the calcination
of the PMAA-MnO(OH)2/SiO2 core-shell microspheres at 600 oC
for selective removal of the PMAA template and the pore-directing organic
component from C18TMS, in which the crystalline structure of DSHM
was developed into Braunite-1Q via the
reaction between Mn2O3 inner-shell and silica outer-shell
by annealing the DSHMs under higher temperatures of 800 and 900 oC. The
Mn2O3 hollow microspheres (HMs) were prepared through the
selective removal of the silica layer from the DSHMs by sodium hydroxide
aqueous solution, which exhibited structure integrity and good ethanol dispersity
due to presence of mesoporous structure.