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Formation of Hollow Silica Colloids through a Spontaneous Dissolution–Regrowth Process
Author(s) -
Zhang Tierui,
Ge Jianping,
Hu Yongxing,
Zhang Qiao,
Aloni Shaul,
Yin Yadong
Publication year - 2008
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200800927
Subject(s) - dissolution , colloid , silicate , aqueous solution , chemical engineering , decomposition , colloidal silica , process (computing) , chemistry , nanotechnology , spheres , materials science , mineralogy , organic chemistry , computer science , physics , engineering , operating system , astronomy , coating
From the inside out : Silica colloids can be spontaneously transformed from solid spheres to hollow structures in aqueous solutions of NaBH 4 (see picture). The high pH value and gradual decomposition of NaBH 4 facilitate the formation of hollow structures first by partial dissolution of silica cores and then by regrowth of the silicate species on the colloid surfaces to form shells.