Silica
Nanotubes Decorated by pH-Responsive Diblock Copolymers for Controlled
Drug Release
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Abstract
A novel
nanocontainer, which has silica nanotube (SNT) core and pH-sensitive
polymer shell attaching on the exterior surface of silica nanotube,
is presented in this paper. Polymer nanorods, which are conveniently
fabricated though polymerization-induced self-assembly and reorganization
method, are used as templates for the deposition of silica to fabricate
hybrid nanorods. Calcination of as-synthesized silica hybrid nanorods
leads to hollow SNTs. SNTs are functionalized with reversible addition–fragmentation
chain transfer (RAFT) agent, then surface RAFT polymerization is conducted
to get poly(2-(diethylamino)ethyl methacrylate)-<i>b</i>-poly(oligo(ethylene glycol) methacrylate)-coated SNTs (SNT-PDEAEMA-<i>b</i>-POEGMA). Doxorubicin (DOX) can be encapsulated in SNT-PDEAEMA-<i>b</i>-POEGMA, and controlled release of loaded DOX is achieved
by adjusting pH of the medium. In vitro cell viability and cellular
internalization study confirm the potential application of this nanocontainer
in drug and gene delivery