Premium
pH‐Responsive Nanoporous Silica Colloidal Membranes
Author(s) -
Schepelina Olga,
Poth Nils,
Zharov Ilya
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201000369
Subject(s) - membrane , nanopore , materials science , nanoporous , colloid , polymer , diffusion , gating , methacrylate , chemical engineering , colloidal silica , polymer chemistry , nanotechnology , copolymer , composite material , biophysics , chemistry , coating , biochemistry , physics , biology , engineering , thermodynamics
Free‐standing colloidal membranes (nanofrits) with varied thickness and nanopore size are fabricated and modified with pH‐responsive poly(2‐(dimethylamino)ethyl methacrylate) brushes. The polymer‐modified nanofrits demonstrate excellent gating behavior for molecular diffusion: in the presence of acid, the diffusion rate of positively charged species significantly decreases. Increasing the polymer length and membrane thickness and decreasing the nanopore size leads to the complete acid‐controlled gating of the membranes.