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- Title
Ultrathin pH-Sensitive Nanoporous Membranes for Superfast Size-Selective Separation.
- Authors
Zhang, Qiu Gen; Deng, Chao; Liu, Rong Rong; Lin, Zhen; Li, Hong Mei; Zhu, Ai Mei; Liu, Qing Lin
- Abstract
Stimuli-responsive nanoporous membranes have attracted increasing interest in various fields due to their abrupt changes of permeation/separation in response to the external environment. Here we report ultrathin pH-sensitive nanoporous membranes that are easily fabricated by the self-assembly of poly(acrylic acid) (PAA) in a metal hydroxide nanostrand solution. PAA-adsorbed nanostrands (2.5-5.0 nm) and PAA-CuII nanogels (2.0-2.5 nm) grow competitively during self-assembly. The PAA-adsorbed nanostrands are deposited on a porous support to fabricate ultrathin PAA membranes. The membranes display ultrafast water permeation and good rejection as well as significant pH-sensitivity. The 28 nm-thick membrane has a water flux decrease from 3740 to 1350 L m−1 h−1 bar−1 (pH 2.0 to 7.0) with a sharp decrease at pH 5.0. This newly developed pH-sensitive nanoporous membranes may find a wide range of applications such as controlled release and size- and charge-selective separation.
- Subjects
ARTIFICIAL membranes; NANOPOROUS materials; MOLECULAR self-assembly; POLYACRYLIC acid; NANOGELS; ULTRAFILTRATION
- Publication
Chemistry - An Asian Journal, 2015, Vol 10, Issue 5, p1133
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201500121