DIBLOCK THIN-FILMS WITH DENSELY HEXAGONALLY PACKED NANOCHANNELS

Authors
Citation
Gj. Liu et Jf. Ding, DIBLOCK THIN-FILMS WITH DENSELY HEXAGONALLY PACKED NANOCHANNELS, Chemical engineering & technology, 21(2), 1998, pp. 211-213
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Engineering, Chemical
Journal title
ISSN journal
0930-7516
Volume
21
Issue
2
Year of publication
1998
Pages
211 - 213
Database
ISI
SICI code
0930-7516(1998)21:2<211:DTWDHP>2.0.ZU;2-V
Abstract
Films, 2 mu m thick, with hexagonally packed and uniformly sized nanoc hannels with a diameter of similar to 17 nm and at a density of simila r to 5 x 10(10) cm(-2) were prepared. These channels were partially fi lled with poly(acrylic acid) (PAA) and the structural change of PAA ch ains with variations in pH, ionic strength; and ion type caused water permeability to change by several orders of magnitude. These membranes with ''chemical valves'' should be useful in controlled drug release or chemical sensing. In cyclopentane. the PAA chains probably collapse onto the channel walls and the channel centers should open up. The ch annels allowed the separation of species according to their difference in size and this property should be useful for future studies of poly mer chain reptation through the nanochannels.