Photoregulation of Ion Permeation through a Polyelectrolyte Multilayer Membrane by Manipulating the Chromophore Orientation

Title
Photoregulation of Ion Permeation through a Polyelectrolyte Multilayer Membrane by Manipulating the Chromophore Orientation
Authors
Surjith K. KumarJousheed Pennakalath김태현김규원박종구홍종달
Issue Date
2009-02
Publisher
Langmuir : the ACS journal of surfaces and colloids
Citation
VOL 25, NO 3, 1767-1771
Abstract
Toward the realization of nanoscale device control, we report a novel method for photoregulation of ion flux through a polyelectrolyte multilayer membrane by chromophore orientation that is adjusted either by illumination at normal incidence or by slantwise irradiation at an angle of 10° with respect to the surface. Our results indicate that the chromophore reorientation caused by the slantwise irradiation controls the effective pore size and, consequently, the transport behavior on the nanoscale. The slantwise illumination, which includes six EZE photoisomerization cycles generated by alternately irradiating with ultraviolet (λ = 360 nm) and visible (λ = 450 nm) light, reversibly switches the orientation of E-azobenzene in the membrane between 53 ± 2° (high tilt) and 17 ± 5° (low tilt) with respect to the surface. The novel feature of this light-gated valve system is its extremely long-lived open-switch state; this behavior stands in contrast to that of other systems based on labile photoisomers, which tend to instantly return to the thermodynamically stable state.
URI
http://pubs.kist.re.kr/handle/201004/37005
ISSN
0743-7463
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE