Photoregulation of Ion Permeation through a Polyelectrolyte Multilayer Membrane by Manipulating the Chromophore Orientation
- Photoregulation of Ion Permeation through a Polyelectrolyte Multilayer Membrane by Manipulating the Chromophore Orientation
- Surjith K. Kumar; Jousheed Pennakalath; 김태현; 김규원; 박종구; 홍종달
- Issue Date
- Langmuir : the ACS journal of surfaces and colloids
- VOL 25, NO 3, 1767-1771
- 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.
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