Kumar, Surjith K. Pennakalathil, Jousheed Kim, Tae-Hyun Kim, Kyuwon Park, Jong-Ku Hong, Jong-Dal 2024-01-20T22:01:34Z 2024-01-20T22:01:34Z 2021-09-03 2009-02-03 0743-7463 https://pubs.kist.re.kr/handle/201004/132749 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 degrees 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 (lambda = 360 nm) and visible (lambda = 450 nm) light, reversibly switches the orientation of E-azobenzene in the membrane between 53 +/- 2 degrees (high tilt) and 17 +/- 5 degrees (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. English AMER CHEMICAL SOC METHOXYAZOBENZENE SIDE-CHAINS AZOBENZENE LIQUID-CRYSTAL POLYMERIC FILMS COMPOSITE FILMS LIGHT TRANSPORT CONDUCTIVITY PERMEABILITY IRRADIATION GRAMICIDIN Photoregulation of Ion Permeation through a Polyelectrolyte Multilayer Membrane by Manipulating the Chromophore Orientation Article 10.1021/la803316s 1 LANGMUIR, v.25, no.3, pp.1767 - 1771 LANGMUIR 25 3 1767 1771 scie scopus 000262827400075 2-s2.0-61549104492 Chemistry, Multidisciplinary Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article METHOXYAZOBENZENE SIDE-CHAINS AZOBENZENE LIQUID-CRYSTAL POLYMERIC FILMS COMPOSITE FILMS LIGHT TRANSPORT CONDUCTIVITY PERMEABILITY IRRADIATION GRAMICIDIN