Pennakalathil, Jousheed Kim, Tae-Hyun Kim, Kyuwon Woo, Kyoungja Park, Jong-Ku Hong, Jong-Dal 2024-01-20T19:01:29Z 2024-01-20T19:01:29Z 2021-09-05 2010-07-06 0743-7463 https://pubs.kist.re.kr/handle/201004/131262 This paper describes a pH-responsive multilayer film composed of two layered components, namely poly(allylamine hydrochloride) (PAH) and a copolymer of acrylic acid and [1,3]oxazine-modified acrylate (POA). The oxazine ring is an acidochromic chromophore and opens to form either cationic 3H-indolium or anionic hemiaminal in a pH-dependent manner. This structural transition was used to generate a net positive or negative charge on the membrane for selective ion permeation. Interestingly, the reversible oxazine ring opening and closing proceeded smoothly without significant steric hindrance in the multilayer film comprising 10 PAH/POA bilayers. The pH-responsive permselectivity for cationic and anionic probe molecules was demonstrated using a POA monolayer film adsorbed electrostatically onto an amino-functionalized ITO electrode. The origin of the excellent ion-transport selectivity in the 1 nm ultrathin POA membrane is discussed in terms of alternating charges of the aromatic amphoteric group, oxazine, in the polyeletrolyte membrane. English AMER CHEMICAL SOC SELF-ASSEMBLY PROCESS PERVAPORATION SEPARATION NANOTUBULE MEMBRANES POROUS MEMBRANE TRANSPORT ULTRATHIN FILMS PERMEABILITY ADSORPTION PERMEATION Ion-Permselective Polyelectrolyte Multilayer Membrane Installed with a pH-Sensitive Oxazine Switch Article 10.1021/la1007044 1 LANGMUIR, v.26, no.13, pp.11349 - 11354 LANGMUIR 26 13 11349 11354 scie scopus 000279239900128 2-s2.0-77954301084 Chemistry, Multidisciplinary Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article SELF-ASSEMBLY PROCESS PERVAPORATION SEPARATION NANOTUBULE MEMBRANES POROUS MEMBRANE TRANSPORT ULTRATHIN FILMS PERMEABILITY ADSORPTION PERMEATION polyelectrolyte membrane pH-sensitive switch chromophore ion-permselective