title: Straightforward functionalization of breath figures: Simultaneous orthogonal host-guest and pH-responsive interfaces.
abstract: Herein, we report the design and preparation of multireversible smart porous surfaces combining two different abilities. On the one hand, either neutral or negatively charged surfaces can be formed by formation/disruption of host-guest complexes. On the other hand, these surfaces have the capability of alternating negatively and positively charge upon complexation of a polycation. Moreover, these two functionalization steps were demonstrated to be reversible so that the initial surface can be recovered and employed again. For this purpose, first, a copolymer was prepared by polymerization of two different monomers, i.e. styrene (S) and a styrene modified with cyclodextrin (SCD) by click chemistry. Blends of this copolymer and polystyrene were employed to fabricate porous surfaces with controlled pore sizes and chemical distribution by the breath figures technique. More precisely, the cyclodextrin (CD) moieties, specifically located inside the holes of the surface, interact reversibly with adamantane end-terminated poly(acrylic acid) chain (Ada-PAA85). The latter served to establish electrostatic interaction with a polycation (poly-L-lysine, PLL), leading to positively charged surface. These interactions, both host-guest and electrostatic, can be inverted obtaining again the original surface, proving the full reversibility of the system.
authors.affiliation: Instituto de Ciencia y Tecnología de Polímeros (ICTP), Consejo Superior de Investigaciones Científicas (CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Sanz de León
authors.affiliation: Departamento de Química Física Aplicada, Facultad de Ciencias, Universidad Autónoma de Madrid, C/Francisco Tomás y Valiente 7, Cantoblanco, 28049 Madrid, Spain. Electronic address: alexandra.munnoz@uam.es.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Muñoz-Bonilla
authors.affiliation: Instituto de Ciencia y Tecnología de Polímeros (ICTP), Consejo Superior de Investigaciones Científicas (CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Gallardo
authors.affiliation: Instituto de Química Orgánica General, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Fernandez-Mayoralas
authors.affiliation: Université de Lyon, Lyon F-69003, France; INSA-Lyon, IMP, Villeurbanne F-69621, France; CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Villeurbanne F-69621, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Bernard
authors.affiliation: Instituto de Ciencia y Tecnología de Polímeros (ICTP), Consejo Superior de Investigaciones Científicas (CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain. Electronic address: jrodriguez@ictp.csic.es.
authors.forename: Juan
authors.initials: J
authors.lastname: Rodríguez-Hernández
keywords: Breath figures; Honeycomb structured surfaces; Orthogonal surface functionalization; Reversible surface functionalization; Stimuli-responsive surfaces