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Transparent, Ultrahigh‐Gas‐Barrier Films with a Brick–Mortar–Sand Structure
Author(s) -
Dou Yibo,
Pan Ting,
Xu Simin,
Yan Hong,
Han Jingbin,
Wei Min,
Evans David G.,
Duan Xue
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201503797
Subject(s) - polyacrylic acid , gaseous diffusion , mortar , hydroxide , materials science , brick , diffusion , molecule , nanotechnology , chemical engineering , adsorption , diffusion barrier , barrier layer , layer (electronics) , composite material , chemistry , polymer , inorganic chemistry , organic chemistry , fuel cells , physics , engineering , thermodynamics
Transparent and flexible gas‐barrier materials have shown broad applications in electronics, food, and pharmaceutical preservation. Herein, we report ultrahigh‐gas‐barrier films with a brick–mortar–sand structure fabricated by layer‐by‐layer (LBL) assembly of XAl‐layered double hydroxide (LDH, X=Mg, Ni, Zn, Co) nanoplatelets and polyacrylic acid (PAA) followed by CO 2 infilling, denoted as (XAl‐LDH/PAA) n ‐CO 2 . The near‐perfectly parallel orientation of the LDH “brick” creates a long diffusion length to hinder the transmission of gas molecules in the PAA “mortar”. Most significantly, both the experimental studies and theoretical simulations reveal that the chemically adsorbed CO 2 acts like “sand” to fill the free volume at the organic–inorganic interface, which further depresses the diffusion of permeating gas. The strategy presented here provides a new insight into the perception of barrier mechanism, and the (XAl‐LDH/PAA) n ‐CO 2 film is among the best gas barrier films ever reported.