期刊
LANGMUIR
卷 31, 期 21, 页码 5919-5927出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.5b00717
关键词
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资金
- National Science Foundation [CBET 1403686]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1403686] Funding Source: National Science Foundation
Layer-by-layer assembly was used to create quadlayers (QLs) of chitosan (CH), poly(acrylic acid) (PAA), CH, and graphene oxide (GO). Electron microscopy confirmed GO coverage over the film and a highly ordered nanobrick wall structure. By varying pH deviation between CH and PAA, a thick and interdiffused polymer matrix was created because of the altered chain conformation. A 5 CH (pH 5.5)/ PAA (pH 3)/CH (pH 5.5)/GO QL assembly (48 nm) exhibits very low oxygen permeability (3.9 X 10(-20) cm(3) cm cm(-2) Pa-1 s(-1)) that matches SiOx barrier coatings. In an effort to maintain barrier performance under high humidity, GO was thermally reduced to increase hydrophobicity of the film. This reduction step increased H-2/CO2 selectivity of a 5 QL film from 5 to 215, exceeding Robeson's upper bound limit. This unique water-based multilayer nanocoating is very promising for a variety of gas purification,and packaging applications.
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