title: Selective permeation of hydrogen gas using cellulose nanofibril film.
abstract: Biobased membranes that can selectively permeate hydrogen gas have been developed from aqueous dispersions of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCN) prepared from wood cellulose: TOCN-coated plastic films and self-standing TOCN films. Compared with TOCNs with sodium, lithium, potassium, and cesium carboxylate groups, TOCN with free carboxyl groups (TOCN-COOH) had much high and selective H2 gas permeation performance. Because permeabilities of H2, N2, O2, and CO2 gases through the membranes primarily depended on their kinetic diameters, the gas permeation behavior of the various TOCNs can be explained in terms of a diffusion mechanism. Thus, the selective H2 gas permeability for TOCN-COOH was probably due to a larger average size in free volume holes present between nanofibrils in the layer and film than those of other TOCNs with metal carboxylate groups. The obtained results indicate that TOCN-COOH membranes are applicable as biobased H2 gas separation membranes in fuel cell electric power generation systems.
authors.affiliation: Department of Biomaterials Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan.
authors.forename: Hayaka
authors.initials: H
authors.lastname: Fukuzumi
authors.forename: Shuji
authors.initials: S
authors.lastname: Fujisawa
authors.forename: Tsuguyuki
authors.initials: T
authors.lastname: Saito
authors.forename: Akira
authors.initials: A
authors.lastname: Isogai
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002483:Cellulose, Oxidized / Q000737:chemistry*; D003497:Cyclic N-Oxides / Q000737:chemistry; D004058:Diffusion; D006859:Hydrogen / Q000737:chemistry*; D007700:Kinetics; D008567:Membranes, Artificial; D057139:Nanofibers / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010539:Permeability; D016062:Porosity; D013499:Surface Properties
chemical_list: D002483:Cellulose, Oxidized; D003497:Cyclic N-Oxides; D008567:Membranes, Artificial; D002245:Carbon Dioxide; D006859:Hydrogen; D009584:Nitrogen; D010100:Oxygen; C003959:TEMPO