A Single Langmuir−Blodgett Monolayer for Gas Separations

Zhang, Lan-Hui; Hendel, Robert A.; Cozzi, Pier Giorgio; Regen, Steven L.

doi:10.1021/ja983625u

Cited by 30 publications

(21 citation statements)

References 12 publications

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“…Various modification technologies have been used extensively in the materials industry. Physical blending, graft or random copolymerization, composite membrane synthesis, and surface modification have been used to improve the gas‐separation performance of these membranes …”

Section: Introductionmentioning

confidence: 99%

Effects of aging on poly(1‐trimethylsilyl‐1‐propyne) membranes irradiated with vacuum ultraviolet radiation for gas separation

Yoshioka

Miyashita

Motoo

et al. 2017

J of Applied Polymer Sci

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In this study, we investigated the effects of physical aging on the surface and gas‐transport properties of highly gas permeable poly(1‐trimethylsilyl‐1‐propyne) membranes irradiated with vacuum ultraviolet (VUV) radiation. VUV excimer lamp irradiation was performed on one side of the membrane for 6 or 60 min. The gas permeabilities for carbon dioxide (CO2) and nitrogen (N2) were determined through a volumetric measurement method at 23 °C. The gas permeabilities for CO2 and N2 increased temporarily at 7 days after 6 and 60 min of VUV irradiation of the membranes. The change in the gas permeability for N2 was more remarkable than that for CO2. These changes were related to the CO or SiOx ratio. The CO ratio was related to the gas permeability of the membranes VUV‐irradiated for 6 min, whereas the SiOx ratio was related to the gas permeability of the membranes VUV‐irradiated for 60 min. These changes affected the gas selectivities of the membranes. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45973.

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Section: Introductionmentioning

confidence: 99%

Effects of aging on poly(1‐trimethylsilyl‐1‐propyne) membranes irradiated with vacuum ultraviolet radiation for gas separation

Yoshioka

Miyashita

Motoo

et al. 2017

J of Applied Polymer Sci

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“…Free-standing films with well-defined construction and fine-controlled thickness on the nanometer scale have received increasing attention for their potential applications in separation membranes, sensors, and catalysts. − Free-standing ultrathin films simultaneously combine the properties of macroscopic materials and individual molecules or colloidal particles. It is theoretically and experimentally interesting to investigate and understand their special physical properties, which are different from those of substrate-supported films. − …”

Section: Introductionmentioning

confidence: 99%

Spontaneous Growth of Free-Standing Polypyrrole Films at an Air/Ionic Liquid Interface

Dong

Shi

et al. 2010

Langmuir

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A novel strategy for the one-pot fabrication of free-standing polypyrrole films is presented in this work. The films are spontaneously formed at an air/ionic liquid interface through interface oxypolymerization. The thicknesses of the films are finely controlled from tens to hundreds of nanometers, and the films are uniform and compact. Asymmetrical films with different smoothness on the two sides of the film are also obtained and exhibit different water wettability. This method is extremely simple and does not need any equipment. It may bring about a general methodology for forming free-standing conducting polymer films.

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“…2,3 Methods for forming thin membrane skins include phase inversion, 4,5 interfacial polymerization, 6 plasma grafting, 7,8 casting, 9 and even deposition of films from the air/water interface. 10 Despite the success of these methods, synthesizing ultrathin, selective membranes is an ongoing challenge.…”

Section: Introductionmentioning

confidence: 99%

Controlling Ion Transport through Multilayer Polyelectrolyte Membranes by Derivatization with Photolabile Functional Groups

et al. 2002

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Increasing the net fixed-charge density in multilayer polyelectrolyte membranes using postdeposition reactions results in large enhancements of ion-transport selectivity. To control the fixed-charge density in poly(acrylic acid)/poly(allylamine hydrochloride) (PAA/PAH) films, we partially derivatized PAA using 2-nitrobenzyl bromide. The underivatized −COO- groups still allow adsorption of PAA/PAH membranes on a permeable support, while postdeposition UV irradiation of these films cleaves the 2-nitrobenzyl esters to form fixed-charge sites. Diffusion dialysis experiments show that PAA/PAH membranes prepared with 23%, 50%, and 65% 2-nitrobenzyl esterified PAA exhibit Cl-/SO4 2- selectivities of 100, 150, and 170, respectively (after photolysis). Underivatized PAA/PAH membranes show a selectivity of only 10. The order of magnitude increase in selectivity resulting from derivatization occurs with a minimal decrease in Cl- flux. By modifying PAH with photolabile 2-nitrobenzyloxycarbonyl groups, we also introduced net, fixed positive charge into PAA/PAH films and improved cation (Na+/Mg2+) selectivity. Transport simulations suggest that both Donnan exclusion and selective diffusion contribute to selectivity.

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A Single Langmuir−Blodgett Monolayer for Gas Separations

Cited by 30 publications

References 12 publications

Effects of aging on poly(1‐trimethylsilyl‐1‐propyne) membranes irradiated with vacuum ultraviolet radiation for gas separation

Effects of aging on poly(1‐trimethylsilyl‐1‐propyne) membranes irradiated with vacuum ultraviolet radiation for gas separation

Spontaneous Growth of Free-Standing Polypyrrole Films at an Air/Ionic Liquid Interface

Controlling Ion Transport through Multilayer Polyelectrolyte Membranes by Derivatization with Photolabile Functional Groups

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