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Ha, Heonjoo
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Publications (6/6 displayed)
- 2021Gas sorption and diffusion in poly(dimethylsiloxane) (PDMS)/graphene oxide (GO) nanocomposite membranescitations
- 2020Unusual Thermal Properties of Certain Poly(3,5-disubstituted styrene)scitations
- 2017Generating Large Thermally Stable Marangoni-Driven Topography in Polymer Films by Stabilizing the Surface Energy Gradientcitations
- 2017Reduced-Graphene Oxide/Poly(acrylic acid) Aerogels as a Three-Dimensional Replacement for Metal-Foil Current Collectors in Lithium-Ion Batteriescitations
- 2017Thermally cross-linked poly(acrylic acid)/reduced-graphene oxide aerogels as a replacement for metal-foil current collectors in lithium-ion batteries
- 2016Marangoni instability driven surface relief grating in an azobenzene-containing polymer filmcitations
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article
Gas sorption and diffusion in poly(dimethylsiloxane) (PDMS)/graphene oxide (GO) nanocomposite membranes
Abstract
<p>Gas solubility and diffusivity are reported for a series of poly(dimethylsiloxane) (PDMS)/graphene oxide (GO) nanocomposites. The nanocomposites were prepared via a crosslinking reaction between the amino-terminal end groups of the telechelic PDMS and epoxide groups on the surface of GO. Gas solubilities of N<sub>2</sub>, O<sub>2</sub>, CH<sub>4</sub>, and CO<sub>2</sub> were measured at 35 °C over a range of pressures. Gas solubility in the nanocomposites was unaffected by GO at the maximum loading of 8 wt%. Therefore, a previously reported decrease in the nanocomposite permeability with increasing GO content was due to a reduction in diffusivity. The pure-gas selectivity of the nanocomposite was controlled by diffusivity selectivity, and both increased with increasing GO content. Based on Meares’ formula, correlations between diffusivity and the square of the kinetic diameter were observed for the nanocomposites. The slopes of these correlations increased progressively as a function of GO content, indicating the enhanced size-sieving ability of the nanocomposites.</p>