Zhenjie He

TL;DR: It is discovered that physical dispersion of nonporous, nanoscale, fumed silica particles in glassy amorphous poly(4-methyl-2-pentyne) simultaneously and surprisingly enhances both membrane permeability and selectivity for large organic molecules over small permanent gases.

TL;DR: In contrast to the performance of traditional filled polymer systems, penetrant permeability coefficients in high-free-volume, glassy poly(4-methyl-2-pentyne) (PMP) increase systematically and substantially with increasing concentration of nonporous, nanoscale fumed silica (FS) as discussed by the authors.

TL;DR: Penetrant diffusion coefficients in poly(1-trimethylsilyl-1-propyne) [PTMSP] increase systematically with increasing concentration of nonporous, nanoscale fumed silica.

TL;DR: In this paper, the authors determined the gas permeability of polydimethylsiloxane (PDMS) films over a temperature range of 35 to −20°C for pure gases and a series of binary n -butane/methane and multicomponent hydrocarbon/hydrogen mixtures.

TL;DR: In this paper, the authors describe the development of selective membranes to treat natural gas containing high concentrations of nitrogen, and show that methane-selective membranes are generally preferable and membranes with high permeances and methane/nitrogen selectivities of approximately 3.5 were developed.