Nanodomain Control in Carbon Molecular Sieve Membranes via Nanomaterial Footprinting

Author:

Hardian Rifan1ORCID,Abdulhamid Mahmoud. A.1,Szekely Gyorgy12ORCID

Affiliation:

1. Advanced Membranes and Porous Materials Center Physical Science and Engineering Division (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

2. Chemical Engineering Program Physical Science and Engineering Division (PSE) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

Abstract

Carbon molecular sieve (CMS) membranes, fabricated via pyrolysis, are attracting attention owing to their stability under harsh environments, including high temperatures, organic media, and extreme pH. Herein, the fabrication of composite CMS (CCMS) membranes by incorporating sphere‐shaped C60(OH) and ellipsoid‐shaped C70(OH) fullerenol nanomaterials into intrinsically microporous 4,4′‐(hexafluoroisopropylidene) diphthalic anhydride 3,3′‐dimethyl‐naphthidine polyimide is reported. The encapsulation of the nanomaterials by the polymer matrix, their chemical footprint, and the variation in the local chemistry of the pyrolyzed membranes are successfully revealed via nanodomain analysis using nano‐Fourier‐transform infrared spectroscopy. The incorporation of fullerenol nanomaterials into CMS membranes can induce the formation of fractional free volume upon pyrolysis, which can translate into molecular sieving enhancement. The effects of the concentration and geometrical shape of the fullerenol nanomaterials are successfully correlated with the membrane separation performance. The CCMS membranes demonstrate excellent stability and pharmaceutical and dye separation performance in organic media. Herein, nanodomain control is pioneered in CCMS membranes via nanomaterial footprinting to induce porosity during pyrolysis and subsequent control molecular sieving performance.

Funder

Global Collaborative Research, King Abdullah University of Science and Technology

Publisher

Wiley

Subject

General Earth and Planetary Sciences,General Environmental Science

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