TY - JOUR
T1 - Rapid Quantification of Mass Transfer Barriers in Metal-Organic Framework Crystals
AU - Son, Florencia A.
AU - Bukowski, Brandon C.
AU - Islamoglu, Timur
AU - Snurr, Randall Q.
AU - Farha, Omar K.
N1 - Funding Information:
The authors gratefully acknowledge support from the Defense Threat Reduction Agency (HDTRA1-19-1-0007). This work made use of the IMSERC X-RAY facility at Northwestern University, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-2025633), and Northwestern University. This work also made use of the EPIC facility of Northwestern University’s NU Center, which has received support from the SHyNE Resource (NSF ECCS-2025633), the IIN, and Northwestern’s MRSEC program (NSF DMR-1720139). F.A.S. is supported by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate (NDSEG) Fellowship Program. F.A.S. also gratefully acknowledges support from the Ryan Fellowship and the International Institute for Nanotechnology at Northwestern University.
Publisher Copyright:
©
PY - 2021/12/14
Y1 - 2021/12/14
N2 - Although mass transfer of molecules in and out of porous materials such as zeolites and metal-organic frameworks impacts many applications, the fast and reproducible measurement of intracrystalline diffusion and surface permeability in porous materials remains challenging. Here, we demonstrate how a commercially available volumetric adsorption instrument can be used to reliably obtain guest mass transfer rates in nanoporous materials. The measurements are rapid and allow for the determination of intracrystalline diffusion coefficients and surface permeabilities in multiple adsorbents simultaneously, as well as the parallel collection of their adsorptive properties. In addition to describing the experimental procedures in detail, we provide a user-friendly code to facilitate the data analysis to obtain the transport parameters from adsorption uptake experiments and to determine the rate limiting process. Using the metal-organic frameworks MOF-808, NU-1000, and UiO-66, we illustrate the reproducibility of this technique for different sample masses across a variety of pressures. Wider adoption of this method─using commonly available equipment─should contribute to a better understanding of mass transport in nanoporous materials.
AB - Although mass transfer of molecules in and out of porous materials such as zeolites and metal-organic frameworks impacts many applications, the fast and reproducible measurement of intracrystalline diffusion and surface permeability in porous materials remains challenging. Here, we demonstrate how a commercially available volumetric adsorption instrument can be used to reliably obtain guest mass transfer rates in nanoporous materials. The measurements are rapid and allow for the determination of intracrystalline diffusion coefficients and surface permeabilities in multiple adsorbents simultaneously, as well as the parallel collection of their adsorptive properties. In addition to describing the experimental procedures in detail, we provide a user-friendly code to facilitate the data analysis to obtain the transport parameters from adsorption uptake experiments and to determine the rate limiting process. Using the metal-organic frameworks MOF-808, NU-1000, and UiO-66, we illustrate the reproducibility of this technique for different sample masses across a variety of pressures. Wider adoption of this method─using commonly available equipment─should contribute to a better understanding of mass transport in nanoporous materials.
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U2 - 10.1021/acs.chemmater.1c02462
DO - 10.1021/acs.chemmater.1c02462
M3 - Article
AN - SCOPUS:85120650220
SN - 0897-4756
VL - 33
SP - 9093
EP - 9100
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 23
ER -