skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Understanding the breathing phenomena in nano-ZIF-7 upon gas adsorption

Abstract

For this research, synchrotron X-ray diffraction and inelastic neutron scattering measurements have been applied to evaluate the breathing phenomena in small nanocrystals of ZIF-7 upon gas adsorption. The experimental results show that an extended solvent exchange process with methanol is crucial to get a solvent-free narrow pore structure. Under these conditions, nano-ZIF-7 is indeed able to adsorb N 2 with a total BET surface area of around 380 m 2 g -1, in close agreement with theoretical predictions. The breathing phenomenon upon nitrogen adsorption is accompanied by a phase-to-phase transition, from a narrow-pore (phase II) to a large-pore (phase I) structure and a suppression of the cooperative deformation of the framework involving mainly the flapping motion of the benzimidazolate (bIm) ligand with the 4- and 6-membered rings. Whereas nitrogen requires temperature and pressure conditions close to condensation (close to 1 bar and 77 K) to induce the breathing in ZIF-7, CO 2 can do it under milder conditions (at room temperature and low relative pressures). These results reflect that the nature of the adsorptive probe and the gas–framework interactions, rather than the molecular diameter and/or shape, play a crucial role in defining the pressure and temperature conditions required to inducemore » the breathing. Lastly, the presence of two different cavities in ZIF-7 as suggested by theoretical predictions, one with a window diameter of below 0.4 nm (cavity A) and the other with a pore size of around 0.6 nm (cavity B), has been confirmed experimentally using immersion calorimetry.« less

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [3];  [3]; ORCiD logo [3]; ORCiD logo [1]
  1. Universidad de Alicante (Spain). Laboratorio de Materiales Avanzados, Departamento de Quimica Inorganica, Instituto Universitario de Materiales
  2. CELLS-ALBA Synchrotron, Barcelona (Spain)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1422567
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 5; Journal Issue: 39; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Cuadrado-Collados, Carlos, Fernández-Català, Javier, Fauth, François, Cheng, Yongqiang Q., Daemen, Luke L., Ramirez-Cuesta, Anibal J., and Silvestre-Albero, Joaquín. Understanding the breathing phenomena in nano-ZIF-7 upon gas adsorption. United States: N. p., 2017. Web. doi:10.1039/C7TA05922A.
Cuadrado-Collados, Carlos, Fernández-Català, Javier, Fauth, François, Cheng, Yongqiang Q., Daemen, Luke L., Ramirez-Cuesta, Anibal J., & Silvestre-Albero, Joaquín. Understanding the breathing phenomena in nano-ZIF-7 upon gas adsorption. United States. doi:10.1039/C7TA05922A.
Cuadrado-Collados, Carlos, Fernández-Català, Javier, Fauth, François, Cheng, Yongqiang Q., Daemen, Luke L., Ramirez-Cuesta, Anibal J., and Silvestre-Albero, Joaquín. Mon . "Understanding the breathing phenomena in nano-ZIF-7 upon gas adsorption". United States. doi:10.1039/C7TA05922A.
@article{osti_1422567,
title = {Understanding the breathing phenomena in nano-ZIF-7 upon gas adsorption},
author = {Cuadrado-Collados, Carlos and Fernández-Català, Javier and Fauth, François and Cheng, Yongqiang Q. and Daemen, Luke L. and Ramirez-Cuesta, Anibal J. and Silvestre-Albero, Joaquín},
abstractNote = {For this research, synchrotron X-ray diffraction and inelastic neutron scattering measurements have been applied to evaluate the breathing phenomena in small nanocrystals of ZIF-7 upon gas adsorption. The experimental results show that an extended solvent exchange process with methanol is crucial to get a solvent-free narrow pore structure. Under these conditions, nano-ZIF-7 is indeed able to adsorb N2 with a total BET surface area of around 380 m2 g-1, in close agreement with theoretical predictions. The breathing phenomenon upon nitrogen adsorption is accompanied by a phase-to-phase transition, from a narrow-pore (phase II) to a large-pore (phase I) structure and a suppression of the cooperative deformation of the framework involving mainly the flapping motion of the benzimidazolate (bIm) ligand with the 4- and 6-membered rings. Whereas nitrogen requires temperature and pressure conditions close to condensation (close to 1 bar and 77 K) to induce the breathing in ZIF-7, CO2 can do it under milder conditions (at room temperature and low relative pressures). These results reflect that the nature of the adsorptive probe and the gas–framework interactions, rather than the molecular diameter and/or shape, play a crucial role in defining the pressure and temperature conditions required to induce the breathing. Lastly, the presence of two different cavities in ZIF-7 as suggested by theoretical predictions, one with a window diameter of below 0.4 nm (cavity A) and the other with a pore size of around 0.6 nm (cavity B), has been confirmed experimentally using immersion calorimetry.},
doi = {10.1039/C7TA05922A},
journal = {Journal of Materials Chemistry. A},
number = 39,
volume = 5,
place = {United States},
year = {Mon Sep 11 00:00:00 EDT 2017},
month = {Mon Sep 11 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on September 11, 2018
Publisher's Version of Record

Save / Share: