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Related Experiment Video

Updated: Oct 10, 2025

Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route

Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route

Published on: April 3, 2016

Water Capture Mechanisms at Zeolitic Imidazolate Framework Interfaces.

Jackson C Wagner¹, Kelly M Hunter¹, Francesco Paesani^1,2

¹Department of Chemistry and Biochemistry, University of California, San Diego, California 92093, United States.

Journal of the American Chemical Society

|December 8, 2021

Summary

Zeolitic imidazolate framework ZIF-90 captures water by simultaneous pore filling and clustering, followed by sequential filling of other pores. This mechanism, driven by hydrogen bond strength, is key for optimizing water harvesting materials.

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Last Updated: Oct 10, 2025

Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route

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Published on: April 3, 2016

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination

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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

Area of Science:

Materials Science
Physical Chemistry
Spectroscopy

Background:

Zeolitic imidazolate frameworks (ZIFs) are promising for gas storage and separation.
Understanding water interactions within ZIFs is crucial for applications like water harvesting.
ZIF-90 is a specific ZIF with potential for selective water adsorption.

Purpose of the Study:

To elucidate the detailed water capture mechanism in ZIF-90 at a molecular level.
To differentiate between water clustering and pore filling processes.
To investigate the role of hydrogen bonding in water uptake.

Main Methods:

Vibrational sum-frequency generation spectroscopy (VSFG) with one-micron spatial resolution.
State-of-the-art molecular dynamics (MD) simulations using the MB-pol water model.
Comparison of VSFG and IR spectra, and analysis of relative humidity dependence.

Main Results:

Water clustering and center pore filling occur nearly simultaneously within ZIF-90 pores.
Other pores are filled sequentially after initial pore occupation.
The relative strength of hydrogen bonds dictates the water uptake mechanism.

Conclusions:

The study provides critical mechanistic insights into ZIF-90 pore filling.
Integration of nonlinear optics and MD simulations offers a powerful approach for studying such systems.
Findings can guide the rational design of metal-organic frameworks for enhanced water harvesting.