High-rate nanofluidic energy absorption in porous zeolitic frameworks

sven — Thu, 22 Apr 2021 19:37:50 +0000

Y. Sun, S.M.J. Rogge, A. Lamaire, S. Vandenbrande, J. Wieme, C.R. Siviour, V. Van Speybroeck, J.-C. Tan

Nature Materials

20 (7), 1015–1023

2021

Abstract

Optimal mechanical impact absorbers are reusable and exhibit high specific energy absorption. The forced intrusion of liquid water in hydrophobic nanoporous materials, such as zeolitic imidazolate frameworks (ZIFs), presents an attractive pathway to engineer such systems. However, to harness their full potential, it is crucial to understand the underlying water intrusion and extrusion mechanisms under realistic, high-rate deformation conditions. Here, we report a critical increase of the energy absorption capacity of confined water-ZIF systems at elevated strain rates. Starting from ZIF-8 as proof-of-concept, we demonstrate that this attractive rate dependence is generally applicable to cage-type ZIFs but disappears for channel-containing zeolites. Molecular simulations reveal that this phenomenon originates from the intrinsic nanosecond timescale needed for critical-sized water clusters to nucleate inside the nanocages, expediting water transport through the framework. Harnessing this fundamental understanding, design rules are formulated to construct effective, tailorable and reusable impact energy absorbers for challenging new applications.

DOI

http://dx.doi.org/10.1038/s41563-021-00977-6

Private attachment

s41563-021-00977-6.pdf

Harder, better, faster, stronger: Designing hydrophobic cage-type materials as efficient high-rate shock absorbers

sven — Fri, 17 Sep 2021 09:07:33 +0000

S.M.J. Rogge, Y. Sun, A. Lamaire, S. Vandenbrande, J. Wieme, C.R. Siviour, J.-C. Tan, V. Van Speybroeck

ISBN/ISSN:

Talk

Conference / event / venue

EuroMOF2021

Online

Wednesday, 15 September, 2021

Conference reference