| Autor: |
Zhou X; Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States., Miao YR; Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States., Shaw WL; Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States., Suslick KS; Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States., Dlott DD; Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States. |
| Abstrakt: |
Recent investigations into the mechanical properties and mechanochemical reactions of metal-organic frameworks (MOFs) have suggested the potential for energy dissipation by multiple mechanisms. Although the possibility of efficient multifunctional shock dissipation by MOFs was suggested by static high pressure studies, there is little known about MOFs under shock compression. Here, we measure the attenuation of shock wave by the MOF denoted zeolitic-imidazolate framework (ZIF-8) in its desolvated, porous state. We find that shock wave dissipation by ZIF-8 occurred by multiple processes: powder compaction, nanopore-collapse, and chemical bond-breakage. The shock energy absorbance in ZIF-8 is proportional to ZIF-8 thickness, allowing the prediction of the thickness of MOF layer needed to attenuate shock waves to a desired lower energy. Compared with PMMA, often used as a standard, ZIF-8 attenuates 7 times more shock energy per unit mass for impacts at a lower velocity of 0.75 km/s and 2.5 times more at a higher velocity of 1.6 km/s. This research illustrates how to improve the ability to attenuate shock waves for personnel and equipment protection by engineering multifunctionality into the shock wave absorbing armor material. |
