that decreases metallic core particle magnetite Fe 3 O 4 magnetism by 70 when wrapped within a chromiumbased metalorganic framework MOF shell Significance and Impact Offers fundamental knowledge as to how ID: 1023012
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1. Scientific AchievementDiscovered mechanism that decreases metallic core particle (magnetite, Fe3O4) magnetism by 70% when wrapped within a chromium-based metal-organic framework (MOF) shellSignificance and ImpactOffers fundamental knowledge as to how an MOF structure affects the iron core; allows researchers to adjust MOF chemistry to prevent unwanted oxidation-reduction reactions and better retain magnetic propertiesResearch DetailsChromium from the MOF precursor solution penetrated into the pores of the magnetic core; the chromium was reduced by capturing an electron from the magnetite, thus oxidizing it. The magnetic strength of magnetite is strongly determined by the amount of ferrous versus ferric (oxidized) iron in the material. The iron oxidation thus degraded the magnetic properties. Why Magnetism of Metallic Cores Drops in a MOF ShellThe magnetic strength (left) drops when magnetic iron microspheres (black) are wrapped up in a metal-organic framework shell (blue). Work was performed at Pacific Northwest National LaboratorySK Elsaidi, et al. 2017. Nano Letters 17(11):6968. DOI: 10.1021/acs.nanolett.7b03451