lab12-disc - Experiment 12 Magnetic Properties of Inorganic...

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Experiment 12: Magnetic Properties of Inorganic Compounds Name: Fletcher Dostie Experiment Performed: 4/6/09 Turned in: 4/15/09 “I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community.”
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(1) A spinel structure is a crystal structure with oxide ions arranged in a cubic close- packed configuration and other atoms occupying the tetrahedral and octahedral holes in the crystal. Magnetite is an example of a crystal with a spinel structure. In this case, Fe 2+ ions occupy the tetrahedral holes and Fe 3+ ions occupy the octahedral holes. (2) The surfactant used in preparing the ferrofluid was citric acid. The purpose of this compound was to prevent the magnetite nanoparticles in the fluid from aggregating. Citric acid worked as a surfactant by ligating with iron atoms in the fluid. By binding to the surface of the nanoparticles, the citric acid prevented the particles from coming into contact with one another and aggregating into crystals.
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