Acetone is a solvent that breaks down Styrofoam, which results in the Styrofoam dissolving in Acetone similar to how sugar does in water. Styrofoam is a polystyrene that has been pumped with air.
Caption Schematic illustration showing the fabrication process of the CNT/BST foam with various shapes. Effects of the BST content and annealing temperature on TE properties of the CNT/BST foams.
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