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The static observation about the O-mMWNT-PEG suspension liquid and the effect caused by magnet attraction. The O-mMWNT-PEG suspension liquid placed for 1 week (a1); the O-mMWNT-PEG suspension liquid placed for 2 weeks (a2); the O-mMWNT-PEG suspension liquid placed for 1 month (a3). Picture B indicates that O-mMWNT-PEG gathered quickly (within 1 min) on the side where the magnet was placed.
