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First, the Sylgard monomer PDMS 184 and the curing agent were mixed in a 1:10 ratio. This PDMS prepolymer was coated on the steel capillary with an outer diameter of 2 mm and kept in vertical direction at room temperature for 6 min, followed by thermal curing at 60°C for 20 min. Second, carbonyl iron powder (<10 μm) was added to the PDMS prepolymer with vigorous stirring to form a mixture containing 70% iron powder. The compound was coated on clean glass slide using the tape-casting method, and the as-prepared film thickness was ~100 μm. Then, the previously obtained PDMS tube was carefully placed on the iron-doped PDMS prepolymer film, followed by secondary thermal curing at 80°C for 1 hour. Last, the whole tube was swelled in the hexane, the PDMS tube was quickly peeled off, and then the MTMAs were obtained.

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