Magnetic liquid marble as well as preparation method and application thereof
A magnetic liquid and marble technology, applied in the field of magnetic liquid marbles and their preparation, can solve the problems of difficult to fully recycle materials, difficult access process, poor mechanical properties, etc., to save time and energy, high utilization rate, The effect of enhancing thermal conductivity
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Embodiment 1
[0032] 0.2 g of γ-Fe with a particle size of 40-80 nm purchased from Aladdin 2 O 3 The nanoparticles were added to 80g of absolute ethanol for ultrasonic dispersion for 0.5h, then 4g of 25% ammonia water and 0.1g of ethyl orthosilicate were added to the solution, mechanically stirred for 3h, and then centrifuged at 3000-3500rpm. Vacuum drying at 60 °C for 3 h to obtain magnetic core γ-Fe 2 O 3 @SiO 2 .
[0033] 0.1g of magnetic core γ-Fe 2 O 3 @SiO 2 , 0.1g of PDMS prepolymer and 0.01g of curing agent were added to 6g of n-hexane, mechanically stirred for 0.5h, the obtained suspension was filtered, and dried at 80°C for 2h to obtain magnetic superhydrophobic powder. In the embodiment of the present invention, the model of polydimethylsiloxane is Dow Corning SYLGARD 184, which is a two-component commodity consisting of PDMS prepolymer and curing agent. The mass ratio of PDMS prepolymer and curing agent in use is 10:1.
[0034] Drop 20, 40, 100, 200, 300, 400, 500 μL of...
Embodiment 2
[0036] 0.2 g of γ-Fe with a particle size of 40-80 nm purchased from Aladdin 2 O 3 The nanoparticles were added to 80g of absolute ethanol for ultrasonic dispersion for 0.5h, then 4g of 25% ammonia water and 0.1g of ethyl orthosilicate were added to the solution, mechanically stirred for 3h, and then centrifuged at 3000-3500rpm. Vacuum drying at 60 °C for 3 h to obtain magnetic core γ-Fe 2O 3 @SiO 2 .
[0037] 0.1g of magnetic core γ-Fe 2 O 3 @SiO 2 , 0.15g of PDMS prepolymer and 0.015g of curing agent were added to 6g of n-hexane, mechanically stirred for 0.5h, the obtained suspension was filtered, and dried at 80°C for 2h to obtain magnetic superhydrophobic powder.
[0038] 100 μL of water droplets were dropped onto the magnetic superhydrophobic powder, and the droplets were rolled until the droplets were completely encapsulated to obtain magnetic liquid marbles. figure 2 It is shown that the prepared magnetic liquid marbles are placed on a glass sheet, and a magnet...
Embodiment 3
[0040] 0.2 g of γ-Fe with a particle size of 40-80 nm purchased from Aladdin 2 O 3 The nanoparticles were added to 80g of absolute ethanol for ultrasonic dispersion for 0.5h, then 4g of 25% ammonia water and 0.1g of ethyl orthosilicate were added to the solution, mechanically stirred for 3h, and then centrifuged at 3000-3500rpm. Vacuum drying at 60 °C for 3 h to obtain magnetic core γ-Fe 2 O 3 @SiO 2 .
[0041] 0.1g of magnetic core γ-Fe 2 O 3 @SiO 2 Add 0.15g of PDMS prepolymer and 0.015g of curing agent to 6g of n-hexane, stir mechanically for 0.5h, filter the obtained suspension, and dry at 80°C for 2h to obtain magnetic superhydrophobic powder.
[0042] Drop 50 μL of 2% silver ammonia solution onto the magnetic superhydrophobic powder, and roll the droplet until the droplet is completely wrapped to obtain magnetic liquid marbles; then open the magnetic liquid marbles by the method described in Example 2, 2 μL of 97% acetaldehyde solution purchased from Aladdin was ...
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