04-07-2019 дата публикации
Номер: US20190206598A1
Described herein is a magnetic particle, which includes a knobby copolymer core, a polymer layer, a magnetic substance layer and a silicon-based layer. The polymer layer covers the knobby copolymer core and has at least one functional group. In addition, the magnetic substance layer covers the polymer layer and the silicon-based layer covers the magnetic substance layer. Furthermore, a manufacturing method of the magnetic particle is also described. 1. A magnetic particle , comprising:a knobby copolymer core;a polymer layer, covering the knobby copolymer core and having at least one functional group;a magnetic substance layer, covering the polymer layer; anda silicon-based layer, covering the magnetic substance layer.2. The magnetic particle of claim 1 , wherein an average diameter of the magnetic particle is 1 μm to 50 μm.3. The magnetic particle of claim 1 , wherein the knobby copolymer core comprises a plurality of protrusions and an average height of the plurality of protrusions is 100 nm to 5000 nm.4. The magnetic particle of claim 1 , wherein the knobby copolymer core comprises a copolymer obtained by copolymerizing a monofunctional monomer and a bifunctional monomer.5. The magnetic particle of claim 4 , wherein a volume percentage of the bifunctional monomer relative to the monofunctional monomer is 0.4% to 2%.6. The magnetic particle of claim 1 , wherein the knobby copolymer core comprises a styrene/divinylbenzene copolymer claim 1 , a methyl methacrylate/triethylene glycol dimethacrylate copolymer claim 1 , a methyl methacrylate/ethylene glycol dimethacrylate copolymer claim 1 , a styrene/triethylene glycol dimethacrylate copolymer claim 1 , a styrene/ethylene glycol dimethacrylate copolymer claim 1 , or a methyl methacrylate/divinylbenzene copolymer.7. The magnetic particle of claim 1 , wherein the at least one functional group is charged.8. The magnetic particle of claim 1 , wherein the at least one functional group comprises a carboxyl group claim 1 , an ...
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