US Patent No. 10,602,646


Patent No. 10,602,646
Issue Date March 24, 2020
Title Method For Preparing Magnetic Iron Oxide-graphene Composite
Inventorship Se Ho Park, Daejeon (KR)
Kwon Nam Sohn, Daejeon (KR)
Won Jong Kwon, Daejeon (KR)
Seung Bo Yang, Daejeon (KR)
Assignee LG Chem, Ltd., (KR)

Claim of US Patent No. 10,602,646

1. A method for preparing a magnetic iron oxide-graphene composite comprising the steps of:mixing graphite and a halogen salt of iron and heat-treating the same (Step 1);
reacting the product of step 1 with a (C1-20 alkyl) amine (Step 2);
washing the product of step 2 (Step 3);
subjecting the product of step 3 to a high-speed homogenization (Step 4); and
subjecting the product of step 4 to sonication or a high-pressure homogenization (Step 5),
wherein the high-speed homogenization of step 4 is carried out by stirring the product of Step 2 at 5000 to 8000 rpm,
wherein the high-pressure homogenization of step 5 is carried out by passing the product of step 4 through a high-pressure homogenizer including an inlet, an outlet, and a micro-channel that connects between the inlet and the outlet and has a diameter in a micrometer scale,
wherein the product of step 4 is introduced to the inlet of the high-pressure homogenizer under application of a pressure of 500 to 3000 bar and passes through the micro-channel.