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公开(公告)号：US20210269664A1
公开(公告)日：2021-09-02
申请号：US17173268
申请日：2021-02-11
Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Chong Min KOO , In Sik IN , Tae Yun KO , Daesin KIM , Se Hyun DOO , Seon Joon KIM , Soon Man HONG , Seung Sang HWANG , Kyung Youl BAEK , Albert LEE , Sangho CHO
IPC: C09D11/52 , C09D11/037 , C09D11/033 , C07F7/28 , C07F11/00 , C07F9/00 , H01B1/20
Abstract: The present disclosure relates to 2-dimensional MXenes surface-modified with catechol derivatives, a method for preparing the same, MXene organic ink including the same, and use thereof (e.g. flexible electrodes, conducive cohesive/adhesive materials, electromagnetic wave-shielding materials, flexible heaters, sensors, energy storage devices). Particularly, the simple, fast, and scalable surface-functionalization process of MXenes using catechol derivatives (e.g. ADOPA) organic ligands significantly improves the dispersion stability in various organic solvents (including ethanol, isopropyl alcohol, acetone and acetonitrile) and produces highly concentrated organic liquid crystals of various MXenes (including Ti2CTx, Nb2CTx, V2CTx, Mo2CTx, Ti3C2Tx, Ti3CNTx, Mo2TiC2Tx, and Mo2Ti2C3Tx). Such products offer excellent electrical conductivity, improved oxidation stability, excellent coating and adhesion abilities to various hydrophobic substrates, and composite processability with hydrophobic polymers. This finding will lead to further studies on the structures, properties, and physics of the organic MXene liquid crystals and their practical applications.
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公开(公告)号：US20210261415A1
公开(公告)日：2021-08-26
申请号：US17179332
申请日：2021-02-18
Inventor： Yury GOGOTSI , Kanit HANTANASIRISAKUL , Chong Min KOO , Aamir IQBAL , Soon Man HONG , Seon Joon KIM , Seung Sang HWANG , Kyung Youl BAEK , Albert LEE , Sangho CHO
IPC: C01B21/082 , H05K9/00
Abstract: In an aspect, the present disclosure provides a heat-treated transition metal carbonitride MXene film annealed at high temperatures and a polymer composite comprising the same. In another aspect, the present disclosure provides a method for producing a heat-treated transition metal carbonitride MXene film comprising: obtaining a MXene aqueous solution containing dispersed 2-dimensional (2D) MXenes through an acid etching process; filtering the obtained MXene aqueous solution through a vacuum filtration process to produce a free-standing film; and annealing the produced free-standing film at high temperatures to obtain a heat-treated transition metal carbonitride MXene film. In still another aspect, the present disclosure provides an electromagnetic interference (EMI) shielding method comprising: superposing a coating comprising a heat-treated transition metal carbonitride MXene film on at least one surface of an object in a contact or non-contact manner.
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13.发明申请公开(公告)号：US20190016868A1
公开(公告)日：2019-01-17
申请号：US15990690
申请日：2018-05-28
Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
Inventor： Chong Min KOO , Soon Man HONG , Seung Sang HWANG , Kyung Youl BAEK , Hyunchul PARK , Seunggun YU , Hyesung CHO
Abstract: A method of preparing a polymer hollow particle, a low-specific gravity and monodispersed polymer hollow particle of various shapes prepared using the method, and a composite including the polymer hollow particle are provided. The method includes: a first step of providing, onto a substrate including a engraved pattern, at least one expandable particle comprising a foaming agent-containing expandable core and a thermoplastic polymer shell; a second step of removing an excess of the at least one expandable particle from a resulting product of the first step; a third step of expanding the at least one expandable particle in the engraved pattern of the substrate by thermally treating a resulting product of the second step; and a fourth step of separating, from the substrate, expanded hollow polymer particles which are a resulting product of the third step.
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