Method of preparing hierarchically porous polymers and hierarchically porous polymers prepared thereby

    公开(公告)号:US11180626B2

    公开(公告)日:2021-11-23

    申请号:US16190352

    申请日:2018-11-14

    Abstract: The present invention relates to a method of preparing a hierarchically porous polymer and a hierarchically porous polymer prepared thereby. The method comprises the steps of: (a) polymerizing an external oil phase of a high internal phase emulsion (HIPE) consisting aqueous droplets to produce a cross-linked block copolymer; (b) obtaining a macroporous polymer with interconnected macropores by removing the aqueous droplets; and (c) treating the obtained porous polymer with a base, thereby obtaining a hierarchically porous polymer having three-dimensional mesopores formed in the macroporous walls. According to the method, the macropore size and mesopore size of the hierarchically porous polymer can all be controlled. The hierarchically porous polymer prepared by the method can easily separate polymers having different sizes, and thus is highly useful in the polymer separation field.

    Heterogeneously integrated photonic circuit and method for manufacturing the circuit

    公开(公告)号:US11169327B2

    公开(公告)日:2021-11-09

    申请号:US16984808

    申请日:2020-08-04

    Abstract: The method for manufacturing the heterojunction circuit according to one embodiment of the present disclosure comprises depositing a first electrode on at least a part of a waveguide, moving a semiconductor comprising a second electrode at a lower end thereof onto the first electrode, and depositing a third electrode on an upper end of the semiconductor, wherein the waveguide and the semiconductor comprise different materials. Additionally, the moving step further comprises generating microbubbles by supplying heat to at least a part of the semiconductor, moving the semiconductor on the first electrode by moving the generated microbubbles, and removing the microbubbles by positioning the semiconductor on the first electrode.

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