Exfoliation of Graphite to Graphene by Interface Stabilization

    公开(公告)号:US20230257271A1

    公开(公告)日:2023-08-17

    申请号:US17674389

    申请日:2022-02-17

    CPC classification number: C01B32/19 C03C25/44 C03C2218/328

    Abstract: Systems and methods are provided that may utilize a glass substrate to selectively withdraw exfoliated graphene from a high-energy interface between immiscible solvents. The exfoliated graphene preferentially adheres to the surface of the glass substrate for withdrawal from the noted high energy interface, leaving behind the graphite (which is too large to be effectively adsorbed relative to the glass substrate). The disclosed systems and methods are easily implemented and offer significant advantages for graphene production relative to conventional systems and methods, e.g., the disclosed systems/methods do not require the input of heat or mechanical energy which translates to processes that are both cheaper to run and do not result in damage to the graphene. Still further, the disclosed systems/methods do not require chemical modification of the graphene, again lowering the cost considerably and not damaging the graphene structure.

    Two-Dimensional Sheet Stabilized Emulsion Based Inks

    公开(公告)号:US20230235186A1

    公开(公告)日:2023-07-27

    申请号:US18102389

    申请日:2023-01-27

    Abstract: The present disclosure provides advantageous sheet stabilized emulsion based inks, and improved methods for fabricating and using such inks. More particularly, the present disclosure provides improved methods for fabricating conductive inks derived from water-in-oil emulsions stabilized by sheets exfoliated from layered materials (e.g., substantially pristine and non-oxidized graphite or hexagonal boron nitride), and related methods of use. A layered material (e.g., substantially pristine and non-oxidized graphite or hexagonal boron nitride) can be exfoliated into individual sheets, and these sheets can be utilized to stabilize water-in-oil emulsions. In certain embodiments, by utilizing long chain alkanes (e.g., hexadecane), one can advantageously fabricate emulsions with high viscosity and stability. In this form, the emulsions can be used as inks, thereby advantageously providing an inexpensive route to printing electrically conducting and/or insulating lines and shapes.

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