미래를 창조하는 포스텍 화학공학과
주제: Strategies for Assembling 2D Nanomaterials into Functional Structures
내용: The range of applications of graphene-based assembled materials can be expanded by modification of the mechanical traits of these materials. The mechanical properties of a material can be modified through structure control. For example, tailoring the inner structures of graphene foams and films yields materials with diverse mechanical traits and varied applications. Graphene fibers, the latest emerging class of graphene-based assembled materials, have been widely researched in the areas such as wearable electronic/energy applications owing to their unique properties and flexibility. In this talk, first, I will introduce the reconstruction strategies of 2-dimensional (2D) nanomaterials into functional materials. Graphene oxide (GO) sheets can assemble into 1-dimensional (1D) fibers through the structural control manner via a large-scale wet-spinning assembly. In particular, our straightforward and continuous wet-spinning strategy is beneficial to fabricate multiscale dimensional fibers with high electroconductivity, flexibility, and mechanical strength. Second, two allotropes of carbon nanomaterials that can be assembled into high torsional strength fibers through rheological control will be introduced. Two distinctive building blocks, including GO and CNTs, are wet-spun in a coagulation bath to form hybrid fibers with highly oriented inner structures. CNTs and GO interact with each other and direct the structural manipulation. Finally, to conclude, I will introduce a deformable Ti3C2Tx MXene gel of well-defined multiscale structures prepared by self-assembly of 2D sheets. By taking advantage of strong molecular interactions, mechanically strong fibers can be fabricated by drawing the MXene gel. Due to its defect-free structure, Ti3C2Tx MXene fiber has dense lamella and a highly aligned multiscale structure. Like electrical wire, Ti3C2Tx MXene fibers exhibit outstanding electrical conductivity and a high mechanical modulus compared with other MXene-based assemblies.
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회의 ID: 382 631 3167