Seoul National University · Engineering
우용렬 교수 연구실은 나노소재의 설계 및 응용에 중점을 두며, 전기적·전기화학적 성능을 극대화하는 1차원 나노구조물(나노섬유, 양모 등)의 제작 기술을 핵심으로 합니다. 특히 코어-쉘 나노소재, 복합 나노섬유, 휘어진 섬유 기반 피에조전기 소자 및 리튬이on 배터리 음극재 개발을 통해 에너지 저장 및 스마트 소재 분야에서의 응용을 지속적으로 확장하고 있습니다. 고도화된 공정 기술(예: 복합 전기장, 터널링 스피닝)을 기반으로 한 재료의 미세구조 제어와 성능 향상이 주요 연구 방향입니다.
Figures are computed from collected data and may differ slightly.
Electrospinning, a common method for synthesizing 1D nanostructures, has contributed to developments in the electrical, electrochemical, biomedical, and environmental fields. Recently, a coaxial electrospinning process has been used to fabricate new nanostructures with advanced performance, but intricate and delicate process conditions hinder reproducibility and mass production. Herein, recent progress in new emerging parameters for successful coaxial electrospinning, and the various nanostructu
Semi-crystalline shape memory polymers (SMPs) show net two-way shape memory (2W-SM) behavior under constant stresses by the recoverable creep strain upon heating and stress-induced crystallization under the application of creep stress upon cooling. The applied constant stress is the key factor in this 2W-SM behavior. A core/shell structure is manufactured for the purpose of imparting a constant stress upon SMPs. An SMP in film or fiber form is dipped into a solution of an elastomer, photoinitiat
Silicon/carbon (Si/C) nanocomposites have recently received much attention as Li-ion battery negative electrodes due to their mutual synergetic effects in capacity and mechanical integrity. The contribution of Si to the total capacity of the Si/C nanocomposites determines their structural efficiency. Herein, we report on a multi-layered, one-dimensional nanostructure that exhibits the theoretical specific capacity of Si in the nanocomposite. Concentrically tri-layered, compartmentalized, C-core/
This report describes a new twist-spinning process for the manufacture of piezoelectric yarn without the need for additional poling processes. Poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) nanofibers were first electrospun and organized into a web structure. Using rotational and translational motors, the nanofibers of the web were pulled and stretched and, finally, twisted into piezoelectric yarns. The crystallinity, β phase ratio, and mechanical and piezoelectric properties of these t
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