Browsing by Author "Shang, Yuanyuan"

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    Carbon Additive Manufacturing with a Near-Replica “Green-to-Brown” Transformation
    (Advanced Materials, 2023-05-30) Zhang, Chunyan; Shi, Baohui; He, Jinlong; Zhou, Lyu; Park, Soyeon; Doshi, Sagar; Shang, Yuanyuan; Deng, Kaiyue; Giordano, Marc; Qi, Xiangjun; Cui, Shuang; Liu, Ling; Ni, Chaoying; Fu, Kun Kelvin
    Nanocomposites containing nanoscale materials offer exciting opportunities to encode nanoscale features into macroscale dimensions, which produces unprecedented impact in material design and application. However, conventional methods cannot process nanocomposites with a high particle loading, as well as nanocomposites with the ability to be tailored at multiple scales. A composite architected mesoscale process strategy that brings particle loading nanoscale materials combined with multiscale features including nanoscale manipulation, mesoscale architecture, and macroscale formation to create spatially programmed nanocomposites with high particle loading and multiscale tailorability is reported. The process features a low-shrinking (<10%) “green-to-brown” transformation, making a near-geometric replica of the 3D design to produce a “brown” part with full nanomaterials to allow further matrix infill. This demonstration includes additively manufactured carbon nanocomposites containing carbon nanotubes (CNTs) and thermoset epoxy, leading to multiscale CNTs tailorability, performance improvement, and 3D complex geometry feasibility. The process can produce nanomaterial-assembled architectures with 3D geometry and multiscale features and can incorporate a wide range of matrix materials, such as polymers, metals, and ceramics, to fabricate nanocomposites for new device structures and applications.
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    Universal Carbonizable Filaments for 3D Printing
    (Advanced Functional Materials, 2024-06-23) Park, Soyeon; Shi, Baohui; Islam, Md Mohaiminul; He, Jinlong; Sung, Dae Han; Zhang, Chunyan; Cao, Zhang; Shang, Yuanyuan; Liu, Ling; Fu, Kelvin
    Carbon additive manufacturing emerges as a powerful technique for crafting tunable 3D carbon architectures, employing multiscale arrangement and topological design for mechanical and functional applications. However, the potential of 3D carbon fabrication is constrained when utilizing state-of-the-art feedstock and manufacturing routes. To address these limitations, a 3D carbon fabrication strategy is developed named carbonizable filament technology (CAFIT). In CAFIT, the evolution of high-loaded carbon composite filaments broadens the capabilities of straightforward 3D printing technology by ensuring structural stability for subsequent post-carbonization to achieve scalable and engineered 3D carbon structures. This strategy has strengths regarding 1) simplicity, 2) applicability to a variety of carbon materials, and 3) creating nearly replicated 3D carbon structures with multiscale features. The fundamental mechanisms governing the processability of the universal filament and structural change of carbon particles throughout the process using carbon nanotubes as an example are explored. Moreover, through simulation and demonstration, the adaptability of CAFIT is illustrated by utilizing a wide range of carbon materials, including low-dimensional nano/micro carbons (carbon blacks, carbon nanotubes, and graphenes), as well as carbon fibers, to fabricate 3D architected carbon structures.