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               Printing with light: Additive Micro/Nano Manufacturing and Multi-functional 3D Architected 

               Metamaterials by Design

报 告 人 :郑小雨教授




郑教授课题组所开展的研究领域是微纳米3D制造技术和超材料设计与制造 . 着重于实现传统制造无法成型的材料,从而实现逆向设计出的超清多功能材料。 他研究的微型晶格纳米架构材料及光学3D打印制造技术,在《麻省理工学院技术评论》评选的2015年十项可能改变世界的技术之一。其主创的3D光学打印及微纳米超材料工作先后于第一兼第一通讯作者刊登于 2014《科学》及 2016《自然 材料》杂志封面;郑小雨荣获多项奖项,包括2018年美国空军科学研究部年轻教授奖,ICTAS 年轻教授奖,弗吉尼亚理工发明奖,IEEE Sensors 最佳论文奖,劳伦斯国家lol竞猜最佳论文奖,优秀博士论文奖。

讲座摘要 :

Material properties are governed by their chemical composition and spatial arrangement of constituent elements at multiple length-scales. This fundamentally limits material properties with respect to each other creating trade-offs when selecting materials for specific applications. For example, few solid materials exist considerably lighter than water.  To decrease the density beyond this point, materials must have a porosity, which comes at the cost of a disproportional degradation of other desirable properties.

We create materials with combinations of previously unachievable properties: 3D architected metamaterials. These materials are as light as carbon aerogels, but with orders of magnitude higher stiffness and strength.  They utilize interconnected 3D hierarchical micro-structures, rather than relying on chemistry alone, to greatly expand the performance of a material. I will discuss a suite of scalable additive micro- and nano manufacturing technologies to enable fast manufacture of these ultralight metamaterials in polymer, metals, ceramics and nanocomposites. Attention is focused on how rapid prototyping techniques are being evolved into a suite of novel manufacturing processes capable of creating traditionally unprocessable material building blocks, and proliferating them into scalable, macroscopic dimensions with hierarchical 3D features spanning from tens of nanometers, to micrometers, centimeters and above. Next, we examine the potential to introduce designed-in attributes from disparate physical property space into metamaterials. These attributes include lightweight, flexibility, fracture resistant, high temperature resistant, sensing and actuation, which could transform our ability to tailor new properties and functions out of a single artificial material building block, rather than relying on multiple components.    

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