聚二甲基硅氧烷
多孔性
成核
制作
材料科学
层状结构
纳米技术
多孔介质
陶瓷
复合材料
医学
病理
有机化学
化学
替代医学
作者
Hao Bai,Yuan Chen,Benjamin Delattre,Antoni P. Tomsia,Robert O. Ritchie
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2015-12-04
卷期号:1 (11)
被引量:356
标识
DOI:10.1126/sciadv.1500849
摘要
Natural materials, such as bone, teeth, shells, and wood, exhibit outstanding properties despite being porous and made of weak constituents. Frequently, they represent a source of inspiration to design strong, tough, and lightweight materials. Although many techniques have been introduced to create such structures, a long-range order of the porosity as well as a precise control of the final architecture remain difficult to achieve. These limitations severely hinder the scale-up fabrication of layered structures aimed for larger applications. We report on a bidirectional freezing technique to successfully assemble ceramic particles into scaffolds with large-scale aligned, lamellar, porous, nacre-like structure and long-range order at the centimeter scale. This is achieved by modifying the cold finger with a polydimethylsiloxane (PDMS) wedge to control the nucleation and growth of ice crystals under dual temperature gradients. Our approach could provide an effective way of manufacturing novel bioinspired structural materials, in particular advanced materials such as composites, where a higher level of control over the structure is required.
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