Journal
SCIENCE ADVANCES
Volume 1, Issue 11, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1500849
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Funding
- Mechanical Behavior of Materials Program at the Lawrence Berkeley National Laboratory - Materials Sciences and Engineering Division, Office of Basic Energy Sciences, Office of Science
- U. S. Department of Energy (DOE) [DE-AC02-05CH11231]
- x-ray tomography Beamline at the Advanced Light Source at Lawrence Berkeley National Laboratory [8.3.2]
- DOE's Office of Basic Energy Sciences
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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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