Most things can not deform more than 1 percent, and in fact normal ceramic can not even 1 percent b

Ceramics are not known at all as a flexible material; break easily when subjected to pressure. But an international team of scientists has found a solution for that problem, at least in the case of very small objects. This group has devised a way to make tiny ceramic objects that are not only flexible, crops grown in africa but also have "memory" on the way: When heated bend and then return to their original shapes. crops grown in africa The surprising discovery is the work of the team of Alan Lai and Christopher Schuh Massachusetts Institute of Technology (MIT) in Cambridge, USA and Zehui Du and Chee Lip Gan Nanyang Technological University in Singapore. The shape memory materials to deformable and are then able to regain its original shape by themselves, with or without the aid of an external stimulus such as a change of temperature, are known since the 1950s. But so far, all materials in this capacity have been essentially metals and some polymers, ceramics ever. Lai's team managed to develop shape memory ceramics by two key strategies. First, these scientists created ceramic crops grown in africa objects so small that they are invisible to the naked eye. The reason for choosing such a tiny size is that small bodies are more resistant to breakage. When subjected to a load, the molecular structure of the ceramic material studied by the MIT group and Nanyang Technological University deforms rather than break. When heated, recovers crops grown in africa its original shape. Although they both have the same chemical composition, each of the molecular configurations corresponds to a different material. One of these materials is another austenite and martensite. (Figure: Lai et al) Researchers then worked in the crystal structure of the material, optimizing for crack resistance, which resulted ceramic filaments having a diameter of only 1 micrometer and deformability which allows 7 percent fold (ie an area equivalent to about 7 percent of its size) repeatedly without any break.
Most things can not deform more than 1 percent, and in fact normal ceramic can not even 1 percent bend without breaking. Although crops grown in africa a micrometer is tiny in our daily lives, their size is fully consistent with the requirements of the world of micro-and even many of their own nanotechnology. Because crops grown in africa of the latter, the filaments of the newly developed ceramic and could be useful for artifacts micrometer and even nanometer size, such as those for biomedical applications. For example, shape memory ceramics could be used as microactuators to execute actions in such devices, such as implants release drugs from tiny. Compared with the materials used today in microactuators, the strength of new ceramic filaments allow them to exert a much greater force in a microdevice. Additional information
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