Materials with negative compressibilities in one or more dimensions
Materials with negative compressibilities in one or more dimensions
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DOI：
10.1126/science.279.5356.1522
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发表时间：
1998-03-06
期刊：
影响因子：
56.9
通讯作者：
Dantas, SO
中科院分区：
文献类型：
--
作者：
Baughman, RH;Stafström, S;Dantas, SO
当流体静力压缩时，在一个或多个维度上膨胀的稀有晶体相被确定并显示出负泊松比。这些晶体中的一些(i)在特定方向拉伸时体积减小并在二维方向上膨胀，（ii）在流体静力压缩时表面积增加。本文描述了单晶和复合材料实现负线性和负面积可压缩性的可能机制，并提出了传感器的应用。具有这些特性的材料可以用来制造多孔固体，当被渗透流体静力压缩时，这些多孔固体要么向各个方向膨胀，要么表现得好像它们是不可压缩的。
Rare crystal phases that expand in one or more dimensions when hydrostatically compressed are identified and shown to have negative Poisson's ratios. Some of these crystals (i) decrease volume and expand in two dimensions when stretched in a particular direction and (ii) increase surface area when hydrostatically compressed. Possible mechanisms for achieving such negative linear and area compressibilities are described for single crystals and composites, and sensor applications are proposed. Materials with these properties may be used to fabricate porous solids that either expand in all directions when hydrostatically compressed with a penetrating fluid or behave as if they are incompressible.