Patterned surfaces are all the rage among researchers seeking to induce surfaces to repel water or adhere to other things, or to modify materials’ electrical properties. Now materials scientists at MIT have added a new wrinkle to research on the patterning of surfaces: While most research has focused on patterns on the outer surfaces of materials, Michael Demkowicz and his team in MIT’s Department of Materials Science and Engineering (DMSE) have begun to explore the effects of patterned surfaces deep within materials — specifically, at the interfaces between layers of crystalline materials. Their results, published in the journal Scientific Reports, show that such control of internal patterns can lead to significant improvements in the performance of the resulting materials. Demkowicz explains that much research has aimed to create layered composites with desired strength, flexibility, or resistance to vibrations, temperature changes, or radiation. But actually controlling the surfaces where two materials meet within a composite is a tricky process. “People don’t think of them as surfaces,” says Demkowicz, an associate professor in DMSE. “If they do, they think of it as a uniform surface, but as it turns out, most interfaces are not uniform.” To control the properties of these materials, it
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