Four-dimensional (4-D) printing can create complex 3-D geometries that react to environmental stimuli, opening new design opportunities in materials science. A vast majority of 4-D printing approaches use polymer materials, which limit the operational temperature during the process of engineering. In a recent study, Xiaolong Chen and co-workers at the Dyson School of Design and Engineering, Department of Earth Science and Engineering and Department of Materials at the Imperial College of London, U.K., developed a new multi-metal electrochemical 3-D printer. The device was able to construct bimetallic geometries by selectively depositing different metals with temperature-responsive behavior programmed into the printed structure. In the study, they demonstrated a meniscus confined electrochemical 3-D printing approach using a multi-print head design and nickel and copper materials as examples, the ability can be transferred to other deposition solutions. The results are now published in Scientific Reports.
* This article was originally published here
Friday 15 March 2019
Nitrogen pollution's path to streams weaves through more forests (and faster) than suspected
Nitrogen in rain and snow falls to the ground where, in theory, it is used by forest plants and microbes. New research by a scientific collaboration led by the USDA Forest Service shows that more nitrogen from rain and snow is making it to more streams than previously believed and flowing downstream in forests of the United States and Canada. The study, "Unprocessed atmospheric nitrate in waters of the Northern Forest Region in the USA and Canada," was published this week in the journal Environmental Science & Technology.
* This article was originally published here
* This article was originally published here
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