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Science子刊:光驱动折纸可自我折叠

摘要 : 2017年3月3日,国际顶尖学术期刊《Science》旗下《Science Advances》杂志上在线发表了美国北卡罗纳大学Jan Genzer研究员的一篇研究论文,论文报道了通过一种特殊的材料可以使折纸自我折叠

2017年3月3日,国际顶尖学术期刊《Science》旗下《Science Advances》杂志上在线发表了美国北卡罗纳大学Jan Genzer研究员的一篇研究论文,论文报道了通过一种特殊的材料可以使折纸自我折叠,被用于塑料杯和泡沫塑料外卖容器的聚苯乙烯在加热时会收缩,这使其成为一种理想的材料。研究人员可把彩色打印和光线相结合,将稀薄的二维塑料进行折叠,使其一步步成为复杂的三维形状。

工程师在塑料上打上墨线,将不同的颜色与其吸收的彩色光相匹配。当光触碰到墨线时,下面的塑料就会吸热并沿着打印的线条收缩,形成折纸的折线。

通过把各种不同的光线按顺序照射到打印的模板上,科学家能控制哪一部分先折叠。受折纸启发,他们通过设计各种不同的打印模式,可用光折叠出类似盒子、金字塔以及厚蟹的形状。

工程师表示,这项新技术未来某一天或会在智能包装、卫星展开以及植入入侵性更小的医疗设备等方面一展身手。目前,该技术已被应用于教育领域。该团队已经将光驱动折纸带入校园和科学课堂,希望激发孩子们对材料科学和工程的兴趣。

原文链接:

Sequential self-folding of polymer sheets

原文摘要:

Shape plays an important role in defining the function of materials, particularly those found in nature. Several strategies exist to program materials to change from one shape to another; however, few can temporally and spatially control the shape. Programming the sequence of shape transformation with temporal control has been driven by the desire to generate complex shapes with high yield and to create multiple shapes from the same starting material. This paper demonstrates a markedly simple strategy for programmed self-folding of two-dimensional (2D) polymer sheets into 3D objects in a sequential manner using external light. Printed ink on the surface of the polymer sheets discriminately absorbs light on the basis of the wavelength of the light and the color of the ink that defines the hinge about which the sheet folds. The absorbed light gradually heats the underlying polymer across the thickness of the sheet, which causes relief of strain to induce folding. These color patterns can be designed to absorb only specific wavelengths of light (or to absorb differently at the same wavelength using color hues), thereby providing control of sheet folding with respect to time and space. This type of shape programming may have numerous applications, including reconfigurable electronics, actuators, sensors, implantable devices, smart packaging, and deployable structures.

来源: Science Advances 浏览次数:0

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