将纳米带加工成半径和螺距可控的微螺旋
Shaping Nanoscale Ribbons into Micro-Helices of Controllable Radius and Pitch
摘要：
我们报告的高度灵活的微米级螺旋制造纳米厚的带。建立在这种超薄带介导的表面张力的螺旋盘绕，我们证明了高度受限的材料的增强的蠕变性能可以被利用来形成螺旋到所需的几何形状与最终形状的完全控制。螺旋半径、总长度和螺旋角都在宽范围内自由且独立地可调：半径在$\sim$ 1-100微米内，长度在$\sim$ 100-3000微米内，螺旋角在$\sim$ 0-70°内。这种制造方法被验证为三种不同的材料：聚（甲基丙烯酸甲酯），聚（甲基丙烯酸二甲氨基乙酯），和过渡金属硫族化物量子点，每个对应于不同的固相结构：分别是一个聚合物玻璃，交联水凝胶，和纳米粒子阵列。这证明了材料选择方面的出色通用性，从而能够进一步控制螺旋机械性能。
英文摘要：
We report fabrication of highly flexible micron-sized helices from nanometer-thick ribbons. Building upon the helical coiling of such ultra-thin ribbons mediated by surface tension, we demonstrate that the enhanced creep properties of highly confined materials can be leveraged to shape helices into the desired geometry with full control of the final shape. The helical radius, total length and pitch angle are all freely and independently tunable within a wide range: radius within $\sim$ 1-100 micrometer, length within $\sim$ 100-3000 micrometer, and pitch angle within $\sim$ 0-70°. This fabrication method is validated for three different materials: poly(methyl methacrylate), poly(dimethylaminoethyl methacrylate), and transition metal chalcogenide quantum dots, each corresponding to a different solid-phase structure: respectively a polymer glass, a crosslinked hydrogel, and a nanoparticle array. This demonstrates excellent versatility with respect to material selection, enabling further control of the helix mechanical properties.
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