Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA.
Center for Research on Advanced Fiber Technologies (CRAFT), Materials Research Institute, Pennsylvania State University, University Park , PA, USA.
Nat Nanotechnol. 2018 Oct;13(10):959-964. doi: 10.1038/s41565-018-0227-7. Epub 2018 Aug 13.
The dynamic control of thermal transport properties in solids must contend with the fact that phonons are inherently broadband. Thus, efforts to create reversible thermal conductivity switches have resulted in only modest on/off ratios, since only a relatively narrow portion of the phononic spectrum is impacted. Here, we report on the ability to modulate the thermal conductivity of topologically networked materials by nearly a factor of four following hydration, through manipulation of the displacement amplitude of atomic vibrations. By varying the network topology, or crosslinked structure, of squid ring teeth-based bio-polymers through tandem-repetition of DNA sequences, we show that this thermal switching ratio can be directly programmed. This on/off ratio in thermal conductivity switching is over a factor of three larger than the current state-of-the-art thermal switch, offering the possibility of engineering thermally conductive biological materials with dynamic responsivity to heat.
固体中热输运性质的动态控制必须考虑到声子本质上是宽带的这一事实。因此，尽管已经做出了努力来创造可逆热导率开关，但它们的开/关比仅达到中等水平，因为只有声子谱的相对较窄部分受到影响。在这里，我们报告了通过操纵原子振动的位移幅度，在水合作用后，拓扑网络材料的热导率可以调节近四倍，这是通过串联重复 DNA 序列来改变鱿鱼环齿状生物聚合物的网络拓扑或交联结构实现的。我们表明，这种热开关的切换比可以直接编程。这种热导率开关的开/关比比当前最先进的热开关大一个数量级以上，为具有对热动态响应能力的工程导热生物材料的设计提供了可能。
