Chen Sen, Wang Lei, Zhang Qinglei, Liu Jing
Beijing Key Laboratory of Cryo-Biomedical Engineering and Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
Beijing Key Laboratory of Cryo-Biomedical Engineering and Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Sci Bull (Beijing). 2018 Nov 30;63(22):1513-1520. doi: 10.1016/j.scib.2018.10.008. Epub 2018 Oct 18.
Ga-based liquid metal has drawn attention in the field of interface science due to its large deformability. However, the spreading and shaping of liquid metal still remain a huge challenge to be solved owing to its large surface tension. Here, an intriguing synergistic oxidation-driven liquid metal fractal phenomenon was discovered and the general mechanisms were interpreted, which provides a new strategy for manipulating liquid metal. Experimental results demonstrate that the liquid metal placed on the graphite plate exhibited fractal characteristics with the addition of hydrogen peroxide. Here, it is of significance that hydrogen peroxide and graphite plates synergistically oxidize liquid metal. In addition, we predicted that liquid metal fractals can also be achieved on other eligible substrates based on the proposed general mechanism, which was confirmed by relevant experiments. Furthermore, the fractal dimensions of liquid metal fractal pattern were obtained and evaluated, distinguishing the synergistic oxidation-driven liquid metal fractals from the voltage-driven liquid metal fractals. Besides, we initially gave the best concentration range in which dendritic fractals can occur in order to guide practice. The ability to achieve liquid metal fractals promises rich opportunities in freely driving the liquid metal for soft machines and manufacturing the shape-reconfigurable electronic circuits.
基于镓的液态金属因其具有较大的可变形性而在界面科学领域受到关注。然而，由于液态金属具有较大的表面张力，其铺展和成型仍然是一个亟待解决的巨大挑战。在此，我们发现了一种有趣的协同氧化驱动液态金属分形现象，并对其一般机制进行了解释，这为操控液态金属提供了一种新策略。实验结果表明，添加过氧化氢后，放置在石墨板上的液态金属呈现出分形特征。在此，过氧化氢与石墨板协同氧化液态金属具有重要意义。此外，基于所提出的一般机制，我们预测在其他合适的基底上也能实现液态金属分形，相关实验证实了这一点。此外，我们获得并评估了液态金属分形图案的分形维数，将协同氧化驱动的液态金属分形与电压驱动的液态金属分形区分开来。此外，我们初步给出了能出现树枝状分形的最佳浓度范围，以指导实践。实现液态金属分形的能力为软机器自由驱动液态金属以及制造形状可重构的电子电路带来了丰富的机遇。
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