Svetovoy Vitaly B, Sanders Remko G P, Lammerink Theo S J, Elwenspoek Miko C
MESA+ Research Institute, University of Twente, PO 217, NL-7500 AE Enschede, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2011 Sep;84(3 Pt 2):035302. doi: 10.1103/PhysRevE.84.035302. Epub 2011 Sep 22.
Ignition of exothermic chemical reactions in small volumes is considered as difficult or impossible due to the large surface-to-volume ratio. Here observation of the spontaneous reaction is reported between hydrogen and oxygen in bubbles whose diameter is smaller than a threshold value around 150 nm. The effect is attributed to high Laplace pressure and to fast dynamics in nanobubbles and is the first indication on combustion in the nanoscale. In this study the bubbles were produced by water electrolysis using successive generation of H(2) and O(2) above the same electrode with short voltage pulses in the microsecond range. The process was observed in a microsystem at current densities >1000 A/cm(2) and relative supersaturations >1000.
由于表面积与体积之比很大，小体积内的放热化学反应点火被认为是困难的或不可能的。在此报告了直径小于约150纳米的阈值的气泡中氢气与氧气之间自发反应的观察结果。该效应归因于高拉普拉斯压力和纳米气泡中的快速动力学，并且是纳米尺度燃烧的首个迹象。在本研究中，通过在微秒范围内的短电压脉冲在同一电极上方连续产生H₂和O₂，利用水电解产生气泡。在电流密度>1000 A/cm²和相对过饱和度>1000的微系统中观察到了该过程。
