Superheating and homogeneous single bubble nucleation in a solid-state nanopore.
Superheating and homogeneous single bubble nucleation in a solid-state nanopore.
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DOI：
10.1103/physrevlett.113.024506
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发表时间：
2014-07-11
影响因子：
8.6
通讯作者：
Golovchenko JA
中科院分区：
文献类型：
--
作者：
Nagashima G;Levine EV;Hoogerheide DP;Burns MM;Golovchenko JA
我们展示了极端过热和单气泡成核的电解质溶液中的纳米孔在薄氮化硅膜。高温是通过由适度的电压偏置引起的流过孔的高度集中的离子电流的焦耳加热来实现的。电导率，成核，和气泡演变的电子和光学监测。在大气压下，系统在气泡成核之前达到接近热力学极限的温度。气泡成核是均匀的并且高度可重复。这种纳米孔方法更普遍地表明了对物质的高度亚稳态的激发、检测和表征的广泛应用。
We demonstrate extreme superheating and single bubble nucleation in an electrolyte solution within a nanopore in a thin silicon nitride membrane. The high temperatures are achieved by Joule heating from a highly focused ionic current induced to flow through the pore by modest voltage biases. Conductance, nucleation, and bubble evolution are monitored electronically and optically. Temperatures near the thermodynamic limit of superheat are achieved just before bubble nucleation with the system at atmospheric pressure. Bubble nucleation is homogeneous and highly reproducible. This nanopore approach more generally suggests broad application to the excitation, detection, and characterization of highly metastable states of matter.