Dynamic chemical expansion of thin-film non-stoichiometric oxides at extreme temperatures.
Dynamic chemical expansion of thin-film non-stoichiometric oxides at extreme temperatures.
复制标题
薄膜非化学计量氧化物在极端温度下的动态化学膨胀。
作者：
Jessica Swallow;J. J. Kim;J. M. Maloney;Di Chen;James F. Smith;S. Bishop;H. Tuller;K. V. Van Vliet
在越来越极端和偏远的条件下操作致动器需要在高温和各种气体环境下可靠地感测和致动的材料。这种材料的设计将依赖于高温，高分辨率的方法来表征材料致动原位。在这里，我们展示了一种新型的高温，低压机电氧化物致动器的基础上的模型材料PrxCe 1-xO 2-δ（PCO）。化学应变和界面应力导致电化学泵氧进入或出PCO膜，导致可测量的膜体积变化，由于化学膨胀。在650 °C下，在电偏置值<0.1 V的情况下实现了>0.1%的纳米级位移和应变，与压电驱动的致动器相比，电偏置值较低，应力引起的结构偏转使应变放大了五倍。这operando测量薄膜的“呼吸”在第二个尺度的时间分辨率也使详细的识别控制动力学的这种响应，并可以扩展到其他电化学机械耦合氧化膜在极端温度下。
Actuator operation in increasingly extreme and remote conditions requires materials that reliably sense and actuate at elevated temperatures, and over a range of gas environments. Design of such materials will rely on high-temperature, high-resolution approaches for characterizing material actuation in situ. Here, we demonstrate a novel type of high-temperature, low-voltage electromechanical oxide actuator based on the model material PrxCe1-xO2-δ (PCO). Chemical strain and interfacial stress resulted from electrochemically pumping oxygen into or out of PCO films, leading to measurable film volume changes due to chemical expansion. At 650 °C, nanometre-scale displacement and strain of >0.1% were achieved with electrical bias values <0.1 V, low compared to piezoelectrically driven actuators, with strain amplified fivefold by stress-induced structural deflection. This operando measurement of films 'breathing' at second-scale temporal resolution also enabled detailed identification of the controlling kinetics of this response, and can be extended to other electrochemomechanically coupled oxide films at extreme temperatures.
完全悬浮的生物细胞的机械流动性。
影响因子：
3.4
作者：
Maloney,JohnM;Lehnhardt,Eric;Long,AlexandraF;VanVliet,KrystynJ
通讯作者：
VanVliet,KrystynJ
影响因子：
21.8
作者：
Kumar, Amit;Ciucci, Francesco;Jesse, Stephen
通讯作者：
Jesse, Stephen