Study of torsional strain effect on dynamic behavior of carbon nanotube thermal actuator
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ORIGINAL PAPER
Study of torsional strain effect on dynamic behavior of carbon nanotube thermal actuator Jianzhang Huang1 · Yue Fan1 · Yalan Guo1 · Yingjing Liang1 Received: 12 January 2020 / Accepted: 5 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, a regulation method through torsional strain effect is proposed for carbon nanotube linear thermal actuators. The effects of torsional strain effect on the linear driven performance of linear actuators are systematically studied by molecular dynamics method, and the effect mechanism is revealed as well. It was found that the torsional strain affects the thermal driving force and the friction effect by changing the spacing between the carbon tubes and lattice vibration modes, then further affects the linear driving characteristics. The influence mechanism of torsional strain on the driving characteristics is analyzed and the valuable conclusions for nanoscale strain engineering application are obtained. The work of this paper provides a new idea for performance regulation for nano-driving by using strain effect, and has important guiding significance for nanoscale strain engineering. Keywords Carbon nanotubes · Nanoscale actuator · Torsional strain effect · Strain engineering
Introduction Due to the great potential of micro-nano-electro-mechanical systems in technology and engineering applications of nano sensor and devices, the development of nanotechnology and its theory has been promoted in the past decade. Investigation on nano-electro-mechanical systems has been a hot topic in worldwide material and mechanical research community [1–4]. Due to the excellent physical and mechanical properties and unique geometry, low interlaminar friction, and good temperature stability of carbon nanotube (CNT), CNT became one of the best materials for building a nano-linear actuator, oscillators, and bi-stable devices since its discovery [5–11]. Since Fennimore and Barreiro fabricated multi-walled carbon nanotube-based nano-actuators in the laboratory [12, 13], a large number of studies on carbon nanotube-based nano-actuating systems have been attracted to reveal the mechanism of nano-actuation and exploit efficient nano-driving strategy [14–20]. Meanwhile, the research on nano-linear actuation phenomenon became Yingjing Liang
[email protected] 1
Department of Engineering Mechanics, School of Civil Engineering, Guangzhou University, Guangzhou, Guangdong Province, 510640, People’s Republic of China
one of the hottest topics in industry research, and it is also the theoretical basis of linear motion devices [21–23]. There are several driving strategies for nano-linear actuator, such as inducing strain or temperature gradients field to cause the imbalance potential energy of the driven object which is compelled to translate along the external physical gradient field [16, 24–27]. So far, most of the published studies are devoted to analysis of the driving mechanism and the influencing factors of driving forces, and suggested to
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