Robust rotation of rotor in a thermally driven nanomotor

Cai, Kun; Yu, Jin; Shi, Jing; Qin, Qing‐Hua

doi:10.1038/srep46159

Cited by 11 publications

(4 citation statements)

References 45 publications

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“…This finding also indicates that dehydrogenation of the rotor does not occur at 1500 K. Moreover, the value of ω decreases continuously during the heating process, indicating that [800, 1500] K can also be considered a controllable zone. 51 3.2.b. Cooling Process.…”

Section: Resultsmentioning

confidence: 98%

Spectrum of Temperature-Dependent Rotational Frequency of the Rotor in a Thermally Diven Rotary Nanomotor

Cai

Shi

et al. 2017

J. Phys. Chem. C

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By fixing of the outer tube of double-walled carbon nanotubes, a thermally driven rotary nanomotor can be obtained one or more carbon atoms at the end of the stator have an obvious inward radial deviation. Due to the asymmetry of the potential field of the stator, a collision between two tubes leads to the axial component of angular momentum that drives the rotation of the rotor. Relative sliding between the two tubes is resisted due to the roughness of the potential field of stators. Hence, the rotational frequency of the rotor has a maximal value in the balanced state. The spectrum of rotational frequency with respect to temperatures from 8 to 2000 K is presented by means of molecular dynamics simulation. The temperature interval is divided into five zones on the basis of the characteristics of the spectrum. In the robust zone, the nanomotor exhibits stationary rotation. In the controllable zone, the rotational frequency of rotor can be adjusted by varying the temperature. In particular, if a rotating rotor is cooled to an ultralow temperature, the final stable value of the rotational frequency is still very high and is slightly lower than the maximal value rather than zero; i.e., the nanomotor will theoretically never stop rotating.

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Section: Resultsmentioning

confidence: 98%

Spectrum of Temperature-Dependent Rotational Frequency of the Rotor in a Thermally Diven Rotary Nanomotor

Cai

Shi

et al. 2017

J. Phys. Chem. C

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“…The second major contribution to the output power should be the diameter of the rotor. However, the output power depends slightly on T or the interaction between T and N. Hence, the output power shows robustness with respect to temperature [39]. From the above analysis, theconclusion can be made that the output power of a motor can be improved significantly by adjusting the value of N or n i , or both of them.…”

Section: Multiple Regression Analysismentioning

confidence: 98%

Significance tests on the output power of a thermally driven rotary nanomotor

et al. 2017

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Many factors can have a significant influence on the output power of a thermally driven rotary nanomotor made of carbon nanotubes (CNTs). Making use of a computational molecular dynamics approach, we evaluate for the first time the output power of a nanomotor, considering some of the main factors including temperature, the diameter of the rotor and the number of IRD atoms (N) on the stator. When applying extra-resistant torque to the rotor to let the stable value of the rotational frequency of the rotor fluctuate near zero, the value of the resistant torque can be considered as the output power of the rotor. The effects of these factors on the output power of a motor are roughly predicted via a fitting approach. Using stepwise regression analysis, we discover that N has the greatest influence on the output power. The second and the third main factors that affect the output power of a nanomotor are the diameter of the rotor, and the interaction between N and the diameter, respectively. To improve the output power of a nanomotor, one can place more IRD atoms in the system and/or employ CNTs with larger diameters.

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“…The required translation and dynamic control of the two-layer structure can be achieved by microelectromechanical systems designed for horizontal movements 24,56–61 . For moving parallel plates in the range of micrometers with nanoscale resolution, various actuation mechanisms, such as electrostatical 62,63 , thermal 64,65 and electrical 66 have been developed.…”

Section: Introductionmentioning

confidence: 99%

All-silicon reconfigurable metasurfaces for multifunction and tunable performance at optical frequencies based on glide symmetry

Shanei

Fathi

Ghasemifard

et al. 2019

Sci Rep

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Dielectric metasurfaces have opened promising possibilities to enable a versatile platform in the miniaturization of optical elements at visible and infrared frequencies. Due to high efficiency and compatibility with CMOS fabrication technology, silicon-based metasurfaces have a remarkable potential for a wide variety of optical devices. Adding tunability mechanisms to metasurfaces could be beneficial for their application in areas such as communications, imaging and sensing. In this paper, we propose an all-silicon reconfigurable metasurface based on the concept of glide symmetry. The reconfigurability is achieved by a phase modulation of the transmitted wave activated by a lateral displacement of the layers. The misalignment between the layers creates a new inner periodicity which leads to the formation of a metamolecule with a new sort of near-field interaction. The proposed approach is highly versatile for developing multifunctional and tunable metadevices at optical frequencies. As a proof of concept, in this paper, we design a bifunctional metadevice, as well as a tunable lens and a controllable beam deflector operating at 1.55 μm.

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Robust rotation of rotor in a thermally driven nanomotor

Cited by 11 publications

References 45 publications

Spectrum of Temperature-Dependent Rotational Frequency of the Rotor in a Thermally Diven Rotary Nanomotor

Spectrum of Temperature-Dependent Rotational Frequency of the Rotor in a Thermally Diven Rotary Nanomotor

Significance tests on the output power of a thermally driven rotary nanomotor

All-silicon reconfigurable metasurfaces for multifunction and tunable performance at optical frequencies based on glide symmetry

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