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Robust rotation of rotor in a thermally driven nanomotor

View Article: PubMed Central - PubMed

ABSTRACT

In the fabrication of a thermally driven rotary nanomotor with the dimension of a few nanometers, fabrication and control precision may have great influence on rotor’s stability of rotational frequency (SRF). To investigate effects of uncertainty of some major factors including temperature, tube length, axial distance between tubes, diameter of tubes and the inward radial deviation (IRD) of atoms in stators on the frequency’s stability, theoretical analysis integrating with numerical experiments are carried out. From the results obtained via molecular dynamics simulation, some key points are illustrated for future fabrication of the thermal driven rotary nanomotor.

No MeSH data available.


Related in: MedlinePlus

Dynamic response of motor (9, 9)/(14, 14) with LR = 8.1164 nm, a = ~0.248 nm, GS = LR-2a-2b, N = 1 and e = 0.4 at different temperature.(a) History curves of rotational frequency of rotor at temperature below 475 K. (b) Stable rotational frequency v.s. temperature. (c) History curves of rotational frequency of rotor at temperature above 475 K. (d) Configurations before and after collapse of the motor at 500 K (blue line in (c), see Movie 1).
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f2: Dynamic response of motor (9, 9)/(14, 14) with LR = 8.1164 nm, a = ~0.248 nm, GS = LR-2a-2b, N = 1 and e = 0.4 at different temperature.(a) History curves of rotational frequency of rotor at temperature below 475 K. (b) Stable rotational frequency v.s. temperature. (c) History curves of rotational frequency of rotor at temperature above 475 K. (d) Configurations before and after collapse of the motor at 500 K (blue line in (c), see Movie 1).

Mentions: Figure 2 Illustrates the history of rotation of the rotor at different temperature. It can be seen that the rotor has no obvious rotation when temperature is less than 66.5 K (Fig 2b). When the temperature reaches 66.6 K, the rotation of the rotor tends to be stable after about 4 ns. The rotation of the rotor is accelerated by the collision between atoms on the rotor and IRD atoms on the stator. The other atoms on the stator will resist the rotation. Hence, the rotational frequency of the rotor increases from zero to a stable value and does not increase further. The stable rotational frequency (SRF) of the rotor at 66.6 K is ~165.26 GHz. Hence, 66.6 K can be considered as the lower boundary of temperature interval of thermal driven rotation. When the temperature becomes higher, the SRF of the rotor increases slightly. For example, at 70 K, the SRF is ~165.51 GHz. SRF of the rotor is ~167.2 GHz at 300 K, ~168.46 GHz at 450 K, and ~168.66 GHz at 475 K. It indicates that the difference of SRF of the rotor is ~3.40 GHz when the temperature varies from 66.6 K to 475 K. The relative difference is only ~2.06%. The ratio of frequency difference over temperature difference is only 0.00833 GHz/K. When the temperature of system varies within a narrow interval, the fluctuation of rotational frequency of the rotor can, therefore, be considered as a constant.


Robust rotation of rotor in a thermally driven nanomotor
Dynamic response of motor (9, 9)/(14, 14) with LR = 8.1164 nm, a = ~0.248 nm, GS = LR-2a-2b, N = 1 and e = 0.4 at different temperature.(a) History curves of rotational frequency of rotor at temperature below 475 K. (b) Stable rotational frequency v.s. temperature. (c) History curves of rotational frequency of rotor at temperature above 475 K. (d) Configurations before and after collapse of the motor at 500 K (blue line in (c), see Movie 1).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5385497&req=5

f2: Dynamic response of motor (9, 9)/(14, 14) with LR = 8.1164 nm, a = ~0.248 nm, GS = LR-2a-2b, N = 1 and e = 0.4 at different temperature.(a) History curves of rotational frequency of rotor at temperature below 475 K. (b) Stable rotational frequency v.s. temperature. (c) History curves of rotational frequency of rotor at temperature above 475 K. (d) Configurations before and after collapse of the motor at 500 K (blue line in (c), see Movie 1).
Mentions: Figure 2 Illustrates the history of rotation of the rotor at different temperature. It can be seen that the rotor has no obvious rotation when temperature is less than 66.5 K (Fig 2b). When the temperature reaches 66.6 K, the rotation of the rotor tends to be stable after about 4 ns. The rotation of the rotor is accelerated by the collision between atoms on the rotor and IRD atoms on the stator. The other atoms on the stator will resist the rotation. Hence, the rotational frequency of the rotor increases from zero to a stable value and does not increase further. The stable rotational frequency (SRF) of the rotor at 66.6 K is ~165.26 GHz. Hence, 66.6 K can be considered as the lower boundary of temperature interval of thermal driven rotation. When the temperature becomes higher, the SRF of the rotor increases slightly. For example, at 70 K, the SRF is ~165.51 GHz. SRF of the rotor is ~167.2 GHz at 300 K, ~168.46 GHz at 450 K, and ~168.66 GHz at 475 K. It indicates that the difference of SRF of the rotor is ~3.40 GHz when the temperature varies from 66.6 K to 475 K. The relative difference is only ~2.06%. The ratio of frequency difference over temperature difference is only 0.00833 GHz/K. When the temperature of system varies within a narrow interval, the fluctuation of rotational frequency of the rotor can, therefore, be considered as a constant.

View Article: PubMed Central - PubMed

ABSTRACT

In the fabrication of a thermally driven rotary nanomotor with the dimension of a few nanometers, fabrication and control precision may have great influence on rotor’s stability of rotational frequency (SRF). To investigate effects of uncertainty of some major factors including temperature, tube length, axial distance between tubes, diameter of tubes and the inward radial deviation (IRD) of atoms in stators on the frequency’s stability, theoretical analysis integrating with numerical experiments are carried out. From the results obtained via molecular dynamics simulation, some key points are illustrated for future fabrication of the thermal driven rotary nanomotor.

No MeSH data available.


Related in: MedlinePlus