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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.


Dynamic response of motor (nR, nR)/(nS, nS) with nS-nR = 5; LR = 8.1164 nm; a = ~0.248 nm; GS = LR-2a-2b; N = 1; e = 0.4; at 300 K and the rotor without hydrogenation.(a) Initial models of the motor. (b) History of rotational frequency of rotors. (c) Fitting function between SRF of the rotor and the chirality parameter of stator, nS.
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f6: Dynamic response of motor (nR, nR)/(nS, nS) with nS-nR = 5; LR = 8.1164 nm; a = ~0.248 nm; GS = LR-2a-2b; N = 1; e = 0.4; at 300 K and the rotor without hydrogenation.(a) Initial models of the motor. (b) History of rotational frequency of rotors. (c) Fitting function between SRF of the rotor and the chirality parameter of stator, nS.

Mentions: Above discussion indicates that the diameter difference between rotor and the stator have obvious influence on SRF. It is, therefore, important to study effects of the motors (with the same diameter differences between rotor and stator when both tubes are armchair types) on SRF. Seven cases are involved in the study (Fig. 6a). Figure 6b shows that SRF of rotor is also sensitive to the diameter of the rotor or stator. For example, when the rotor (9, 9) rotates in the stator (14, 14), the SRF is ~167.2 GHz. However, SRF decreases sharply when the diameter of the rotor increases. When the rotor (50, 50) is driven by stator (55, 55), SRF is only ~11.8 GHz. The major reason is that the friction between rotor and stator becomes higher when their diameters are larger. At the same time, the motors have the same IRD schemes, i.e., N = 1 and e = 0.4. Hence, the rotor with larger diameter approaches stable rotation with lower frequency. During thermal vibration of the atoms on rotor, the chance of collision between the rotor and stators is reduced when the rotor has larger diameter. This causes longer rotational acceleration time of the rotor as can be seen from Fig. 6b.


Robust rotation of rotor in a thermally driven nanomotor
Dynamic response of motor (nR, nR)/(nS, nS) with nS-nR = 5; LR = 8.1164 nm; a = ~0.248 nm; GS = LR-2a-2b; N = 1; e = 0.4; at 300 K and the rotor without hydrogenation.(a) Initial models of the motor. (b) History of rotational frequency of rotors. (c) Fitting function between SRF of the rotor and the chirality parameter of stator, nS.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: Dynamic response of motor (nR, nR)/(nS, nS) with nS-nR = 5; LR = 8.1164 nm; a = ~0.248 nm; GS = LR-2a-2b; N = 1; e = 0.4; at 300 K and the rotor without hydrogenation.(a) Initial models of the motor. (b) History of rotational frequency of rotors. (c) Fitting function between SRF of the rotor and the chirality parameter of stator, nS.
Mentions: Above discussion indicates that the diameter difference between rotor and the stator have obvious influence on SRF. It is, therefore, important to study effects of the motors (with the same diameter differences between rotor and stator when both tubes are armchair types) on SRF. Seven cases are involved in the study (Fig. 6a). Figure 6b shows that SRF of rotor is also sensitive to the diameter of the rotor or stator. For example, when the rotor (9, 9) rotates in the stator (14, 14), the SRF is ~167.2 GHz. However, SRF decreases sharply when the diameter of the rotor increases. When the rotor (50, 50) is driven by stator (55, 55), SRF is only ~11.8 GHz. The major reason is that the friction between rotor and stator becomes higher when their diameters are larger. At the same time, the motors have the same IRD schemes, i.e., N = 1 and e = 0.4. Hence, the rotor with larger diameter approaches stable rotation with lower frequency. During thermal vibration of the atoms on rotor, the chance of collision between the rotor and stators is reduced when the rotor has larger diameter. This causes longer rotational acceleration time of the rotor as can be seen from Fig. 6b.

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.