Carbon nanotube-based charge-controlled speed-regulating nanoclutch

Zhang, Zhong‐Qiang; Ye, Hongfei; Liu, Zhen; Ding, Jianning; Cheng, Guanggui; Ling, Zhijian; Zheng, Yonggang; Wang, Lei; Wang, Jinbao

doi:10.1063/1.4724344

Cited by 16 publications

(9 citation statements)

References 20 publications

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“…10. The varying trend is in agreement with the pure water molecules confined in CNTs, 32 while the difference is that the threshold of the charge magnitude is 1.2 e for the pure water confined in the CNT walls. This result can also be interpreted by the relationship between the shear stress and shear rate in Fig.…”

Section: Influence Of the Charge Magnitudesupporting

confidence: 71%

“…32,35 Here we take into account the influence of the charge magnitude on the boundary slip and accumulation of the fullerene molecules within the fullerene-water NFs in Couette model with the shearing velocity of 300 m/s. It can be observed that the boundary slip velocity is not varied monotonically with the charge magnitude on graphene sheets, which decreases with the charge magnitude below a threshold of 0.6 e, and then increase appreciably, as shown in Fig.…”

Section: Influence Of the Charge Magnitudementioning

confidence: 99%

“…Figure 2 shows that the velocity profiles of the fullerene-water NFs are approximately linear even though they exhibit nonlinear trend at the two boundaries for the high shear rateγ (The shear rate is equal to the slope of the linear velocity profiles) due to inhomogeneous viscosity in channel width direction induced by the solid-like structure at the solid-fluid interfaces. 32 The slip velocity appears in the region adjacent to the graphene sheets, and then the slip velocity v s can be computed by calculating the difference between the boundary flow velocity and the shearing velocity of the graphene. It can be observed that the slip velocity increases almost linearly with the shear rate before a threshold of ∼80 ns -1 while it increases sharply with the shear rate for theγ above the threshold, as show in Fig.…”

Section: A Fullerene-water Nfs In Couette Modelmentioning

confidence: 99%

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Fullerene-water nanofluid confined in graphene nanochannel

Liu

Zhang

2017

AIP Advances

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The flow behaviors and boundary slip of the fullerene-water nanofluids (NFs) confined in graphene nanochannels are first investigated by using classical molecular dynamics simulations. The influences of the shear rate in Couette model, the driving force in Poiseuille model, the volume fraction, and the charge magnitude on the motion behaviors and the boundary slip are explored with considering the dynamics and the accumulation of the fullerene within the NFs. The results show that the boundary slip velocity increases almost linearly with the shear rate below a threshold of the shear rate while it increases sharply above the threshold. The relatively large driving force in Poiseuille model and the large shear rate in Couette model can reduce the accumulation of the fullerenes. The increase in the volume fraction of the fullerene in NFs can enhance the shear viscosity, and interestingly, it can increase the boundary slip velocity of the NFs in graphene channels. As the charge magnitude of the graphene channel increases, the boundary slip of fullerene NFs first increases to a threshold and then decreases slightly. The findings may be helpful to the design and fabrication of the low dimensional carbon materials-based nano-apparatus.

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Section: Influence Of the Charge Magnitudesupporting

confidence: 71%

Section: Influence Of the Charge Magnitudementioning

confidence: 99%

Section: A Fullerene-water Nfs In Couette Modelmentioning

confidence: 99%

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Fullerene-water nanofluid confined in graphene nanochannel

Liu

Zhang

2017

AIP Advances

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“…The five CNTs with different diameters are considered to examine the size dependence of the mechanical property. In addition, it has been proved that the electricity, the ubiquitous environment in biological molecules, could make an obvious effect on the water molecules inside the CNTs 19 20 21 . Therefore, the electric field is also taken into account in the MD simulation reported here.…”

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confidence: 99%

Water filling and electric field-induced enhancement in the mechanical property of carbon nanotubes

Zheng

Zhang

et al. 2015

Sci Rep

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The effects of water filling and electric field on the mechanical property of carbon nanotubes (CNTs) are investigated with molecular dynamics simulations. The simulation results indicate that the water filling and electric field could enhance the elastic modulus but reduce the Poisson’s ratio of the CNTs. As for the buckling behaviors, a significant enhancement could be observed in the yield stress and average post-buckling stress of the CNTs. In particular, the enhancement in the yield stress induced by the water filling and electric field could be even higher than that resulted from the solid filling. Moreover, a transition mechanism from the rod instability to shell buckling is shown to explain the nonmonotonic variation of yield stress, and the critical diameter can be tuned through filling the water molecules and applying the electric field. The present findings provide a valuable route for the optimized design and application of the nanoscale functional devices based on the water-filled CNTs.

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“…[4][5][6][7][8]. Molecular dynamics (MD) simulations have explored the effects of an electric field on nanochannel transportation characteristics, where an electric field can be achieved by assigning charges near a nanochannel [9][10][11][12][13][14][15], adding ions to the water phases on both sides of a nanotube [16][17][18], or directly using MD software such as NAMD [8,19,20], GROMACS, etc. [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics studies on the influences of a gradient electric field on the water chain in a peptide nanotube

Fan

et al. 2014

J Mol Model

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The structure and transportation characteristics of the water chain inside a 8×cyclo-(WL) 4 peptide nanotube (PNT) were simulated under a gradient electric (GE) field. The gradient was defined by the ratio of a constant (E a ) and the z-directional length (L z ) of the simulation box. E a varies from 0.0 to 0.9 V nm −1 . As the gradient increases, the probabilities of finding two water molecules in an α-plane zone and three in a midplane region increase. To accommodate more water molecules, the axial array of channel water molecules becomes more compact. Meanwhile, the H-bonded network between the channel water is greatly intensified when E a increases from 0.3 to 0.9 V nm −1 . Nevertheless, the proportion of strong H-bonds does not increase significantly following the formation of a more compact axial array of water molecules. When E a reaches 0.9 V nm −1 , the water molecule in an α-plane zone may be dragged by its neighboring water molecules into the midplane region, resulting in a significant deviation from the channel axis. With the augment of the gradient, the dipoles of channel water are gradually oriented along the tube axis in the sequence from gap 1 to 7, namely along the direction of the electric field. Nevertheless, even when E a reaches 0.9 V nm −1 , the dipole orientation of the channel water is not complete, and dipole flips still occur in gap 7. Under a GE field, the rightward and leftward hopping rates of channel water are no longer equal to each other, i.e., channel water performs an asymmetric transportation.

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Carbon nanotube-based charge-controlled speed-regulating nanoclutch

Cited by 16 publications

References 20 publications

Fullerene-water nanofluid confined in graphene nanochannel

Fullerene-water nanofluid confined in graphene nanochannel

Water filling and electric field-induced enhancement in the mechanical property of carbon nanotubes

Molecular dynamics studies on the influences of a gradient electric field on the water chain in a peptide nanotube

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