An <i>ex-situ</i> method to convert vertically aligned carbon nanotubes array to horizontally aligned carbon nanotubes mat

Islam, Saiful; Saleh, Tanveer; Asyraf, M.R. Mohd; Ali, Mohamed Sultan Mohamed

doi:10.1088/2053-1591/aaecc1

Cited by 9 publications

(5 citation statements)

References 28 publications

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“…On the other hand, lateral compression of isolated CNTs or CNT bundles [34][35][36][37][38] is of interest, but this loading scheme has received much less attention of the researchers. Horizontally aligned CNT bundles can be obtained from the vertically aligned CNT arrays by winding, drawing, micromechanical rolling, and shear pressing [39][40][41][42]. Mechanical properties of CNTs, evaluated in the experimental and computational studies, have been outlined in the review [43].…”

Section: Introductionmentioning

confidence: 99%

Elastic Damper Based on the Carbon Nanotube Bundle

Rysaeva¹,

Korznikova²,

Мурзаев³

et al. 2020

FU Mech Eng

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Mechanical response of the carbon nanotube bundle to uniaxial and biaxial lateral compression followed by unloading is modeled under plane strain conditions. The chain model with a reduced number of degrees of freedom is employed with high efficiency. During loading, two critical values of strain are detected. Firstly, period doubling is observed as a result of the second order phase transition, and at higher compressive strain, the first order phase transition takes place when carbon nanotubes start to collapse. The loading-unloading stress-strain curves exhibit a hysteresis loop and, upon unloading, the structure returns to its initial form with no residual strain. This behavior of the nanotube bundle can be employed for the design of an elastic damper.

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Section: Introductionmentioning

confidence: 99%

Elastic Damper Based on the Carbon Nanotube Bundle

Rysaeva¹,

Korznikova²,

Мурзаев³

et al. 2020

FU Mech Eng

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show abstract

“…Lateral compression of CNT bundles or isolated CNTs is also of interest [42][43][44][45][46]. Horizontally aligned CNT array are produced from as grown vertically aligned CNT bundles by drawing, rolling, and shear pressing [47][48][49][50]. It has been shown that CNT bundles are linear elastic up to 1.5 GPa hydrostatic pressure with the volume compressibility of 0.024 GPa −1 [51].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Response of Carbon Nanotube Bundle to Lateral Compression

et al. 2020

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Structure evolution and mechanical response of the carbon nanotube (CNT) bundle under lateral biaxial compression is investigated in plane strain conditions using the chain model. In this model, tensile and bending rigidity of CTN walls, and the van der Waals interactions between them are taken into account. Initially the bundle in cross section is a triangular lattice of circular zigzag CNTs. Under increasing strain control compression, several structure transformations are observed. Firstly, the second-order phase transition leads to the crystalline structure with doubled translational cell. Then the first-order phase transition takes place with the appearance of collapsed CNTs. Further compression results in increase of the fraction of collapsed CNTs at nearly constant compressive stress and eventually all CNTs collapse. It is found that the potential energy of the CNT bundle during deformation changes mainly due to bending of CNT walls, while the contribution from the walls tension-compression and from the van der Waals energies is considerably smaller.

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“…Not only tension [7,13,14,15,16,17,18] and compression of vertically aligned CNT brushes and forests [31,32,33,34,35,36,37,38], but also lateral compression of isolated CNT or CNT bundles [39,40,41,42,43] is of interest, and the latter loading scheme has been studied less thoroughly than the former ones. Drawing, winding, micromechanical rolling, and shear pressing were used to produce horizontally aligned CNT bundles from vertically aligned CNT arrays [44,45,46,47]. Experimental and computational approaches used for evaluation of mechanical properties of CNTs have been outlined in the review [48].…”

Section: Introductionmentioning

confidence: 99%

Chain Model for Carbon Nanotube Bundle under Plane Strain Conditions

Korznikova

Rysaeva

Savin³

et al. 2019

Materials

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Carbon nanotubes (CNTs) have record high tensile strength and Young’s modulus, which makes them ideal for making super strong yarns, ropes, fillers for composites, solid lubricants, etc. The mechanical properties of CNT bundles have been addressed in a number of experimental and theoretical studies. The development of efficient computational methods for solving this problem is an important step in the design of new CNT-based materials. In the present study, an atomistic chain model is proposed to analyze the mechanical response of CNT bundles under plane strain conditions. The model takes into account the tensile and bending rigidity of the CNT wall, as well as the van der Waals interactions between walls. Due to the discrete character of the model, it is able to describe large curvature of the CNT wall and the fracture of the walls at very high pressures, where both of these problems are difficult to address in frame of continuum mechanics models. As an example, equilibrium structures of CNT crystal under biaxial, strain controlled loading are obtained and their thermal stability is analyzed. The obtained results agree well with previously reported data. In addition, a new equilibrium structure with four SNTs in a translational cell is reported. The model offered here can be applied with great efficiency to the analysis of the mechanical properties of CNT bundles composed of single-walled or multi-walled CNTs under plane strain conditions due to considerable reduction in the number of degrees of freedom.

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An ex-situ method to convert vertically aligned carbon nanotubes array to horizontally aligned carbon nanotubes mat

Cited by 9 publications

References 28 publications

Elastic Damper Based on the Carbon Nanotube Bundle

Elastic Damper Based on the Carbon Nanotube Bundle

Mechanical Response of Carbon Nanotube Bundle to Lateral Compression

Chain Model for Carbon Nanotube Bundle under Plane Strain Conditions

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