Mechanical model and superelastic properties of carbon microcoils with circular cross-section

Bi, Hui; Kou, Kaichang; Ostrikov, Kostya Ken; Zhang, J. Q.; Wang, Z. C.

doi:10.1063/1.3177324

Cited by 11 publications

(5 citation statements)

References 26 publications

(27 reference statements)

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“…To investigate the mechanical elasticity of the gratingstructured microsprings in uid, the periodic S-shaped crosssection of the grating-structured metallic nanomembranes (see Fig. S5(a), ESI †), which is distinguished from the general rectangular, square, or circular cross-section of previous micro-/ nano-springs or coils, 7,31,[45][46][47] was carefully studied. Theoretically, the drag force of a smooth microspring F d-smooth , counterbalanced by the "anchor force" from the xed end, can be expressed by the following equation:…”

Section: Properties Of Owing Rate Sensingmentioning

confidence: 99%

Grating-structured metallic microsprings

et al. 2014

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We fabricate grating-structured metallic microsprings with well-defined helical angles and diameters, which are self-rolled from strained nanomembranes patterned with gratings. The grating structures on the metal membrane, replicated from the imprinted polymer layer beneath, give rise to the controlled rolling direction after selective etching of the underlying sacrificial layer. The rolling direction of the grating-structured thin metal film is always perpendicular to the long side edge of gratings, offering a good way to roll up strained strips into well controlled three-dimensional (3D) microsprings simply by altering the dimension and orientation of the structured strips. The mechanical elasticity of these grating-structured metallic microsprings is verified for the potential application as a flow rate sensor. Our work may stimulate rigorous synthesis of highly functional and complex 3D helical micro and nanostructures, and hint a broad range of applications such as environmental sensors, micro-/nanoscale robots, metamaterials, etc.

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Section: Properties Of Owing Rate Sensingmentioning

confidence: 99%

Grating-structured metallic microsprings

et al. 2014

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“…Other experimental measures [3,4] and other numerical simulations [9,10,11,12] are realized to verify and determine the CCNT mechanical properties. Unfortunately, the results are quite dispersed.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Mechanical Properties of Coiled Carbon Nanotubes by Molecular Structural Mechanics Based Finite Element Modelling

Hamza

Dahmoun

Chaterbache

et al. 2017

DDF

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Carbon nanotubes (NTC) have very spectacular mechanical properties related to their nanometric structure, their perfect arrangement and their one-dimensional geometry. As with all materials, structural defects are inevitable and affects NTC properties. Among these defects, we distinguish the topological defects, the dislocations and the penta-hepta defect. But the presence of these defects is not totally harmful, because the existence of some structure like the coiled nanotube is the result of these defects. For this, in the first part of this work, the coiled carbon nanotube structure is studied, a method for the designing of this structure is proposed, the geometric parameters are detailed and the structural coefficients are determined. Therefore, a procedure for moving from a graphene sheet to a coiled nanotube is developed. Then, the second part of this study represents an attempt to calculate the spring constants of the spiral carbon nanotube. Mechanical properties of this material are investigated by means of molecular structural mechanics (MSM) method in ANSYS finite element code. The model serves as a link between the computational chemistry and the solid mechanics by substituting discrete molecular structures, with an equivalent-structural model. A coiled carbon nanotube has been modeled on the nanoscale by one-dimensional elements (3D beam). The results show a considerable influence of structural parameters (diameter, chirality, pitch and defect position) on the coiled nanotube mechanical properties.

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“…The synthesis and characterization of coiled carbon nanotubes (CCNTs) were first reported two decades ago [1,2]. Since that time, a great deal of effort has been expended in improving the yield and quality of CCNTs [3][4][5][6][7] and in characterization of their mechanical properties [8][9][10][11][12]. Applications of CCNTs as components in composites [13][14][15][16][17][18][19] and devices [3,20,21] have emerged.…”

Section: Introductionmentioning

confidence: 99%

Empirical Correlation of the Morphology of Coiled Carbon Nanotubes with Their Response to Axial Compression

Barber¹,

Boyles²,

Ferri³

et al. 2014

Journal of Nanotechnology

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The mechanical response of thirteen different helical multi-walled carbon nanocoils to axial compression is reported. Each nanocoil was attached to the apex of a cantilever probe tip; its dimensions and orientation relative to the tip apex were determined with scanning electron microscopy. The atomic force microscope was employed to apply a cyclic axial load on the nanocoil. Its mechanical response was determined by simultaneous collection of the thermal resonance frequency, displacement, and oscillation amplitude of the cantilever-nanotube system in real time. Depending upon compression parameters, each coil underwent buckling, bending, and slip-stick motion. Characteristic features in the thermal resonance spectrum and in the force and oscillation amplitude curves for each of these responses to induced stress are presented. Following compression studies, the structure and morphology of each nanocoil were determined by transmission electron microscopy. The compression stiffness of each nanocoil was estimated from the resonant frequency of the cantilever at the point of contact with the substrate surface. From this value, the elastic modulus of the nanocoil was computed and correlated with the coiled carbon nanotube's morphology.

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Mechanical model and superelastic properties of carbon microcoils with circular cross-section

Cited by 11 publications

References 26 publications

Grating-structured metallic microsprings

Grating-structured metallic microsprings

Prediction of Mechanical Properties of Coiled Carbon Nanotubes by Molecular Structural Mechanics Based Finite Element Modelling

Empirical Correlation of the Morphology of Coiled Carbon Nanotubes with Their Response to Axial Compression

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