Mechanical properties of nanotube sheets: Alterations in joint morphology and achievable moduli in manufacturable materials

Berhan, L.; Yi, Yun–Bo; Sastry, Ann Marie; Muñoz, Edgar; Selvidge, Miles; Baughman, Ray H.

doi:10.1063/1.1687995

Cited by 158 publications

(145 citation statements)

References 37 publications

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“…Simulation also indicated that the FN deformation was mainly attributed to fiber segments with longer lengths. Using this model, Berhan et al 33,34 have recently considered the effective stiffness of nanotube sheets.…”

Section: Introductionmentioning

confidence: 99%

Elasticity of planar fiber networks

Dzenis

2005

Journal of Applied Physics

106

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A micromechanics model is proposed for the elasticity of planar fiber networks ͑FNs͒. The FN is created by random deposition of linearly elastic straight rods within a region. The rods are bonded rigidly at contacts. Under external in-plane loading, the FN deformation consists of fiber bending, elongation, and contraction. An effective constitutive relation for fiber network is developed by averaging the strain energy dissipated by all possible fiber deformations in all directions. Numerical calculations are performed to analyze the effects of fiber aspect ratio and fiber concentration on the effective stiffness of the planar random FN. Finite element analysis ͑FEA͒ is performed and compared with the theoretical predictions of the effective FN moduli at several fiber concentrations. FEA results are in good agreement with theoretical predictions. The present model can be used for the prediction of mechanical properties, scaling analysis, and optimization of fiber assemblies.

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Section: Introductionmentioning

confidence: 99%

Elasticity of planar fiber networks

Dzenis

2005

Journal of Applied Physics

106

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“…Different approaches to generate a representative structure have been proposed. Such methods include random beam networks as utilized in finite element analysis [27], random perturbations from a regular initial configuration [28], Boolean models parameterized with empirical morphological data [29], or the use of Delaunay triangulation to generate random fiber junction distributions [30]. For the application to buckypaper it is evidently desirable to create a representation of the material that is inherently stochastic.…”

Section: Buckypaper Assembly -In Silico Depositionmentioning

confidence: 99%

In silicoassembly and nanomechanical characterization of carbon nanotube buckypaper

Cranford

Buehler²

2010

Nanotechnology

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Carbon nanotube sheets or films, also known as "buckypaper", have been proposed for use in actuating, structural and filtration systems, based in part on their unique and robust mechanical properties. Computational modelling of such a fibrous nanostructure is hindered by both the random arrangement of the constituent elements, as well as the time and length scales accessible to atomisticlevel molecular dynamics modelling. Here we present a novel in silico assembly procedure based on a coarse-grain model of carbon nanotubes, used here to attain a representative mesoscopic buckypaper model that circumvents a need for probabilistic approaches. By variation in assembly parameters, including the initial nanotube density and ratio of nanotube type (single-and double-walled), the porosity of the resulting buckypaper can be varied threefold, from approximately 0.3 to 0.9. Further, through simulation of nanoindentation, the Young's modulus is shown to be tunable through manipulation of nanotube type and density over a range of approximately 0.2 to 3.1 GPa, in good agreement with experimental findings of the modulus of assembled carbon nanotube films. In addition to carbon nanotubes, the coarse-grain model and assembly process can be adapted for other fibrous nanostructures such as electrospun polymeric composites, high performance nonwoven ballistic materials, or fibrous protein aggregates, facilitating the development and characterization of novel nanomaterials and composites as well as the analysis of biological materials such as protein fiber films and bulk structures.

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“…Representation of MWCNT buckypaper and its microstructure observed by SEM [61] . properties of BPs prepared by vacuum filtration technique are relatively weak, leading to a Young's modulus and a tensile strength of 0.2-2 GPa and 2-33 MPa, respectively [68][69][70][71][72] . However, when polymer matrices are incorporated into BPs these properties display a significant improvement.…”

Section: Properties Of Bp/polymer Compositesmentioning

confidence: 99%

Carbon nanotube buckypaper reinforced polymer composites: a review

et al. 2017

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RbstractThis review provides valuable information about the general characteristics, processing conditions and physical properties of carbon nanotube buckypaper (BP) and its polymer composites. Vacuum filtration is the most common technique used for manufacturing BP, since the carbon nanotubes are dispersed in aqueous solution with the aid of surfactant. Previous works have reported that mechanical properties of BP prepared by vacuum filtration technique are relatively weak. On the other hand, the incorporation of polymer materials in those nanostructures revealed a significant improvement in their mechanical behavior, since the impregnation between matrix and BP is optimized. Electrical conductivity of BP/polymer composites can reach values as high as 2000 S/m, which are several orders of magnitude greater than traditional CNT/polymer composites. Also, BP can improve remarkably the thermal stability of polymer matrices, opening new perspectives to use this material in fire retardant applications.

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Mechanical properties of nanotube sheets: Alterations in joint morphology and achievable moduli in manufacturable materials

Cited by 158 publications

References 37 publications

Elasticity of planar fiber networks

Elasticity of planar fiber networks

In silicoassembly and nanomechanical characterization of carbon nanotube buckypaper

Carbon nanotube buckypaper reinforced polymer composites: a review

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