Nonlinear viscoelasticity of freestanding and polymer-anchored vertically aligned carbon nanotube foams

Lattanzi, Ludovica; Raney, Jordan R.; Nardo, Luigi De; Misra, Abha; Daraio, Chiara

doi:10.1063/1.3699184

Cited by 16 publications

(15 citation statements)

References 38 publications

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“…The study of new technologies to process advanced materials has been actively promoted (26,27), from fundamental to applied materials science, in different fields (28)(29)(30)(31). Namely, the study on SMP foams has been originally proposed by Hayashi and Sokolowski (10,(32)(33)(34), and their applications in medical devices by the latter in cooperation with Prof. Yahia (8)(9)(10)35).…”

Section: Discussionmentioning

confidence: 99%

Preparation and Characterization of Shape Memory Polymer Scaffolds via Solvent Casting/Particulate Leaching

Nardo

Bertoldi

Cigada

et al. 2012

Journal of Applied Biomaterials & Functional Materials

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Purpose: Porous Shape Memory Polymers (SMPs) are ideal candidates for the fabrication of defect fillers, able to support\ud tissue regeneration via minimally invasive approaches. In this regard, control of pore size, shape and interconnection is required\ud to achieve adequate nutrient transport and cell ingrowth. Here, we assessed the feasibility of the preparation of SMP\ud porous structures and characterized their chemico-physical properties and in vitro cell response.\ud Methods: SMP scaffolds were obtained via solvent casting/particulate leaching of gelatin microspheres, prepared via oil/water\ud emulsion. A solution of commercial polyether-urethane (MM-4520, Mitsubishi Heavy Industries) was cast on compacted\ud microspheres and leached-off after polymer solvent evaporation. The obtained structures were characterized in terms of\ud morphology (SEM and micro-CT), thermo-mechanical properties (DMTA), shape recovery behavior in compression mode,\ud and in vitro cytocompatibility (MG63 Osteoblast-like cell line).\ud Results: The fabrication process enabled easy control of scaffold morphology, pore size, and pore shape by varying the gelatin\ud microsphere morphology. Homogeneous spherical and interconnected pores have been achieved together with the preservation\ud of shape memory ability, with recovery rate up to 90%. Regardless of pore dimensions, MG63 cells were observed\ud adhering and spreading onto the inner surface of the scaffolds obtained for up to seven days of static in vitro tests.\ud Conclusions: A new class of SMP porous structures has been obtained and tested in vitro: according to these preliminary\ud results reported, SMP scaffolds can be further exploited in the design of a new class of implantable devices

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Section: Discussionmentioning

confidence: 99%

Preparation and Characterization of Shape Memory Polymer Scaffolds via Solvent Casting/Particulate Leaching

Nardo

Bertoldi

Cigada

et al. 2012

Journal of Applied Biomaterials & Functional Materials

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“…At very low rates (10 −8 -10 −6 s −1 ), creep and stress relaxation experiments subjected to prolonged loading conditions have been used to study the viscoelastic and long-term behavior [8,9]. At quasi-static rates (10 −4 -10°s −1 ) tensile, compression, indentation and shear experiments have been adapted to understand complex deformation responses of hierarchical structured materials [10].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Technique for the Dynamic Characterization of Soft Complex Materials

Thevamaran

Daraio

2014

Exp Mech

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We describe an experimental technique to study the dynamic behavior of complex soft materials, based on high-speed microscopic imaging and direct measurements of dynamic forces and deformations. The setup includes high sensitivity dynamic displacement measurements based on geometric moiré interferometry and high-speed imaging for in-situ, full-field visualization of the complex micro-scale dynamic deformations. The method allows extracting dynamic stress-strain profiles both from the moiré interferometry and from the high-speed microscopic imaging. We discuss the advantages of using these two complementing components concurrently. We use this technique to study the dynamic response of vertically aligned carbon nanotube foams subjected to impact loadings at variable deformation rates. The same technique can be used to study other micro-structured materials and complex hierarchical structures.

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“…They found their composites to have high energy absorption and cushioning properties. Lattanzi et al [21] have formed a sandwich composite out of a thin PDMS layer and bucky paper with a CNT forest in the middle. They found a decrease in the stress level with time and an increase in stress with increasing strain.…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation in intercalated carbon nanotube forests with metal layers

Boddu

Brenner

2016

Appl. Phys. A

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Vertically aligned carbon nanotube (CNT) forests were synthesized to study their quasi-static mechanical properties in a layered configuration with metallization. The top and bottom surfaces of CNT forests were metalized with Ag, Fe, and In using paste, sputtering, and thermal evaporation, respectively. Stacks of one, two, and three layers of these forests were assembled and compressed to measure their mechanical properties. The samples were strain limited to 0.7, and the results indicate that energy dissipation is approximately linear with respect to the number of layers and relatively independent of metal type. The energy per unit volume was approximately the same for all samples. Successive stacking of CNT forests reduces local buckling events, which is enhanced with a thick Ag deposition on the CNT forest surface. Young's modulus was also observed to increase as the number of layers was increased. These results are useful in the design of composite materials for high energy absorption and high stiffness applications.

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Nonlinear viscoelasticity of freestanding and polymer-anchored vertically aligned carbon nanotube foams

Cited by 16 publications

References 38 publications

Preparation and Characterization of Shape Memory Polymer Scaffolds via Solvent Casting/Particulate Leaching

Preparation and Characterization of Shape Memory Polymer Scaffolds via Solvent Casting/Particulate Leaching

An Experimental Technique for the Dynamic Characterization of Soft Complex Materials

Energy dissipation in intercalated carbon nanotube forests with metal layers

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