Temperature dependent compressive behavior of graphene mediated three-dimensional cellular assembly

Ghosh, Rituparna; Reddy, Siva K.; Sridhar, Supriya; Misra, Abha

doi:10.1016/j.carbon.2015.09.089

Cited by 17 publications

(16 citation statements)

References 43 publications

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“…This mechanical enhancement approves that because of the friction force between graphene nanosheets and polymer chains, the resistance of prepared scaffolds against applied force increases and finally the energy of force would be lost. The result was in agreement with past studies that illustrated energy loss occurs because of interfacial slippage between graphene and polymer chains. The amount of strain (%) was decreased when rGO‐Ag was incorporated into scaffolds.…”

Section: Discussionsupporting

confidence: 93%

Fabrication of graphene‐silver/polyurethane nanofibrous scaffolds for cardiac tissue engineering

Nazari

Azadi

Hatamie

et al. 2019

Polymers for Advanced Techs

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The graphene-based nanocomposites are considered as great candidates for enhancing electrical and mechanical properties of nonconductive scaffolds in cardiac tissue engineering. In this study, reduced graphene oxide-silver (rGO-Ag) nanocomposites(1 and 2 wt%) were synthesized and incorporated into polyurethane (PU) nanofibers via electrospinning technique. Next, the human cardiac progenitor cells (hCPCs) were seed on these scaffolds for in vitro studies. The rGO-Ag nanocomposites were studied by X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscope (TEM). After incorporation of rGO-Ag into PU nanofibers, the related characterizations were carried out including scanning electron microscope (SEM), TEM, water contact angle, and mechanical properties. Furthermore, PU and PU/nanocomposites scaffolds were used for in vitro studies, wherein hCPCs showed good cytocompatibility via 3-(4, 5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay and considerable attachment on the scaffold using SEM studies. Real-time polymerase chain reaction (PCR) and immunostaining studies confirmed the upregulation of cardiac specific genes including GATA-4, T-box 18 (TBX 18), cardiac troponin T (cTnT), and alphamyosin heavy chain (α-MHC) in the PU/rGO-Ag scaffolds in comparison with neat PU ones. Therefore, these nanofibrous rGO-Ag-reinforced PU scaffolds can be considered as suitable candidates in cardiac tissue engineering.

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Section: Discussionsupporting

confidence: 93%

Fabrication of graphene‐silver/polyurethane nanofibrous scaffolds for cardiac tissue engineering

Nazari

Azadi

Hatamie

et al. 2019

Polymers for Advanced Techs

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“…The hysteresis losses decrease in successive cycles due to the attainment of equilibrium among the polymer and filler or a cyclic softening effect in successive cycles . After the first few cycles, the polymer chains became softer, resulting in reduced stress, and hysteresis losses become almost zero after a certain number of cycles …”

Section: Resultsmentioning

confidence: 99%

Effects of thinner on RTV silicone rubber nanocomposites reinforced with GR and CNTs

Kumar

Lee

2017

Polymers for Advanced Techs

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The effects of thinner on rubber specimens with carbon nanotubes (CNTs) and graphitic nanofillers (GR) was studied for robotics applications. Rubber specimens were prepared by dispersing GR, CNTs and thinner in room temperature vulcanized (RTV) silicone rubber through solution mixing. Microscopic studies have confirmed occurrence of swelling in polymer chains due to migration of thinner. It results an increase in topological depth from 40 nm (no thinner) to 120 nm (40 phr of thinner). An elastic modulus of ~4.4 MPa (without thinner) was higher than 2.8 MPa (10 phr of thinner). At 100% strain, the lower dissipation losses of 110% (without thinner) and 70% (40 phr of thinner) were obtained. The resistance increases from 4.6 kΩ (without thinner) to 5.7 kΩ (10 phr of thinner). At 0.4‐mm‐thick elastomer slab, an actuation displacement of 0.81 mm (without thinner) was obtained which increased to 1.1 mm (60 phr of thinner). Thus, the thinner can be useful for easier processing, controlled stiffness, minimizing dissipation losses, increasing the actuation displacement and decreasing the cost of the device. Copyright © 2017 John Wiley & Sons, Ltd.

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“…The area bounded by these two trajectories quanties the amount of energy loss (g) during the deformation because of the viscoelastic nature of the foams. 46,47 The overall stress-strain plot can be subdivided into three distinct regions: (i) an elastic region at low strains (<40%) where the response is linear, (ii) a plateau region in between 40% and 60% strain, where the slope of the response curve increases gradually, and (iii) a densied state beyond 60% strain, where nonlinearity dominates with a steep rise in the amplitude of stress over small applied strain. The energy loss in a full cycle was measured by calculating the area of the stress-strain curve, which arises because of the frictional force between CNT bundles, arising due to the sliding during the compression.…”

Section: Resultsmentioning

confidence: 99%

“…In subsequent cycles, stress decreases gradually, then it becomes stationary and reaches a constant value, which is due to the cyclic soening of stress within the foams as observed in so tissues. 46,54 Cyclic soening generally occurs due to the CNT-CNT interaction, relocation and rearrangement within the structures. During the cyclic compression, long range inter-tube van der Waals interaction breaks in the initial cycles and aer a few cycles it gradually settles down.…”

Section: Paper Nanoscale Advancesmentioning

confidence: 99%

Tailored viscoelasticity of a polymer cellular structure through nanoscale entanglement of carbon nanotubes

Ghosh

Misra

2020

Nanoscale Adv.

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Temperature dependent compressive behavior of graphene mediated three-dimensional cellular assembly

Cited by 17 publications

References 43 publications

Fabrication of graphene‐silver/polyurethane nanofibrous scaffolds for cardiac tissue engineering

Fabrication of graphene‐silver/polyurethane nanofibrous scaffolds for cardiac tissue engineering

Effects of thinner on RTV silicone rubber nanocomposites reinforced with GR and CNTs

Tailored viscoelasticity of a polymer cellular structure through nanoscale entanglement of carbon nanotubes

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