Mechanical Behavior of Nanostructured Hybrids Based on Poly(Vinyl Alcohol)/Bioactive Glass Reinforced with Functionalized Carbon Nanotubes

Mansur, Herman S.; Pereira, Marivalda M.; Costa, Hermes S.

doi:10.1155/2012/386236

Cited by 7 publications

(1 citation statement)

References 34 publications

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“…The very dense or less porous microstructure of alginate could limit the diffusion of SWCNTs inside the matrix. Although the transport of SWCNTs into the PVA beads might be facilitated by the highly macroporous structure of the matrix, PVA may form a crystalline coating around CNTs (Mansur et al, 2012) which might reduce their antibacterial effect. Another possible reason for the similar effect of alginate and PVA entrapments is that the majority of the entrapped cells was in the inner part of the beads.…”

Section: Microscopymentioning

confidence: 99%

Mitigation of bactericidal effect of carbon nanotubes by cell entrapment

McEvoy

Khan

2016

Science of The Total Environment

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This study investigated the effects of the alginate and polyvinyl alcohol (PVA) entrapment on the viability of Escherichia coli cells exposed to single wall carbon nanotubes (SWCNTs) with a diameter of 1-2nm. Viability was examined using a galactosidase enzyme assay, LIVE/DEAD BacLight assay, and total ribonucleic acid quantity. Variables studied included SWCNT concentration (5, 10, 20, 50, 100, 200, 500, and 1000μg/ml), SWCNT length (0.5-2μm for short SWCNTs and 5-30μm for long SWCNTs), and initial bacterial concentration (6.5 log10 CFU and 9 log10 CFU per test). Results showed that both alginate and PVA entrapments mitigate the bactericidal effect of SWCNTs. At the highest SWCNT concentration tested (1000μg/ml), the viability of the cells relative to controls (systems with only E. coli, no SWCNTs), was 0-60% for free cells and 60-90% for alginate and PVA entrapped cells. The bactericidal effect depended on SWCNT type and concentration, and bacterial concentration. In general, long SWCNTs (5-30μm) caused significantly greater reductions in the viability of entrapped cells than the short SWCNTs except for the two highest SWCNT concentrations studied, 500 and 1000μg/ml. Microscopy showed that the entrapment matrices prevented SWCNTs from entering the beads. This study shows that bacterial entrapment is effective at limiting the bactericidal effect of SWCNTs.

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Section: Microscopymentioning

confidence: 99%

Mitigation of bactericidal effect of carbon nanotubes by cell entrapment

McEvoy

Khan

2016

Science of The Total Environment

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Electro spun nanomats strengthened glass fiber hybrid composites: Improved mechanical properties using continuous nanofibers

et al. 2019

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Hybrid multiscale fiber reinforced epoxy composite laminates were developed and characterized from woven glass fiber mats reinforced with nonwoven PAN nanofibers (diameters of 200 nm) produced via electrospinning. An electrospinning setup was designed and developed to produce continuous E‐spun nonwoven nanofiber (NWNF) mats, which were then used as interlaminar reinforcements for producing multiscale hybrid composites. A detailed study for producing E‐spun nanomats considering both solution and operation parameters was undertaken discussed and optimum spinning parameters were obtained. These parameters were used to produce the E‐spun NWNF mats, which were inserted into the interlaminar region of glass fiber reinforced epoxy laminates. The impact absorption energy, tensile strength, and flexural strength of the hybrid multiscale composites were found to increase with an increase in E‐spun NWNF mat weight fraction. These properties were compared to those of a conventional glass fiber composite laminates prepared from the neat epoxy resin with 32% glass fiber volume fraction. The effectiveness of the strengthening/toughening strategy formulated in this study indicates that the feasibility of using the E‐spun NWNF mat reinforcements for improving the mechanical properties of structured high‐performance composites. In addition, the present study provides motivation for the long‐term development of high‐strength high toughness bulk structural nanocomposites for broader engineering applications.

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Recent progress and perspectives on biofunctionalized CNT hybrid polymer nanocomposites

Mallakpour

Behranvand

2017

Hybrid Polymer Composite Materials

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Mechanical Behavior of Nanostructured Hybrids Based on Poly(Vinyl Alcohol)/Bioactive Glass Reinforced with Functionalized Carbon Nanotubes

Cited by 7 publications

References 34 publications

Mitigation of bactericidal effect of carbon nanotubes by cell entrapment

Mitigation of bactericidal effect of carbon nanotubes by cell entrapment

Electro spun nanomats strengthened glass fiber hybrid composites: Improved mechanical properties using continuous nanofibers

Recent progress and perspectives on biofunctionalized CNT hybrid polymer nanocomposites

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