Swelling and mechanical behaviors of carbon nanotube/poly(vinyl alcohol) hybrid hydrogels

Tong, Xin; Jiao, Zheng; Lu, Yancheng; Zhang, Zhenfang; Cheng, Hui‐Ming

doi:10.1016/j.matlet.2006.07.115

Cited by 159 publications

(92 citation statements)

References 16 publications

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“…However, the water uptake of CNT-100 was lower than that of CNT-50 hydrogels since the distribution of CNT was heterogeneously distributed throughout the hydrogel matrix. These results are confirmed with the results reported elsewhere [21]. The SEM images of PVA/PVP and CNT-based PVA/PVP hydrogels were demonstrated at Figure 1.…”

Section: Characterizationsupporting

confidence: 92%

Carbon nanotube based polyvinylalcohol-polyvinylpyrolidone nanocomposite hydrogels for controlled drug delivery applications

Irmak

2017

ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY a - Applied Sciences and Engineering

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Controlled drug release systems present a significant alternative to the conventional drug dosages providing drug release for prolonged time periods. Nanocomposite hydrogels offer an important potential for drug release with enhanced physicochemical properties. In this study, the preparation of carbon nanotube (CNT)-based Polyvinylalcohol-Polyvinylpyrolidone (PVA/PVP) nanocomposite hydrogels namely, CNT-25, CNT-50 and CNT-100 were succeedded via the freeze/thawing method with the addition of different amounts of CNT. The nanocomposite hydrogels were characterized by swelling tests, SEM, FTIR, DSC and BET measurements. It was determined that CNT-50 was the most suitable hydrogel for drug release studies having better morphological properties with homogenous distribution of CNT throughout the polymeric nanocomposite matrix. The release of 5-fluororacil (5-FU) as a model drug was investigated in-vitro. The release of 5-FU from CNT-based PVA/PVP nanocomposite hydrogels was exhibited controlled release for one week at pH 7.4. The amount of released 5-FU was effectively increased with the addition of CNT into the hydrogel matrix. Korsmeyer-Peppas model was well fitted for determining the release mechanism of 5-FU from CNT-based PVA/PVP nanocomposite hydrogels corresponding the combination of diffusion of the drug and the dissolution of polymer chains.

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Section: Characterizationsupporting

confidence: 92%

Carbon nanotube based polyvinylalcohol-polyvinylpyrolidone nanocomposite hydrogels for controlled drug delivery applications

Irmak

2017

ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY a - Applied Sciences and Engineering

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“…These include fibres [1], films [2] and hydrogels [3], the formation of which usually requires a surfactant or organic solvent [4] to suspend the highly insoluble carbon nanotubes [5]. The addition of surfactants has detrimental effects on the electrical properties of the final electrodes and whilst organic solvents provide an alternative dispersing media to surfactants these have limitations in terms of being inappropriate to use with biological systems [6].…”

Section: Introductionmentioning

confidence: 99%

Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance

Grosse

Champavert

Gambhir

et al. 2013

Carbon

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(2013). Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance. Carbon, 61 (September), 467-475. Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance AbstractAqueous dispersions of reduced graphene oxide (rGO) and multi walled carbon nanotubes (MWCNT) were fabricated through a modified chemical reduction method. The significant advantage of the method developed here is the omission of any stabilising compound or organic solvent to obtain stable rGO-MWCNT dispersions. Significantly biological entities, in this case the enzyme glucose oxidase (GOx), can be successfully incorporated into the dispersion. These dispersions were characterised using XPS, SEM, zeta potential and particle size measurements which showed that the dispersion stability is not sacrificed with the addition of GOx, and significantly, the electrical properties of the rGO and MWCNTs are maintained. In this study, rGO acts as an effective dispersing agent for MWCNTs and does not affect the solubility or electroactivity of the GOx. Bioelectrodes fabricated from these rGO-MWCNT-GOx dispersions were characterised electrochemically to test their feasibility in facilitating direct electron transfer (DET) from the redox centre of the enzyme to the electrode. The DET results showed that the specific catalytic current generated at an optimised rGO-MWCNT-GOx electrode was 72 uA/ug which is 144 times more efficient than other literature values for similar systems. The remarkable specific catalytic current can be attributed to the use of purified enzyme, the efficiency of charge transfer within the rGO-MWCNT composite and the ability of the electrode to facilitate direct electron transfer. Abstract:Aqueous dispersions of reduced Graphene Oxide (rGO) and multi walled carbon nanotubes (MWCNT) were fabricated through a modified chemical reduction method. The significant advantage of the method developed here is the omission of any stabilizing compound or organic solvent to obtain stable rGO-MWCNT dispersions. Significantly biological entities, in this case the enzyme glucose oxidase (GOx), can be successfully incorporated into the dispersion. These dispersions were characterised using XPS, SEM, zeta potential and particle size measurements which showed that the dispersion stability is not sacrificed with the addition of GOx, and significantly, the electrical properties of the rGO and MWCNTs are maintained. In this study, rGO acts as an effective dispersing agent for MWCNTs and does not affect the solubility or electroactivity of the GOx.Bioelectrodes fabricated from these rGO-MWCNT-GOx dispersions were characterised electrochemically to test their feasibility in facilitating direct electron transfer (DET) from the redox centre of the enzyme to the electrode. The DET results showed that the specific catalytic current generated at an optimized rGO-MWCNT-GOx electrode was 72 µA/µg GOx, which is 144 times m...

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“…[10,11] The nanocomposite hydrogels have achieved improved mechanical properties together with excellent swelling in polymer hydrogels. [12] Generally, reinforcing nanofillers act as decelerators of propagating cracks, and thus contribute to delaying the complete failure of the composite hydrogel.…”

mentioning

confidence: 99%

Nanocomposite Hydrogel with High Toughness for Bioactuators

et al. 2009

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Ferritin‐based nanofibrous hydrogels that demonstrate synergy between the ferritin protein and the synthetic polymer matrix are fabricated. The hybrid hydrogels showed enhanced mechanical properties and repeated expansion and contraction without showing severe creep during pH switching. The ferritin nanoparticles incorporated into the hydrogel nanofibers improved the actuation stability of a hydrogel actuator by acting as elastic nanosprings in a nanoscale polymer.

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Swelling and mechanical behaviors of carbon nanotube/poly(vinyl alcohol) hybrid hydrogels

Cited by 159 publications

References 16 publications

Carbon nanotube based polyvinylalcohol-polyvinylpyrolidone nanocomposite hydrogels for controlled drug delivery applications

Carbon nanotube based polyvinylalcohol-polyvinylpyrolidone nanocomposite hydrogels for controlled drug delivery applications

Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance

Nanocomposite Hydrogel with High Toughness for Bioactuators

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