Mechanical properties of chitosan/CNT microfibers obtained with improved dispersion

Spinks, Geoffrey M.; Shin, Su Ryon; Wallace, Gordon G.; Whitten, Philip G.; Kim, Sun I.; Kim, Seon Jeong

doi:10.1016/j.snb.2005.10.047

Cited by 117 publications

(69 citation statements)

References 34 publications

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“…For example, chitosan fibres with diameters larger than 10 mm are readily crosslinked by soaking them in a solution containing glutaric aldehyde. 8 However, the same procedure fails to crosslink fibres of the same material with diameters less than 100 nm. In contrast to microfibres, the dissolution of nanofibres when immersed in a crosslinking solution is so fast that they completely dissolve prior to the development of the minimum number of crosslinks required to form a gel.…”

Section: Introductionmentioning

confidence: 99%

Crosslinking neat ultrathin films and nanofibres of pH-responsive poly(acrylic acid) by UV radiation

et al. 2010

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Electrospun polyelectrolyte hydrogel nanofibres are being developed for many applications including artificial muscles, scaffolds for tissue engineering, wound dressings and controlled drug release. For electrospun polyelectrolytes, a post-spinning crosslinking process is necessary for producing a hydrogel. Typically, radiation or thermal crosslinking routines are employed that require multifunctional crosslinking molecules and crosslink reaction initiators (free radical producers). Here, ultraviolet subtype-C (UVC) radiation was employed to crosslink neat poly(acrylic acid) (PAA) nanofibres and films to different crosslink densities. Specific crosslink initiators or crosslinking molecules are not necessary in this fast and simple process providing an advantage for biological applications. Scanning probe microscopy was used for the first time to measure the dry and wet dimensions of hydrogel nanofibres. The diameters of the swollen fibres decrease monotonically with increasing UVC radiation time. The fibres could be reversibly swollen/contracted by treatment with solutions of varying pH, demonstrating their potential as artificial muscles. The surprising success of UVC radiation exposure to achieve chemical crosslinks without a specific initiator molecule exploits the ultrathin dimensions of the PAA samples and will not work with relatively thick samples. Crosslinking neat ultrathin films and nanofibres of pH-responsive poly(acrylic acid) by UV radiation Adrian Gestos, Philip G. Whitten, Geoffrey M. Spinks * and Gordon G. Wallace Electrospun polyelectrolyte hydrogel nanofibres are being developed for many applications including artificial muscles, scaffolds for tissue engineering, wound dressings and controlled drug release. For electrospun polyelectrolytes, a post-spinning crosslinking process is necessary for producing a hydrogel. Typically, radiation or thermal crosslinking routines are employed that require multifunctional crosslinking molecules and crosslink reaction initiators (free radical producers). Here, ultraviolet subtype-C (UVC) radiation was employed to crosslink neat poly(acrylic acid) (PAA) nanofibres and films to different crosslink densities. Specific crosslink initiators or crosslinking molecules are not necessary in this fast and simple process providing an advantage for biological applications. Scanning probe microscopy was used for the first time to measure the dry and wet dimensions of hydrogel nanofibres. The diameters of the swollen fibres decrease monotonically with increasing UVC radiation time. The fibres could be reversibly swollen/contracted by treatment with solutions of varying pH, demonstrating their potential as artificial muscles. The surprising success of UVC radiation exposure to achieve chemical crosslinks without a specific initiator molecule exploits the ultrathin dimensions of the PAA samples and will not work with relatively thick samples.

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Section: Introductionmentioning

confidence: 99%

Crosslinking neat ultrathin films and nanofibres of pH-responsive poly(acrylic acid) by UV radiation

et al. 2010

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“…MWCNTs can not show dissolution most of the features in environments containing water, to facilitate the dissolution of chitosan(CS) utilized in this study (Lu et al, 2005). In this way, the CS-MWCNT nanocomposite have shown very good agreement for potential applications , Spinks et al, 2006. In this way, the CS-MWCNT as a result of modification of amino groups on chitosan AuNP binding brought in a structure that allows for the convenience, the sensitivity of the system with a combination of both MWCNT and AuNPs were increased.…”

Section: Electrochemical Immunosensors Developed For the Detection Ofmentioning

confidence: 94%

Biosensors for Cancer Biomarkers

Uygun¹,

Sezgintürk²

2011

Biosensors - Emerging Materials and Applications

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“…Incorporation of a high concentration of CNTs in a polymer matrix without aggregation and localization of the CNTs is difficult because they tend to make a bundle, resulting in their being poor dispersed in the polymer matrix and the deterioration of the properties of the material [25,26]. In addition, increasing the concentration of filler in nanofiber is limited [27].…”

Section: Handspinningmentioning

confidence: 99%

Mechanical Force for Fabricating Nanofiber

Lee¹,

Kharaghani²,

Kim³

2018

Novel Aspects of Nanofibers

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Nanofiber has attracted increasing attention owing to its wide applications such as filtration, drug delivery, wound dressing, separator, etc. A lot of fabrication methods are developed in the last few decades, electrospinning method is the most frequently utilized method for producing nanofiber. However, electrospinning features a use of electrical field to produce nanofiber, which have obviously high production cost and a big burden on the environment. And several limitations are observed such as orientation of fibers and limited options of polymer and solvents, so many researchers try to develop more facile and more effective method for making nanofiber. In this chapter, recent developed fabrication methods, handspinning, direct writing, touch and brush spinning, are discussed and the advantages of each methods are described, respectively. They utilize a simple mechanical force instead of electrical force, which delivers great benefits to producing nanofiber such as orientation of fibers along with the force direction, reduction of every cost, availability of various options for selecting polymer and solvents, and a facility to design a pattern with high precision. Those innovative and novel methods will enable us to make functional nanofibers more effective than traditional methods; consequently, they will broaden the application of nanofibers.

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Mechanical properties of chitosan/CNT microfibers obtained with improved dispersion

Cited by 117 publications

References 34 publications

Crosslinking neat ultrathin films and nanofibres of pH-responsive poly(acrylic acid) by UV radiation

Crosslinking neat ultrathin films and nanofibres of pH-responsive poly(acrylic acid) by UV radiation

Biosensors for Cancer Biomarkers

Mechanical Force for Fabricating Nanofiber

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