A novel method of selecting solvents for polymer electrospinning

Luo, C. J.; Nangrejo, M.; Edirisinghe, Mohan

doi:10.1016/j.polymer.2010.01.031

Cited by 282 publications

(217 citation statements)

References 31 publications

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“…Koski et al [36] observed that higher molecular weight polymer-solvent systems of poly(vinyl alcohol) in water produced ribbon-like fibres. Luo et al [37] demonstrated the importance of the solvent choice and developed a spinnability-solubility map to enable the systematic selection of solvents creating electrospinnable binary solvent systems for polymethylsilsesquioxane.…”

Section: Consistency and Reproducibilitymentioning

confidence: 99%

Nanofibre fabrication in a temperature and humidity controlled environment for improved fibre consistency

2011

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Fabricating nanofibres with reproducible characteristics is an important demand in the membrane industry in order to establish commercial viability. In this study, the effect of controlled atmospheric conditions on electrospun cellulose acetate (CA) nanofibres was evaluated for temperatures ranging 17.5-32.5°C and relative humidity ranging 20-70%. CA solution (0.2 g/mL) in a solvent mixture of acetone/dimethylformamide/ethanol (2:2:1) was electrospun into nonwoven fibre mesh with the fibre diameter ranging from 150 nm to 1 lm. The resulting nanofibres were analysed by differential scanning calorimetry, showing a correlation of reducing melt enthalpy with increasing atmospheric temperature. The opposite was seen with increasing atmospheric humidity, which conferred increasing melt enthalpy. Analysis of scanning electron microscopy images provided a correlation of reducing average fibre diameter with increasing atmospheric temperature and increasing fibre diameter with increasing atmospheric humidity. These results correlate with the melt enthalpy results, suggesting that finer CA nanofibres infer a lower melt enthalpy. Together these studies provide strong evidence that the controlled atmospheric conditions affect the fibre diameter of the resulting electrospun nanofibres. A salient observation in this study was that increased humidity reduced the effect of fibre beading yielding a more consistent and therefore better quality of fibre. This has apparent implications for the reproducibility of nanofibre production and offers a new method of controlling fibre morphology. This study has highlighted the requirement to control atmospheric conditions during the electrospinning process to fabricate reproducible fibre mats.

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Section: Consistency and Reproducibilitymentioning

confidence: 99%

Nanofibre fabrication in a temperature and humidity controlled environment for improved fibre consistency

2011

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“…Several approaches have been developed to select polymer/solvent systems amenable to ES [287,288]. These approaches take into account the intrinsic physical properties of solvents and how they correlate to the intrinsic physical properties of polymer solutions.…”

Section: Polymers Amenable To Electrospinningmentioning

confidence: 99%

Electrospinning for nano- to mesoscale photonic structures

et al. 2016

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Abstract:The fabrication of photonic and electronic structures and devices has directed the manufacturing industry for the last 50 years. Currently, the majority of small-scale photonic devices are created by traditional microfabrication techniques that create features by processes such as lithography and electron or ion beam direct writing. Microfabrication techniques are often expensive and slow. In contrast, the use of electrospinning (ES) in the fabrication of microand nano-scale devices for the manipulation of photons and electrons provides a relatively simple and economic viable alternative. ES involves the delivery of a polymer solution to a capillary held at a high voltage relative to the fiber deposition surface. Electrostatic force developed between the collection plate and the polymer promotes fiber deposition onto the collection plate. Issues with ES fabrication exist primarily due to an instability region that exists between the capillary and collection plate and is characterized by chaotic motion of the depositing polymer fiber. Material limitations to ES also exist; not all polymers of interest are amenable to the ES process due to process dependencies on molecular weight and chain entanglement or incompatibility with other polymers and overall process compatibility. Passive and active electronic and photonic fibers fabricated through the ES have great potential for use in light generation and collection in optical and electronic structures/ devices. ES produces fiber devices that can be combined with inorganic, metallic, biological, or organic materials for novel device design. Synergistic material selection and postprocessing techniques are also utilized for broad-ranging applications of organic nanofibers that span from biological to electronic, photovoltaic, or photonic. As the ability to electrospin optically and/or electronically active materials in a controlled manner continues to improve, the complexity and diversity of devices fabricated from this process can be expected to grow rapidly and provide an alternative to traditional resource-intensive fabrication techniques.

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“…Selection of the appropriate solvent is fundamental for continuous microfiber production [53,54], with a relatively high polymer concentration being generally required to avoid the formation of droplets and electrospun beads, especially when a good solvent is chosen [55]. 1L6 has good solubility in most organic solvents (e.g.…”

Section: Electrospinning Of Poly(ester Urea) 1l6mentioning

confidence: 99%

New poly(ester urea) derived from l-leucine: Electrospun scaffolds loaded with antibacterial drugs and enzymes

Díaz

Valle

Tugushi

et al. 2015

Materials Science and Engineering: C

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Electrospun scaffolds from an amino acid containing poly(ester urea) (PEU) were developed as promising materials in the biomedical field and specifically in tissue engineering applications. The selected poly(ester urea) was obtained with a high yield and molecular weight by reaction of phosgene with a bis(α-aminoacyl)-α,ω-dioldiester monomer. The polymer having L-leucine, 1,6-hexanediol and carbonic acid units had a semicrystalline character and relatively high glass transition and melting temperatures. Furthermore it was highly soluble in most organic solvents, an interesting feature that facilitated the electrospinning process and the effective incorporation of drugs with bactericidal activity (e.g. biguanide derivatives such as clorhexidine and polyhexamethylenebiguanide) and enzymes (e.g. α-chymotrypsin) that accelerated the degradation process. Continuous micro/nanofibers were obtained under a wide range of processing conditions, being diameters of electrospun fibers dependent on the drug and solvent used. Poly(ester urea) samples were degradable in media containing lipases and proteinases but the degradation rate was highly dependent on the surface area, being specifically greater for scaffolds with respect to films. The high hydrophobicity of new scaffolds had repercussions on enzymatic degradability since different weight loss rates were found depending on how samples were exposed to the medium (e.g. forced or non-forced immersion). New scaffolds were biocompatible, as demonstrated by adhesion and proliferation assays performed with fibroblast and epithelial cells.

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A novel method of selecting solvents for polymer electrospinning

Cited by 282 publications

References 31 publications

Nanofibre fabrication in a temperature and humidity controlled environment for improved fibre consistency

Nanofibre fabrication in a temperature and humidity controlled environment for improved fibre consistency

Electrospinning for nano- to mesoscale photonic structures

New poly(ester urea) derived from l-leucine: Electrospun scaffolds loaded with antibacterial drugs and enzymes

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