Polyimide Nanofibers by “Green” Electrospinning via Aqueous Solution for Filtration Applications

Jiang, Shaohua; Hou, Haoqing; Agarwal, Seema; Greiner, Andreas

doi:10.1021/acssuschemeng.6b01031

Cited by 134 publications

(80 citation statements)

References 45 publications

(51 reference statements)

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“…In order to raise jet stability and eliminate the difference in viscosity between the core and the shell solutions, polyethylene oxide (PEO) was mixed to the cross‐linker solution, thus the viscosity of the mixture got closer to the viscosity of shell solution. Previous works indicate that PEO is an ideal candidate to improve the electrospinning process or serve as template to assist the formation of electrospun fibers from the unspinnable polymers . After optimization, it was found that 2 wt% PEO in the core solution could significantly increase the jet stability (the viscosity of this THD‐PEO mixture was ≈60 mPa s) and resulted in smooth fibers (PSI‐THD‐PEO) without beads (Figures g,h and a).…”

Section: Resultsmentioning

confidence: 91%

“…Previous works indicate that PEO is an ideal candidate to improve the electrospinning process or serve as template to assist the formation of electrospun fibers from the unspinnable polymers. [21] After optimization, it was found that 2 wt% PEO in the core solution could significantly increase the jet stability (the viscosity of this THD-PEO mixture was ≈60 mPa s) and resulted in smooth fibers (PSI-THD-PEO) without beads (Figures 1g,h and 2a). In addition, PEO also made the spinning process easier to control with less occasions of blockage of nozzle due to gelation (Figure 2b).…”

Section: Resultsmentioning

confidence: 98%

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Poly(amino acid)‐Based Gel Fibers with pH Responsivity by Coaxial Reactive Electrospinning

Molnár

Jedlovszky-Hajdú

Zrı́nyi

et al. 2017

Macromol. Rapid Commun.

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Electrospinning is a well-known technique for the preparation of scaffolds for biomedical applications. In this work, a continuous electrospinning method for gel fiber preparation is presented without a spinning window. As proof of concept, the preparation of poly(aspartic acid)-based hydrogel fibers and their properties are described by using poly(succinimide) as shell polymer and 2,2,4(2,4,4)-trimethyl-1,6-hexanediamine as cross-linker in the core of the nozzle. Cross-linking takes place as the two solutions get in contact at the tip of the nozzle. The impact of solution concentrations and feeding rates on fiber morphology, proof of the presence of cross-links as well as pH sensitivity after the transformation of the poly(succinimide)-based material to poly(aspartic acid) is presented.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 98%

Poly(amino acid)‐Based Gel Fibers with pH Responsivity by Coaxial Reactive Electrospinning

Molnár

Jedlovszky-Hajdú

Zrı́nyi

et al. 2017

Macromol. Rapid Commun.

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“…[43][44][45] When the electrostatic forces on the fluid (droplets) overcome the surface tension, the fluid droplet deforms to a conical shape called a Taylor cone and is accelerated to the collector in the form of nanofibers. [46][47][48][49] Electrospinning has recently been reported as an elegant approach for shaping various MOFs into hybrid materials with multiscale porosity and additional functionalities. Mostly polymer nanofibers are produced by electrospinning but also metal, ceramic-based nanofibers have been obtained.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

2019

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organic linkers with a periodic, nanoscaled structure and ultrahigh surface areas. With their tunable pore/cage sizes, flexible skeleton, and large surface-to-volume ratio, [13][14][15][16][17][18][19] MOFs have a large potential for a wide range of applications, including gas storage and separation, rechargeable batteries, supercapacitors, solar cells, nanoreactors, heterogeneous catalysis, or drug delivery. [20][21][22][23][24][25][26][27] Recently, significant efforts have been devoted to the design and synthesis of new MOFs structures and the investigation of their physical or chemical properties. MOFs are generally prepared as bulk form through traditional hydrothermal or solvothermal synthesis. [28][29][30][31] In order to expand the application range, suitable pathways for the structuring of MOF powders into a functional architecture or devices are highly desirable.Currently, intensive efforts are focusing on the structuring of MOFs at the mesoscopic/macroscopic scale for the use as coatings, membranes, or sophisticated architectures in specific devices and applications. [32][33][34][35] A major difference in the structuring of MOFs into complex shapes compared to inorganic microporous materials, such as zeolites or silica, is the fact that most inorganic binders cannot be used for MOFs as these binders usually require heat treatment. The intrinsic fragility of MOFs needs to be considered which is related to the inorganic/organic hybrid character of this class of materials and the resulting limited thermal and mechanical stability. Alternatively, a more effective way to structure MOFs is the combination with polymer materials. The polymer which acts as a binder improves the mechanical flexibility and ensures chemical stability. Numerous methods have been developed for structuring MOF-polymer compositions including hard or soft templates, spin-or dip-coating, spray-drying, printing, or lithography approaches. [36][37][38] The integration of MOFs into a polymer matrix can result in poor MOF-polymer dispersion and compatibility issues owing to the different physical and chemical properties for the two kinds of materials and this is a challenge in some applications, e.g., in MOF-based mixed matrix membranes for gas separation. [39][40][41][42] The poor interfacial compatibility would lead to agglomeration of MOF particles, causing the formation of nonselective voids between the MOFs particles and the polymer.Electrospinning is a fabrication method to produce continuous ultrafine fibers with diameters in the range of a few tens of nanometers to a few micrometers in the form of nonwoven mats, yarns, etc. The mechanism of electrospinning is based Herein, recent developments of metal-organic frameworks (MOFs) structured into nanofibers by electrospinning are summarized, including the fabrication, post-treatment via pyrolysis, properties, and use of the resulting MOF nanofiber architectures. The fabrication and post-treatment of the MOF nanofiber architectures are described systematically by two routes: i) the dire...

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“…The need for an approach that alleviates concerns related to safety, toxicology, and environmental problems has generated interest in “green” electrospinning processes. For some water‐soluble polymers, electrospinning can be performed in aqueous solutions, and a water‐resistant membrane is then achieved using an environmentally friendly crosslinker and a post‐manufactured treatment . Despite being water‐resistant, these membranes remain hydrophilic and can also swell in water.…”

Section: Introductionmentioning

confidence: 99%

“…For some water-soluble polymers, electrospinning can be performed in aqueous solutions, and a waterresistant membrane is then achieved using an environmentally friendly crosslinker and a post-manufactured treatment. [19,20] Despite being water-resistant, these membranes remain hydrophilic and can also swell in water. These membranes types have also been proposed for the filtration of contaminants in water; however, there are no systematic studies on how the swelling process modifies its performance.…”

Section: Introductionmentioning

confidence: 99%

Reversible swelling as a strategy in the development of smart membranes from electrospun polyvinyl alcohol nanofiber mats

Cimadoro

Goyanes

2020

Journal of Polymer Science

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This work presents an electrospun nanofibrous membrane for water treatment, designed to reduce its pores through polymer swelling to retain contaminants, and after that, reopening them for easy cleaning. It consists of a polyvinyl alcohol (PVA) mat crosslinked with a natural agent to avoid water solubility but allow a high swelling of its nanofibers. Then, when the membrane is brought into contact with water, a transitory state occurs during which nanofibers increase their diameter 68%, closing the pores between them. For studying the swelling reversal effect, distilled water filtering was used observing a decrease in the permeate flow over time until a steady state is reached. This phenomenon is explained by the closure of pores, and it is described with a fouling model widely used in the literature. Thanks to this decrease in the pore size, the membrane achieves a rejection rate much higher than conventional PVA electrospun membranes, being capable to retain 20 nm nanoparticles with a rejection rate up to 99%. Swelling is reversible through a simple drying process, which allows reopening the pores and cleaning the fouling easily. Both the membrane and its use strategy extend the capacity of electrospun mats in a sustainable way.

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Polyimide Nanofibers by “Green” Electrospinning via Aqueous Solution for Filtration Applications

Cited by 134 publications

References 45 publications

Poly(amino acid)‐Based Gel Fibers with pH Responsivity by Coaxial Reactive Electrospinning

Poly(amino acid)‐Based Gel Fibers with pH Responsivity by Coaxial Reactive Electrospinning

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

Reversible swelling as a strategy in the development of smart membranes from electrospun polyvinyl alcohol nanofiber mats

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