Development of micro-scale hollow fiber ultrafiltration membranes

Halaui, Rafi; Moldavsky, A.; Cohen, Yachin; Semiat, Raphael; Zussman, Eyal

doi:10.1016/j.memsci.2011.06.011

Cited by 26 publications

(26 citation statements)

References 20 publications

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“…The parameters affecting electrospinning process and fibers' final properties can be broadly classified into: (a) properties of polymer solution, such as viscosity, surface tension, and electric conductivity, which are determined by polymer concentration, polymer molecular weight, polymer-solvent interaction parameter as well as solvent properties (Halaui et al 2011;Konwarh et al 2013); (b) process conditions, including applied voltage, distance between the needle tip and collector surface, feed flow rate, etc. (Halaui et al 2011;Konwarh et al 2013); (c) surrounding environment conditions: temperature, humidity and convective flow of air (De Vrieze et al 2009).…”

Section: Selection Of Operational Conditionsmentioning

confidence: 99%

“…(Halaui et al 2011;Konwarh et al 2013); (c) surrounding environment conditions: temperature, humidity and convective flow of air (De Vrieze et al 2009). All these parameters have been extensively investigated to optimize the electrospinning of CA fibers.…”

Section: Selection Of Operational Conditionsmentioning

confidence: 99%

“…During this process, solvent is evaporated, and the jet solidifies and forms fiber. Fibers deposit on the collector and form a nonwoven mesh (Reneker et al 2007;Halaui et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Investigation of nanofiber nonwoven meshes produced by electrospinning of cellulose nanocrystal suspensions in cellulose acetate solutions

2015

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The development of nonwoven meshes based on cellulose acetate (CA) reinforced by cellulose nanocrystals (CNC) is reported. The meshes were electrospun from 15 wt% CA (M n = 30,000) in dimethylacetamide/acetone (1:2, w/w) solutions with various concentrations of CNC dispersions. The investigated six levels of CNC dispersions in CA solutions were: 0, 0.075, 0.147, 0.225, 0.300 and 0.382 wt%, which corresponded to 0, 0.50, 1.00, 1.50, 1.99 and 2.55 wt% of CNC in solid fibers. The basis of the impact of CNC nano-particles on fiber diameter and morphology was explored by assessing their contributions to the viscosity, conductivity and homogeneity of CA/CNC solutions. CA/CNC nonwoven meshes spun from suspensions with 0.075 wt% CNC had best results in morphology and fiber uniformity. Additionally, mechanical properties of CA nonwoven meshes with five levels of CNC loading (0, 0.50, 1.00, 1.50 and 1.99 wt%) were examined. The CA nonwoven mesh with 0.50 wt% CNC showed best mechanical properties, and its elastic modulus (E) was improved to an average value of 1.68 GPa from 1.17 GPa of neat CA nanofiber nonwoven mesh. These improved meshes would have applications such as separation membranes, supports for catalysts and sensors, engineered tissues and other smart materials.

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Section: Selection Of Operational Conditionsmentioning

confidence: 99%

Section: Selection Of Operational Conditionsmentioning

confidence: 99%

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Investigation of nanofiber nonwoven meshes produced by electrospinning of cellulose nanocrystal suspensions in cellulose acetate solutions

2015

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“…13.9, the gaps between the parallel fibers in a bundle were clogged by glue in order to prevent streaming in, and all the liquid flowed through inside the nanofibers. Microscale UF membranes exhibited relatively high rejection values and considerable flux [88]. Besides UF filters made of electrospun hollow fibers, there are more and more multiple-layer UF, NF, and RO filters made of ENMs.…”

Section: Uf Nf and Ro Filtersmentioning

confidence: 99%

Electrospun Nanofibrous Membranes for Liquid Filtration

Wang

Hsiao

Chu

2014

Nanostructure Science and Technology

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Liquids are essential for most of the lives and activities on earth, where liquid filtration is an important tool to remove undesired suspended solids, emulsified particles, dissolved molecules, and ions from liquids by separating the permeate from the unwanted impurities through filters. Electrospun nanofibrous membranes (ENMs) have been developed as filtration media having unique advantages over traditional membranes, due to high porosity, interconnected pore structures, large surface-to-volume ratio with capability for chemical/physical functionalization, and cost-effectiveness. The new fibrous membrane format has been used in many applications, including filtration, (membrane) distillation, and pervaporation.

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“…Hollow polymeric nano/microstructures with cylindrical or spherical geometries are of special interest for use in encapsulation, [1][2][3] controlled release, [4][5][6] filtration, [7,8] nanoreactors, [9] and tissue microstructure mimics. [10][11][12][13] One important category is hollow microspheres, which currently are mainly fabricated using template and emulsion techniques.…”

Section: Introductionmentioning

confidence: 99%

Co-electrospraying of tumour cell mimicking hollow polymeric microspheres for diffusion magnetic resonance imaging

Zhou

McHugh

et al. 2019

Materials Science and Engineering: C

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Diffusion magnetic resonance imaging (dMRI) is considered as a useful tool to study solid tumours. However, the interpretation of dMRI signal and validation of quantitative measurements of is challenging. One way to address these challenges is by using a standard reference material that can mimic tumour cell microstructure. There is a growing interest in using hollow polymeric microspheres, mainly prepared by multiple steps, as mimics of cells in healthy and diseased tissue. The present work reports on tumour cell-mimicking materials composed of hollow microspheres for application as a standard material in dMRI. These microspheres were prepared via one-step co-electrospraying process. The shell material was poly(D,L-lactic-co-glycolic acid) (PLGA) polymers with different molecule weights and/or ratios of glycolic acid-to-lactic, while the core was polyethylene glycol (PEG) or ethylene glycol. The resultant co-electrosprayed products were characterised by optical microscopy, scanning electron microscopy (SEM) and synchrotron X-ray micro-CT. These products were found to have variable structures and morphologies, e.g. from spherical particles with/without surface hole, through beaded fibres to smooth fibres, which mainly depend on PLGA composition and core materials. Only the shell material of PLGA polymer with ester terminated, Mw 50,000-75,000 g mol-1, and lactide:glycolide 85:15 formed hollow microspheres via the co-electrospraying process using the core material of 8 wt.% PEG/chloroform as the core. A water-filled test object (or phantom) was designed and constructed from samples of the material generated from co-electrosprayed PLGA microspheres and tested on a 7 tesla MRI scanner. The preliminary MRI results provide evidence that hollow PLGA microspheres can restrict/hinder water diffusion as cells do in tumour tissue, implying that the phantom may be suitable for use as a quantitative validation and calibration tool for dMRI.

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Development of micro-scale hollow fiber ultrafiltration membranes

Cited by 26 publications

References 20 publications

Investigation of nanofiber nonwoven meshes produced by electrospinning of cellulose nanocrystal suspensions in cellulose acetate solutions

Investigation of nanofiber nonwoven meshes produced by electrospinning of cellulose nanocrystal suspensions in cellulose acetate solutions

Electrospun Nanofibrous Membranes for Liquid Filtration

Co-electrospraying of tumour cell mimicking hollow polymeric microspheres for diffusion magnetic resonance imaging

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