Electrospinning of agar/PVA aqueous solutions and its relation with rheological properties

Sousa, Ana; Souza, Hiléia K.S.; Uknalis, Joseph; Liu, Shih-Chuan; Gonçalves, M. P.; Liu, LinShu

doi:10.1016/j.carbpol.2014.08.074

Cited by 84 publications

(61 citation statements)

References 36 publications

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“…The PVA (average Mw = 89,000-98,000 Da, 99+% hydrolyzed) and commercial agar (A-7002, (C 12 H 18 O 9 )n) were both purchased from Sigma-Aldrich Co. (St. Louis, MO) and were the same as used in our electrospinning study focusing agar aqueous solutions [18]. This commercial agar sample was previously characterized in our lab [26] following standard procedures: viscosity-average molecular mass, M v ∼138 kDa; 3,6-anhydro-␣-L-galactose, 3,6-AG (%) ∼44; sulfate esters, SO 3 − (%) ∼1.6.…”

Section: Methodsmentioning

confidence: 99%

“…Knowing that nano and microfibers may afford performances and properties not seen in bulk materials [2,9,17], processing agar down to these scales could be a major breakthrough in the development of cutting-edge and highly functional biomaterials. Very recently, our group has taken the first steps to fabricate agar fibers by an electrospinning technique using water as solvent and polyvinyl alcohol (PVA) as co-blending polymer [18]. Agar containing PVA nanofibers were successfully produced using a tubeless spinneret attached inside the electrospinning chamber, set to operate at 50 • C. In this first approach however, the pure agar solution (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the non-volatile nature of the DES a coagulating ethanol bath was used to collect the fibers. The solvent bath was adapted to an electrospinning set-up used in a previous study where we had used a rotating cylindrical drum to collect agar/PVA nanofibers from aqueous solutions [18]. PVA was added to agar [24,25] to further improve agar-in-DES spinnability and produce composite fibers with tailorable morphology.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improving agar electrospinnability with choline-based deep eutectic solvents

Sousa

Souza

Uknalis

et al. 2015

International Journal of Biological Macromolecules

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improving agar electrospinnability with choline-based deep eutectic solvents

Sousa

Souza

Uknalis

et al. 2015

International Journal of Biological Macromolecules

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“…The influential parameters for electrostatic spinning include electric field, velocity, and the distance between the jet and the collector plate. The morphology of nanofibers is dependent on many factors, including the viscosity and conductivity of the polymer, environmental temperature, humidity, and air flux [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influential Factors on Formation of Nanofibers: Assessments of Electrostatic Spinning Parameters

Lin¹,

Lin²,

Lee³

et al. 2017

dtetr

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Nanofibers have a high specific surface area and a high porosity, and thus have been applied to many fields. Electrostatic spinning is one efficient and convenient method for the preparation of nanofibers. Two influential factors of the formation of nanofibers include processing parameters, such as voltages and velocity, and environmental factors, such as temperatures and humidity. This study uses a home-made electrospinning machine for the production. The morphology of the resulted nanofibers is examined in terms of the processing parameters, in order to provide f more feasible applications. The test results indicate that the viscosity of PVA electrospinning solution becomes dense as a result of the increasing temperatures. An increasing voltage changes the morphology of nanofibers from being smooth to rugged. Moreover, the diameter of nanofibers becomes smaller when the electrospinning distance is increased. *

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“…Each sample was loaded onto a 5 mL plastic syringe (initial sample volume of 3 mL) with an attached metallic needle (outer diameter × length = 0.7 mm × 32 mm and inner diameter = 0.390 mm) and placed in the spinneret. A scheme of the electrospinning set-up can be found elsewhere [26]. After several preliminary trials the electrospinning conditions were fixed at: 1 mL/h of flow rate (Note: value set in the syringe pump matching a real flow rate in the spinneret according to the company of 0.5 mL/h), 18 kV of applied voltage and a 10 cm distance from the tip of the needle to the collector.…”

Section: Electrospinningmentioning

confidence: 99%

Investigation on Photoluminescence Behaviour of 2, 3-Diphenylquinoxalin-6-Vinyl Benzaldehyde

Padma¹,

Sathiya²,

Guhanathan³

2017

SOJMSE

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Open Access Research Articlesuccess of electrospinning will rely on the proper optimization of several process parameters including flow rate of spinning solution, applied voltage and distance from the needle tip to the fiber collector, as well as relevant solution properties such as viscosity, viscoelasticity, concentration, electrical conductivity and surface tension [6,14,28].Food-grade hydrocolloids of commercial importance include polysaccharides (natural carbohydrate polymers) and proteins. Food-grade hydrocolloids, alone or combined, are widely used by the food industry to improve texture, processing conditions and the overall quality of food products [3,17]. Processing hydrocolloids by electrospinning is often challenging since most of these compounds show inadequate or limited spinnability [28].Starch and guar gum are two cost-attractive hydrocolloids often used together in food formulations [8]. Starch is present in plants as semi crystalline granules which shape, size, morphology and composition (e.g. amylose/amylopectin ratio) will depend on the starch source and cultivation conditions [3,13]. The granules are composed of amylose or (1→4)-linked α-glucopyranose, a linear macromolecule responsible for starch's gelling properties [18], and amylopectin or (1→4)-linked α-glucopyranose with α-(1→6) branch linkages, a highly branched component that may form very weak gels [20]. Guar Gum (GG) is extracted from Cyampsis tetragonolobus seeds [32] and is formed by linear chains of β-(1-4)-D-mannan with side units of α-(1-6) linked galactose [24].Electrospinning of starch and GG have been studied separately in a few papers. Lubambo et al. [16] found that fibers obtained from GG solutions were not uniform and had insoluble aggregates between fibers and within their structure. These authors concluded that sequential filtration steps were needed after GG purification to reduce the aggregates and improve fiber morphology. Pure starch fibers in turn, could only be obtained from Dimethyl Sulfoxide (DMSO) solutions using electro-wetspinning technology due to the non-volatile nature of the organic solvent [12,13]. Starch derivatives have also been electrospun from formic acid solutions [15,34] while composite fibers have been produced from blends of starch with non-food grade polymers such as polyvinyl alcohol [29] and polylactic acid [30]. AbstractIn this study, electrospun nanofibers were prepared for the first time, from aqueous blends of guar gum (GG) and corn starch with amylose contents of 27.8% (CS28) and 50% (CS50). The fiber morphology and fiber diameter sizes (FDS) were correlated with solution rheology. The spinning solutions were prepared with 3 wt% total concentration and mass ratios ranging from 4:1 to 1:4 GG/CS. The GG alone (3 wt%) was highly viscous and predominantly elastic (G'>G'') over the range of tested frequencies. Both CS were effective rheological modifiers that facilitated the electrospinning process. Partial substitution of GG by CS decreased solution viscosity and moved the elastic plateau (...

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Electrospinning of agar/PVA aqueous solutions and its relation with rheological properties

Cited by 84 publications

References 36 publications

Improving agar electrospinnability with choline-based deep eutectic solvents

Improving agar electrospinnability with choline-based deep eutectic solvents

Influential Factors on Formation of Nanofibers: Assessments of Electrostatic Spinning Parameters

Investigation on Photoluminescence Behaviour of 2, 3-Diphenylquinoxalin-6-Vinyl Benzaldehyde

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