Electrospinning of Cellulose Acetate Nanofiber Membrane Using Methyl Ethyl Ketone and N, N-Dimethylacetamide as Solvents

Publication date: Available online 13 September 2019Source: Materials Chemistry and PhysicsAuthor(s): Veereshgouda S. Naragund, P.K. PandaAbstractCellulose acetate (CA) nanofiber membrane was prepared by electrospinning method using solvent mixtures of methyl ethyl ketone (MEK) and N, N, - dimethylacetamide (DMAc) in different ratios (2:1, 1:1, 1:2) and also different concentration of CA (7-19%). MEK was selected in place of acetone due to its high boiling point, thereby, minimises the evaporation loss of the solvent enabling the longer duration of electrospinning. The morphology of electrospun nanofibers was observed by Scanning Electron Microscope (SEM). It was observed that cylindrical fibers formed at higher concentration of polymer with increase of DMAc. Fiber diameters were in the range of 40 to 500 nm with large diameters formed at higher polymer concentration. Contact angle measurement revealed that membranes have good wetting property. The water flux measurements of membranes were carried out under gravity. A water flux of 10,197 Lm-2h-1 was measured initially and was reduced subsequently to 365-200 Lm-2h-1. The membranes could be reused up to four times without rupture. The above experiments suggest that MEK and DMAc could be an alternate solvent system in addition to other systems.Graphical abstract
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research

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In this study, chiral mesoporous silica nanoparticles (CMSN) and enlarged chiral mesoporous silica nanoparticles (E-CMSN) with a particle size from 200 to 300 nm were synthesized. Fourier transform infrared spectrometer (FTIR), circular dichroism spectrum, scanning electron microscopy (SEM), transmission electron microscope (TEM), and nitrogen adsorption/desorption measurement were adopted to explore their characteristics. The results showed that the surface area, pore volume, and pore diameter of E-CMSN were higher than those of CMSN due to enlarged mesopores. Poorly water-soluble drug nimesulide (NMS) was taken as the mo...
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
Publication date: Available online 25 September 2019Source: Carbohydrate PolymersAuthor(s): Nina Forsman, Leena-Sisko Johansson, Hanna Koivula, Matilda Tuure, Pirjo Kääriäinen, Monika ÖsterbergAbstractEnvironmental benign cellulosic textiles are hampered by their tendency to absorb water, which restricts their use in functional clothing. Herein we describe a method to functionalize textile surfaces using thin, open coatings based on natural wax particles and natural polymers rendering cellulosic fabrics water-repellent while retaining their feel and breathability. The impact of curing temperature, catio...
Source: Carbohydrate Polymers - Category: Biomedical Science Source Type: research
CONCLUSION: This easy to use, standardised, semi-automated multimer analysis system can demonstrate the multimer profile of VWD patients, thus representing an additional laboratory tool for improved diagnosis, thereby facilitating appropriate patient management. PMID: 31508897 [PubMed - as supplied by publisher]
Source: International Journal of Laboratory Hematology - Category: Hematology Authors: Tags: Int J Lab Hematol Source Type: research
Publication date: 5 November 2019Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 580Author(s): Georgiana-Oana Turcan-Trofin, Mirela-Fernanda Zaltariov, Mihail Iacob, Vasile Tiron, Florin Branza, Carmen Racles, Maria CazacuAbstractCyclotri- and tetrasiloxanes having a methyl group and a carboxylic acid coupled through thioether bridge at each silicon atom were used to coordinate copper(II). The amphiphilic character conferred by the co-existence of the two moieties with opposite behaviour on the silicon atom gives the molecule the ability to form aggregates in solution. When copper salt is a...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
Publication date: Available online 16 August 2019Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Adilson Roberto Locali Pereira, Marília Gonçalves Cattelan, Vânia Regina NicolettiAbstractMicroencapsulation by spray drying of hydrophobic materials, such as pink pepper essential oil (Schinus terebinthifolia Raddi), relies on the efficient stabilization of the oil-in-water emulsion to be dried. Association colloids resulting from electrostatic interactions between proteins and polysaccharides are able to provide higher interfacial activity when compared to proteins alone....
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
Publication date: Available online 13 August 2019Source: Materials Today: ProceedingsAuthor(s): A.A. Voznesenskaya, A.V. Zhdanov, L.V. BelyaevAbstractIn this article are compared the physico-mechanical properties of the specimens surfaces with deposited carbon nanostructured coatings by using PVD methods (vacuum laser assisted deposition and the plasma ion-assisted deposition methods and finely dispersed and colloidal solutions deposition) on polyurethane substrate. Laser assisted deposition occurred using two laser systems: continuous wave and pulsed laser action. The surface properties of the base substrate and the carbo...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
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Source: IET Nanobiotechnology - Category: Nanotechnology Source Type: research
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Source: Journal of Materials Research and Technology - Category: Materials Science Source Type: research
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Source: Thermochimica Acta - Category: Chemistry Source Type: research
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Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research
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