scholarly journals Activated release of hexanal and salicylaldehyde from imidazolidine precursors encapsulated in electrospun ethylcellulose-poly(ethylene oxide) fibers

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Caihua Shi ◽  
Apratim Jash ◽  
Loong-Tak Lim
Keyword(s):  
Ethylene Oxide ◽  
Fruits And Vegetables ◽  
Attenuated Total Reflection ◽  
Spectroscopy Analysis ◽  
Electrospinning Technique ◽  
Naturally Occurring ◽  
Free Surface Electrospinning ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Antimicrobial Volatiles

AbstractHexanal and salicylaldehyde are naturally-occurring antimicrobial volatiles from edible plants known for their efficacy for post-harvest preservation of fruits and vegetables. Due to their volatility and susceptibility to oxidation, these volatiles must be encapsulated within a carrier to control their release, especially when applied in modified atmnosphere and active packaging applications. In this study, salicylaldehyde precursor (SP; 1,3-dibenzylethane-2-hydroxyphenyl imidazolidine) and hexanal precursor (HP) were synthetized through a Schiff base reaction between these aldehydes and N,N’-dibenzylethane-1,2-diamine. The structure of SP was confirmed using nuclear magnetic resonance and attenuated total reflection-Fourier transform infrared (FTIR) spectroscopies. SP and HP, separately and in combinations, were encapsulated within ethylcellulose–poly(ethylene oxide) (EC–PEO) nonwoven membranes, using a free-surface electrospinning technique. Scanning electron microscopy showed that the morphology of the fibers varied substantially with SP and HP ratio. Specific interactions between SP and HP with the polymers were not detected from the FTIR spectroscopy analysis, suggesting that the precursors were mainly physically entrapped within the EC–PEO fiber matrix. Headspace gas chromatography showed that the release of hexanal and salicylaldehyde could be activated by contacting the precursor-containing electrospun nonwoven with an acidified agarose gel containing 0.003–0.3 M of citric acid. The delivery system can be promising for controlled release of hexanal and salicylaldehyde to extend the shelf-life of fruits and vegetables.

High-throughput Fabrication of Chitosan/Poly(ethylene oxide) Nanofibers by Modified Free Surface Electrospinning

2020 ◽  
Vol 21 (9) ◽  
pp. 1945-1955 ◽  
Author(s):  
Adnan Ahmed ◽  
Lan Xu ◽  
Jing Yin ◽  
Mingdi Wang ◽  
Fawad Khan ◽  
...  
Keyword(s):  
Free Surface ◽  
Ethylene Oxide ◽  
High Throughput ◽  
Free Surface Electrospinning ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Fabrication and characterization of poly(ethylene oxide) templated nickel oxide nanofibers for dye degradation

2015 ◽  
Vol 2 (1) ◽  
pp. 78-85 ◽  
Author(s):  
Deepika Malwal ◽  
P. Gopinath
Keyword(s):  
Ethylene Oxide ◽  
Nickel Oxide ◽  
Dye Degradation ◽  
Electrospinning Technique ◽  
One Dimensional ◽  
Degradation Processes ◽  
Poly Ethylene Oxide ◽  
Fabrication And Characterization ◽  
Poly Ethylene

In the present study, one dimensional nickel oxide (NiO) nanofibers were successfully fabricated using an inexpensive and simplistic electrospinning technique to evaluate their efficient applicability as a photocatalyst in dye degradation processes.

scholarly journals Incorporation of Fluorescent Dyes in Electrospun Chitosan/Poly(ethylene oxide)

2021 ◽  
Author(s):  
Cristiane Guellis ◽  
Ariane Rossin ◽  
Guilherme Bessegato ◽  
Douglas Dragunski ◽  
Reinaldo Bariccatti ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Acridine Orange ◽  
Fluorescent Dyes ◽  
Capillary Tube ◽  
Sodium Fluorescein ◽  
Scanning Calorimetry ◽  
Electrospinning Technique ◽  
Excitation Peak ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Polymeric films have been increasingly investigated due to the ease of miniaturization and integration in several sensor devices. Films obtained from the electrospinning technique have a controlled diameter and homogeneity, and substances can be incorporated into the polymeric network. Electrospinning fiber of chitosan (Ch) and poly(ethylene oxide) (PEO) was obtained from solutions prepared at different concentrations in acetic acid, and varying the distance and the voltage applied. The obtained films were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and UV-Visible specular reflectance spectra (UV-SRS). The best conditions for electrospinning were obtained for a 2% m/v (Ch + PEO) solution in the ratio 90:10% m/m (Ch:PEO), applied voltage of 18 kV, and 18 cm distance between the capillary tube and collector. Acridine orange, sodium fluorescein, and erythrosine fluorescence dyes were successfully incorporated into Ch:PEO films. The spectrofluorometric spectra of the films showed excitation and emission processes and the acridine orange film showed evidence of excimer formation by the presence of an excitation peak at 569 nm. Ch-PEO films with the incorporation of fluorescent dyes may well be used as flexible probes or sensors in colorimetric devices in biochemical applications.

scholarly journals Gel Polymer Electrolytes Based on Silica-Added Poly(ethylene oxide) Electrospun Membranes for Lithium Batteries

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 126 ◽  
Author(s):  
Maria Navarra ◽  
Lucia Lombardo ◽  
Pantaleone Bruni ◽  
Leonardo Morelli ◽  
Akiko Tsurumaki ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Polymer Electrolytes ◽  
Mechanical Stability ◽  
Electrochemical Impedance ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Gravimetric Analysis ◽  
Electrospinning Technique ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Solid polymer electrolytes, in the form of membranes, offering high chemical and mechanical stability, while maintaining good ionic conductivity, are envisaged as a possible solution to improve performances and safety in different lithium cell configurations. In this work, we designed and prepared systems formed using innovative nanocomposite polymer membranes, based on high molecular weight poly(ethylene oxide) (PEO) and silica nanopowders, produced by the electrospinning technique. These membranes were subsequently gelled with solutions based on aprotic ionic liquid, carbonate solvents, and lithium salt. The addition of polysulfide species to the electrolyte solution was also considered, in view of potential applications in lithium-sulfur cells. The morphology of the electrospun pristine membranes was evaluated using scanning electron microscopy. Stability and thermal properties of pristine and gelled systems were investigated uisng differential scanning calorimetry and thermal gravimetric analysis. Electrochemical impedance spectroscopy was used to determine the conductivity of both swelling solutions and gelled membranes, allowing insight into the ion transport mechanism within the proposed composite electrolytes.

Ordered exfoliated silicate platelets architecture: hydrogen bonded poly(acrylic acid)–poly(ethylene oxide)/Na–montmorillonite complex nanofibrous membranes prepared by electrospinning technique

RSC Advances ◽  
2014 ◽  
Vol 4 (77) ◽  
pp. 40892-40897 ◽  
Author(s):  
Zahed Shami ◽  
Naser Sharifi-Sanjani ◽  
Bafrin Khanyghma ◽  
Sadegh Farjpour ◽  
Azam Fotouhi
Keyword(s):  
Acrylic Acid ◽  
Ethylene Oxide ◽  
Electrospinning Technique ◽  
Poly Ethylene Oxide ◽  
Nanofibrous Membranes ◽  
Clay Platelets ◽  
Poly Ethylene ◽  
First Time ◽  
Poly Acrylic Acid ◽  
Hydrogen Bonded

Well-ordered/dispersed exfoliated clay platelets aligned along as-electrospun PAA–PEO/Na–MMT composite nanofibrous membranes were synthesized successfully for the first time.

The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

1971 ◽  
Vol 29 ◽  
pp. 76-77
Author(s):  
C. E. Cluthe ◽  
G. G. Cocks
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Parallel Plate ◽  
Average Molecular Weight ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Nitrogen Gas ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants

2003 ◽  
Vol 68 (10) ◽  
pp. 2019-2031 ◽  
Author(s):  
Markéta Zukalová ◽  
Jiří Rathouský ◽  
Arnošt Zukal
Keyword(s):  
Mesoporous Silica ◽  
Ethylene Oxide ◽  
Sodium Metasilicate ◽  
Spherical Particles ◽  
Structure Directing Agent ◽  
Inorganic Species ◽  
Poly Ethylene Oxide ◽  
Acidic Conditions ◽  
Poly Ethylene ◽  
Hydrolysis Of

A new procedure has been developed, which is based on homogeneous precipitation of organized mesoporous silica from an aqueous solution of sodium metasilicate and a nonionic poly(ethylene oxide) surfactant serving as a structure-directing agent. The decrease in pH, which induces the polycondensation of silica, is achieved by hydrolysis of ethyl acetate. Owing to the complexation of Na+ cations by poly(ethylene oxide) segments, assembling of the mesostructure appears to occur under electrostatic control by the S0Na+I- pathway, where S0 and I- are surfactant and inorganic species, respectively. As the complexation of Na+ cations causes extended conformation of poly(ethylene oxide) segments, the pore size and pore volume of organized mesoporous silica increase in comparison with materials prepared under neutral or acidic conditions. The assembling of particles can be fully separated from their solidification, which results in the formation of highly regular spherical particles of mesoporous silica.

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