The Effect of Processing Parameters Onpoly (Lactic Acid)/Poly(Ethylene Oxide)Bicomponentultrafine Fibersby Co-Electrospinning

2013 ◽  
Vol 701 ◽  
pp. 254-258 ◽  
Author(s):  
Suttipan Pavasupree ◽  
Kawee Srikulkit ◽  
Ratthapol Rangkupan
Keyword(s):  
Lactic Acid ◽  
Flow Rate ◽  
Applied Voltage ◽  
Water Soluble ◽  
Flow Rate Ratio ◽  
Poly Lactic Acid ◽  
Solution Flow Rate ◽  
Electrospinning Technique ◽  
Solution Flow ◽  
Water Soluble Polymer

Poly (lactic acid) (PLA)/polyethylene oxide (PEO) bicomponent fibers werefabricated by co-electrospinning technique in a side by side configuration. Effect of PEO concentration, PLA and PEO solution flow rate and an applied voltage on formation, size and morphology of the fibers were investigated. The results showed that the fibers size increased with increasing PEO concentration, PEO flow rate ratio and applied voltage. The composition of the fibers was confirmed by IR spectrum. Additionally, by pairing PEO, which is a water soluble polymer, with PLA, follow by PEO phase removal in water, a C-shaped ultrafine fiber was prepared.

Electrospinning of Polycaprolactone in Dichloromethane/Dimethylformamide Solvent System

2013 ◽  
Vol 849 ◽  
pp. 337-342 ◽  
Author(s):  
Narissara Kulpreechanan ◽  
Tanom Bunaprasert ◽  
Ratthapol Rangkupan
Keyword(s):  
Flow Rate ◽  
Applied Voltage ◽  
Mixed Solvent ◽  
Solution Concentration ◽  
Solvent System ◽  
Fiber Formation ◽  
Solution Flow Rate ◽  
Fiber Morphology ◽  
Solution Flow ◽  
Fiber Size

Electrospinning of polycaprolactone (PCL) in a mixed solvent of dichloromethane (DCM)/dimethylformamide (DMF) with 1:1 volumetic mixing ratio was studied. The effects of solution concentration (5-30 %w/v), applied voltage (10-25 kV), solution flow rate (0.1-2.0 mL/h) and collecting distance (10, 20 cm) on fiber formation and morphology were investigated. The size of PCL fibers obtained were in the range of 10s nm-2.6 μm with either bead on string or smooth fiber morphology. In this study, the solution concentration strongly affected fiber size exponentially. The fiber size also increased with an increase in solution flow rate. The applied voltage and the collecting distance have no or minimal effect on PCL fiber size.

Preparation and Characterization of PLA-PEO Bicomponent Fibers with Porous-Smooth Surface by Co-Electrospinning

2013 ◽  
Vol 849 ◽  
pp. 115-120 ◽  
Author(s):  
Suttipan Pavasupree ◽  
Kawee Srikulkit ◽  
Ratthapol Rangkupan
Keyword(s):  
Flow Rate ◽  
Rate Ratio ◽  
Smooth Surface ◽  
Selective Dissolution ◽  
Flow Rate Ratio ◽  
Poly Lactic Acid ◽  
Size Change ◽  
Electrospinning Technique ◽  
Bicomponent Fibers ◽  
Fiber Size

Poly (lactic acid) (PLA)/polyethylene oxide (PEO) bicomponent fibers with porous and smooth surface on different side of the same fibers were fabricated by co-electrospinning technique. Specific solvent systems were used deliberately to induce pore formation on PLA phase. The results showed that the porous-smooth surface fibers were obtained using PLA-PEO flow rate ratio of 0.75:0.25 to 0.25:0.75 ml/hr. While, Fiber size decreased with decrease in PEO concentration and PEO flow rate ratio, the applied voltage had small effect on fiber size change. After PEO phase removal via selective dissolution with water, the C-shape PLA fibers with porous surface was generated.

scholarly journals Electrospun Ocimum Sanctum Loaded Fibres With Potential Biomedical Applications – Periodontal Therapeutic Perspective

2018 ◽  
Vol 11 (3) ◽  
pp. 1731-1736 ◽  
Author(s):  
Priyanka Mariam George ◽  
Sheeja S Varghese
Keyword(s):  
Vinyl Acetate ◽  
Flow Rate ◽  
Applied Voltage ◽  
Cost Effective ◽  
Sem Analysis ◽  
Ocimum Sanctum ◽  
Solution Flow Rate ◽  
Sem Images ◽  
Solution Flow ◽  
Therapeutic Perspective

Electro spinning is a technique that is simple, unique, cost effective and versatile. The nanofibers obtained are to be non woven with high tunable porosity and a large surface area. The parameters decide the morphology of the resultant fibers, such as tip to collector distance, viscosity of the solution, diameter of the needle. By controlling or tuning the parameters it is possible to obtain or fabricate fibers for the desired function. To establish ideal spinning parameters so as to formulate a nanoscale resorbable system for local periodontal therapy based on electro spinning of Ocimum sanctum(Tulsi) loaded resorbable Poly vinyl acetate (PVA) fibers. Ocimum sanctum (Tulsi) extract prepared was incorporated by electro spinning (HOLAMRC’S HO-SPLF4) into Poly vinyl acetate (PVA) at different concentrations (1-20%w/w). Electrospinning was performed at different paremeters: applied voltage of 13,15,20,55Kv.Tip- to- collector distance was set at 12, 22, 16-18.5cm .solution flow rate was 500µl/hr0.8ml/hr,1ml/hr,1.5ml/hr, tip diameter was 12mm,22m,0.91mm,.4mm. volume of the solutions were 2.5, 1ml, duration was of 5 or 3 hours. The fibers obtained were subjected to SEM analysis. Electro spinning of 10% concentration tulsi done under the following conditions resulted in formation of uniform and beadless fibers. Applied voltage of 13kV, tip- to- collector distance at 12cm, solution flow rate of 500µl/hr, tip diameter of 12mm, volume of 2.5ml and duration of 5hrs. SEM images revealed that the textures of all resultant samples were homogenous and free of heterogeneities or artefacts’ The study revealed that Ocimum sanctum (Tulsi) 10wt% incorporated into PVA can be electrospun into nonfibers at an applied voltage of 13kV, tip- to- collector distance of 12cm, solution flow rate at 500µl/hr, and a tip diameter of 12mm.

Effect of Applied Voltage on Polymer Aggregation in Electrospraying of Thermoplastic Polymer

2012 ◽  
Vol 535-537 ◽  
pp. 2522-2525 ◽  
Author(s):  
Amit Jadhav ◽  
Li Jing Wang ◽  
Rajiv Padhye
Keyword(s):  
Process Parameters ◽  
Flow Rate ◽  
Applied Voltage ◽  
Solution Concentration ◽  
Solution Flow Rate ◽  
Thermoplastic Polymer ◽  
Solution Flow ◽  
Polymer Liquids ◽  
Polymeric Solutions ◽  
Uniform Droplets

In an electrospraying process, the polymer solution interacts with the electric field. Charged polymeric solutions causing polymer liquids to move, break into drops or spray into fine droplets. Electrospraying has the ability to generate very small & uniform droplets of polymeric solution. It is envisaged that electrospraying is a promising technology to coat a polymer on surface at submicron range. The polymer aggregation is important while coating. The process parameters including applied voltage, nozzle-collector distance, solution flow rate, and solution concentration play an important role in polymer droplets aggregation on surface. This research paper investigates the effect of applied voltage on aggregation of polymer droplets.

Utilization of Waste of Enzymes Biomass as Biosorbent for the Removal of Dyes from Aqueous Solution in Batch and Fluidized Bed Column

2020 ◽  
Vol 71 (1) ◽  
pp. 1-12
Author(s):  
Salman H. Abbas ◽  
Younis M. Younis ◽  
Mohammed K. Hussain ◽  
Firas Hashim Kamar ◽  
Gheorghe Nechifor ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Particle Size ◽  
Adsorption Capacity ◽  
Fluidized Bed ◽  
Flow Rate ◽  
Fungal Biomass ◽  
Solution Flow Rate ◽  
Maximum Adsorption Capacity ◽  
Solution Flow

The biosorption performance of both batch and liquid-solid fluidized bed operations of dead fungal biomass type (Agaricusbisporus ) for removal of methylene blue from aqueous solution was investigated. In batch system, the adsorption capacity and removal efficiency of dead fungal biomass were evaluated. In fluidized bed system, the experiments were conducted to study the effects of important parameters such as particle size (701-1400�m), initial dye concentration(10-100 mg/L), bed depth (5-15 cm) and solution flow rate (5-20 ml/min) on breakthrough curves. In batch method, the experimental data was modeled using several models (Langmuir,Freundlich, Temkin and Dubinin-Radushkviechmodels) to study equilibrium isotherms, the experimental data followed Langmuir model and the results showed that the maximum adsorption capacity obtained was (28.90, 24.15, 21.23 mg/g) at mean particle size (0.786, 0.935, 1.280 mm) respectively. In Fluidized-bed method, the results show that the total ion uptake and the overall capacity will be decreased with increasing flow rate and increased with increasing initial concentrations, bed depth and decreasing particle size.

scholarly journals Pellet Softening Process for the Removal of the Groundwater Hardness; Modelling and Experimentation

2019 ◽  
Vol 12 (3) ◽  
pp. 135-143 ◽  
Author(s):  
Fatin Abdul_kareem Ashoor ◽  
Amer D. Zmat ◽  
Muthanna H. AlDahhan
Keyword(s):  
Calcium Carbonate ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Solution Flow Rate ◽  
Pellet Size ◽  
Solution Flow ◽  
Bed Height ◽  
Naoh Solution ◽  
Softening Process ◽  
Calcium And Magnesium Ions

A lab scale pellet reactor (PR) was designed and fabricated to carry out extensive investigations on the removal efficiency of the hardness of groundwater.  The groundwater of 2200 – 2600 mg/L hardness was collected from Abdulla Ibnalhassan wells area located at the west desert of Al-Shinafiyah district (70 km to the southwest of Al-Dewaniyah city, Iraq). Both hydrodynamic parameters of the pellet reactor (porosity and fluidized bed height) and the parameters of calcium carbonate crystallization process (calcium carbonate equilibrium, pellet size, and density) were modeled and compared with the experimental results of the lab scale pellet reactor. The comparison showed that fair agreement between modeled and measured results was observed. The removal efficiency of both calcium and magnesium ions were 62.5-99% and 83-99% respectively. The removal efficiency was found to be strongly dependent on pH and the ratio of NaOH solution flow rate to the groundwater flow rate in the pellet reactor.

Biophysical properties of electrospun chitosan-grafted poly(lactic acid) nanofibrous scaffolds loaded with chondroitin sulfate and silver nanoparticles

2021 ◽  
pp. 088532822110464
Author(s):  
Alexandre F Júnior ◽  
Charlene A Ribeiro ◽  
Maria E Leyva ◽  
Paulo S Marques ◽  
Carlos R J Soares ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Lactic Acid ◽  
Proton Nuclear Magnetic Resonance ◽  
Poly Lactic Acid ◽  
Fibroblast Cells ◽  
Biophysical Properties ◽  
Electrospinning Technique ◽  
Average Pore ◽  
H Nmr ◽  
Substitution Degree

The aim of this work was to study the biophysical properties of the chitosan-grafted poly(lactic acid) (CH-g-PLA) nanofibers loaded with silver nanoparticles (AgNPs) and chondroitin-4-sulfate (C4S). The electrospun CH-g-PLA:AgNP:C4S nanofibers were manufactured using the electrospinning technique. The microstructure of the CH-g-PLA:AgNP:C4S nanofibers was investigated by proton nuclear magnetic resonance (1H-NMR), scanning electron microscopy (SEM), UV-Visible spectroscopy (UV-Vis), X-ray diffraction (XRD), and Fourier transform infrared (ATR-FTIR) spectroscopy. ATR-FTIR and 1H-NMR confirm the CH grafting successfully by PLA with a substitution degree of 33.4%. The SEM measurement results indicated apparently smooth nanofibers having a diameter range of 340 ± 18 nm with porosity of 89 ± 3.08% and an average pore area of 0.27 μm2. UV-Vis and XRD suggest that silver nanoparticles with the size distribution of 30 nm were successfully incorporated into the electrospun nanofibers. The water contact angle of 12.8 ± 2.7° reveals the hydrophilic nature of the CH-g-PLA:AgNP:C4S nanofibers has been improved by C4S. The electrospun CH-g-PLA:AgNP:C4S nanofibers are found to release ions Ag+ at a concentration level capable of rendering an antimicrobial efficacy. Gram-positive bacteria ( S.aureus) were more sensitive to CH-g-PLA:AgNP:C4S than Gram-negative bacteria ( E. coli). The electrospun CH-g-PLA:AgNP:C4S nanofibers exhibited no cytotoxicity to the L-929 fibroblast cells, suggesting cytocompatibility. Fluorescence microscopy demonstrated that C4S promotes the adhesion and proliferation of fibroblast cells onto electrospun CH-g-PLA:AgNP:C4S nanofibers.

Sign in / Sign up

Export Citation Format

Share Document