scholarly journals Dope-Dyeing of Polyvinyl Alcohol (PVA) Nanofibres with Remazol Yellow FG

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3043
Author(s):  
Fatirah Fadil ◽  
Farah Atiqah Adli ◽  
Nor Dalila Nor Affandi ◽  
Ahmad Mukifza Harun ◽  
Mohammad Khursheed Alam
Keyword(s):  
Fibre Diameter ◽  
Reactive Dye ◽  
Electrospinning Process ◽  
Poly Vinyl Alcohol ◽  
Jet Stability ◽  
Electrospun Nanofibres ◽  
Preliminary Study ◽  
Dyeing Method ◽  
Colour Appearance ◽  
Thermal Stability Of

The lack of aesthetic properties of electrospun nanofibres in terms of colour appearance is the drive in this preliminary study. This research is conducted to study the dyeing behaviour and colorimetric properties of electrospun nanofibres blended with Remazol Yellow FG reactive dye using dope-dyeing method via electrospinning process. This paper reports the colorimetric properties of dyed poly vinyl alcohol (PVA) nanofibres within the range of 2.5 wt.% to 12.5 wt.% dye content. The electrospinning parameters were fixed at the electrospinning distance of 10 cm, constant feed rate of 0.5 mL/h and applied voltage of 15 kV. The resulting impregnated dye of 10 wt.% exhibits acceptable colour difference of dyed PVA nanofibres, with a mean fibre diameter of 177.1 ± 11.5 nm. The SEM micrographs show the effect of dye content on morphology and fibre diameter upon the increment of dye used. Further increase of dye content adversely affects the jet stability during the electrospinning, resulting in macroscopic dropping phenomenon. The presence of all prominent peaks of Remazol dye in the PVA nanofibers was supported with FTIR analysis. The addition of dye into the nanofibres has resulted in the enhancement of thermal stability of the PVA as demonstrated by TGA analysis.

scholarly journals Experimental Validation of Upward Electrospinning Process

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Faissal Abdel-Hady ◽  
Abdulrahim Alzahrany ◽  
Mostafa Hamed
Keyword(s):  
Gravitational Force ◽  
Vacuum Chamber ◽  
Fibre Diameter ◽  
Solution Concentration ◽  
Electrospinning Process ◽  
Needle Size ◽  
Average Fibre Diameter ◽  
Jet Stability ◽  
Average Fibre

An experimental investigation has been carried out to validate the concept of a new upward electrospinning process in producing polymer nanofibres. The role of gravitational force in this concept is reversed from the conventional downward electrospinning. This inversion results in more stretching of the fibre, less bead formation, and jet stability. An experimental setup is built inside a vacuum chamber in order to eliminate the ambient effects. The effect of various parameters such as applied voltage, needle-collector distance, solution concentration, flow rate, and needle size, on average fibre diameter and beads formation, was investigated using scanning electron microscopy (SEM).

scholarly journals Development of Nervilia fordii Extract-Loaded Electrospun PVA/PVP Nanocomposite for Antioxidant Packaging

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1728
Author(s):  
Peng Wen ◽  
Teng-Gen Hu ◽  
Yan Wen ◽  
Ke-Er Li ◽  
Wei-Peng Qiu ◽  
...  
Keyword(s):  
Food Packaging ◽  
Thermo Gravimetric Analysis ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Poly Vinyl Alcohol ◽  
Total Phenolic ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Phenolic And Flavonoid ◽  
Thermal Stability Of

An ethyl acetate extract from of Nervilia fordii (NFE) with considerable suppression activity on lipid peroxidation (LPO) was first obtained with total phenolic and flavonoid contents and anti-LPO activity (IC50) of 86.67 ± 2.5 mg GAE/g sample, 334.56 ± 4.7 mg RE/g extract and 0.307 mg/mL, respectively. In order to improve its stability and expand its application in antioxidant packaging, the nano-encapsulation of NFE within poly(vinyl alcohol) (PVA) and polyvinyl(pyrrolidone) (PVP) bio-composite film was then successfully developed using electrospinning. SEM analysis revealed that the NFE-loaded fibers exhibited similar morphology to the neat PVA/PVP fibers with a bead-free and smooth morphology. The encapsulation efficiency of NFE was higher than 90% and the encapsulated NFE still retained its antioxidant capacity. Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD) analysis confirmed the successful encapsulation of NFE into fibers and their compatibility, and the thermal stability of which was also improved due to the intermolecular interaction demonstrated by thermo gravimetric analysis (TGA). The ability to preserve the fish oil’s oxidation and extend its shelf-life was also demonstrated, suggesting the obtained PVA/PVP/NFE fiber mat has the potential as a promising antioxidant food packaging material.

scholarly journals Optimization of The Electrospinning Process for Preparation of Nanofibers From Poly (Vinyl Alcohol) (PVA) and Chromolaena odorata L. Extrac (COE)

2020 ◽  
Vol 16 (1) ◽  
pp. 47-56
Author(s):  
I. Sriyanti ◽  
L. Marlina ◽  
J. Jauhari
Keyword(s):  
Wound Dressing ◽  
Fiber Diameter ◽  
Sem Analysis ◽  
Electrospinning Process ◽  
The Body ◽  
Poly Vinyl Alcohol ◽  
Therapeutic Effects ◽  
Important Process ◽  
Chromolaena Odorata ◽  
Solubility In Water

The Cromaloena odorata (COE) contains phenols, flavonoids, tannins, alkaloids, saponins, steroids that possess diverse therapeutic effects. However, COE has poor solubility in water and poor absorbtion in the body. Incorporation of COE in nanofiber system is a promising way to increase CEO solubility. One of the method to produce nanofiber is electrospinning. The electrospinning process there are three of the most important process parameters are applied flowrate, voltage and TCD. In this study we developed optimized condition for electrospinning process of polyvinyl alcohol (PVA)/CEO and their characterization. The Scanning electron microscopy (SEM) analysis showed that modification of flowrate and TCD did not affect the morphology of PVA and COE fiber. However fiber diameter decreased when lower flowrate, higher voltage was applied, and TCD. Fourier Transform Infrared (FTIR) study was conducted to identify possible intermolecular interaction between PVA/COE that has potential application as antimicrobial wound dressing.

Dual-Charge Nanofiber Mats Made of Chitosan(CS)/Poly(Vinyl Alcohol) (PVA) and Poly-(Acrylic Acid-Co-Maleic Acid) (PAMA)/PVA

2019 ◽  
Vol 819 ◽  
pp. 145-150
Author(s):  
Thapakorn Chareonying ◽  
Junnasir M. Sakilan ◽  
Theerasak Rojanarata ◽  
Prasopchai Patrojanasophon ◽  
Prasert Akkaramongkolporn ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Maleic Acid ◽  
Vinyl Alcohol ◽  
Electrospinning Process ◽  
Poly Vinyl Alcohol ◽  
Water Capacity ◽  
Ft Ir ◽  
Nanofiber Mats ◽  
Positively Charged ◽  
Poly Acrylic Acid

Nanofibers have been widely used for tissue engineering. Using charged polymers for the preparation of nanofibers can be useful for the loading of substances or macromolecules. Dual charge nanofiber mats are expected to be able to immobilize both positively charged and negatively charged substances in one versatile nanofiber mat. The purpose of this study was to prepare and characterize dual-charge nanofibers generated from poly (vinyl alcohol) (PVA)/poly-(acrylic acid-co-maleic acid) (PAMA) and chitosan (CS)/PVA. The polymer solutions of PAMA/PVA (1:1.63 w/w) and CS/PVA (1:2.33 w/w) were electrospun to form the nanofibers using dual-jet electrospinning process. The obtained dual-charge nanofibers were thermally crosslinked by leaving the nanofibers in the oven at 110-130 °C for 0.5, 1, 3, 5 h. The appearance of the nanofiber mat was characterized by a scanning electron microscope (SEM), and the diameter of nanofibers were determined by an image analysis software (J-micro vision®). The percentage water insolubilization and FT-IR spectra were also determined. The dual-size nanofiber mats with smooth and bead-free fibers were obtained. The diameter of the PAMA/PVA and CS/PVA fibers was 574.54 ± 142.98 nm and 225.69 ± 41.92 nm, respectively. The desirable temperature and time for the crosslink of the dual-charge nanofiber mats was 130 °C for 1 h which could provide a high insolubilization with water capacity of 93.22 ± 2.23%.

scholarly journals Kinetic models of swelling and thermal stability of silver/poly(vinyl alcohol)/chitosan/graphene hydrogels

2019 ◽  
Vol 77 ◽  
pp. 83-96 ◽  
Author(s):  
Katarina Nešović ◽  
Ana Janković ◽  
Aleksandra Perić-Grujić ◽  
Maja Vukašinović-Sekulić ◽  
Tamara Radetić ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Kinetic Models ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Thermal Stability Of

scholarly journals Dyeing Method and Properties of a Novel Blue Azo-Anthraquinone Reactive Dye on Cotton

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1334 ◽  
Author(s):  
Bin Shan ◽  
Wei Xiong ◽  
Shufen Zhang
Keyword(s):  
Sodium Carbonate ◽  
Reactive Dye ◽  
Light Fastness ◽  
Colored Cotton ◽  
Dyeing Method ◽  
Dipping Time

A novel blue azo-anthraquinone reactive dye was evaluated in the dyeing of cotton by using a dip–pad–steam process. Dyeing method and properties were examined in detail and the results showed that the dyeing method consisting of dye concentration of 25 g/L, sodium carbonate of 12 g/L, dipping time of 3 min and steaming time of 30 min was the most effective when a conventional “one-dip–one-nip” process was used. The fixation of the dyes on cotton could reach up to 93.4%, the wash and rub fastness both reached grade 4 above, and the light fastness reached grade 4–5 above. Such colored cotton showed very close colorimetric properties.

scholarly journals Recovery of cutting oil from wastewater by pervaporation process using natural clay modified PVA membrane

2019 ◽  
Vol 80 (12) ◽  
pp. 2404-2411
Author(s):  
D. Unlu
Keyword(s):  
Morphological Analysis ◽  
Poly Vinyl Alcohol ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Natural Clay ◽  
Feed Mixture ◽  
Feed Concentration ◽  
Feed Temperature ◽  
Thermal Stability Of ◽  
Clay Kaolin

Abstract In this study, the pervaporative dehydration of the cutting oil ‘diethylene glycol’ (DEG) through a hydrophilic PVA membrane was investigated at various operation temperatures in the range of 333–363 K with a feed mixture containing 0.5–2.0 wt% water. The pervaporation (PV) performance of poly(vinyl alcohol) (PVA) is enhanced by the addition of natural clay kaolin into the pristine membrane. The thermal stability of the membranes was analyzed by thermal gravimetric analysis (TGA). The morphological analysis of the membranes was performed by scanning electron microscope (SEM). Separation success was determined by calculation of flux, selectivity, and PSI. These values were investigated as functions of the clay amount, feed concentration and feed temperature. The obtained results show that PV is an effective method for recycling waste cutting oil from wastewater.

scholarly journals Proton Conductivity through Polybenzimidazole Composite Membranes Containing Silica Nanofiber Mats

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1182 ◽  
Author(s):  
Escorihuela ◽  
García-Bernabé ◽  
Montero ◽  
Andrio ◽  
Sahuquillo ◽  
...  
Keyword(s):  
Composite Membranes ◽  
Electrospinning Process ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Efficient Energy ◽  
The Past ◽  
Polar Groups ◽  
Nanofiber Mats ◽  
Thermal Stability Of ◽  
Energy Converting

The quest for sustainable and more efficient energy-converting devices has been the focus of researchers′ efforts in the past decades. In this study, SiO2 nanofiber mats were fabricated through an electrospinning process and later functionalized using silane chemistry to introduce different polar groups OH (neutral), SO3H (acidic) and NH2 (basic). The modified nanofiber mats were embedded in PBI to fabricate mixed matrix membranes. The incorporation of these nanofiber mats in the PBI matrix showed an improvement in the chemical and thermal stability of the composite membranes. Proton conduction measurements show that PBI composite membranes containing nanofiber mats with basic groups showed higher proton conductivities, reaching values as high as 4 mS·cm−1 at 200 C.

Fabricating high mechanical strength γ-Fe2O3 nanoparticles filled poly(vinyl alcohol) nanofiber using electrospinning process potentially for tissue engineering scaffold

2016 ◽  
Vol 32 (4) ◽  
pp. 411-428 ◽  
Author(s):  
Nor Hasrul Akhmal Ngadiman ◽  
Noordin Mohd Yusof ◽  
Ani Idris ◽  
Denni Kurniawan ◽  
Ehsan Fallahiarezoudar
Keyword(s):  
Tissue Engineering ◽  
Mechanical Strength ◽  
Young’S Modulus ◽  
Flow Rate ◽  
Vinyl Alcohol ◽  
Young's Modulus ◽  
Electrospinning Process ◽  
Poly Vinyl Alcohol ◽  
Tissue Engineering Scaffolds ◽  
Rotating Speed

The use of electrospinning has gained substantial interest in the development of tissue engineering scaffolds due to its ability to produce nanoscale fibers which can mimic the geometry of extracellular tissues. Besides geometry, mechanical property is one of the main elements to be considered when developing tissue engineering scaffolds. In this study, the electrospinning process parameter settings were varied in order to find the optimum setting which can produce electrospun nanofibrous mats with good mechanical properties. Maghemite (γ-Fe2O3) was mixed with poly(vinyl alcohol) and then electrospun to form nanofibers. The five input variable factors involved were nanoparticles content, voltage, flow rate, spinning distance, and rotating speed, while the response variable considered was Young’s modulus. The performance of electrospinning process was systematically screened and optimized using response surface methodology. This work truly demonstrated the sequential nature of designed experimentation. Additionally, the application of various designs of experiment techniques and concepts was also demonstrated. Results revealed that electrospun nanofibrous mats with maximum Young’s modulus (273.51 MPa) was obtained at optimum input settings: 9 v/v% nanoparticle content, 35 kV voltage, 2 mL/h volume flow rate, 8 cm spinning distance, and 3539 r/min of rotating speed. The model was verified successfully by performing confirmation experiments. The nanofibers characterization demonstrated that the nanoparticles were well dispersed inside the nanofibers, and it also showed that the presence of defects on the nanofibers can decrease their mechanical strength. The biocompatibility performance was also evaluated and it was proven that the presence of γ-Fe2O3 enhanced the cell viability and cell growth rate. The developed poly(vinyl alcohol)/γ-Fe2O3 electrospun nanofiber mat has a good potential for tissue engineering scaffolds.

Sign in / Sign up

Export Citation Format

Share Document