Fabrication and Characterization of Chitosan-Ethylenediaminetetraacetic Acid/Polyvinyl Alcohol Blend Electrospun Nanofibers

2011 ◽  
Vol 194-196 ◽  
pp. 648-651 ◽  
Author(s):  
Natthan Charernsriwilaiwat ◽  
Praneet Opanasopit ◽  
Theerasak Rojanarata ◽  
Tanasait Ngawhirunpat
Keyword(s):  
Polyvinyl Alcohol ◽  
Ethylenediaminetetraacetic Acid ◽  
Electrospun Fiber ◽  
High Surface ◽  
Weight Ratio ◽  
Average Diameter ◽  
High Porosity ◽  
Sem Images ◽  
Fiber Mats ◽  
Small Pore

Electrospinning is a technique use to fabricate ultrafine fibers with diameters in the nanometer range. The electrospun fiber mats have high potentials for many applications, due to their high surface area to volume, high porosity and small pore size. In this study, chitosan-ethylenediaminetetraacetic acid (CS-EDTA)/polyvinyl alcohol (PVA) blend nanofibers were successfully prepared using electrospinning techniques without organic solvent. CS was dissolved in EDTA aqueous solution and then blended with PVA solution at various weight ratios. Physicochemical properties of CS-EDTA/PVA solution such as viscosity, conductivity and surface tension were investigated. The morphology and diameter of the electrospun fiber mats were analyzed by using scanning electron microscopy (SEM). The composite structure was characterized by differential scanning calorimetry (DSC) and fourier transform infrared spectroscopy (FT-IR). SEM images showed that the morphology and diameter of the nanofibers were mainly affected by the weight ratio of the blend. Nanofibers were obtained when the CS-EDTA content was less than 50%wt. The average diameter of the nanofibers was 119-223 nm, and this average diameter decreased with increasing CS-EDTA content. In summary, these CS electrospun nanofiber mats may be proper for the drug delivery or wound dressing application.

Preparation of Chitosan-Thiamine Pyrophosphate/Polyvinyl Alcohol Blend Electrospun Nanofibers

2012 ◽  
Vol 506 ◽  
pp. 118-121 ◽  
Author(s):  
Natthan Charernsriwilaiwat ◽  
Theerasak Rojanarata ◽  
Tanasait Ngawhirunpat ◽  
Praneet Opanasopit
Keyword(s):  
Polyvinyl Alcohol ◽  
Electrospun Fiber ◽  
Weight Ratio ◽  
Electrospun Nanofibers ◽  
Average Diameter ◽  
Thiamine Pyrophosphate ◽  
Scanning Calorimetry ◽  
Fiber Mats ◽  
Transdermal Drug Delivery Systems ◽  
Nanofiber Mats

Electrospinning of chitosan (CS) has been interested due to the excellent properties of CS such as biocompatibility, biodegradability, antibacterial and non toxic. In this study, chitosan-thiamine pyrophosphate (CS-TPP)/polyvinyl alcohol (PVA) blend nanofibers were prepared using electrospinning techniques without acidic and organic solvent. CS was dissolved with TPP aqueous solution and then blended with PVA solution at various weight ratios. Physicochemical properties of CS-TPP/PVA solution such as viscosity, conductivity and surface tension were evaluated. The morphology and diameter of the electrospun fiber mats were investigated by using scanning electron microscopy (SEM). The chemical structure was characterized by Fourier Transform Infrared (FT-IR) spectroscopy and Differential Scanning Calorimetry (DSC). The morphology and diameter of the nanofibers were mainly affected by the weight ratio of the blend polymers. Nanofibers were obtained when the CS-TPP content was less than 50 % wt. The average diameter of the nanofibers was 99.91-216.42 nm, and the fiber diameter decreased with increasing CS-TPP content. Cytotoxicity tests in human fibroblast cells showed that the fibers had low toxic to the cells. In conclusion, these CS electrospun nanofiber mats can be applied for the wound dressing or transdermal drug delivery systems.

Optimization of Chitosan/PVA Concentration in Fabricating Nanofibers Membrane and its Prospect as Air Filtration

2017 ◽  
Vol 901 ◽  
pp. 20-25 ◽  
Author(s):  
Himayatus Shalihah ◽  
Ahmad Kusumaatmaja ◽  
Ari Dwi Nugraheni ◽  
Kuwat Triyana
Keyword(s):  
Electrospun Fiber ◽  
Chemical Compounds ◽  
Average Diameter ◽  
Air Filtration ◽  
Maximum Condition ◽  
Chemical Absorption ◽  
Fiber Mats ◽  
Before And After ◽  
Porosity Percentage ◽  
Scanning Electron

Chitosan/polyvinyl-alcohol (Chitosan/PVA) based nanofibers were successfully produced using electrospinning machine and investigated their application as air filtration. Firstly, 2 wt% chitosan was dissolved to 1 wt% acetic acid followed by mixing with PVA solution to produce fiber mats or membrane. Secondly, the morphology and diameter of the electrospun fiber were analyzed by using a scanning electron microscopy (SEM), while the chemical compounds in the membrane were characterized using Fourier transform infrared spectroscopy (FTIR). It was found that the conductivity of solution increased by the concentration of chitosan. Meanwhile, the average diameter and percentage of porosity decreased due to the upsurge of the conductivity of the solution. The average diameter of PVA 13 wt% was and the percentage of porosity were 50.32%. The maximum condition of chitosan/PVA was obtained at 20/80 wt%, in line with the average of fiber diameters and the percentage of porosity were 25.32%. Physicochemical properties of chitosan/PVA solution, such as conductivity, morphology, and chemical absorption were investigated before and after the air filtration. The porosity percentage of PVA 13wt% after air filtration changed to 35.85% and the percentage of porosity of chitosan/PVA 20/80 became 25.32%. Remarkable absorption peaks of PVA 13wt% exhibited and - shifted after the air filtration test, it was indicating that functional groups had been reduced. The chemical absorption of chitosan/PVA 20/80 wt% showed at the the region then disappeared after the air filtration test.

scholarly journals REVERSE MICROEMULSION OF IGEPAL Co-720 SYSTEM AS MICROREACTOR FOR CdS SYNTHESIS

2016 ◽  
Vol 10 (2) ◽  
pp. 157
Author(s):  
Fitria Rahmawati ◽  
Indah Rizki Fitriani ◽  
Abu Masykur
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
Particle Diameter ◽  
Weight Ratio ◽  
Average Diameter ◽  
Reverse Microemulsion ◽  
X Ray Diffraction ◽  
Regular Form ◽  
Gap Energy ◽  
Hydrophilic Lipophilic Balance

<p>A Research on CdS synthesis in reverse microemulsion of Igepal CO-720 system has been conducted at various weight ratio of water to surfactant. Igepal CO-720 naturally forms  oil  in  water  (o/w)  emulsion  type  due  to  its  high  HLB  (Hydrophilic -Lipophilic Balance)  value.  Therefore,  in  this  research  the  Igepal  CO-720  system  was  inversed  into water  in  oil  (w/o)  system  before  it  was  used  as  microreactor  for  CdS  synthesis.  As comparison,  a  system  of  AOT  (Aerosol  OT;  sodium  bis (2-ethylhexyl)  sulfosuccinate) which  is  naturally  w/o  system  was  also  used  as  microreactor  for  CdS  synthesis.  The prepared  CdS  was  analyzed  by  X-ray  diffraction  for  crystal  identification,  scanning electron microscope for morphological analysis, UV-Vis for absorption edge determination and  photoelectrochemical  testing  for  photoactivity.  The  results  show that the  Igepal  CO -720  system can  be  inverted  into  w/o  system  and  can  be  used  as  microreactor  for  CdS synthesis. The prepared CdS is in nanosize with the average diameter of 2.517  ±  0.014 nm and  the  average  gap  energy  of  3.805  ±  0.178  eV.  The  prepared  CdS  in  Igepal  CO-720 system has less regular form in comparison with morphology of the prepared CdS in AOT system. As the ω  values decreases the particle diameter decreases, the gap energy increases and the %  IPCE increases. It indicates that high surfactant concentration allows small size micelles  formation  and  produced  smaller  CdS  particle  that  has  high  surface  area  and therefore  provide  higher  photocatalytic  activity  which  was  indicated  by  high  value  of  its % IPCE.</p>

Electrospun Polyvinylpyrrolidone as a Carrier for Leaves Extracts of Anredera cordifolia (Ten.) Steenis

2015 ◽  
Vol 827 ◽  
pp. 91-94 ◽  
Author(s):  
Ade Yeti Nuryantini ◽  
Dhewa Edikresnha ◽  
Muhammad Miftahul Munir ◽  
Khairurrijal
Keyword(s):  
Drug Release ◽  
Polymer Matrix ◽  
Flow Rate ◽  
Leaf Extract ◽  
Electrospun Fiber ◽  
Synthesis Process ◽  
High Porosity ◽  
Fiber Mats ◽  
Collector System ◽  
Electrospinning Method

Nanofibers produced by electrospinning method have high porosity, large surface area, long size, and their dimensions are ranging from nanometers to micrometers. The synthesis process was straightforward, uncomplicated and it can be processed from various type of materials and the nanofibers can be used as drug release. The polymer matrix acts as a carrier of other materials that will be spun. The purpose of this study was to to prepare electrospun fiber mats and to incorporate extracts from the leaves of Anredera cordifolia (Ten.) Steenis plant (Binahong). Polyvinylpyrrolidone (PVP) was used as a carrier matrix. Binahong leaf extract was added to a solution of PVP. The solution was then electrospun using a single nozzle and drum collector system under condition of voltage 12.5 kV, nozzle collector distance of 12 cm, and flow rate 10 μl /minute. In this study, the composite of Binahong extract and PVP solution was succesfully made into nanofiber.

Electrospinning of 100% Carboxymethyl Chitosan Nanofibers

2014 ◽  
Vol 9 (1) ◽  
pp. 155892501400900 ◽  
Author(s):  
Negar Sohofi ◽  
Hossein Tavanai ◽  
Mohammad Morshed ◽  
Amir Abdolmaleki
Keyword(s):  
Surface Tension ◽  
Polyvinyl Alcohol ◽  
Polyethylene Oxide ◽  
Trifluoroacetic Acid ◽  
Moisture Absorption ◽  
Average Diameter ◽  
Biological Properties ◽  
High Specific Surface Area ◽  
Carboxymethyl Chitosan ◽  
High Porosity

Carboxymethyl chitosan (CMC), one of the most important chitosan derivatives, is synthesized by alkalization of chitosan, followed by carboxymethylation. CMC has higher moisture absorption and moisture retention, higher chelating and sorption abilities as well as better biological properties than chitosan. Polymeric nanofibrous mats produced through electrospinning have high specific surface area and high porosity which are beneficial for various applications. Up to present time, the electrospinning of CMC has only been possible by the addition of polymers such as polyvinyl alcohol or polyethylene oxide. The present study focuses on the electrospinning of 100% CMC. It was found that the solution of CMC (5–6%) in trifluoroacetic acid (TFA) was electrospinnable, producing nanofibers containing some beads. However, adding dichloromethane (DCM) to TFA made the electrospinning uniform, and bead-free CMC nanofibers with an average diameter of 260 nm was possible. This study shows that viscosity and surface tension of the electrospinning solution of CMC plays an important role in making CMC solution electrospinnable.

scholarly journals Post-electrospinning crosslinking of guar/polyvinyl alcohol membrane

2016 ◽  
Vol 20 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Jingjing Shi ◽  
Enlong Yang
Keyword(s):  
Heat Treatment ◽  
Citric Acid ◽  
Polyvinyl Alcohol ◽  
Guar Gum ◽  
Weight Ratio ◽  
Average Diameter ◽  
Alcohol Solution ◽  
Electrospun Nanofiber ◽  
Ft Ir ◽  
Nanofiber Membranes

College of Material and Textile Engineering, Jiaxing University, Jiaxing, China The present study reports post-electrospinning crosslinking of guar/polyvinyl alcohol (PVA)/citric acid nanofiber membranes by heat treatment. Porous, interconnected nonwoven nanofiber membranes (average diameter 194?23 nm) were electrospun from a homogeneous blend of 1wt% guar gum and 8wt% polyvinyl alcohol solution (3:7 weight ratio) containing 5 wt% (by the total weight of the solution) citric acid. The electrospun nanofiber membranes were then cured at 140 oC for 2 h. The crosslinked nanofiber membranes were insoluble in water, while the non-crosslinked membranes dissolved instantaneously. FT-IR spectrum investigates that crosslinking of guar/PVA occurred through esterfication reaction during heat treatment.

scholarly journals REVERSE MICROEMULSION OF IGEPAL Co-720 SYSTEM AS MICROREACTOR FOR CdS SYNTHESIS

2016 ◽  
Vol 10 (2) ◽  
pp. 157
Author(s):  
Fitria Rahmawati ◽  
Indah Rizki Fitriani ◽  
Abu Masykur
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
Particle Diameter ◽  
Weight Ratio ◽  
Average Diameter ◽  
Reverse Microemulsion ◽  
X Ray Diffraction ◽  
Regular Form ◽  
Gap Energy ◽  
Hydrophilic Lipophilic Balance

<p>A Research on CdS synthesis in reverse microemulsion of Igepal CO-720 system has been conducted at various weight ratio of water to surfactant. Igepal CO-720 naturally forms  oil  in  water  (o/w)  emulsion  type  due  to  its  high  HLB  (Hydrophilic -Lipophilic Balance)  value.  Therefore,  in  this  research  the  Igepal  CO-720  system  was  inversed  into water  in  oil  (w/o)  system  before  it  was  used  as  microreactor  for  CdS  synthesis.  As comparison,  a  system  of  AOT  (Aerosol  OT;  sodium  bis (2-ethylhexyl)  sulfosuccinate) which  is  naturally  w/o  system  was  also  used  as  microreactor  for  CdS  synthesis.  The prepared  CdS  was  analyzed  by  X-ray  diffraction  for  crystal  identification,  scanning electron microscope for morphological analysis, UV-Vis for absorption edge determination and  photoelectrochemical  testing  for  photoactivity.  The  results  show that the  Igepal  CO -720  system can  be  inverted  into  w/o  system  and  can  be  used  as  microreactor  for  CdS synthesis. The prepared CdS is in nanosize with the average diameter of 2.517  ±  0.014 nm and  the  average  gap  energy  of  3.805  ±  0.178  eV.  The  prepared  CdS  in  Igepal  CO-720 system has less regular form in comparison with morphology of the prepared CdS in AOT system. As the ω  values decreases the particle diameter decreases, the gap energy increases and the %  IPCE increases. It indicates that high surfactant concentration allows small size micelles  formation  and  produced  smaller  CdS  particle  that  has  high  surface  area  and therefore  provide  higher  photocatalytic  activity  which  was  indicated  by  high  value  of  its % IPCE.</p>

scholarly journals Efficiency of Wood-Dust of Dalbergia sisoo as Low-Cost Adsorbent for Rhodamine-B Dye Removal

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2217
Author(s):  
Dibyashree Shrestha
Keyword(s):  
Aqueous Solution ◽  
Rhodamine B ◽  
Dye Removal ◽  
High Surface ◽  
Wood Dust ◽  
High Porosity ◽  
Wood Powder ◽  
Sem Images ◽  
Bet Analysis ◽  
Rhodamine B Dye

Wood-dust of Dalbergia sisoo (Sisau) derived activated carbon (AC) was successfully tested as an adsorbent material for the removal of rhodamine B dye from an aqueous solution. The AC was prepared in a laboratory by the carbonization of wood powder of Dalbergia sisoo at 400 °C in an inert atmosphere of N2, which was chemically activated with H3PO4. Several instrumental techniques have been employed to characterize the as-prepared AC (Db-s). Thermogravimetric analysis (TGA)/differential scanning colorimetry (DSC) confirmed that 400 °C was an appropriate temperature for the carbonization of raw wood powder. The FTIR spectra clearly confirmed the presence of oxygenated functional groups such as hydroxyl (–OH), aldehyde/ketone (–CHO/C=O) and ether (C–O–C) at its surface. The XRD pattern showed the amorphous structure of carbon having the 002 and 100 planes, whereas the Raman spectra clearly displayed G and D bands that further confirmed the amorphous nature of carbon. The SEM images displayed the high porosity, and the BET analysis revealed a high surface area of 1376 m2 g−1, a pore volume of 1.2 cm3 g−1, and a pore size of 4.06 nm with the coexistence of micropores and mesopores. The adsorption of dyes was performed by varying the dye concentration, pH, time, and the sample dose. The maximum percent of RhB dye removal by AC (Db-s) was 98.4% at an aqueous solution of 20 ppm, pH 8.5, an adsorbent dose of 0.03 g, and a time of 5 min. This study proved to be successful in addressing the local problem of wastewater pollution of garment and textile industrial effluents using locally available agro-waste of Dalbergia sisoo.

Morphology and Mechanical Properties of the Polyurethane/PANI-DBSA Blend Nanofibers by the Electrospinning Technique

2013 ◽  
Vol 651 ◽  
pp. 87-90 ◽  
Author(s):  
Xiu Lian Wang ◽  
Liu Xue Zhang
Keyword(s):  
Sulfonic Acid ◽  
Composite Nanofibers ◽  
Weight Ratio ◽  
Electrospun Nanofibers ◽  
Average Diameter ◽  
Electrospinning Process ◽  
Sem Images ◽  
Electrospinning Technique ◽  
Dodecylbenzene Sulfonic Acid ◽  
Morphology And Mechanical Properties

In this study, composite nanofibers of polyaniline doped with dodecylbenzene sulfonic acid (PANI-DBSA) and polyurethane (PU) were prepared via an electrospinning process. The morphology, diameter, and structure of the electrospun nanofibers were investigated. SEM images showed that the morphology and diameter of the nanofibers were mainly affected by the weight ratio of the blend. The average diameter of the nanofibers was 370–1620 nm. The diameter gradually decreased with increasing PANI-DBSA content in the blend, and more beads were obtained in the composite.

Electrospun Cellulose Acetate Fiber Containing Rubber Extract

2015 ◽  
Vol 1119 ◽  
pp. 329-333 ◽  
Author(s):  
Natthakitta Suwannateep ◽  
Chidchanok Meechaisue ◽  
Hubert Ruch
Keyword(s):  
Cellulose Acetate ◽  
High Surface ◽  
Potential Candidate ◽  
High Porosity ◽  
Fiber Mats ◽  
New Approach ◽  
Surface Areas ◽  
Innovative Products ◽  
Cellulose Acetate Fiber ◽  
First Time

Recent studies on cream of rubber extract (HB) have significantly showed skin improvement results, however, there were color and odor issues. To solve the problems, we successfully produced ultra-fine cellulose acetate (CA) fiber mats (electrospun fibers) containing 1-5 wt% extracts of rubber from Hevea brasilensis without any chemical additions. This new approach has in fact revealed the desired material and biomolecule immobilization. The SEM photographs show the straight and even shaping of the processed HB-CA fibers. The average fiber diameters of the HB-CA fibers ranged between 415 and 585 nm. Moreover, HB-CA solutions containing 1-3% HB extract resulted in a more consistent texture of the fiber mats. This was the first time to produce nanofibers using only rubber extract and cellulose acetate without any other potentially bioactive components involved. This innovation did not only solve the initially addressed color and odor issues, but also provided a new purified material of very small fibers which allows better control of its bioactivity due to the fact that less chemical substances are involved. Its highly interesting characteristics, such as high surface areas to mass ratio, high porosity et al make this result an excellent potential candidate e.g. facial masks, and other innovative products in the field of cosmetics and pharmaceutical industry. Further research is needed and highly promising.

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