KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 10 of 19

Some of the metrics are blocked by your
consent settings
Antibacterial characterization of ciprofloxacin-doped electrospun of low molecular weight polyethylene oxide (PEO) and sodium alginate (NaAlg) nanofibers
(2026-02-23)
Niyomchon, Phuphinee
;
Treebupachatsakul, Treesukon
;
Srirussamee, Kasama
Producing nanofibers using the electrospinning technique is a developed method that is widely used and of significant interest nowadays. This technique can be applied using various types of polymers. This research aimed to investigate the antibacterial PEO-NaAlg nanofiber fabrication. The fiber fabrication was examined under various viscosities of electrospinning solution. The electrospun nanofiber fabrication focuses on blending polyethylene oxide (PEO) with a molecular weight of 200-300 kDa, mixed with sodium alginate (NaAlg) of three different viscosities: 150 cP, 300 cP, and 730 cP to study how the viscosity of the solution affects the morphology of electrospun nanofibers. The PEO-NaAlg electrospun nanofiber was enhanced for water insolubility by crosslinking with calcium chloride (CaCl₂). The additional antibacterial property of the nanofiber by loading an antibacterial agent potentially against the growth of bacteria, was investigated. Antibacterial drug, ciprofloxacin at varying amounts of 0.05%w/v, 0.20%w/v, and up to 0.25%w/v was loaded to PEO-NaAlg solution and conducted electrospinning. The effectiveness of the antibacterial electrospun nanofiber was evaluated by testing its ability to inhibit the growth of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The inhibition area before and after crosslinking was observed. The results showed that the acquired nanofibber formation required 7%w/v of 200 kDa to 300 kDa of PEO, and blending 1%w/v NaAlg of 150 cP can certainly retain fiber morphology after crosslinking. Moreover, nanofibers loaded with ciprofloxacin effectively inhibit the growth of E. coli.
Some of the metrics are blocked by your
consent settings
Multi-phase structure electrospun CNF@Ag/Mn/Bi/Fe composite nanofiber enhanced supercapacitor behavior
(2025-02-15)
Sinprachim, Tanayt
;
Klompong, Narit
;
Chanlek, Narong
;
Kidkhunthod, Pinit
;
Maensiri, Santi
This study presents the development of carbon-based multiphase metal oxide nanocomposites (CNF@MO<inf>x</inf>; M = Ag, Mn, Bi, and Fe) incorporating silver, manganese, bismuth, and iron nanoparticles within polyacrylonitrile (PAN)-derived carbon nanofibers. These nanocomposites were fabricated via the electrospinning technique with metal oxide concentrations of 10, 20, and 40 %w. This was followed by annealing in an argon atmosphere. The resulting nanofibers exhibited diameters ranging from 559 to 830 nm, with embedded nanoparticles measuring from 9 to 21 nm. Comprehensive characterization revealed that the nanofibers possessed uniform morphology, high porosity, and robust thermal stability. X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) confirmed the valence states of the metal oxides (Ag⁰, Bi³⁺, Mn²⁺, Mn³⁺, Fe²⁺, and Fe³⁺), which are integral to redox reactions and charge storage mechanisms. Among the fabricated composites, CNF@Ag/Mn/Bi/Fe-20 demonstrated the best electrochemical performance, achieving a specific capacitance of 156 F g−1 at a scan rate of 2 mV s−1 and outstanding cycling stability with a capacity retention of over 96 % after 1400 charge-discharge cycles. The synergistic combination of double-layer capacitance and pseudocapacitance mechanisms in these nanofibers represents a significant improvement over conventional electrode material. This study highlights CNF@Ag/Mn/Bi/Fe nanocomposites as highly promising candidates for advanced energy storage applications, particularly in supercapacitor technologies.
Some of the metrics are blocked by your
consent settings
Optimization of Gelatin Fibrous Scaffold Properties by PCL and CMC by Using Electrospinning Technique
(2025-01-01)
Meesa, Banpot
;
Klongboonjit, Sakon
This study aimed to utilize the electrospinning process to produce cell culture scaffolds from blends of gelatin-polycaprolactone and carboxymethyl cellulose. The experimental design involved determining the optimal voltage and feed rate for various ratios of the gelatin-polycaprolactone-carboxymethyl cellulose blends, including 100/0/0, 90/5/5, 80/15/5, 70/25/5, and 60/35/5. Gelatin served as the primary raw material at a 10% ratio, while polycaprolactone was added at 10%, and carboxymethyl cellulose acted as a strengthening agent at 0.8%. The solvent used for gelatin and polycaprolactone was 2,2,2 -trifluoroethanol, while water was used for carboxymethyl cellulose. The raw materials were thoroughly mixed to ensure homogeneity, and the resulting blend was processed by an electrospinning machine under various conditions to form nanofiber scaffolds. The workpieces were then dried and left to relax for 48 hours before being baked at 140°C for 72 hours, resulting in high-quality fiber material. The experiment revealed that the fiber sizes ranged from 1.5 μm to 5.2 μm, with the swelling ratio of the GPC60:35:5 mixture at 11.65%, confirming the feasibility of using electrospinning to create effective scaffolds for cell culture applications.
Some of the metrics are blocked by your
consent settings
Electrospinning of Nanofibers Effect of Gelatin by Polycaprolactone and Carboxymethyl Cellulose Degradation Characteristics
(2025-01-01)
Meesa, Banpot
;
Klongboonjit, Sakon
This study aims to investigate the degradation of gelatin-based polycaprolactone and carboxymethyl cellulose scaffolds produced through the electrospinning technique for nanofiber scaffolds. The experimental design varies the voltage and feed rate for different ratios of gelatin, polycaprolactone, cellulose, and carboxymethyl cellulose, which are 100/0/0, 90/5/5, 80/15/5, 70/25/5, and 60/35/5, respectively. An organic solvent, 2,2,2-trifluoroethanol, which is a suitable solvent for gelatin, polycaprolactone, and carboxymethyl cellulose, is used, though the materials are dissolved in water to prepare the raw material for electrospinning. To characterize the scaffolds, their physical properties are analyzed, including fiber morphology and size, using scanning electron microscopy. The results reveal that as the polycaprolactone content increases from 0%, 5%, 15%, 25%, to 35%, with carboxymethyl cellulose maintained at 0% or 5%, the fiber size decreases from 1.5 μm to 5.2 μm. This suggests that electrospinning is effective for fabricating scaffolds from all three materials. Furthermore, the decomposition rates are optimized for GPC90/5/5, GPC80/15/5, and GPC70/25/5, which completely decompose within 36 hours. Additionally, GPC80/15/5 shows a good degradation rate, while GPC100/0/0 and GPC60/35/5 exhibit rapid degradation.
Some of the metrics are blocked by your
consent settings
Customized electrospun multilayer composite polymer electrolytes: PEO-PAN-NbO2 nanofiber membrane for enhancing the performance of lithium-ion batteries
(2024-06-01)
Yonchai, Chutarat
;
Kidkhunthod, Pinit
;
Siriroj, Sumeth
;
Padchasri, Jintara
;
Sonsupap, Somchai
Ground-breaking research into the development of a multilayer composite polymer electrolyte aims to enhance the safety associated with liquid electrolytes utilized in lithium batteries. The electrolyte consists of two outer layers made of electrospun poly(vinylidene fluoride) (PVDF) and a middle layer comprised of a fibrous membrane containing PEO, PAN-PEO, PEO-NbO<inf>2</inf>, and PAN-PEO-NbO<inf>2</inf>. The investigated PEO-PAN-NbO<inf>2</inf> system demonstrates a higher room temperature ionic conductivity of 2.451 × 10−1 mS cm−1 than that of single-phase electrolyte systems. Incorporating inorganic fillers such as NbO<inf>2</inf> into PEO polymer electrolytes, in conjunction with PAN copolymerization, significantly enhances ionic conductivity and amplifies surface area. Consequently, the utilization of these techniques that demonstrate increased polymer membranes leads to improved efficiency and security of solid-state electrochemical devices. The multilayer composite polymer electrolyte is created by continuous electrospinning, which allows for precise control and improves safety features.
Some of the metrics are blocked by your
consent settings
Development of electrospun nanofibers containing methyl jasmonate for applying in postharvest fruit and vegetables
(2022-04-01)
Kebngon, C.
;
Srilaong, V.
;
Penchaiya, P.
;
Supapvanich, S.
;
Tepsorn, R.
Development of a nanofiber sheet containing methyl jasmonate produced by electrospinning technique for delaying senescence in perishable crops was studied. Nanofibers contain highly porous mesh with their large surface-to-volume ratio which has much advantage for improving performance for many applications. This research aims to develop the nanofiber sheet containing methy jasmonate. The first study was to produce the proper nanofiber sheet by varying the combination of three polymers as chitosan, cellulose and gelatin for nanofiber sheet. Nanofiber sheets of various proportions of chitosan, cellulose and gelatin as 40:10:50, 40:20:40, 40:30:30 (chitosan: cellulose:gelatin) were produced by using an electrospinning machine. The distance of polymer shooting, flow rate of polymer injection and potential difference of electricity supply was varied to find the suitable condition for producing the carried nanofiber sheet. The result revealed that the 40:30:30 (chitosan:cellulose:gelatin) with 10 cm of polymer shooting distance, 11.67 μL min-1of polymer flow rate and 23 kV of potential difference was the best condition for producing the nanofiber sheet. Afterward, this condition was chosen to the further experiment. Various concentrations of methyl jasmonate were added into the polymer solution prior to shooting the nanofiber by electrospinning machine. The results suggested that 5 mM methyl jasmonate electrospun nanofibers revealed the proper morphology with the smallest size of fiber diameter without any droplet of bead, easy to crack. This treatment could potentially be used for delaying senescence of postharvest fruit and vegetable.
Some of the metrics are blocked by your
consent settings
Antimicrobial activity of edible electrospun chitosan/cellulose acetate/gelatin hybrid nanofiber mats incorporating eugenol
(2019-06-04)
Somsap, Jaruayporn
;
Kanjanapongkul, Kobsak
;
Chancharoonpong, Chuenjit
;
Supapvanich, Suriyan
;
Tepsorn, Racha
Antimicrobial nanofiber mats were successfully fabricated via electrospinning. Polymer solutions of chitosan, cellulose acetate and gelatin were blended at a volume ratio of 4: 1: 5. Eugenol at concentrations of 0 to 10. 0% (v/ v) was directly incorporated into the mixed polymer solutions. Electrospinning was performed at 23 kV with a flow rate at 0. 7 ml/ h and collector distance of 10 cm. The average diameters of fibers incorporated with eugenol ranged from 152. 32± 41. 48 to 288. 92±77. 69 nm. Fibers with larger diameters and junctions appeared when the concentration of eugenol was increased. Eugenol release was observed within 300 min. The burst release of eugenol at 0.1, 0.75, and 1.5% (v/v) reached equilibrium after 60 min while the burst release at 3.0, 5.0 and 10. 0% (v/ v) continued to increase gradually. The phase transition temperatures of nanofiber mats incorporated with eugenol ranged from 129.69 to 161.84 °C. The thermal characteristic demonstrated that the melting point decreased in accordance with the increase of incorporated eugenol. The nanofiber mats with eugenol at less than 5. 0% (v/ v) showed better thermostability than mats incorporated with eugenol concentrations greater than 5.0% (v/v). Antibacterial activity was tested against Salmonella typhimurium and Staphylococcus aureus. The results demonstrated that the edible electrospun CS/ CA/ Gel nanofiber mats incorporated with eugenol could effectively retard the growth of both bacteria. Our results suggest that eugenol incorporated nanofibers have potential applications as antimicrobial materials in active food packaging, air filtration, antibacterial textiles, wound dressing, drug delivery and others.
Some of the metrics are blocked by your
consent settings
Influence of dispersed phase morphology on electrical and fatigue properties of BaTiO3/PDMS nanogenerator
(2018-11-01)
Sriphan, Saichon
;
Nawanil, Chanisa
;
Vittayakorn, Naratip
A flexible piezoelectric nanogenerator (FPENG) was fabricated by incorporating barium titanate (BT) fibers and BT powders into polydimethylsiloxane (PDMS) matrix phase, also with an interdigital electrodes (IDEs). The electrospinning method was used to prepare BT fibers. Phase structure was carried out by the x-ray diffraction (XRD) technique. By using the Rietveld refinement method, a tetragonal structure of BT fiber could be confirmed. The scanning electron microscopy results showed a non-smooth surface of BT fibers, indicating the polymeric and organic precursors have been removed. The fabricated FPENG with 50% ratio of BT fibers was capable to generate an open-circuit voltage of ≈ 12 V and a short-circuit current of ≈ 1 μA. The effect of dispersed phases inside FPENG becomes the role to improve the output performance. This FPENG device can operate up to 5k times before degeneration. By continuously pressing up to 40k times, the output voltage tended to decrease reaching to a null value. The mechanical fatigue effect has been found that it related to the damage produced at the interface between IDEs and PDMS during pressing. The present results can be guided to further design the material and the device structure to obtain high-performance and stability of the FPENG devices.
Some of the metrics are blocked by your
consent settings
Sb/F-codoped SnO2 nanofibers synthesized by electrospinning
(2016-12-01)
Santibenchakul, Somtop
;
Chaiyasith, Suwan
;
Pecharapa, Wisanu
In this present work, metal and non-metal doping in tin oxide nanofibers was fabricated by electrospinning technique. Sb/F co-doped SnO<inf>2</inf> nanofibers was synthesized by using polyvinylpyrrolidone as polymer precursor and SnCl<inf>4</inf>·5H<inf>2</inf>O, SbCl<inf>3</inf>, NH<inf>4</inf>F as tin, antimony and fluorine source, respectively. The concentration of polyvinylpyrrolidone and stannic chloride dissolved with mixture solvent of Dimethylformamide and absolute Ethanol were fixed at 8 and 10%w/w and used as staring precursors. Electrospinning process was carried out at 10 kV of applied voltage by maintaining tip to collector distance of 10 cm and the feeding speed of mixed precursor was controlled at 0.5 ml/h. The as-spun nanofibers mats were calcined in air at 600°C for 3 hours to obtain the doped-SnO<inf>2</inf> nanofibers. Thermogravimetric and X-ray diffraction results support that the optimized calcined temperature to remove polyvinylpyrrolidone template and oxidize Sn precursor is 600°C. The morphologies of Sb/F co-doped SnO<inf>2</inf> nanofibers appear in rough surface with rearrangement of Sb/F doped SnO<inf>2</inf> porous nanobeads. The average diameter of Sb/F doped SnO<inf>2</inf> nanofibers is 422 nm with the crystallite size about 22 nm. Fourier-transform infrared and energy-dispersive X-ray spectroscopy results indicate states of transformation of starting precusors to the formation of Sb/F doped SnO<inf>2</inf> nanofibers.
Some of the metrics are blocked by your
consent settings
PVP-assisted Sb-doped SnO2 nanofibers synthesized by electrospinning process
(2016-01-01)
Santibenchakul, Somtop
;
Chaiyasith, Suwan
;
Pecharapa, Wisanu
Well-defined Sb-doped tin oxide (ATO) nanofibers were synthesized by electrospinning technique. Polyvinylpyrrolidone (PVP), SnCl<inf>4</inf>·;5H<inf>2</inf>O and SbCl<inf>3</inf> were chosen as suitable precursors for preparing ATO nanofibers. All of precursors were homogeneously dissolved with the mixture solvent of dimethylformamide (DMF) and absolute ethanol. Electrospinning process was carried out at applied voltage of 10 kV and distance between needle tip to aluminium foil collector was fixed at 10 cm. The injection rate of precursor solution was controlled at 0.5 ml/hr. The as-spun nanofibers were calcined at 600°C with heating rate of 5 °C/min in order to remove the PVP template and improve the crystallinity of ATO structure. Effect of Sb doping concentration on their crystal structure was investigated. The morphology and crystal structure of the electrospun fibers were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). In this work, the obtained ATO nanofibers had average range diameter from 150 to 350 nm with rough surface. Sb doping concentration in ATO nanofibers plays a key role on their network morphology. The excellent doping concentration of Sb that offered the continuous fibrous and porous ATO nanofibers was 7%.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results