scholarly journals Functionalized Electrospun Fibers for the Design of Novel Hydrophobic and Anticorrosive Surfaces

Coatings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 300 ◽  
Author(s):  
Pedro Rivero ◽  
David Yurrita ◽  
Carlos Berlanga ◽  
José Palacio ◽  
Rafael Rodríguez
Keyword(s):  
Corrosion Resistance ◽  
Metal Oxide Nanoparticles ◽  
Chemical Vapor ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Electrospinning Technique ◽  
Water Contact ◽  
Force Microscopy ◽  
Hydrophobic Molecule ◽  
High Degree

In this work, a novel coating was deposited on aluminum alloy samples by using a combination of electrospinning and chemical vapor deposition (CVD-silanization) techniques in order to create a functionalized film with an enhancement of both corrosion resistance and hydrophobicity. The electrospinning technique makes the fabrication of highly crosslinked electrospun fibers possible by the combination of both poly(acrylic acid) and β-cyclodextrin, respectively, which can be easily functionalized in a further step by using the CVD-silanization process due to the evaporation of a hydrophobic molecule such as 1H,1H,2H,2H-Perflurodecyltriethoxysilane. In addition, the resultant electrospun fibers with a high degree of insolubility have been successfully fabricated and metal oxide nanoparticles (TiO2NPs) have been incorporated into the electrospun polymeric solution in order to improve the corrosion protection. The surface morphology has been determined by using light optical microscopy, atomic force microscopy, scanning electron microscopy, and water contact angle (WCA) measurements. The corrosion resistance has been evaluated by using both potentiodynamic polarization and pitting corrosion tests. Finally, the results related to WCA measurements after CVD-silanization corroborate that the surfaces have been successfully functionalized with a hydrophobic behavior in comparison with the electrospinning process, showing a considerable difference in the roughness.

scholarly journals Modeling Experimental Parameters for the Fabrication of Multifunctional Surfaces Composed of Electrospun PCL/ZnO-NPs Nanofibers

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4312
Author(s):  
Pedro J. Rivero ◽  
Juan P. Fuertes ◽  
Adrián Vicente ◽  
Álvaro Mata ◽  
José F. Palacio ◽  
...  
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Surface Morphology ◽  
Water Contact Angle ◽  
Solution Concentration ◽  
Electrospun Fibers ◽  
Operational Parameters ◽  
Zno Nps ◽  
Electrospinning Technique ◽  
Water Contact

In this work, a one-step electrospinning technique has been implemented for the design and development of functional surfaces with a desired morphology in terms of wettability and corrosion resistance by using polycaprolactone (PCL) and zinc oxide nanoparticles (ZnO NPs). The surface morphology has been characterized by confocal microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM) and water contact angle (WCA), whereas the corrosion resistance has been evaluated by Tafel polarization curves. Strict control over the input operational parameters (applied voltage, feeding rate, distance tip to collector), PCL solution concentration and amount of ZnO NPs have been analyzed in depth by showing their key role in the final surface properties. With this goal in mind, a design of experiment (DoE) has been performed in order to evaluate the optimal coating morphology in terms of fiber diameter, surface roughness (Ra), water contact angle (WCA) and corrosion rate. It has been demonstrated that the solution concentration has a significant effect on the resultant electrospun structure obtained on the collector with the formation of beaded fibers with a higher WCA value in comparison with uniform bead-free fibers (dry polymer deposition or fiber-merging aspect). In addition, the presence of ZnO NPs distributed within the electrospun fibers also plays a key role in corrosion resistance, although it also leads to a decrease in the WCA. Finally, this is the first time that an exhaustive analysis by using DoE has been evaluated for PCL/ZnO electrospun fibers with the aim to optimize the surface morphology with the better performance in terms of corrosion resistance and wettability.

scholarly journals Designing Multifunctional Protective PVC Electrospun Fibers with Tunable Properties

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2086
Author(s):  
Pedro J. Rivero ◽  
Iker Rosagaray ◽  
Juan P. Fuertes ◽  
José F. Palacio ◽  
Rafael J. Rodríguez
Keyword(s):  
Fiber Diameter ◽  
Electrospinning Process ◽  
Operating Parameters ◽  
Electrospun Fibers ◽  
Polymeric Precursor ◽  
Operational Parameters ◽  
Electrospinning Technique ◽  
Coating Morphology ◽  
Hydrophobic Nature ◽  
First Time

In this work, the electrospinning technique is used for the fabrication of electrospun functional fibers with desired properties in order to show a superhydrophobic behavior. With the aim to obtain a coating with the best properties, a design of experiments (DoE) has been performed by controlling several inputs operating parameters, such as applied voltage, flow rate, and precursor polymeric concentration. In this work, the reference substrate to be coated is the aluminum alloy (60661T6), whereas the polymeric precursor is the polyvinyl chloride (PVC) which presents an intrinsic hydrophobic nature. Finally, in order to evaluate the coating morphology for the better performance, the following parameters—such as fiber diameter, surface roughness (Ra, Rq), optical properties, corrosion behavior, and wettability—have been deeply analyzed. To sum up, this is the first time that DoE has been used for the optimization of superhydrophobic or anticorrosive surfaces by using PVC precursor for the prediction of an adequate surface morphology as a function of the input operational parameters derived from electrospinning process with the aim to validate better performance.

scholarly journals The Role of the Fiber/Bead Hierarchical Microstructure on the Properties of PVDF Coatings Deposited by Electrospinning

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 464
Author(s):  
Adrián Vicente ◽  
Pedro J. Rivero ◽  
José F. Palacio ◽  
Rafael Rodríguez
Keyword(s):  
Corrosion Resistance ◽  
Vinylidene Fluoride ◽  
Fiber Composite ◽  
Electrospun Fiber ◽  
Operational Parameters ◽  
Experimental Conditions ◽  
Electrospinning Technique ◽  
Water Contact ◽  
Good Thermal Stability ◽  
Vis Spectroscopy

Among the various polymeric options employed for the deposition of electrospun coatings, poly(vinylidene fluoride) (PVDF) has been widely investigated thanks to its excellent mechanical properties, high chemical resistance, and good thermal stability. In this work, the electrospinning technique is used for the fabrication of functional PVDF fibers in order to identify and evaluate the influence of the experimental conditions on the nanofiber properties in terms of optical transmittance, wettability, corrosion resistance, and surface morphology. Some of these properties can play a relevant role in the prevention of ice formation in aircrafts. According to this, a matrix of 4 × 4 samples of aluminum alloy AA 6061T6 was successfully coated by controlling two operational input parameters such as the resultant applied voltage (from 10 up to 17.5 KV) and the flow rate (from 800 up to 1400 µL/h) for a fixed polymeric precursor concentration (15 wt.%). The experimental results have shown a multilevel fiber-bead structure where the formation of a fiber mesh directly depends on the selected operational parameters. Several microscopy and surface analysis techniques such as confocal microscopy (CM), field emission scanning electron microscopy (FE-SEM), UV/vis spectroscopy, and water contact angle (WCA) were carried out in order to corroborate the morphology, transmittance, and hydrophobicity of the electrospun fiber composite. Finally, the corrosion behavior was also evaluated by electrochemical tests (Tafel curves measurement), showing that the presence of electrospun PVDF fibers produces a relevant improvement in the resultant corrosion resistance of the coated aluminum alloys.

Polycaprolactone Fiber Bundles Prepared by Self-Bundling Electrospinning

2012 ◽  
Vol 622-623 ◽  
pp. 271-275 ◽  
Author(s):  
Patcharaporn Thitiwongsawet ◽  
Tanwa Tiyajalearn ◽  
Aumnart Klinchan ◽  
Chaninporn Thanatthammachote
Keyword(s):  
Electrical Conductivity ◽  
Fiber Diameter ◽  
Average Diameter ◽  
Electrospinning Process ◽  
Fiber Bundles ◽  
Electrospun Fibers ◽  
Average Fiber Diameter ◽  
Electrospinning Technique

Polycaprolactone (PCL) fiber bundles were successfully prepared by self-bundling electrospinning technique from two different concentrations (i.e. 12% and 15% w/v) of PCL solution. Self-bundling of electrospun fibers was induced by used of a grounded needle tip at the beginning of electrospinning process. Electrical conductivity of PCL solutions were increased and average fiber diameter were decreased by addition and increasing amount of pyridinium formate (PF) at concentration of 3, 4, and 5% w/v into either 12% or 15% w/v PCL solutions. The average diameter of electrospun fibers and bundles were in range of 2.1-3.3 m and 100-120 m, respectively.

scholarly journals Real-Time Characterization of Electrospun PVP Nanofibers as Sensitive Layer of a Surface Acoustic Wave Device for Gas Detection

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
D. Matatagui ◽  
M. J. Fernández ◽  
J. P. Santos ◽  
J. Fontecha ◽  
I. Sayago ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Real Time ◽  
Surface Acoustic Wave ◽  
Room Temperature ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Sensitive Layer ◽  
Depth Of Penetration ◽  
Fiber Layer ◽  
Electrospinning Technique

The goal of this work has been to study the polyvinylpyrrolidone (PVP) fibers deposited by means of the electrospinning technique for using as sensitive layer in surface acoustic wave (SAW) sensors to detect volatile organic compounds (VOCs). The electrospinning process of the fibers has been monitored and RF characterized in real time, and it has been shown that the diameters of the fibers depend mainly on two variables: the applied voltage and the distance between the needle and the collector, since all the electrospun fibers have been characterized by a scanning electron microscopy (SEM). Real-time measurement during the fiber coating process has shown that the depth of penetration of mechanical perturbation in the fiber layer has a limit. It has been demonstrated that once this saturation has been reached, the increase of the thickness of the fibers coating does not improve the sensitivity of the sensor. Finally, the parameters used to deposit the electrospun fibers of smaller diameters have been used to deposit fibers on a SAW device to obtain a sensor to measure different concentrations of toluene at room temperature. The present sensor exhibited excellent sensitivity, good linearity and repeatability, and high and fast response to toluene at room temperature.

scholarly journals Preparation of an Asymmetric Membrane from Sugarcane Bagasse Using DMSO as Green Solvent

2019 ◽  
Vol 9 (16) ◽  
pp. 3347 ◽  
Author(s):  
Nu ◽  
Hung ◽  
Hoang ◽  
Van der Bruggen
Keyword(s):  
Cellulose Acetate ◽  
Sugarcane Bagasse ◽  
Raw Material ◽  
Cellulose Derivatives ◽  
Asymmetric Membrane ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Force Microscopy ◽  
Cellulose Acetate Membranes ◽  
High Degree

Asymmetric cellulose acetate membranes have been successfully fabricated by phase inversion, using sugarcane bagasse (SB) as the starting material. SB is a raw material with high potential to produce cellulose derivatives due to its structure and morphology. Cellulose was extracted from SB by pretreatment with solutions of 5 wt% NaOH, 0.5 wt% EDTA; then bleached with 2 wt% H2O2. Cellulose acetate (CA) was prepared by the reaction between extracted cellulose with acetic anhydride, and H2SO4 as a catalyst. The obtained CA exhibited a high degree of substitution (2.81), determined with 1H-NMR spectroscopy and titration. The functional groups and thermal analysis of the extracted cellulose and the synthesized CA have been investigated by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The change in the crystallinity of the extracted cellulose and CA was evaluated by X-ray diffraction (XRD) spectroscopy. Asymmetric membranes were fabricated using dimethyl sulfoxide (DMSO) as the solvent, with a casting thickness of 250 µm. The obtained membranes were studied by scanning electron microscopy (SEM), DSC and atomic force microscopy (AFM). The hydrophilicity of the membranes was evaluated, as demonstrated by the measurement of water contact angle (WCA) and water content. Furthermore, the antifouling properties of membranes were also investigated.

scholarly journals Multifunctional Protective PVC-ZnO Nanocomposite Coatings Deposited on Aluminum Alloys by Electrospinning

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 216 ◽  
Author(s):  
Alvaro Iribarren ◽  
Pedro Rivero ◽  
Carlos Berlanga ◽  
Silvia Larumbe ◽  
Adrian Miguel ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Coating Properties ◽  
Scanning Calorimetry ◽  
Electrospinning Technique ◽  
Water Contact ◽  
Pitting Potential ◽  
Electrochemical Tests ◽  
Force Microscopy ◽  
Atomic Force ◽  
Deposition Parameters

This paper reports the use of the electrospinning technique for the synthesis of nanocomposite micro/nanofibers by combining a polymeric precursor with hydrophobic behavior like polyvinyl chloride (PVC) with nanoparticles of a corrosion inhibitor like ZnO. These electrospun fibers were deposited on substrates of the aluminum alloy 6061T6 until forming a coating around 100 μm. The effect of varying the different electrospinning deposition parameters (mostly applied voltage and flow-rate) was exhaustively analyzed in order to optimize the coating properties. Several microscopy and analysis techniques have been employed, including optical microscopy (OM), field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Water contact angle (WCA) measurements have been carried out in order to corroborate the coating hydrophobicity. Finally, their corrosion behavior has been evaluated by electrochemical tests (Tafel curves and pitting potential measurements), showing a relevant improvement in the resultant corrosion resistance of the coated aluminum alloys.

Drawing of Spatially Oriented Electrospun Fibers

2009 ◽  
Author(s):  
Z. Sun ◽  
J. Knopf ◽  
J. M. Deitzel ◽  
J. W. Gillespie
Keyword(s):  
Dielectric Constant ◽  
Electrospinning Process ◽  
Critical Threshold ◽  
Electrospun Fibers ◽  
Low Dielectric ◽  
Theoretical Predictions ◽  
Target Fibers ◽  
High Degree ◽  
Spatially Oriented ◽  
Multiphase Composite

A simple approach to electrospinning has been developed that enables the collection of polymer, ceramic, and multiphase composite fibers, in quantity, with a high degree of spatial orientation. It has been demonstrated that a careful choice of solvent effectively eliminates the onset of the characteristic “bending” instability that is commonly associated with the electrospinning process. This allows collection of spatially oriented submicron electrospun fibers on a rotating drum without the need for elaborate mechanical or electrostatic manipulation of the electrospinning jet and/or collection target. Fibers have been electrospun from a series of model polyethylene oxide/CHCL3 solutions with a range of conductivities. The experimental data confirms theoretical predictions that the onset of the bending instability is a function of the available “free” charge in the solution, which in turn is strongly influenced by the dielectric constant of the solvent. The results show that fiber orientation becomes random as the conductivity increases, indicating the need for the surface charge density to exceed a critical threshold in order for the bending instability to initiate. Furthermore, it has been demonstrated that fiber diameter can be effectively controlled by controlling drum take-up speed. This method has been experimentally demonstrated with other low dielectric constant solvents and other common polymer, ceramic, composite materials.

scholarly journals A Comparative Study of Multifunctional Coatings Based on Electrospun Fibers with Incorporated ZnO Nanoparticles

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 367 ◽  
Author(s):  
Pedro J. Rivero ◽  
Alvaro Iribarren ◽  
Silvia Larumbe ◽  
José F. Palacio ◽  
Rafael Rodríguez
Keyword(s):  
Corrosion Resistance ◽  
Comparative Study ◽  
Zno Nanoparticles ◽  
Corrosion Current ◽  
Deposition Process ◽  
Electrospun Fibers ◽  
Scanning Calorimetry ◽  
Average Roughness ◽  
Electrospinning Technique ◽  
Step Over

In this work, polymeric fibers of polystyrene (PS) with incorporated ZnO nanoparticles have been deposited onto an aluminum alloy substrate (6061T6) by using the electrospinning technique. In order to optimize the deposition process, the applied voltage and flow rate have been evaluated in order to obtain micrometric electrospun fibers with a high average roughness and superhydrophobic behavior. Thermogravimetric analysis (TGA) has also been employed in order to corroborate the amount of ZnO incorporated into the electrospun fibers, whereas differential scanning calorimetry (DSC) has been performed in order to determine the glass transition temperature (Tg) of the polymeric electrospun fibers. In addition, a specific thermal treatment (Tg + 20 °C) of the synthesized electrospun fibers has been evaluated in the resultant corrosion resistance. A comparative study with previously reported results corresponding to polyvinyl chloride (PVC) fibers is carried out along this paper to show the changes in behavior due to the different compositions and fiber diameters. The coating has produced an important reduction of the corrosion current of the aluminum substrate in two orders of magnitude, showing also an important enhancement against pitting corrosion resistance. Finally, this deposition technique can be used as an innovative way for the design of both superhydrophobic and anticorrosive surfaces in one unique step over metallic substrates with arbitrary geometry.

IN-102

Alloy Digest ◽  
1969 ◽  
Vol 18 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Elevated Temperatures ◽  
Iron Alloy ◽  
High Strength ◽  
Heat Treating ◽  
High Ductility ◽  
International Nickel Company ◽  
Nickel Chromium ◽  
Temperature Performance ◽  
High Degree

Abstract IN-102 is a nickel-chromium-iron alloy designed for long service at temperatures up to 1300 F. It combines high strength and high ductility at the elevated temperatures with a high degree of structural stability. It is used for aerospace, power and steam turbine components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-147. Producer or source: International Nickel Company Inc..

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