Repeated self-healing of nano and micro scale cracks in epoxy based composites by tri-axial electrospun fibers including different healing agents

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 73133-73145 ◽  
Author(s):  
Jamal Seyyed Monfared Zanjani ◽  
Burcu Saner Okan ◽  
Ilse Letofsky-Papst ◽  
Yusuf Menceloglu ◽  
Mehmet Yildiz
Keyword(s):  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Self Healing ◽  
Micro Scale ◽  
One Step

Multi-walled healing fibers with a novel architecture are fabricated through a direct, one-step tri-axial electrospinning process to encapsulate different healing agents inside the fibers with two distinct protective walls.

Nacre-mimetic epoxy matrix composites reinforced by two-dimensional glass reinforcements

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 33184-33196 ◽  
Author(s):  
S. N. Gurbuz Guner ◽  
A. F. Dericioglu
Keyword(s):  
Epoxy Matrix ◽  
Slip Casting ◽  
Matrix Composites ◽  
Two Dimensional ◽  
Hot Press ◽  
Power Efficient ◽  
Micro Scale ◽  
Efficient Process ◽  
One Step

Inspired by the micro-scale architecture of nacre, epoxy matrix bulk composites reinforced by aligned 2D glass reinforcements were fabricated using a novel, one-step and time/man-power efficient process called hot-press assisted slip casting (HASC).

scholarly journals Improvement of the Firocoxib Dissolution Performance Using Electrospun Fibers Obtained from Different Polymer/Surfactant Associations

2019 ◽  
Vol 20 (12) ◽  
pp. 3084 ◽  
Author(s):  
Lauretta Maggi ◽  
Valeria Friuli ◽  
Enrica Chiesa ◽  
Silvia Pisani ◽  
Mirena Sakaj ◽  
...  
Keyword(s):  
Amorphous State ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Water Interaction ◽  
Remarkable Improvement ◽  
Polymer Surfactant ◽  
Carrier Systems ◽  
Scanning Electron

An electrospinning process was optimized to produce fibers of micrometric size with different combinations of polymeric and surfactant materials to promote the dissolution rate of an insoluble drug: firocoxib. Scanning Electron Microscopy (SEM) showed that only some combinations of the proposed carrier systems allowed the production of suitable fibers and further fine optimization of the technique is also needed to load the drug. Differential scanning calorimetry (DSC) and X-ray powder diffraction (XRPD) suggest that the drug is in an amorphous state in the final product. Drug amorphization, the fine dispersion of the active in the carriers, and the large surface area exposed to water interaction obtained through the electrospinning process can explain the remarkable improvement in the dissolution performance of firocoxib from the final product developed.

scholarly journals TiO2 NPs Assembled into a Carbon Nanofiber Composite Electrode by a One-Step Electrospinning Process for Supercapacitor Applications

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 899 ◽  
Author(s):  
Bishweshwar Pant ◽  
Mira Park ◽  
Soo-Jin Park
Keyword(s):  
Electrode Material ◽  
Carbon Nanofiber ◽  
Titanium Dioxide Nanoparticles ◽  
Scale Up ◽  
Carbon Composite ◽  
Electrospinning Process ◽  
Tio2 Nps ◽  
Electrospinning Method ◽  
One Step ◽  
Supercapacitor Applications

In this study, we have synthesized titanium dioxide nanoparticles (TiO2 NPs) into carbon nanofiber (NFs) composites by a simple electrospinning method followed by subsequent thermal treatment. The resulting composite was characterized by state-of-the-art techniques and exploited as the electrode material for supercapacitor applications. The electrochemical behavior of the as-synthesized TiO2 NPs assembled into carbon nanofibers (TiO2-carbon NFs) was investigated and compared with pristine TiO2 NFs. The cyclic voltammetry and charge–discharge analysis of the composite revealed an enhancement in the performance of the composite compared to the bare TiO2 NFs. The as-obtained TiO2-carbon NF composite exhibited a specific capacitance of 106.57 F/g at a current density of 1 A/g and capacitance retention of about 84% after 2000 cycles. The results obtained from this study demonstrate that the prepared nanocomposite could be used as electrode material in a supercapacitor. Furthermore, this work provides an easy scale-up strategy to prepare highly efficient TiO2-carbon composite nanofibers.

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.

One-step fabrication of short electrospun fibers using an electric spark

2013 ◽  
Vol 213 (11) ◽  
pp. 1894-1899 ◽  
Author(s):  
Indra Wahyudhin Fathona ◽  
Akihiro Yabuki
Keyword(s):  
Electrospun Fibers ◽  
One Step

Study of Preparation Metallocene Based LLDPE Extra-Fibers by Melt Electrospinning Process

2012 ◽  
Vol 512-515 ◽  
pp. 2424-2427
Author(s):  
Na Zhao ◽  
Tai Qi Liu ◽  
Rui Xue Liu
Keyword(s):  
Field Strength ◽  
High Viscosity ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Optimal Parameters ◽  
Common Solution ◽  
Melt Electrospinning ◽  
Fine Fiber ◽  
Electrospinning Method ◽  
Solution Electrospinning

In this paper, metallocene based LLDPE (mLLDPE) extra-fine fiber , which can not be processed by a common solution electrospinning method.was successfully prepared via a melt electrospinning method. First, a self-designed melt electrospinning device was manufctured and it was used to produce mLLDPE fibers . Then LLDPE extra-fine fiber was successfully prepared by addition of viscosity-reducing additive such as wax, and the resulted fiber was charctered by SEM. Last, the optimal parameters for the preparation of mLLDPE fiber was determined. The experimental results show that commercial mLLDPE can hardly be processed to fibers because of its high viscosity. The diameter and morphology of resulted mLLDPE electrospun fibers depend on the electrospinning parameters such as electric field strength and collecting distance.

A novel method for preparing electrospun fibers with nano-/micro-scale porous structures

2009 ◽  
Vol 63 (2) ◽  
pp. 259-265 ◽  
Author(s):  
Yazhou Wang ◽  
Bochu Wang ◽  
Guixue Wang ◽  
Tieying Yin ◽  
Qingsong Yu
Keyword(s):  
Electrospun Fibers ◽  
Porous Structures ◽  
Micro Scale ◽  
Novel Method

Properties of Electrospinning Jets

2009 ◽  
Vol 1240 ◽  
Author(s):  
Darrell H Reneker ◽  
Yu Xin ◽  
Hyungjin Lee ◽  
Yinan Lin ◽  
Kaiyi Liu ◽  
...  
Keyword(s):  
Elongational Flow ◽  
Electrospinning Process ◽  
Electrospun Fibers ◽  
Electron Microscopic ◽  
Fluid Jets

AbstractMeasurement of elongational stresses, stereographic images of jet paths, innovative collection of fluid jets, and utilization of elongational flow for assembly or disassembly of particulate structures, the electron microscopic views inside nanofibers, and the morphological and crystallographic changes that occur during heating of the metastable electrospun fibers illuminate the growing versatility of the electrospinning process.

scholarly journals Influence of Hybrid Sol-Gel Crosslinker on Self-Healing Properties for Multifunctional Coatings

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5382
Author(s):  
Guillaume Lollivier ◽  
Marie Gressier ◽  
Florence Ansart ◽  
Maëlenn Aufray ◽  
Marie-Joëlle Menu
Keyword(s):  
Sol Gel ◽  
Interface Layer ◽  
Hybrid Coatings ◽  
Organic Polymer ◽  
Self Healing ◽  
Oxide Interface ◽  
Protective Oxide ◽  
New Class ◽  
One Step

Self-healing polymers are a new class of material that has recently received a lot of attention because of the lifespan improvement it could bring to multiple applications. One of the major challenges is to obtain multifunctional materials which can self-heal and exhibit other interesting properties such as protection against corrosion. In this paper, the effect of the incorporation of an aminosilane on the properties of a self-healing organic polymer containing disulfide bond is studied on films and coatings for aluminium AA2024-T3 using simple one step in situ synthesis. Hybrid coatings with enhanced anticorrosion properties measured by EIS were obtained thanks to the formation of a protective oxide interface layer, while exhibiting wound closure after exposition at 75 °C. The thermal, mechanical and rheological properties of the films with different aminosilane amounts were characterized in order to understand the influence of the slight presence of the inorganic network. Stiffer and reprocessable hybrid films were obtained, capable to recover their mechanical properties after healing. The nanocomposite structure, confirmed by TEM, had a positive effect on the self-healing and stress relaxation properties. These results highlight the potential of sol-gel chemistry to obtain efficient anticorrosion and self-healing coatings.

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