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Electrospinning

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https://www.readbyqxmd.com/read/29045125/polyacrylonitrile-separator-for-high-performance-aluminum-batteries-with-improved-interface-stability
#1
Giuseppe Antonio Elia, Jean-Baptiste Ducros, Dane Sotta, Virginie Delhorbe, Agnès Brun, Krystan Marquardt, Robert Hahn
Herein we report, for the first time, an overall evaluation of commercially available battery separators to be used for aluminum batteries, revealing that most of them are not stable in the highly-reactive 1-ethyl-3-methylimidazolium chloride : aluminum trichloride (EMIMCl:AlCl3) electrolyte conventionally employed in rechargeable aluminum batteries. Subsequently, a novel highly-stable polyacrylonitrile (PAN) separator obtained by the electrospinning technique for application in high-performance aluminum batteries has been prepared...
October 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29045068/coaxial-carbon-mno2-hollow-nanofibers-as-sulfur-hosts-for-high-performance-lithium-sulfur-batteries
#2
Lubin Ni, Ganjin Zhao, Yanting Wang, Zhen Wu, Wei Wang, Yunyun Liao, Guang Yang, Guowang Diao
Lithium-sulfur (Li-S) batteries have recently attracted a large amount of attention as promising candidates for next-generation high-power energy storage devices because of their high theoretical capacity and energy density. However, the shuttle effect of polysulfides and poor conductivity of sulfur are still vital issues that constrain their specific capacity and cyclic stability. Here, we design coaxial MnO2-graphitic carbon hollow nanofibers as sulfur hosts for high-performance lithium-sulfur batteries. The hollow C/MnO2 coaxial nanofibers are synthesized via electrospinning and carbonization of the carbon nanofibers (CNFs), followed by an in situ redox reaction to grow MnO2 nanosheets on the surface of CNFs...
October 17, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29044916/free-standing-polyurethane-nanofiber-nets-air-filters-for-effective-pm-capture
#3
Fenglei Zuo, Shichao Zhang, Hui Liu, Hao Fong, Xia Yin, Jianyong Yu, Bin Ding
The filtration performance and light transmittance of nanofiber air filters are restricted by their thick fiber diameter, large pore size, and substrate dependence, which can be solved by constructing substrate-free fibrous membranes with true nanoscale diameters and ultrathin thicknesses, however, it has proven to be extremely challenging. Herein, a roust approach is presented to create free-standing polyurethane (PU) nanofiber/nets air filters composed of bonded nanofibers and 2D nanonets for particular matter (PM) capture via combining electrospinning/netting technique and facile peel off process from designed substrates...
October 17, 2017: Small
https://www.readbyqxmd.com/read/29043781/direct-writing-electrospinning-of-scaffolds-with-multi-dimensional-fiber-architecture-for-hierarchical-tissue-engineering
#4
Honglin Chen, Afonso de Botelho Ferreira Braga Malheiro, Clemens van Blitterswijk, Carlos Mota, Paul Andrew Wieringa, Lorenzo Moroni
Nanofibrous structures have long been used as scaffolds for tissue engineering (TE) applications, due to their favourable characteristics such as high porosity, flexibility, high cell attachment and enhanced proliferation, and overall resemblance to native extracellular matrix (ECM). Such scaffolds can be easily produced at a low cost via electrospinning (ESP), but generally cannot be fabricated with a regular and/or complex geometry, characterized by macropores and uniform thickness. We present here a novel technique for direct writing (DW) with solution ESP to produce complex three-dimensional (3D) multi-scale and ultrathin (~1 µm) fibrous scaffolds with desirable patterns and geometries...
October 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29042622/surface-decoration-of-pt-nanoparticles-via-ald-with-tio2-protective-layer-on-polymeric-nanofibers-as-flexible-and-reusable-heterogeneous-nanocatalysts
#5
Asli Celebioglu, Kugalur Shanmugam Ranjith, Hamit Eren, Necmi Biyikli, Tamer Uyar
Coupling the functional nanoheterostructures over the flexible polymeric nanofibrous membranes through electrospinning followed by the atomic layer deposition (ALD), here we presented a high surface area platform as flexible and reusable heterogeneous nanocatalysts. Here, we show the ALD of titanium dioxide (TiO2) protective nanolayer onto the electrospun polyacrylonitrile (PAN) nanofibrous web and then platinum nanoparticles (Pt-NP) decoration was performed by ALD onto TiO2 coated PAN nanofibers. The free-standing and flexible Pt-NP/TiO2-PAN nanofibrous web showed the enhancive reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) within 45 seconds though the hydrogenation process with the degradation rate of 0...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29041738/highly-reflective-nanofiber-films-based-on-electrospinning-and-their-application-on-color-uniformity-and-luminous-efficacy-improvement-of-white-light-emitting-diodes
#6
Yong Tang, Guanwei Liang, Junchi Chen, Shudong Yu, Zongtao Li, Longshi Rao, Binhai Yu
Based on electrospinning technology, in this study, we fabricated poly(lactic-co-glycolic acid) (PLGA) nanofiber films with high reflectivity and scattering properties. Various films with different thicknesses and fiber diameters were fabricated by changing the electrospinning time and solution concentration, respectively. Detailed optical measurements demonstrate that the film reflectance and scattering ability increase with the thickness, whereas fiber diameter contributes little to both properties. With optimized film thickness and fiber diameter, nanofiber films feature whiteness with a reflectance of 98...
August 21, 2017: Optics Express
https://www.readbyqxmd.com/read/29039918/bio-inspired-antioxidant-defense-system-constructed-by-antioxidants-eluting-electrospun-f127-based-fibers
#7
Haozheng Wang, Xiaodong Xu, Runhai Chen, Jiruo Zhao, Lele Cui, Guangkuo Sheng, Qiang Shi, Shing-Chung Wong, Jinghua Yin
Cells were continuously exposed to oxidative damage by overproduction of reactive oxygen species (ROS) when they contacted implanted biomaterials. The strategy to prevent cells from oxidative injures remains challenge. Inspired by the antioxidant defense system of cells, we constructed a biocompatible and ROS-responsive architecture on the substrate of styrene-b-(ethylene-co-butylene)-b-styrene elastomer (SEBS). The strategy was based on fabrication of 3D architectures through reactive electrospinning of mixture including SEBS, acylated Pluronic F127, copolymer of poly(ethylene glycol) diacrylate and 1,2-ethanedithiol (PEGDA-EDT) and antioxidants (AA-2G), and ROS-triggered release of AA-2G from microfibers to detoxify the excess ROS...
October 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29036932/electrospun-chitosan-gelatin-biopolymer-composite-nanofibers-for-horseradish-peroxidase-immobilization-in-a-hydrogen-peroxide-biosensor
#8
Siriwan Teepoo, Phanphruk Dawan, Naris Barnthip
A biosensor based on chitosan-gelatin composite biopolymers nanofibers is found to be effective for the immobilization of horseradish peroxidase to detect hydrogen peroxide. The biopolymer nanofibers were fabricated by an electrospining technique. Upon optimization of synthesis parameters, biopolymers nanofibers, an average of 80 nm in diameter, were obtained and were then modified on the working electrode surface. The effects of the concentration of enzyme, pH, and concentration of the buffer and the working potential on the current response of the nanofibers-modified electrode toward hydrogen peroxide were optimized to obtain the maximal current response...
October 15, 2017: Biosensors
https://www.readbyqxmd.com/read/29035804/green-electrospun-and-crosslinked-poly-vinyl-alcohol-poly-acrylic-acid-composite-membranes-for-antibacterial-effective-air-filtration
#9
Miaomiao Zhu, Dawei Hua, Hui Pan, Fei Wang, Bella Manshian, Stefaan J Soenen, Ranhua Xiong, Chaobo Huang
Air pollution has become a major environmental concern given the ever increasing levels of particulate matter (PM) and the increased in treatment-resistant bacterial and viral strains. Major efforts are therefore required into the development of air filtration and purification technology as well as novel, alternative antiviral and antibacterial treatment modalities. Here, we report an environmentally friendly method for the generation of multifunctional poly(vinyl alcohol)/poly(acrylic acid) (PVA-PAA) composite membranes via green electrospinning and thermal crosslinking...
October 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29033499/fabrication-and-characterization-of-electrospun-thermoplastic-polyurethane-fibroin-small-diameter-vascular-grafts-for-vascular-tissue-engineering
#10
E Yu, J Zhang, J A Thomson, L-S Turng
The demand for small-diameter blood vessel substitutes has been increasing due to a shortage of autograft vessels and problems with thrombosis and intimal hyperplasia with synthetic grafts. In this study, hybrid small-diameter vascular grafts made of thermoplastic polyurethane (TPU) and silk fibroin, which possessed a hybrid fibrous structure of an aligned inner layer and a random outer layer, were fabricated by the electrospinning technique using a customized striated collector that generated both aligned and random fibers simultaneously...
November 2016: Int Polym Process
https://www.readbyqxmd.com/read/29032216/gelatin-oxidized-carboxymethyl-cellulose-blend-based-tubular-electrospun-scaffold-for-vascular-tissue-engineering
#11
Jincy Joy, Jessica Pereira, Rachida Aid-Launais, Graciela Pavon-Djavid, Alok R Ray, Didier Letourneur, Anne Meddahi-Pellé, Bhuvanesh Gupta
The present work deals with the fabrication of electrospun tubular scaffold based on in-situ crosslinked blend of gelatin - oxidized carboxymethyl cellulose (OCMC) for vascular tissue engineering. The flow behavior and spinability of the hydrogel despite the in-situ crosslinked gelatin chains evaluated by Raman spectroscopic studies and rheological studies was utilized for electrospinning. The study highlights the tunable pore size and fiber diameter of the nanofibers with the manipulation of electrospinning parameters...
October 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29031961/fabrication-of-cobalt-ferrite-cobalt-sulfide-hybrid-nanotubes-with-enhanced-peroxidase-like-activity-for-colorimetric-detection-of-dopamine
#12
Zezhou Yang, Yun Zhu, Maoqiang Chi, Ce Wang, Yen Wei, Xiaofeng Lu
The development of highly sensitive and low-cost biosensors for the detection of dopamine is of paramount importance for medical diagnostics. Herein, we report the preparation of a new peroxidase-like catalyst with a uniform heterostructure by using a technique involving electrospinning, annealing and solvothermal reaction. In this catalyst system, cobalt sulfide (CoS) nanoparticles were homogenously distributed and supported on the surface of cobalt ferrite (CoFe2O4) nanotubes. The as-prepared CoFe2O4/CoS hybrid nanotubes showed remarkably high catalytic efficiency as peroxidase mimics toward the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H2O2...
September 28, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29031922/catechin-loaded-plga-submicron-sized-fibers-reduce-levels-of-reactive-oxygen-species-induced-by-mwcnt-in-vitro
#13
Roxana E Ghitescu, Ana Maria Popa, Angela Schipanski, Cordula Hirsch, Gökce Yazgan, Valentin I Popa, René M Rossi, Katharina Maniura-Weber, Giuseppino Fortunato
Reactive oxygen species (ROS) are common products of normal aerobic cellular metabolism, but high levels of ROS lead to oxidative stress and cellular damage. Therefore, effective antioxidant therapies are needed to prevent ROS overproduction. This study reports the development of poly(l-lactide-co-glycolide) (PLGA) bicomponent fibers loaded with selected amounts of the natural polyphenolic antioxidant catechin. Thereby a novel route based on emulsion electrospinning is investigated to obtain tailored and sustained release rates for chatechin...
October 11, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/29030663/extraction-of-micrornas-from-biological-matrices-with-titanium-dioxide-nanofibers
#14
Luis A Jimenez, Marissa A Gionet-Gonzales, Sabrina Sedano, Jocelyn G Carballo, Yomara Mendez, Wenwan Zhong
MicroRNAs (miRNAs) are small RNAs that bind to mRNA targets and regulate their translation. A functional study of miRNAs and exploration of their utility as disease markers require miRNA extraction from biological samples, which contain large amounts of interfering compounds for downstream RNA identification and quantification. The most common extraction methods employ silica columns or the TRIzol reagent but give out low recovery for small RNAs probably due to their short strand lengths. Herein, we fabricated the titanium dioxide nanofibers using electrospinning to facilitate miRNA extraction and developed the optimal buffer conditions to improve miRNA recovery from biological matrices of cell lysate and serum...
October 13, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29030306/electrospraying-of-microfluidic-encapsulated-cells-for-the-fabrication-of-cell-laden-electrospun-hybrid-tissue-constructs
#15
L Weidenbacher, A Abrishamkar, M Rottmar, A G Guex, K Maniura-Weber, A J deMello, S J Ferguson, R M Rossi, G Fortunato
The fabrication of functional 3D tissues is a major goal in tissue engineering. While electrospinning is a promising technique to manufacture a structure mimicking the extracellular matrix, cell infiltration into electrospun scaffolds remains challenging. The robust and in situ delivery of cells into such biomimetic scaffolds would potentially enable the design of tissue engineered constructs with spatial control over cellular distribution but often solvents employed in the spinning process are problematic due to their high cytotoxicity...
October 10, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29030303/electrospun-formulations-of-bevacizumab-for-sustained-release-in-the-eye
#16
Ukrit Angkawinitwong, Sahar Awwad, Peng T Khaw, Steve Brocchini, Gareth R Williams
Medicines based on vascular endothelial growth factor (VEGF) neutralising antibodies such as bevacizumab have revolutionized the treatment of age related macular degeneration (AMD), a common blinding disease, and have great potential in preventing scarring after surgery or accelerating the healing of corneal injuries. However, at present, frequent invasive injections are required to deliver these antibodies. Such administration is uncomfortable for patients and expensive for health service providers. Much effort is thus focused on developing dosage forms that can be administered less frequently...
October 10, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29028539/electrospun-polycaprolactam-manganese-oxide-fiber-for-headspace-solid-phase-microextraction-of-phthalate-esters-in-water-samples
#17
Niloufar Eskandarpour, Hassan Sereshti
The nanofibrous polycaprolactam (polyamide 6 (PA6)) incorporated with manganese oxide (MnO) nanoparticles was fabricated by electrospinning and used as a new fiber coating for headspace-solid phase microextraction (HS-SPME) of the selected phthalate esters (PEs) in water samples prior to GC-μECD. The adsorbent was fully characterized using scanning electron microscopy (SEM), Fourier transform-infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). The main parameters that affect the HS-SPME efficiency such as extraction temperature, ionic strength, extraction and desorption times were investigated...
October 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29027978/feedback-system-control-optimized-electrospinning-for-fabrication-of-an-excellent-superhydrophobic-surface
#18
Jian Yang, Chuangui Liu, Boqian Wang, Xianting Ding
Superhydrophobic surface, as a promising micro/nano material, has tremendous applications in biological and artificial investigations. The electrohydrodynamics (EHD) technique is a versatile and effective method for fabricating micro- to nanoscale fibers and particles from a variety of materials. A combination of critical parameters, such as mass fraction, ratio of N, N-Dimethylformamide (DMF) to Tetrahydrofuran (THF), inner diameter of needle, feed rate, receiving distance, applied voltage as well as temperature, during electrospinning process, to determine the morphology of the electrospun membranes, which in turn determines the superhydrophobic property of the membrane...
October 13, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29026645/synthesis-and-characterization-of-collagen-plga-biodegradable-skin-scaffold-fibers
#19
Alireza Sadeghi-Avalshahr, Samira Nokhasteh, Amir Mahdi Molavi, Mohammad Khorsand-Ghayeni, Meysam Mahdavi-Shahri
The aim of this study is to investigate the applicability of poly(lactic-co-glycolic acid) (PLGA)/collagen composite scaffold for skin tissue engineering. PLGA and collagen were dissolved in HFIP as a common solvent and fibrous scaffolds were prepared by electrospinning method. The scaffolds were characterized by scanning electron microscopy (SEM), FTIR spectroscopy, mercury porosimetry, tensile strength, biocompatibility assays and Biodegradation. Cytotoxicity and cell adhesion were tested for two cell line groups, human dermal fibroblast (HDF) and human keratinocyte (HaCat)...
October 2017: Regenerative Biomaterials
https://www.readbyqxmd.com/read/29025660/electrospun-carboxyl-multi-walled-carbon-nanotubes-grafted-polyhydroxybutyrate-composite-nanofibers-membrane-scaffolds-preparation-characterization-and-cytocompatibility
#20
Cai Zhijiang, Zhu Cong, Guo Jie, Zhang Qing, Zhao Kongyin
Electrospun polyhydroxybutyrate (PHB)/carboxyl multi-walled carbon nanotubes grafted polyhydroxybutyrate (CMWCNT-g-PHB) composite nanofibers scaffolds were fabricated by electrospinning technology. The grafted product CMWCNT-g-PHB was prepared by condensation reactions between the carboxyl groups of CMWCNT and hydroxyl groups of PHB molecules and characterized by FTIR, XRD, XPS, TG and TEM measurements. The surface morphology, hydrophilicity and tensile mechanical properties of the electrospun PHB/CMWCNT-g-PHB composite nanofibers membrane scaffolds were investigated...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
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