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https://www.readbyqxmd.com/read/29346721/emulsion-electrospinning-of-polytetrafluoroethylene-ptfe-nanofibrous-membranes-for-high-performance-triboelectric-nanogenerators
#1
Pengfei Zhao, Navneet Soin, K Prashanthi, Jinkai Chen, Shurong Dong, Erping Zhou, Zhigang Zhu, Anand Arcot Narasimulu, Carlo D Montemagno, Liyang Yu, Jikui Luo
Electrospinning is a simple, versatile technique for fabricating fibrous nanomaterials with the desirable features of extremely high porosities and large surface areas. Using emulsion electrospinning, polytetrafluoroethylene/polyethene oxide (PTFE/PEO) membranes were fabricated followed by a sintering process to obtain pure PTFE fibrous membranes, which were further utilised against a polyamide 6 (PA6) membrane for vertical contact-mode triboelectric nanogenerators (TENGs). Electrostatic force microscopy (EFM) measurements of the sintered electrospun PTFE membranes revealed the presence of both positive and negative surface charges owing to the transfer of positive charge from PEO which further corroborated by FTIR measurements...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29345940/environment-modulated-crystallization-of-cu2o-and-cuo-nanowires-by-electrospinning-and-their-charge-storage-properties
#2
Midhun Harilal, Syam G Krishnan, Bhupender Pal, Mogalahalli Venkatashamy Reddy, Mohd Hasbi Ab Rahim, Mashitah Mohd Yusoff, Rajan Jose
This article reports synthesis of cuprous oxide (Cu2O) and cupric oxide (CuO) nanowires by controlling calcination environment of electrospun polymeric nanofibers and their charge storage properties. The Cu2O nanowires showed higher surface area (86 m2 g-1) and pore size than the CuO nanowires (36 m2 g-1). Electrochemical analysis was carried out in 6 M KOH and both the electrodes showed battery-type charge storage mechanism. The electrospun Cu2O electrodes delivered high discharge capacity (126 mA h g-1) than CuO (72 mA h g-1) at a current density of 2...
January 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29341492/development-of-a-bi-modal-in-situ-crosslinking-method-to-achieve-multi-factor-release-from-electrospun-gelatin
#3
Alysha P Kishan, Taneidra Walker, Nick Sears, Thomas Wilems, Elizabeth M Cosgriff-Hernandez
To better mimic native tissue microenvironments, current efforts have moved beyond single growth factor delivery to more complex multiple growth factor delivery with distinct release profiles. Electrospun gelatin, a widely investigated drug delivery vehicle, requires post-processing crosslinking techniques that generate a mesh with uniform crosslinking density, limiting the ability to deliver multiple factors at different rates. Herein, we describe a method to independently control release of multiple factors from a single electrospun gelatin mesh...
January 17, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29338768/binary-blend-fibber-based-capture-assay-of-circulating-tumor-cells-for-clinical-diagnosis-of-colorectal-cancer
#4
Ai-Wei Lee, Fu-Xiang Lin, Po-Li Wei, Guo Jian-Wei, Jem-Kun Chen
BACKGROUND: In addition to conventional approaches, detecting and characterizing CTCs in patient blood allows for early diagnosis of cancer metastasis. METHODS: We blended poly(ethylene oxide) (PEO) into nylon-6 through electrospinning to generate a fibrous matbased circulating tumour cells (CTCs) assay. The contents of nylon-6 and PEO in the electrospun blend fibrous mats (EBFMs) were optimized to facilitate high cell-substrate affinity and low leukocyte adsorption...
January 16, 2018: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29338185/injectable-and-thermo-sensitive-hydrogel-and-pdlla-electrospun-nanofiber-membrane-composites-for-guided-spinal-fusion
#5
Ying Qu, BeiYu Wang, Bingyang Chu, Chenlu Liu, Xin Rong, Hua Chen, JinRong Peng, Zhiyong Qian
Spinal fusion is the classic treatment to achieve spinal stability for the treatment of the spinal disease. Generally, spinal fusion still has to combine a certain of bone matrix for promoting bone formation to achieve the desired fusion effect based on the surgery, including the traditional bone matrix, such as the autologous bone, allografts and xenografts. Nevertheless, some problems still existed such as the immunogenic problems, the secondary wound, and pathogenic transfer and so on. Here the injectable thermosensitive hydrogel could substitute to avoid the problems as a potential biological scaffold for tissue engineering...
January 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29335498/stretchable-electrospun-pvdf-hfp-co-zno-nanofibers-as-piezoelectric-nanogenerators
#6
Hemalatha Parangusan, Deepalekshmi Ponnamma, Mariam Al Ali Al-Maadeed
Herein, we investigate the morphology, structure and piezoelectric performances of neat polyvinylidene fluoride hexafluoropropylene (PVDF-HFP) and PVDF-HFP/Co-ZnO nanofibers, fabricated by electrospinning. An increase in the amount of crystalline β-phase of PVDF-HFP has been observed with the increase in Co-doped ZnO nanofiller concentration in the PVDF-HFP matrix. The dielectric constants of the neat PVDF-HFP and PVDF-HFP/2 wt.% Co-ZnO nanofibers are derived as 8 and 38 respectively. The flexible nanogenerator manipulated from the polymer nanocomposite (PVDF-HFP/Co-ZnO) exhibits an output voltage as high as 2...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335199/3-d-mineralized-silk-fibroin-polycaprolactone-composite-scaffold-modified-with-polyglutamate-conjugated-with-bmp-2-peptide-for-bone-tissue-engineering
#7
Jingjing Luo, Haitao Zhang, Jiang Zhu, Xiaokang Cui, Junjiu Gao, Xin Wang, Jie Xiong
In the field of bone tissue engineering, an ideal three-dimensional (3-D) scaffold should not only structurally mimic the extracellular matrix (ECM) in large tissues but also mechanically support the bone healing process and provide biochemical cues to induce osteogenesis. In this study, we investigated the feasibility of functionalisation of scaffolds by coupling polyglutamate acid conjugated with BMP-2 peptide onto silk fibroin (SF)/polycaprolactone (PCL) (SF/PCL) blend nanofibers. The morphology, composition, and mineralisation, were confirmed by FE-SEM, XRD, and FT-IR spectroscopy...
December 28, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29333738/antibacterial-and-antifungal-activity-of-poly-lactic-acid-bovine-lactoferrin-nanofiber-membranes
#8
Raul Machado, André da Costa, Dina M Silva, Andreia C Gomes, Margarida Casal, Vitor Sencadas
Antimicrobial materials have become relevant for local therapies preventing microbial resistance induced by systemic antibiotic treatments. This work reports the development of electrospun poly(lactic acid) (PLLA) nanofiber membranes loaded with bovine lactoferrin (bLF) up to 20 wt%. The membranes present smooth and nondefective fibers with mean diameters between 717 ± 197 and 495 ± 127 nm, and an overall porosity of ≈80%. The hydrophobicity of the PLLA membranes is reduced by the presence of bLF. The release profile of bLF correlates with an anomalous transport model, with 17...
January 15, 2018: Macromolecular Bioscience
https://www.readbyqxmd.com/read/29331927/honeycomb-like-polysulphone-polyurethane-nanofiber-filter-for-the-removal-of-organic-inorganic-species-from-air-streams
#9
Xin Chen, Yang Xu, Meimei Liang, Qinfei Ke, Yuanyuan Fang, He Xu, Xiangyu Jin, Chen Huang
Nanofiber nonwoven filters, especially those prepared by electrospinning, are of particular interest because of their high filtration efficiency. However, existing electrospun filters suffer from inherent limitations in that both strengths and filtration resistances of the filters leave much to be desired. Herein, we present a novel nonwoven filter that is composed of polysulphone and polyurethane nanofibers. By mimicking the honeycomb structure, a heterogeneous distribution of both fiber diameter and fiber density has been achieved...
January 8, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29331580/local-delivery-of-mometasone-furoate-from-an-eluting-endotracheal-tube
#10
Abu Ammar Aiman, Maayan Gruber, Patrick Martin, Ohad Stern, Forsan Jahshan, Offir Ertracht, Eyal Sela, Samer Srouji, Eyal Zussman
Laryngeal and tracheal morbidity is a common complication of endotracheal tube (ETT)-based airway management, and manifests as local irritation, inflammation, and edema. Systemic corticosteroids are commonly administered to manage these conditions; however, their efficacy is inadequate and limited by potential severe side effects. In the present study, a steroid delivery system for local therapy was developed to generate relatively high local drug concentrations and to improve drug efficacy. ETTs were coated with electrospun poly (lactic-co-glycolic acid) (PLGA) nanofibers loaded with mometasone furoate (MF), creating a microscale thick layer...
January 10, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29329076/attachment-of-nanoparticulate-drug-release-systems-on-poly-%C3%AE%C2%B5-caprolactone-nanofibers-via-a-graftpolymer-as-interlayer
#11
Dominik de Cassan, Steffen Sydow, Nadeschda Schmidt, Peter Behrens, Yvonne Roger, Andrea Hoffmann, Anna Lena Hoheisel, Birgit Glasmacher, Robert Hänsch, Henning Menzel
Electrospun poly(ε-caprolactone) (PCL) fiber mats are modified using a chitosan grafted with PCL (CS-g-PCL), to improve the biological performance and to enable further modifications. The graft copolymer is immobilized by the crystallization of the PCL grafts on the PCL fiber surface as binding mechanism. In this way, the surface of the fibers is covered with chitosan bearing cationic amino groups, which allow adsorption of oppositely charged nanoparticulate drug-delivery systems. The modification of the fiber mats and the attachment of the drug delivery systems are easy and scalable dip processes...
December 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29327741/fabrication-and-assessment-of-an-electrospun-polymeric-microfiber-based-platform-under-bulk-flow-conditions-with-rapid-and-efficient-antigen-capture
#12
Carlton F O Hoy, Keiichiro Kushiro, Madoka Takai
This study investigated the fabrication and proof of concept design demonstrating rapid and highly sensitive antigen capture utilizing electrospun polystyrene (PS) microfiber mat substrates paired with vacuum pump pressurization to induce bulk flow. In comparison with conventional flat PS surfaces used for immunoassay purposes, this system optimizes the increased surface area of the electrospun polystyrene (ESPS) fiber mat substrates and the accelerated propagation of the antigen through the detection platform by using a vacuum pump to enable efficient and rapid antigen capture...
January 12, 2018: Analyst
https://www.readbyqxmd.com/read/29327486/ir-driven-ultrafast-transfer-of-plasmonic-hot-electrons-in-nonmetallic-branched-heterostructures-for-enhanced-h2-generation
#13
Zhenyi Zhang, Xiaoyi Jiang, Benkang Liu, Lijiao Guo, Na Lu, Li Wang, Jindou Huang, Kuichao Liu, Bin Dong
The ultrafast transfer of plasmon-induced hot electrons is considered an effective kinetics process to enhance the photoconversion efficiencies of semiconductors through strong localized surface plasmon resonance (LSPR) of plasmonic nanostructures. Although this classical sensitization approach is widely used in noble-metal-semiconductor systems, it remains unclear in nonmetallic plasmonic heterostructures. Here, by combining ultrafast transient absorption spectroscopy with theoretical simulations, IR-driven transfer of plasmon-induced hot electron in a nonmetallic branched heterostructure is demonstrated, which is fabricated through solvothermal growth of plasmonic W18 O49 nanowires (as branches) onto TiO2 electrospun nanofibers (as backbones)...
January 12, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29327436/effect-of-patterned-electrospun-hierarchical-structures-on-alignment-and-differentiation-of-mesenchymal-stem-cells-biomimicking-bone
#14
Sharanya Sankar, Manohar Kakunuri, Sindhuja D E, Chandra S Sharma, Subha N Rath
Considering the complex hierarchical structure of bone, biomimicking the micro and nano level features should be an integral part of scaffold fabrication for successful bone regeneration. We aim to biomimic the micro- and nano-structure of bone and study the effect of physical cues on cell alignment, proliferation and differentiation. To achieve this, we have divided the scaffolds into groups: electrospun SU-8 nanofibers, electrospun SU-8 nanofibers with UV treatment and micropatterned (20 μm sized ridges and grooves) SU-8 nanofibers by photolithography with UV treatment...
January 11, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29325209/branch-like-iron-nitride-and-carbide-magnetic-fibres-via-electrospinning-technique
#15
Alfonso García-Márquez, Stefan Glatzel, Alexander Kraupner, Klaus Kiefer, Konrad Siemensmeyer, Cristina Giordano
Fe3N and Fe3C nanocomposites have a wide range of applications thanks to their ceramic nature, magnetic properties, conductivity and catalytic activity, just to cite some. In many fields optimal performances are ensured by crystallinity, homogeneity and hierarchical organization. In the present paper, crystalline, magnetic and well-defined nanofibres of iron nitride and iron carbide/carbon nanocomposite with tunable composition and size were prepared via electrospinning. The starting polymeric material was directly electrospun into fibres and then calcined, leading to a highly homogeneous final product of nanoparticles along the fibres (both outside and inside)...
January 11, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29318250/razor-printed-sticker-microdevices-for-cell-based-applications
#16
Loren E Stallcop, Yasmín R Álvarez-García, Ana M Reyes-Ramos, Karla P Ramos-Cruz, Molly M Morgan, Yatao Shi, Lingjun Li, David J Beebe, Maribella Domenech, Jay W Warrick
Tape-based razor-printing is a flexible and affordable ultra-rapid prototyping approach for microscale device fabrication. However, integration of this prototyping approach into cell-based assay development has been limited to proof of principle demonstrations. This is in large part due to lack of an established or well-characterized option for biocompatible adhesive tape. Without such an option, integration of these areas will remain unexplored. Therefore, to address this critical hurdle, we characterized microscale devices made using a potentially biocompatible double-sided adhesive, ARCare 90106...
January 10, 2018: Lab on a Chip
https://www.readbyqxmd.com/read/29316684/a-tensile-constitutive-relationship-and-a-finite-element-model-of-electrospun-nanofibrous-mats
#17
Yunlei Yin, Zhongxiang Pan, Jie Xiong
It is difficult to establish a numerical model for a certain structure of electrospun nanofibrous mats, due to their high porosity and non-linear characteristics, that can fully consider these characteristics and describe their mechanical behaviors. In this paper, an analytical method of meso-mechanics was adopted to establish the tensile constitutive relationship between a single fiber and mats from fiber-web microstructures. Meanwhile, a macroscopic finite element model was developed and verified through uniaxial tensile stress-strain experimental data of silk fibroin (SF)/polycaprolactone (PCL) nanofibrous mats...
January 8, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29316144/quantitative-comparison-of-enzyme-immobilization-strategies-for-glucose-biosensing-in-real-time-using-fast-scan-cyclic-voltammetry-coupled-with-carbon-fiber-microelectrodes
#18
Samantha K Smith, Leyda Z Lugo-Morales, Christina Tang, Saahj P Gosrani, Christie A Lee, James G Roberts, Stephen W Morton, Gregory S McCarty, Saad A Khan, Leslie A Sombers
Electrochemical monitoring of non-electroactive species requires a biosensor that is stable and selective, with sensitivity to physiological concentrations of targeted analytes. We have combined glucose oxidase-modified carbon-fiber microelectrodes with fast-scan cyclic voltammetry for real-time measurements of glucose fluctuations in brain tissue. Work presented herein quantitatively compares three approaches to enzyme immobilization on the microelectrode surface - physical adsorption, hydrogel entrapment, and entrapment in electrospun nanofibers...
January 9, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29314595/fabrication-and-characterization-of-polymer-ceramic-nanocomposites-containing-drug-loaded-modified-halloysite-nanotubes
#19
Maedeh Ghaderi-Ghahfarrokhi, Vahid Haddadi-Asl, Seyed Shahrooz Zargarian
Modified halloysite nanotubes (HNT-NH2 and HNT-COOH) were synthesized by a coupling reaction with 3-amino- propyltriethoxysilane (APTES) and maleic anhydride from hydroxyl groups of neat halloysite nanotubes (HNTs). Successful attachment of functional groups onto HNTs was evaluated by FTIR and TGA. XRD was used to study the crystalline structure of scaffolds and the formation of intercalated structure as a result of improved dispersion and decreased agglomeration of modified nanoparticles. Neat HNT, HNT-NH2 and HNT-COOH were subsequently introduced into Polycaprolactone/Pluronic P123 (PCL/P123) electrospun substrate...
January 3, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29313254/aligned-electrospun-fibers-for-neural-patterning
#20
Erfan Soliman, Fabio Bianchi, James N Sleigh, Julian H George, M Zameel Cader, Zhanfeng Cui, Hua Ye
OBJECTIVES: To test a 3D approach for neural network formation, alignment, and patterning that is reproducible and sufficiently stable to allow for easy manipulation. RESULTS: A novel cell culture system was designed by engineering a method for the directional growth of neurons. This uses NG108-15 neuroblastoma x glioma hybrid cells cultured on suspended and aligned electrospun fibers. These fiber networks improved cellular directionality, with alignment angle standard deviations significantly lower on fibers than on regular culture surfaces...
January 8, 2018: Biotechnology Letters
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