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https://www.readbyqxmd.com/read/28813013/recent-advances-in-electrospun-nanofiber-interfaces-for-biosensing-devices
#1
REVIEW
Eleni Sapountzi, Mohamed Braiek, Jean-François Chateaux, Nicole Jaffrezic-Renault, Florence Lagarde
Electrospinning has emerged as a very powerful method combining efficiency, versatility and low cost to elaborate scalable ordered and complex nanofibrous assemblies from a rich variety of polymers. Electrospun nanofibers have demonstrated high potential for a wide spectrum of applications, including drug delivery, tissue engineering, energy conversion and storage, or physical and chemical sensors. The number of works related to biosensing devices integrating electrospun nanofibers has also increased substantially over the last decade...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28812762/a-facile-synthesis-of-cufe2o4-cu9s8-ppy-ternary-nanotubes-as-peroxidase-mimics-for-the-sensitive-colorimetric-detection-of-h2o2-and-dopamine
#2
Zezhou Yang, Fuqiu Ma, Yun Zhu, Sihui Chen, Ce Wang, Xiaofeng Lu
Synergistic effects play an important role in improving the catalytic activity for enzyme-like reactions. Compared to individual nanomaterials, a system consisting of multiple components usually exhibits enhanced catalytic activity as an enzyme mimic. Herein we describe the synthesis of CuFe2O4/Cu9S8/polypyrrole (PPy) ternary nanotubes as an efficient peroxidase mimic via a three-step approach involving an electrospinning process, annealing treatment and hydrothermal reaction. The remarkably enhanced catalytic activity of CuFe2O4/Cu9S8/PPy ternary nanotubes as peroxidase mimics over individual CuFe2O4 nanofibers, CuFe2O4/CuO composite nanofibers, CuFe2O4/CuS composite nanofibers, and PPy materials has been achieved, demonstrating the presence of a synergistic effect among the components...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28812354/3d-moldable-nanofiber-reinforced-transparent-composites-with-hierarchically-self-assembled-reverse-nacre-like-architecture
#3
Subir Kumar Biswas, Hironari Sano, Md Iftekhar Shams, Hiroyuki Yano
Achieving structural hierarchy and a uniform nanofiller dispersion simultaneously remains highly challenging for obtaining a robust polymer nanocomposite of immiscible components. In this study, a remarkably facile Pickering emulsification approach is developed to fabricate hierarchical composites of immiscible acrylic polymer and native cellulose nanofibers by taking advantage of the dual role of the nanofibers as both the emulsion stabilizer and polymer reinforcement. The composites feature a unique "reverse" nacre-like microstructure reinforced with well-dispersed two-tier hierarchical nanofiber network, leading to a synergistic high strength, modulus, and toughness (20, 50, and 53 times that of neat polymer, respectively), high optical transparency (89%), high flexibility and a drastically low thermal expansion (13 ppm/K, 1/15th of the neat polymer)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812342/achieving-a-collapsible-strong-and-highly-thermally-conductive-film-based-on-oriented-functionalized-boron-nitride-nanosheets-and-cellulose-nanofiber
#4
Kai Wu, Jinchao Fang, Jinrui Ma, Rui Huang, Songgang Chai, Feng Chen, Qiang Fu
Boron nitride nanosheets (BNNS) film receives wide attention in both academia and industry due to its high thermal conductivity (TC) and good electrical insulation capability. However, the brittleness and low strength of BNNS film largely limit its application. Herein, functionalized BNNS (f-BNNS) with well-maintained in-plane crystalline structure was firstly prepared utilizing urea in the aqueous solution via ball-milling for the purpose of improving its stability in water and enhancing the interaction with polymer matrix...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809535/ternary-organic-solar-cells-with-coumarin7-as-the-donor-exhibiting-over-10-power-conversion-efficiency-and-a-high-fill-factor-of-75
#5
Xinwei Chen, Si-Lu Tao, Cong Fan, Dongcheng Chen, Ling Zhou, Hui Lin, Cai-Jun Zheng, Shi-Jian Su
Ternary bulk heterojunction (BHJ) is a brilliant photovoltaic technology for improving the performance of organic solar cells (OSCs), since the light absorption range can be significantly extended by using multiple donors or acceptor materials. In this paper, coumarin7 (C7), a small organic molecule typical led used in organic light-emitting diodes, was initially exploited as second electron-donor component in ternary bulk heterojunction OSCs along with conventional blend system spolythieno[3,4-b]-thiophene/benzodithiophene(PTB7) and [6,6]-phenyl-C71 -butyric acid methyl(PC71 BM)...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809504/influence-of-particle-size-and-loading-on-particle-accessibility-in-electrospun-poly-ethylene-oxide-and-zif-8-composite-fibers-experiments-and-theory
#6
Mitchell R Armstrong, Christopher Balzer, Bohan Shan, Bin Mu
Developing electrospun nanofiber/ nanoparticle composites (ENNCs) is an emerging strategy for immobilizing functional particles for a variety of applications. The radial location of the particle along the fiber, either at the surface or in the bulk, has implication into the resulting properties. To explore particle location along fibers, ZIF-8 impregnated poly(ethylene oxide) (PEO) nanofibers are formed by electrospinning particle suspensions. Fibers impregnated with two different ZIF-8 particle sizes (200 nm and 12...
August 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28808812/antioxidant-effects-of-chrysin-loaded-electrospun-nanofibrous-mats-on-proliferation-and-stemness-preservation-of-human-adipose-derived-stem-cells
#7
Yaghoub Deldar, Faraz Zarghami, Younes Pilehvar-Soltanahmadi, Mehdi Dadashpour, Nosratollah Zarghami
An ideal biomaterial in regenerative medicine should be able to regulate the stem cell proliferation without the loss of its pluripotency. Chrysin (Chr) is a naturally occurring flavone with a wide spectrum of biological functions including anti-inflammatory and anti-oxidant properties. The present study describes the influence of Chr-loaded nanofibrous mats on the regulation of proliferation and stemness preservation of adipose-derived stem cells (ADSCs). For this purpose, Chr-loaded poly (ε-caprolactone)/poly (ethylene glycol) (PCL/PEG) nanofibrous mats were produced via electrospinning process and the successful fabrication of these bioactive mats was confirmed by field emission scanning electron microscopy (FE-SEM) and fourier transform infrared spectroscopy...
August 14, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28808708/a-graphitic-edge-plane-rich-meso-porous-carbon-anode-for-alkaline-water-electrolysis
#8
Dongyoon Shin, Myounghoon Choun, Hyung Chul Ham, Jae Kwang Lee, Jaeyoung Lee
There is growing interest in alkaline water electrolysis as a sustainable approach for producing hydrogen, but developing efficient and inexpensive catalysts for the oxygen evolution reaction, which can limit the operational efficiency of water electrolysis due to its considerable overpotential, is regarded as the most overriding challenge. Therefore, significant progress has been made in developing catalysts with transition metal and carbon materials as alternative catalysts. Here, we prepared cobalt containing carbon nanofibers via a facile route of electrospinning and pyrolysis, and metal leached carbon nanofibers were also prepared by subsequently leaching the metal...
August 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28806658/hierarchically-structured-tio2-pan-nanofibrous-membranes-for-high-efficiency-air-filtration-and-toluene-degradation
#9
Jiafei Su, Guohong Yang, Cuilian Cheng, Chen Huang, He Xu, Qinfei Ke
Hierarchically structured, nanoparticle-on-nanofiber composite membranes were successfully prepared by electrospray of titanium dioxide (TiO2) suspensions and electrospinning of polyacrylonitrile (PAN) solution simultaneously. The results showed that the TiO2 nanoparticles were highly dispersed on the surface of PAN nanofibers to construct hierarchical nanostructures, which could not only endow the composite membrane with high photocatalytic activity but also further improve the filter efficiency of the composite membrane...
July 29, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28805881/carbon-nanofiber-high-frequency-nanomechanical-resonators
#10
Jaesung Lee, Anupama B Kaul, Philip X-L Feng
Carbon nanofibers (CNFs) synthesized using a plasma-enhanced chemical vapor deposition (PECVD) process are investigated as a new class of building blocks for high-frequency vibrating nanomechanical resonators. The CNF resonators are prototyped by using vertically oriented few-μm-long cantilever-structured CNFs grown by PECVD. Undriven thermomechanical motions and photothermally driven resonances are measured in the frequency range of ∼3-10 MHz, which exhibit quality (Q) factors of ∼140-350 in moderate vacuum (milliTorr) at room temperature...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28805554/apitherapeutics-and-phage-loaded-nanofibers-as-wound-dressings-with-enhanced-wound-healing-and-antibacterial-activity
#11
Wessam A Sarhan, Hassan Me Azzazy
AIM: Develop green wound dressings which exhibit enhanced wound-healing ability and potent antibacterial effects. METHODS: Honey, polyvinyl alcohol, chitosan nanofibers were electrospun and loaded with bee venom, propolis and/or bacteriophage against the multidrug-resistant Pseudomonas aeruginosa and examined for their antibacterial, wound-healing ability and cytotoxicity. RESULTS: Among different formulations of nanofibers, honey, polyvinyl alcohol, chitosan-bee venom/bacteriophage exhibited the most potent antibacterial activity against all tested bacterial strains (Gram-positive and -negative strains) and achieved nearly complete killing of multidrug-resistant P...
August 14, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28805042/fabrication-and-characterization-of-electrospun-laminin-functionalized-silk-fibroin-poly-ethylene-oxide-nanofibrous-scaffolds-for-peripheral-nerve-regeneration
#12
Mina Rajabi, Masoumeh Firouzi, Zahra Hassannejad, Ismaeil Haririan, Payam Zahedi
The peripheral nerve regeneration is still one of the major clinical problems, which has received a great deal of attention. In this study, the electrospun silk fibroin (SF)/poly(ethylene oxide) (PEO) nanofibrous scaffolds were fabricated and functionalized their surfaces with laminin (LN) without chemical linkers for potential use in the peripheral nerve tissue engineering. The morphology, surface chemistry, thermal behavior and wettability of the scaffolds were examined to evaluate their performance by means of scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC) and water contact angle (WCA) measurements, respectively...
August 14, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28804961/gaseous-nanocarving-mediated-carbon-framework-with-spontaneous-metal-assembly-for-structure-tunable-metal-carbon-nanofibers
#13
Dae-Hyun Nam, Sungwoo Lee, Young-Joo Lee, Jun-Hyun Jo, Euijoon Yoon, Kyung-Woo Yi, Gun-Do Lee, Young-Chang Joo
Vapor phase carbon (C)-reduction-based syntheses of C nanotubes and graphene, which are highly functional solid C nanomaterials, have received extensive attention in the field of materials science. This study suggests a revolutionary method for precisely controlling the C structures by oxidizing solid C nanomaterials into gaseous products in the opposite manner of the conventional approach. This gaseous nanocarving enables the modulation of inherent metal assembly in metal/C hybrid nanomaterials because of the promoted C oxidation at the metal/C interface, which produces inner pores inside C nanomaterials...
August 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28803478/biomimetic-bone-like-hydroxyapatite-by-mineralization-on-supramolecular-porous-fiber-networks
#14
Bo Li, Lei Kan, Xinyue Zhang, Jie Li, Ruiting Li, Qinyuan Gui, Dengli Qiu, Fei He, Ning Ma, Yapei Wang, Hao Wei
The hydroxyapatite (HA), main inorganic component of bone tissue, is mineralized with collagen fibril scaffolds during bone formation. Inspired by the process, self-assembled porous networks architecture was designed and synthesized by using the 2-ureido-4[1H]-pyrimidone (UPy) modified glycerol molecule UPy-Gly, which was further utilized as a template for biomimetic mineralization. When incubated in simulated body fluid (SBF), the HA nucleus firstly formed in the holes of the template by the induction of hydroxyls on the surface, grew along the nanofibers and fused with the template to fabricate the hydroxyapatite composites (UPy-Gly/HA)...
August 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28802690/nanoparticle-releasing-nanofiber-composites-for-enhanced-in%C3%A2-vivo-vaginal-retention
#15
Emily A Krogstad, Renuka Ramanathan, Christina Nhan, John C Kraft, Anna K Blakney, Shijie Cao, Rodney J Y Ho, Kim A Woodrow
Current approaches for topical vaginal administration of nanoparticles result in poor retention and extensive leakage. To overcome these challenges, we developed a nanoparticle-releasing nanofiber delivery platform and evaluated its ability to improve nanoparticle retention in a murine model. We individually tailored two components of this drug delivery system for optimal interaction with mucus, designing (1) mucoadhesive fibers for better retention in the vaginal tract, and (2) PEGylated nanoparticles that diffuse quickly through mucus...
August 1, 2017: Biomaterials
https://www.readbyqxmd.com/read/28801269/elastin-plga-hybrid-electrospun-nanofiber-scaffolds-for-salivary-epithelial-cell-self-organization-and-polarization
#16
Zahraa I Foraida, Tim Kamaldinov, Deirdre A Nelson, Melinda Larsen, James Castracane
Development of electrospun nanofibers that mimic the structural, mechanical and biochemical properties of natural extracellular matrices (ECMs) is a promising approach for tissue regeneration. Electrospun fibers of synthetic polymers partially mimic the topography of the ECM, however, their high stiffness, poor hydrophilicity and lack of in vivo-like biochemical cues is not optimal for epithelial cell self-organization and function. In search of a biomimetic scaffold for salivary gland tissue regeneration, we investigated the potential of elastin, an ECM protein, to generate elastin hybrid nanofibers that have favorable physical and biochemical properties for regeneration of the salivary glands...
August 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28801095/fabrication-of-chitosan-poly-lactic-acid-graphene-oxide-tio2-composite-nanofibrous-scaffolds-for-sustained-delivery-of-doxorubicin-and-treatment-of-lung-cancer
#17
Saman Samadi, Mahboubeh Moradkhani, Hoda Beheshti, Mohammad Irani, Majid Aliabadi
In this work, the synthesized graphene oxide/TiO2/doxorubicin (GO/TiO2/DOX) composites were loaded into the chitosan/poly(lactic acid) (PLA) solutions to fabricate the electrospun chitosan/PLA/GO/TiO2/DOX nanofibrous scaffolds via electrospinning process. The synthesized composites and nanofibers were characterized using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis. Three-factor three-level central composite design was used to determine the influence of PLA to chitosan ratio, TiO2/DOX content and GO/TiO2/DOX content on the release of DOX from nanofibrous scaffolds...
August 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28800464/accelerated-biomineralization-of-graphene-oxide-incorporated-cellulose-acetate-nanofibrous-scaffolds-for-mesenchymal-stem-cell-osteogenesis
#18
Xiaoyun Liu, He Shen, Saijie Song, Wei Chen, Zhijun Zhang
For bone tissue engineering, it requires that the scaffolds have excellent biocompatibility, proper mechanical and osteoinductive properties. Electrospun nanofibers with extracellular matrices mimicking structure have proven to be good scaffolds for bone tissue repairing. Hybrid nanofibers in particular, endow the nanofibers with specific and multiple functionalities, and therefore have attracted increasing interests in the recent years. In this study, we fabricated graphene oxide (GO)-incorporated cellulose acetate (CA) nanofibrous scaffolds by electrospinning technique for enhancement of biomineralization and osteogenic differentiation of human mesenchymal stem cells (hMSCs)...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28800110/response-of-dermal-fibroblasts-to-biochemical-and-physical-cues-in-aligned-polycaprolactone-silk-fibroin-nanofiber-scaffolds-for-application-in-tendon-tissue-engineering
#19
Chih-Hao Chen, Shih-Hsien Chen, Chang-Yi Kuo, Meng-Lun Li, Jyh-Ping Chen
Silk fibroin (SF) and fiber alignment were introduced into polycaprolactone (PCL)-based electrospun nanofibers as chemical and physical cues for tendon tissue engineering applications. The physicochemical properties of random PCL (RP) nanofibers, random PCL/SF (RPSF) nanofibers and aligned PCL/SF (APSF) nanofibers were characterized for fiber orientation and SF blending effects. An in vitro cell culture with rabbit dermal fibroblasts (RDFBs) on nanofibers indicated that SF promotes cell proliferation to a higher extent than fiber alignment...
August 11, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28800071/fabrication-and-characterization-of-magnesium-ferrite-based-pcl-aloe-vera-nanofibers
#20
Zanshe Thompson, Shekh Rahman, Sergey Yarmolenko, Jagannathan Sankar, Dhananjay Kumar, Narayan Bhattarai
Composite nanofibers of biopolymers and inorganic materials have been widely explored as tissue engineering scaffolds because of their superior structural, mechanical and biological properties. In this study, magnesium ferrite (Mg-ferrite) based composite nanofibers were synthesized using an electrospinning technique. Mg-ferrite nanoparticles were first synthesized using the reverse micelle method, and then blended in a mixture of polycaprolactone (PCL), a synthetic polymer, and Aloe vera, a natural polymer, to create magnetic nanofibers by electrospinning...
August 11, 2017: Materials
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