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https://www.readbyqxmd.com/read/28654883/removal-of-chromium-vi-from-aqueous-solutions-using-surface-modified-composite-nanofibers
#1
Alaa Mohamed, W S Nasser, T A Osman, M S Toprak, M Muhammed, A Uheida
A novel material composite nanofibers (PAN-CNT/TiO2-NH2) based on adsorption of Cr(VI) ions, was applied. Polyacrylonitrile (PAN) and carbon nanotube (CNTs)/titanium dioxide nanoparticles (TiO2) functionalized with amine groups (TiO2-NH2) composite nanofibers have been fabricated by electrospinning. The nanostructures and the formation process mechanism of the obtained PAN-CNT/TiO2-NH2 composite nanofibers are investigated using FTIR, XRD, XPS, SEM, and TEM. The composite nanofibers were used as a novel adsorbent for removing toxic chromium Cr(VI) in aqueous solution...
June 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28653843/scalable-and-low-cost-synthesis-of-highly-conducting-polypyrrole-nanofibers-using-oil-water-interfacial-polymerization-under-constant-stirring
#2
Jayanta Hazarika, Ashok Kumar
In the present work, we report a low cost and scalable oil-water interfacial polymerization method to synthesize one dimensional (1-D) highly conducting polypyrrole (PPy) nanofibers doped with p-Toluenesulfonic (p-TSA) and hydrochloric (HCl) acids. Polymerization of pyrrole (monomer) has been carried out at the interface formed between the immiscible oil and aqueous water droplets under constant magnetic stirring at room temperature. Formation of smaller diameter (16-20 nm) PPy nanofibers has been confirmed from the high resolution transmission electron microscopy (HRTEM) studies and average diameter of p-TSA doped PPy nanofibers is found to be smaller than that of HCl doped nanofibers...
June 27, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28653337/hardystonite-coated-poly-l-lactide-nanofibrous-scaffold-and-efficient-osteogenic-differentiation-of-adipose-derived-mesenchymal-stem-cells
#3
Banafsheh Tavangar, Shaghayegh Arasteh, Haleh Edalatkhah, Ali Salimi, Ali Doostmohammadi, Ehsan Seyedjafari
In this study, a ceramic-coated nanofibrous scaffold has been fabricated to biomimic the microstructure of natural extracellular matrix and the stiffening inorganic compartment of bone. Poly-l-lactic acid (PLLA) nanofibers were electrospun and exposed to oxygen plasma to induce hydrophilicity and promote ceramic adsorption. Hardystonite (HS), which possesses superior osteoinduction potential over hydroxyapatite, was coated on plasma-treated PLLA nanofibers by drenching the nanofibers in HS suspension. Pure and composite PLLA-based scaffolds were characterized in terms of physical and biological properties...
June 27, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28653294/electrospun-plga-nanofiber-scaffolds-release-ibuprofen-faster-and-degrade-slower-after-in-vivo-implantation
#4
Corinne N Riggin, Feini Qu, Dong Hwa Kim, Julianne Huegel, David R Steinberg, Andrew F Kuntz, Louis J Soslowsky, Robert L Mauck, Joseph Bernstein
While delayed delivery of non-steroidal anti-inflammatory drugs (NSAIDs) has been associated with improved tendon healing, early delivery has been associated with impaired healing. Therefore, NSAID use is appropriate only if the dose, timing, and mode of delivery relieves pain but does not impede tissue repair. Because delivery parameters can be controlled using drug-eluting nanofibrous scaffolds, our objective was to develop a scaffold for local controlled release of ibuprofen (IBP), and characterize the release profile and degradation both in vitro and in vivo...
June 26, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28652642/optical-fiber-ultrasound-transmitter-with-electrospun-carbon-nanotube-polymer-composite
#5
Radhika K Poduval, Sacha Noimark, Richard J Colchester, Thomas J Macdonald, Ivan P Parkin, Adrien E Desjardins, Ioannis Papakonstantinou
All-optical ultrasound transducers are promising for imaging applications in minimally invasive surgery. In these devices, ultrasound is transmitted and received through laser modulation, and they can be readily miniaturized using optical fibers for light delivery. Here, we report optical ultrasound transmitters fabricated by electrospinning an absorbing polymer composite directly onto the end-face of optical fibers. The composite coating consisting of an aqueous dispersion of multi-walled carbon nanotubes (MWCNTs) in polyvinyl alcohol was directly electrospun onto the cleaved surface of a multimode optical fiber and subsequently dip-coated with polydimethylsiloxane (PDMS)...
May 29, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28651093/the-effect-of-a-hydroxyapatite-impregnated-pcl-membrane-in-rat-subcritical-calvarial-bone-defects
#6
Monica Feresini Groppo, Paulo Henrique Caria, Alexandre Rodrigues Freire, Sidney R Figueroba, Wilson Alves Ribeiro-Neto, Rosario Elida Suman Bretas, Felippe Bevilacqua Prado, Francisco Haiter-Neto, Flavio Henrique Aguiar, Ana Claudia Rossi
OBJECTIVE: The present study evaluated the effect of polymeric-nanofibers membranes impregnated with microparticulate hydroxyapatite (HA) in the subcritical calvarial bone defects (SCBD) healing. DESIGN: PCL membranes with and without HA were obtained by electrospinning. SCBD were perforated (3.3mm) in left and right sides of 36 rat calvarias. The right-side SBCD of 18 animals was filled with HA mixed with blood clot and blood clot at the contralateral side. The remaining animals received PCL+HA membrane at the right-side SCBD and PCL membrane at the contralateral side...
June 15, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28650630/waterborne-electrospinning-of-poly-n-isopropyl-acrylamide-by-control-of-environmental-parameters
#7
Ella Schoolaert, Paulien Ryckx, Jozefien Geltmeyer, Samarendra Maji, Paul H M Van Steenberge, Dagmar R D'hooge, Richard Hoogenboom, Karen De Clerck
With increasing toxicity and environmental concerns, electrospinning from water, i.e. waterborne electrospinning, is crucial to further exploit the resulting nanofiber potential. Most water-soluble polymers have the inherent limitation of resulting in water-soluble nanofibers and a tedious chemical cross-linking step is required to reach stable nanofibers. An interesting alternative route is the use of thermoresponsive polymers, such as poly(N-isopropyl acrylamide) (PNIPAM), as they are water-soluble beneath their lower critical solution temperature (LCST) allowing low temperature electrospinning while the obtained nanofibers are water-stable above the LCST...
June 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28650116/polymeric-drug-delivery-systems-for-intraoral-site-specific-chemoprevention-of-oral-cancer
#8
REVIEW
Kashappa Goud H Desai
Oral cancer is among the most prevalent cancers in the world. Moreover, it is one of the major health problems and causes of death in many regions of the world. The traditional treatment modalities include surgical removal, radiation therapy, systemic chemotherapy, or a combination of these methods. In recent decades, there has been significant interest in intraoral site-specific chemoprevention via local drug delivery using polymeric systems. Because of its easy accessibility and clear visibility, the oral mucosa is amenable for local drug delivery...
June 26, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28650050/bilayered-nanofibrous-3d-hierarchy-as-skin-rudiment-by-emulsion-electrospinning-for-burn-wound-management
#9
Pallabi Pal, Prabhash Dadhich, Pavan Kumar Srivas, Bodhisatwa Das, Dhrubajyoti Maulik, Santanu Dhara
Mimicking skin extracellular matrix hierarchy, the present work aims to develop a bilayer skin graft comprising a porous cotton-wool-like 3D layer with membranous structure of PCL-chitosan nanofibers. Emulsion electrospinning with differential stirring periods of PCL-chitosan emulsion results in development of a bilayer 3D structure with varied morphology. The electrospun membrane has fiber diameter ∼274 nm and pore size ∼1.16 μm while fluffy 3D layer has fiber diameter ∼1.62 μm and pore size ∼62 μm...
June 26, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28649979/hot-pressed-polymer-nanofiber-supported-graphene-membrane-for-high-performance-nanofiltration
#10
Zhao Wang, Rajesh Sahadevan, Che-Ning Yeh, Todd J Menkhaus, Jiaxing Huang, Hao Fong
Graphene oxide (GO) sheets can be readily surface-overlaid on hot-pressed electrospun polyacrylonitrile (PAN) nanofiber membrane to form a continuous and crack-free layer; upon thermal reduction at 150 oC for 12 h, the resulting reduced GO (rGO) layer can reject ~90% MgSO4 with high water flux (due to the size exclusion mechanism), making the prepared PAN-rGO membranes promising nanofiltration media for water purification. It is important to note that no delamination of GO/rGO sheet layers has been observed throughout this study...
June 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28649960/gold-nanoparticles-decorated-electrospun-poly-n-vinyl-2-pyrrolidone-nanofibers-with-tunable-size-and-coverage-density-for-nanomolar-detection-of-single-and-binary-component-dyes-by-surface-enhanced-raman-spectroscopy
#11
Alfin Kurniawan, Meng-Jiy Wang
The application of the electrospun nanomaterials to surface-enhanced Raman spectroscopy (SERS) is a rapidly evolving field which holds potential for future developments in the generation of portable plasmonic-based detection platforms. In this study, a simple approach to fabricate electrospun poly(N-vinylpyrrolidone) (PVP) mats decorated with gold nanoparticles (AuNPs) by combining electrospinning and calcination was presented. AuNPs were decorated on the fiber mat surface through electrostatic interactions between positively charged aminosilane groups and negatively charged AuNPs...
June 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28649896/platelet-lysate-as-a-serum-replacement-for-skin-cell-culture-on-biomimetic-pcl-nanofibers
#12
Vera Sovkova, Karolina Vocetkova, Michala Rampichova, Andrea Mickova, Matej Buzgo, Vera Lukasova, Jana Dankova, Eva Filova, Alois Necas, Evzen Amler
Platelets are a popular source of native growth factors for tissue engineering applications. The aim of the study was to verify the use of platelet lysate as a fetal bovine serum (FBS) replacement for skin cell culture. The cytokine content of the platelet lysate was characterized using the Bio-Plex system. The cells (fibroblasts, melanocytes, and keratinocytes) were cultured on PCL nanofibrous scaffolds to mimic their natural microenvironment. The cytokine content of the platelet lysate was determined, and to the cells, a medium containing platelet lysate or platelet lysate in combination with FBS was added...
June 26, 2017: Platelets
https://www.readbyqxmd.com/read/28649631/swing-like-pool-boiling-on-nano-textured-surfaces-for-microgravity-applications-related-to-cooling-of-high-power-microelectronics
#13
Sumit Sinha-Ray, Wenshuo Zhang, Barak Stoltz, Rakesh P Sahu, Suman Sinha-Ray, Alexander L Yarin
Here, we demonstrate that heat removed in pool boiling from a heater mimicking high-power microelectronics could be used to facilitate a swing-like motion of the heater before being finally dissipated. This swing-like motion could be beneficial for shedding a large vapor bubble that encapsulates high-power heaters in microgravity where buoyancy force is unavailable for vapor bubble removal. The swing-like motion is propelled by vapor bubble recoil, the force which exists irrespective of gravity and buoyancy...
2017: NPJ Microgravity
https://www.readbyqxmd.com/read/28649573/supramolecular-self-assembly-of-a-model-hydrogelator-characterization-of-fiber-formation-and-morphology
#14
Yuan Gao, Ryan Nieuwendaal, Emilios K Dimitriadis, Boualem Hammouda, Jack F Douglas, Bing Xu, Ferenc Horkay
Hydrogels are of intense recent interest in connection with biomedical applications ranging from 3-D cell cultures and stem cell differentiation to regenerative medicine, controlled drug delivery and tissue engineering. This prototypical form of soft matter has many emerging material science applications outside the medical field. The physical processes underlying this type of solidification are incompletely understood and this limits design efforts aimed at optimizing these materials for applications. We address this general problem by applying multiple techniques (e...
December 2016: Gels
https://www.readbyqxmd.com/read/28646917/polycaprolactone-nanofiber-scaffold-enhances-the-osteogenic-differentiation-potency-of-various-human-tissue-derived-mesenchymal-stem-cells
#15
Ruyue Xue, Yuna Qian, Linhao Li, Guidong Yao, Li Yang, Yingpu Sun
BACKGROUND: Polycaprolactone (PCL) has been regarded as a promising synthetic material for bone tissue engineering application. Owing to its unique biochemical properties and great compatibility, PCL fibers have come to be explored as a potential delivering scaffold for stem cells to support bone regeneration during clinical application. METHODS: The human derived mesenchymal stem cells (MSCs) were obtained from umbilical cord (UC), bone marrow (BM), and adipose tissue (AD), respectively...
June 24, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28644620/nanofibrous-smart-fabrics-from-twisted-yarns-of-electrospun-piezo-polymer
#16
Enlong Yang, Zhe Xu, Lucas Chur, Ali Behroozfar, Mahmoud Baniasadi, Salvador Moreno, Jiacheng Huang, Jules Gilligan, Majid Minary-Jolandan
Smart textiles are envisioned to make a paradigm shift in wearable technologies to directly impart functionality into the fibers rather than integrating sensors and electronics onto conformal substrates or skin in wearable devices. Among smart materials, piezoelectric fabrics have not been widely reported, yet. Piezoelectric smart fabrics can be used for mechanical energy harvesting, for thermal energy harvesting through the pyroelectric effect, for ferroelectric applications, as pressure and force sensors, for motion detection, and for ultrasonic sensing...
June 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28644506/reduced-graphene-oxide-coated-porous-carbon-sulfur-nanofiber-as-a-flexible-paper-electrode-for-lithium-sulfur-batteries
#17
R X Chu, J Lin, C Q Wu, J Zheng, Y L Chen, J Zhang, R H Han, Y Zhang, H Guo
Lithium-sulfur (Li-S) batteries have attracted great attention owing to their excellent electrochemical properties, such as the high discharge voltage of 2.3 V, specific capacity of 1675 mA h g(-1) and energy density of 2600 Wh kg(-1). The widely used slurry made electrodes of Li-S batteries are plagued by the serious shuttle effect and insulating nature of sulfur. Herein, a reduced graphene oxide coated porous carbon nanofiber flexible paper (rGO@S-PCNP) was fabricated and directly used as an additive-free cathode for Li-S batteries...
June 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28644494/feco-nanoparticles-embedded-carbon-nanofibers-as-robust-peroxidase-mimics-for-sensitive-colorimetric-detection-of-l-cysteine
#18
Zezhou Yang, Yun Zhu, Guangdi Nie, Meixuan Li, Ce Wang, Xiaofeng Lu
A simple and low cost detection of l-cysteine is essential in the fields of biosensors and medical diagnosis. In this study, we have developed a simple electrospinning, followed by calcination process to prepare FeCo nanoparticles embedded in carbon nanofibers (FeCo-CNFs) as an efficient peroxidase-like mimic for the detection of l-cysteine. FeCo nanoparticles are uniformly dispersed within CNFs, and their diameters are highly influenced by the calcination temperature. The calcination temperature also influences the peroxidase-like catalytic activity, and the maximum activity is achieved at a calcination temperature of 550 °C...
June 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28644013/a-simple-approach-to-prepare-carboxycellulose-nanofibers-from-untreated-biomass
#19
Priyanka R Sharma, Ritika Joshi, Benjamin S Hsiao
A simple approach was developed to prepare carboxycellulose nanofibers directly from untreated biomass using nitric acid or nitric acid-sodium nitrite mixtures. Experiments indicated that this approach greatly reduced the need for multi-chemicals, and offered significant benefits in lowering the consumption of water and electric energy, when compared with conventional multiple-step processes at bench scale (e.g. TEMPO oxidation). Additionally, the effluent produced by this approach could be efficaciously neutralized using base to produce nitrogen-rich salts as fertilizers...
June 23, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28643834/understanding-the-remarkable-luminescence-enhancement-via-sio2-coating-on-tio2-eu-3-nanofibers
#20
Meiqi Chang, Yanhua Song, Ye Sheng, Jie Chen, Haifeng Zou
TiO2:Eu(3+) nanofibers diameters can be tuned by changing the mixed solvent ratio are synthesized via the electrospinning technique. Concentration quenching phenomena and the relationship of the PL intensity ratio I((5)D0-(7)F2)/I((5)D0-(7)F1) with the Eu doping concentration are discussed. Notably, the luminescence intensity is enhanced by about 7.8 fold by coating SiO2 gel layer on the TiO2:Eu(3+) nanofibers, which is successfully performed via a sol-gel process followed by calcination. Furthermore, these fibers are characterized systematically via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence (PL) spectroscopy...
June 23, 2017: Physical Chemistry Chemical Physics: PCCP
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