keyword
MENU ▼
Read by QxMD icon Read
search

Nanofiber

keyword
https://www.readbyqxmd.com/read/27910815/in-vitro-and-in-vivo-evaluations-of-a-novel-post-electrospinning-treatment-to-improve-the-fibrous-structure-of-chitosan-membranes-for-guided-bone-regeneration
#1
Hengjie Su, Kwei-Yu Liu, Anastasios Karydis, Daniel G Abebe, Chaoxi Wu, Kenneth M Anderson, Najib Ghadri, Pradeep Adatrow, Tomoko Fujiwara, Joel D Bumgardner
Electrospun chitosan membranes have been investigated for guided bone regeneration but are susceptible to swelling, dissolution, and loss of biomimetic nanofiber structure due to residual acid salts. A novel process was investigated for acidic salt removal from chitosan electrospun in 70% trifluoroacetic acid (TFA) by treating with triethylamine (TEA)/acetone and di-tert-butyl dicarbonate (tBOC) instead of the common Na2CO3 treatment. TFA salt removal and nanofiber structure stabilization were confirmed by EDS, FTIR, (19)F NMR and electron microscopy before and after soaking in water...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27909870/erratum-to-evaluation-of-the-effect-of-nt-3-and-biodegradable-poly-l-lactic-acid-nanofiber-scaffolds-on-differentiation-of-rat-hair-follicle-stem-cells-into-neural-cells-in-vitro
#2
Fatemeh Moghani Ghoroghi, Leila Beygom Hejazian, Banafshe Esmaeilzade, Masumeh Dodel, Masoud Roudbari, Maliheh Nobakht
No abstract text is available yet for this article.
December 1, 2016: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/27908759/cathepsin-nanofiber-substrates-as-potential-agent-for-targeted-drug-delivery
#3
Yael Ben-Nun, Galit Fichman, Lihi Adler-Abramovich, Boris Turk, Ehud Gazit, Galia Blum
The development of reactive drug carriers that could actively respond to biological signals is a challenging task. Different peptides can self-assemble into biocompatible nanostructures of various functionalities, including drugs carriers. Minimal building blocks, such as diphenylalanine, readily form ordered nanostructures. Here we present development of self-assembled tetra-peptides that include the diphenylalanine motif, serving as substrates of the cathepsin proteases. This is of great clinical importance as cathepsins, whose activity and expression are highly elevated in cancer and other pathologies, have been shown to serve as efficient enzymes for therapeutic release...
November 28, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/27907145/training-to-improve-precision-and-accuracy-in-the-measurement-of-fiber-morphology
#4
Nathan A Hotaling, Jun Jeon, Mary Beth Wade, Derek Luong, Xavier-Lewis Palmer, Kapil Bharti, Carl G Simon
An estimated $7.1 billion dollars a year is spent due to irreproducibility in pre-clinical data from errors in data analysis and reporting. Therefore, developing tools to improve measurement comparability is paramount. Recently, an open source tool, DiameterJ, has been deployed for the automated analysis of scanning electron micrographs of fibrous scaffolds designed for tissue engineering applications. DiameterJ performs hundreds to thousands of scaffold fiber diameter measurements from a single micrograph within a few seconds, along with a variety of other scaffold morphological features, which enables a more rigorous and thorough assessment of scaffold properties...
2016: PloS One
https://www.readbyqxmd.com/read/27906586/neural-differentiation-of-mesenchymal-stem-cells-on-scaffolds-for-nerve-tissue-engineering-applications
#5
Kerlin Quintiliano, Thayane Crestani, Davi Silveira, Virginia Etges Helfer, Annelise Rosa, Eduardo Balbueno, Daniela Steffens, Geraldo Pereira Jotz, Diogo André Pilger, Patricia Pranke
Scaffolds produced by electrospinning act as supports for cell proliferation and differentiation, improved through the release of neurotrophic factors. The objective of this study was to develop aligned and random nanofiber scaffolds with and without nerve growth factor to evaluate the potential of mesenchymal stem cells (MSCs) for neural differentiation. Nanofiber morphology, diameter, degradability, cell morphology, adhesion, proliferation, viability, cytotoxicity, and neural differentiation were performed to characterize the scaffolds...
November 2016: Cellular Reprogramming
https://www.readbyqxmd.com/read/27905472/electrochemical-communication-with-the-inside-of-cells-using-micro-patterned-vertical-carbon-nanofibre-electrodes
#6
F J Rawson, M T Cole, J M Hicks, J W Aylott, W I Milne, C M Collins, S K Jackson, N J Silman, P M Mendes
With the rapidly increasing demands for ultrasensitive biodetection, the design and applications of new nano-scale materials for development of sensors based on optical and electrochemical transducers have attracted substantial interest. In particular, given the comparable sizes of nanomaterials and biomolecules, there exist plenty of opportunities to develop functional nanoprobes with biomolecules for highly sensitive and selective biosensing, shedding new light on cellular behaviour. Towards this aim, herein we interface cells with patterned nano-arrays of carbon nanofibers forming a nanosensor-cell construct...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27905320/nanoporous-nanocomposite-membranes-via-hybrid-twin-screw-extrusion-multijet-electrospinning
#7
Semra Senturk-Ozer, Seda Aktas, Jing He, Frank T Fisher, Dilhan M Kalyon
Non-woven nanoporous membranes of poly(caprolactone), PCL, incorporated with multi-walled carbon nanotubes, CNTs, could be fabricated via an industrially-scalable hybrid twin screw extrusion and electrospinning process. The utilization of a spinneret with multiple nozzles allowed the increase of the flow rate beyond what is possible with conventional electrospinning using a single nozzle, albeit at the expense of difficulties in the control of the thickness distributions of the nanofibrous membranes. The thickness and orientation distributions and the resulting mechanical properties of the membranes could be modified via changes in voltage, angular velocity of the collector mandrel and separation distance of the collector from the spinneret...
December 1, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27904497/preparation-of-polypyrrole-embedded-electrospun-poly-lactic-acid-nanofibrous-scaffolds-for-nerve-tissue-engineering
#8
Jun-Feng Zhou, Yi-Guo Wang, Liang Cheng, Zhao Wu, Xiao-Dan Sun, Jiang Peng
Polypyrrole (PPy) is a biocompatible polymer with good conductivity. Studies combining PPy with electrospinning have been reported; however, the associated decrease in PPy conductivity has not yet been resolved. We embedded PPy into poly(lactic acid) (PLA) nanofibers via electrospinning and fabricated a PLA/PPy nanofibrous scaffold containing 15% PPy with sustained conductivity and aligned topography. There was good biocompatibility between the scaffold and human umbilical cord mesenchymal stem cells as well as Schwann cells...
October 2016: Neural Regeneration Research
https://www.readbyqxmd.com/read/27901141/assembly-of-1d-nanofibers-into-a-2d-bi-layered-composite-nanofibrous-film-with-different-functionalities-at-the-two-layers-via-layer-by-layer-electrospinning
#9
Zijiao Wang, Qianli Ma, Xiangting Dong, Dan Li, Xue Xi, Wensheng Yu, Jinxian Wang, Guixia Liu
A two-dimensional (2D) bi-layered composite nanofibrous film assembled by one-dimensional (1D) nanofibers with trifunctionality of electrical conduction, magnetism and photoluminescence has been successfully fabricated by layer-by-layer electrospinning. The composite film consists of a polyaniline (PANI)/Fe3O4 nanoparticle (NP)/polyacrylonitrile (PAN) tuned electrical-magnetic bifunctional layer on one side and a Tb(TTA)3(TPPO)2/polyvinylpyrrolidone (PVP) photoluminescent layer on the other side, and the two layers are tightly combined face-to-face together into the novel bi-layered composite film of trifunctionality...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27900618/3d-carbon-nanofiber-microelectrode-arrays-fabricated-by-plasma-assisted-pyrolysis-to-enhance-sensitivity-and-stability-of-real-time-dopamine-detection
#10
Wenwen Yi, Yuanyuan Yang, Parastoo Hashemi, Mark Ming-Cheng Cheng
In this paper, we have fabricated 3D carbon nanofiber microelectrode arrays (MEAs) with highly reproducible and rich chemical surface areas for fast scan cyclic voltammetry (FSCV). Carbon nanofibers are created from negative photoresist by a new process called dual O2 plasma-assisted pyrolysis. The proposed approach significantly improves film adhesion and increases surface reactivity. We showcase our sensor's compatibility with FSCV analysis by demonstrating highly sensitive and stable FSCV dopamine measurements on a prototype 4-channel array...
December 2016: Biomedical Microdevices
https://www.readbyqxmd.com/read/27886552/three-dimensional-electrospun-pcl-pla-blend-nanofibrous-scaffolds-with-significantly-improved-stem-cells-osteogenic-differentiation-and-cranial-bone-formation
#11
Qingqing Yao, Jaqueline G L Cosme, Tao Xu, Jacob M Miszuk, Paulo H S Picciani, Hao Fong, Hongli Sun
Nanofibrous scaffolds that are morphologically/structurally similar to natural ECM are highly interested for tissue engineering; however, the electrospinning technique has the difficulty in directly producing clinically relevant 3D nanofibrous scaffolds with desired structural properties. To address this challenge, we have developed an innovative technique of thermally induced nanofiber self-agglomeration (TISA) recently. The aim of this work was to prepare (via the TISA technique) and evaluate 3D electrospun PCL/PLA blend (mass ratio: 4/1) nanofibrous scaffolds having high porosity of ∼95...
November 15, 2016: Biomaterials
https://www.readbyqxmd.com/read/27886233/apparent-power-law-scaling-of-variable-range-hopping-conduction-in-carbonized-polymer-nanofibers
#12
Kyung Ho Kim, Samuel Lara-Avila, Hojin Kang, Hans He, Johnas Eklӧf, Sung Ju Hong, Min Park, Kasper Moth-Poulsen, Satoshi Matsushita, Kazuo Akagi, Sergey Kubatkin, Yung Woo Park
We induce dramatic changes in the structure of conducting polymer nanofibers by carbonization at 800 °C and compare charge transport properties between carbonized and pristine nanofibers. Despite the profound structural differences, both types of systems display power law dependence of current with voltage and temperature, and all measurements can be scaled into a single universal curve. We analyze our experimental data in the framework of variable range hopping and argue that this mechanism can explain transport properties of pristine polymer nanofibers as well...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27885831/a-bioinspired-ultraporous-nanofiber-hydrogel-mimic-of-the-cartilage-extracellular-matrix
#13
Florian A Formica, Ece Öztürk, Samuel C Hess, Wendelin J Stark, Katharina Maniura-Weber, Markus Rottmar, Marcy Zenobi-Wong
A true biomimetic of the cartilage extracellular matrix (ECM) could greatly contribute to our ability to regenerate this tissue in a mechanically demanding, often inflamed environment. Articular cartilage is a composite tissue made of cells and fibrillar proteins embedded in a hydrophilic polymeric meshwork. Here, a polyanionic functionalized alginate is used to mimic the glycosaminoglycan component of the native ECM. To create the fibrillar component, cryoelectrospinning of poly(ε-caprolactone) on a -78 °C mandrel, subsequently treated by O2 plasma, is used to create a stable, ultraporous and hydrophillic nanofiber network...
November 25, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27883154/the-effect-of-the-nanofibrous-al2o3-aspect-ratio-on-fischer-tropsch-synthesis-over-cobalt-catalysts
#14
Chengchao Liu, Yuhua Zhang, Yanxi Zhao, Liang Wei, Jingping Hong, Li Wang, Sufang Chen, Guanghui Wang, Jinlin Li
A series of nanofibrous alumina materials with diameters of 4-6 nm and with different aspect ratios ranging from 3 to 16 were prepared. Cobalt impregnated catalysts were prepared by means of incipient wetness impregnation on alumina nanofibers while the 'rearranged' catalysts were prepared by using ultrasonication assistance to mix the fibers with the Co3O4 nanoparticles. The effects of the alumina nanofiber aspect ratios on the Co catalyst structure and performance for Fischer-Tropsch synthesis were studied...
November 24, 2016: Nanoscale
https://www.readbyqxmd.com/read/27882683/persistent-hydrogen-production-by-the-photo-assisted-microbial-electrolysis-cell-using-a-p-type-polyaniline-nanofiber-cathode
#15
Yongwon Jeon, Sunghyun Kim
A microbial electrolysis cell, though considered as a promising, environmentally friendly technology for hydrogen production, suffers from concomitant production of methane. The high hydrogen/methane ratio at the initial operation stage decreases with time. Here we report for the first time the photoassisted microbial electrolysis cell (MEC) for persistent hydrogen production using polyaniline nanofibers as a cathode. Under 0.8 V external bias and laboratory fluorescent light illumination in a single-chamber MEC, continuous hydrogen production from acetate at a rate of 1...
November 24, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27880892/electrospinning-versus-microfluidic-spinning-of-functional-fibers-for-biomedical-applications
#16
REVIEW
Jie Cheng, Yesl Jun, Jianhua Qin, Sang-Hoon Lee
Micro- or nanofiber-based materials have extensive applications in biomedical fields due to their capability to mimic many aspects of physiological microenvironment in vivo. Fabricating micro- or nanofibers using biocompatible and biodegradable materials is becoming of great interest in the area of biomaterials and tissue engineering. Among the various technologies, electrospinning and microfluidic spinning are the two promising approaches to produce fibers at micro- and nano-scale. Choosing an appropriate spinning method is critical important for a specific application...
January 2017: Biomaterials
https://www.readbyqxmd.com/read/27878148/photo-chemo-dual-controlled-reversible-morphological-conversion-and-chiral-modulation-of-supramolecular-nanohelixes-with-nanosquares-and-nanofibers
#17
Wen Zhang, Yong Chen, Jie Yu, Xu-Jie Zhang, Yu Liu
A photo/chemo dually interconvertible system was constructed through the supramolecular assembly of azobenzene-diphenylalanine (Azo-FF) with α-cyclodextrin. The resultant chiral nanohelix was able to interconvert into a nanosquare upon irradiation at different wavelengths, but into a nanofiber upon changing solvent polarity, which provides a feasible way to achieve highly ordered nanostructures with various morphologies, dimensions and chiralities.
November 23, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27877870/luminescence-of-delafossite-type-cualo2-fibers-with-eu-substitution-for-al-cations
#18
Yin Liu, Yuxuan Gong, Nathan P Mellott, Bu Wang, Haitao Ye, Yiquan Wu
CuAlO2 has been examined as a potential luminescent material by substituting Eu for Al cations in the delafossite structure. CuAlO2:Eu(3+) nanofibers have been prepared via electrospinning for the ease of mitigating synthesis requirements and for future optoelectronics and emerging applications. Single-phase CuAlO2 fibers could be obtained at a temperature of 1100 °C in air. The Eu was successfully doped in the delafossite structure and two strong emission bands at ~405 and 610 nm were observed in the photoluminescence spectra...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27876892/handspinning-enabled-highly-concentrated-carbon-nanotubes-with-controlled-orientation-in-nanofibers
#19
Hoik Lee, Kei Watanabe, Myungwoong Kim, Mayakrishnan Gopiraman, Kyung-Hun Song, Jung Soon Lee, Ick Soo Kim
The novel method, handspinning (HS), was invented by mimicking commonly observed methods in our daily lives. The use of HS allows us to fabricate carbon nanotube-reinforced nanofibers (CNT-reinforced nanofibers) by addressing three significant challenges: (i) the difficulty of forming nanofibers at high concentrations of CNTs, (ii) aggregation of the CNTs, and (iii) control of the orientation of the CNTs. The handspun nanofibers showed better physical properties than fibers fabricated by conventional methods, such as electrospinning...
November 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27875975/self-assembly-of-dna-based-nanomaterials-and-potential-application-in-drug-delivery
#20
Zhiyong Zhao, Feng Liang, Simin Liu
DNA molecules can be self-assembled into programmable two-dimensional and three-dimensional nanostructures with arbitrarily predetermined sizes and shapes. Because of the addressable arbitrary size and shape, high capacity of cargo loading, ability to be internalized by cells, structural stability in physiological conditions and excellent biocompatibility, the pristine DNA nanostructures are explored as drug vehicles in drug delivery. In addition, DNA block copolymer and DNA-Dendron hybrid, as new building blocks, can be self-assembled into various ordered structures in aqueous solution, e...
November 22, 2016: Current Topics in Medicinal Chemistry
keyword
keyword
89466
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"