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https://www.readbyqxmd.com/read/29149529/scalable-fabrication-of-highly-active-and-durable-membrane-electrodes-toward-water-oxidation
#1
Yu Li, Shuangming Chen, Dawei Xi, Yanan Bo, Ran Long, Chengming Wang, Li Song, Yujie Xiong
The electrocatalytic oxygen evolution reaction (OER) is a highly important reaction that requires a relatively high overpotential and determines the rate of water splitting-a process for producing hydrogen. The overall OER performance is often largely limited by uncontrollable interface when active catalysts are loaded on conductive supports, for which polymer binders are widely used, but inevitably block species transportation channels. Here, a scalable fabrication approach to freestanding graphitized carbon nanofiber networks is reported, which provides abundant sites for in situ growing Fe/Ni catalysts with the improved interface...
November 17, 2017: Small
https://www.readbyqxmd.com/read/29149049/preparation-of-solution-blown-polyamic-acid-nanofibers-and-their-imidization-into-polyimide-nanofiber-mats
#2
Jing Li, Guocheng Song, Junrong Yu, Yan Wang, Jing Zhu, Zuming Hu
Solution blow spinning (SBS) is an innovative process for spinning micro/nanofibers. In this paper, polyamic acid (PAA) nanofibers were fabricated via a SBS apparatus and then imidized into polyimide (PI) nanofibers via thermal process. The morphology and diameter distributions of PAA nanofibers were determined by scanning electron microscope (SEM) and Image Tool software, the processing parameters, including PAA concentration, solution feeding rate, gas pressure, nozzle size, and receiving distance were investigated in details...
November 17, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29148700/selective-ph-responsive-core-sheath-nanofiber-membranes-for-chem-bio-med-applications-targeted-delivery-of-functional-molecules
#3
Daewoo Han, Andrew J Steckl
Core-sheath fibers using different Eudragit materials were successfully produced and their controlled multi-pH responses have been demonstrated. Coaxial fibers made of Eudragit L 100 (EL100) core and Eudragit S 100 (ES100) sheath provide protection and/or controlled release of core material at pH 6 by adjusting the sheath thickness (controlled by the flow rate of source polymer solution). Thickest sheath (~ 250 nm) provides the least core release ~ 1.25 %/hr, while the thinnest sheath (~ 140 nm) provides much quicker release ~ 16...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29144730/cancer-protrusions-on-a-tightrope-nanofiber-curvature-contrast-quantitates-single-protrusion-dynamics
#4
Brian Koons, Puja Sharma, Zhou Ye, Apratim Mukherjee, Meng Horng Lee, Denis Wirtz, Bahareh Behkam, Amrinder Singh Nain
Cell migration is studied with the traditional focus on protrusion driven cell body displacement, while less is known on morphodynamics of individual protrusions themselves, especially in fibrous environments mimicking extracellular matrix. Here, using suspended fibers, we report integrative and multiscale abilities to study protrusive behavior independent of cell body migration. By manipulating the diameter of fibers in orthogonal directions, we constrain cell migration along large diameter (2 µm) base fibers, while solely allowing cells to sense, initiate, and mature protrusions on orthogonally deposited high curvature-low diameter (~100, 200 and 600 nm) protrusive fibers and low-curvature (~300 and 600 nm width) protrusive flat ribbons...
November 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/29139298/sic-nanofiber-mat-a-broadband-microwave-absorber-and-the-alignment-effect
#5
Yi Hou, Laifei Cheng, Yani Zhang, Yong Yang, Chaoran Deng, Zhihong Yang, Qi Chen, Xiaoqing Du, Lianxi Zheng
Fiber alignment is a key factor that determines the physical properties of nanofiber mats. In this work, SiC nanofiber mats with or without fiber alignment are fabricated via electrospinning and the microwave electromagnetic (EM) properties of their silicone resin composites (5wt.%) are investigated in 2-18 GHz. By comparing with the composite containing smashed nanofiber, it is found that the nanofiber mats show superior dielectric loss and a minimal reflection loss (RL) of around -49 dB at 8.6 GHz and 4.3 mm thickness, associated with a broad effective absorption (<-10 dB) bandwidth (EAB) of about 7...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29136889/carbon-nanostructured-films-modified-by-metal-nanoparticles-supported-on-filtering-membranes-for-electroanalysis
#6
Erica Paramo, Susana Palmero, Aranzazu Heras, Alvaro Colina
A novel methodology to prepare sensors based on carbon nanostructures electrodes modified by metal nanoparticles is proposed. As a proof of concept, a novel bismuth nanoparticle/carbon nanofiber (Bi-NPs/CNF) electrode and a carbon nanotube (CNT)/gold nanoparticle (Au-NPs) have been developed. Bi-NPs/CNF films were prepared by 1) filtering a dispersion of CNFs on a polytetrafluorethylene (PTFE) filter, and 2) filtering a dispersion of Bi-NPs chemically synthesized through this CNF/PTFE film. Next the electrode is prepared by sticking the Bi-NPs/CNF/PTFE film on a PET substrate...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136804/an-on-line-coupling-of-nanofibrous-extraction-with-column-switching-high-performance-liquid-chromatography-a-case-study-on-the-determination-of-bisphenol-a-in-environmental-water-samples
#7
Martina Háková, Lucie Chocholoušová Havlíková, Jiří Chvojka, Petr Solich, Dalibor Šatínský
Polyamide 6 nanofiber polymers were used as modern sorbents for on-line solid phase extraction (SPE) coupled with liquid chromatography. The on-line SPE system was tested for the determination of bisphenol A in river water samples. Polyamide nanofibers were prepared using needleless electrospinning, inserted into a mini-column cartridge (5 × 4.6mm) and coupled with HPLC. The effect of column packing and the amount of polyamide 6 on extraction efficiency was tested and the packing process was optimized. The proposed method was performed using a 50-µL sample injection followed by an on-line nanofibrous extraction procedure...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29134783/electrospun-titania-fiber-mats-spin-coated-with-thin-polymer-films-as-nanofibrous-scaffolds-for-enhanced-cell-proliferation
#8
Alfin Kurniawan, Chintya Effendi, Meng-Jiy Wang
The incorporation of inorganic materials into electrospun nanofibers has recently gained considerable attention for the development of ECM-like scaffolds with improved mechanical properties and enhanced biological functions for tissue engineering applications. In this study, polymer-inorganic composite fibers consisting of poly(2-ethyl-2-oxazoline) (PEOXA) and tetrabutyl titanate (TBT) as the titanium precursor were successfully fabricated through a combined sol-gel/electrospinning approach. PEOXA/Ti(OR)n composite fibers were obtained with varying amounts of polymer and titanium precursors...
November 14, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29134692/water-rich-biomimetic-composites-with-abiotic-self-organizing-nanofiber-network
#9
Lizhi Xu, Xueli Zhao, Chuanlai Xu, Nicholas A Kotov
Load-bearing soft tissues, e.g., cartilage, ligaments, and blood vessels, are made predominantly from water (65-90%) which is essential for nutrient transport to cells. Yet, they display amazing stiffness, toughness, strength, and deformability attributed to the reconfigurable 3D network from stiff collagen nanofibers and flexible proteoglycans. Existing hydrogels and composites partially achieve some of the mechanical properties of natural soft tissues, but at the expense of water content. Concurrently, water-rich biomedical polymers are elastic but weak...
November 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29133199/isolation-and-characterization-of-a-novel-tyrosinase-produced-by-sahara-soil-actinobacteria-and-immobilization-on-nylon-nanofiber-membranes
#10
Mohammed Harir, Bellahcene Miloud, Maria Camilla Baratto, Simona Pollini, Gian Maria Rossolini, Lorenza Trabalzini, Enrico Fatarella, Rebecca Pogni
In the present study different actinomycete strains were collected and isolated from algerian Sahara soil with the aim to select novel enzymes with promising features for biotechnological applications. The Ms1 strain was selected, amongst the others, for its capability to produce melanin in different solid media. Ms1 chromosomal DNA was sequenced and the strain assigned to Streptomyces cyaneofuscatus sp. A tyrosinase (MW∼30kD) encoding sequence was identified and the corresponding enzyme was isolated and biochemically characterized...
November 10, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/29131636/template-guided-assembly-of-silk-fibroin-on-cellulose-nanofibers-for-robust-nanostructures-with-ultrafast-water-transport
#11
Rui Xiong, Ho Shin Kim, Shuaidi Zhang, Sunghan Kim, Volodymyr F Korolovych, Ruilong Ma, Yaroslava G Yingling, Canhui Lu, Vladimir V Tsukruk
The construction of multilength scaled hierarchical nanostructures from diverse natural components is critical in the progress toward all-natural nanocomposites with structural robustness and versatile added functionalities. Here, we report a spontaneous formation of peculiar "shish kebab" nanostructures with the periodic arrangement of silk fibroin domains along straight segments of cellulose nanofibers. We suggest that the formation of these shish kebab nanostructures is facilitated by the preferential organization of heterogeneous (β-sheets and amorphous silk) domains along the cellulose nanofiber driven by modulated axial distribution of crystalline planes, hydrogen bonding, and hydrophobic interactions as suggested by all-atom molecular dynamic simulations...
November 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/29131232/homogenous-graphene-oxide-peptide-nanofiber-hybrid-hydrogel-as-biomimetic-polysaccharide-hydrolase
#12
Xingxing He, Fuyuan Zhang, Jifeng Liu, Guozhen Fang, Shuo Wang
Cellulose, an impressive potential sustainable fuel, is difficult to hydrolyze because of the protection of β-1,4-glycosidic bonds through the tight hydrogen bonding network. In this study, homogenous graphene oxide (GO)-peptide nanofiber hybrid hydrogels (GO-PNFs) were designed as a β-glycosyl hydrolase mimetic to achieve efficient degradation of cellobiose and cellopentaose. For comparison, free peptides, graphene oxide mixed with free peptides (GO-peptdies) and self-assembled peptide nanofibers (PNFs) were also studied for their activity as a hydrolase mimetics for degradation of cellobiose...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29130836/composite-3d-printed-scaffold-with-structured-electrospun-nanofibers-promotes-chondrocyte-adhesion-and-infiltration
#13
M Rampichová, E Košt'áková Kuželová, E Filová, J Chvojka, J Šafka, M Pelcl, J Daňková, E Prosecká, M Buzgo, M Plencner, D Lukáš, E Amler
Additive manufacturing, also called 3D printing, is an effective method for preparing scaffolds with defined structure and porosity. The disadvantage of the technique is the excessive smoothness of the printed fibers, which does not support cell adhesion. In the present study, a 3D printed scaffold was combined with electrospun classic or structured nanofibers to promote cell adhesion. Structured nanofibers were used to improve the infiltration of cells into the scaffold. Electrospun layers were connected to 3D printed fibers by gluing, thus enabling the fabrication of scaffolds with unlimited thickness...
November 13, 2017: Cell Adhesion & Migration
https://www.readbyqxmd.com/read/29130311/decoding-apparent-ferroelectricity-in-perovskite-nanofibers
#14
Rajasekaran Ganeshkumar, Suhas Somnath, Chin Wei Cheah, Stephen Jesse, Sergei V Kalinin, Rong Zhao
Ferroelectric perovskites are an important group of materials underpinning a wide variety of devices ranging from sensors and transducers to non-volatile memories and photovoltaic cells. Despite the progress in material synthesis, ferroelectric characterization of nanoscale perovskites is still a challenge. Piezoresponse force microscopy (PFM) is one of the most popular tools for probing and manipulating nanostructures to study the ferroelectric properties. However, the interpretation of hysteresis data and alternate signal origins are critical...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29130091/donor-acceptor-interaction-driven-self-assembly-of-amphiphilic-rod-coil-molecules-into-supramolecular-nanoassemblies
#15
Shengsheng Yu, Yuntian Yang, Tie Chen, Jingzhe Xu, Long Yi Jin
Rigid-flexible amphiphilic molecules consisting of an aromatic segment based on pyrene and biphenyl units and hydrophilic polyethylene oxide chains self-assemble into lamellar, hexagonal columnar, and two-dimensional columnar nanostructures in the bulk state. In aqueous solution, these molecules self-assemble into nanofibers, spherical micelles, and multilayer nanotubes, depending on the chain or rod length of the molecules. Notably, ordered nanostructures of supramolecular polymers, such as single-layer curving fragments, nanofibers, and nanosheets, were constructed through charge-transfer interactions between the nanoobjects and an electron-acceptor molecule, 2,4,5,7-tetranitrofluorenone...
November 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/29128721/preparation-of-mgal-edta-ldh-based-electrospun-nanofiber-membrane-and-its-adsorption-properties-of-copper-ii-from-wastewater
#16
Hong Chen, Jianhui Lin, Ning Zhang, Liangzhe Chen, Shuiping Zhong, Yao Wang, Wengong Zhang, Qidan Ling
Adsorption is recognized as one of the most promising technologies applied to remove heavy metals from contaminated water. However, the adsorption efficiency often decreases because of the aggregation and loss of adsorbents. Herein, a novel adsorbent was synthesized by intercalation ethylenediaminetetraacetic acid (EDTA) into layered double hydroxides (LDH) and subsequent encapsulated into PAN polymer matrix using electrospinning. The synthesized electrospun nanofiber membrane (MgAl-EDTA-LDH@PAN) was found to combine the advantages of LDH@PAN nanofiber membrane (high surface area, easy to separate, free from aggregation and loss) and EDTA (powerful chelating agent)...
November 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29128535/branched-peptides-integrate-into-self-assembled-nanostructures-and-enhance-biomechanics-of-peptidic-hydrogels
#17
Raffaele Pugliese, Federico Fontana, Amanda Marchini, Fabrizio Gelain
Self-assembling peptides (SAP) have drawn an increasing interest in the tissue engineering community. They display unquestionable biomimetic properties, tailorability and promising biocompatibility. However their use has been hampered by poor mechanical properties making them fragile soft scaffolds. To increase SAP hydrogel stiffness we introduced a novel strategy based on multiple ramifications of (LDLK)3, a well-known linear SAP, connected with one or multiple "lysine knots". Differently branched SAPs were tested by increasing the number of (LDLK)3-like branches and by adding the neuro-regenerative functional motif BMHP1 as a single branch...
November 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29125471/carbon-dots-polyvinylpyrrolidone-hybrid-nanofibers-with-efficient-solid-state-photoluminescence-constructed-by-electrospinning-technique
#18
Yue Zhai, Xue Bai, Haining Cui, Jinyang Zhu, Wei Liu, Tianxiang Zhang, Biao Dong, Gencai Pan, Lin Xu, Shuang Zhang, Hongwei Song
Carbon dots (CDs) are the promising candidates for the application in the optoelectronic and biological areas due to their excellent photo-stability, unique photoluminescence, good biocompatibility, low toxicity and chemical inertness. However, the self-quenching of photoluminescence as they are dried into the solid-state dramatically limits their further applications. Therefore, realizing the efficient photoluminescence and large-scale production of CDs in the solid state is an urgent challenge. Herein, the solid-state hybrid nanofibers based on CDs and polyvinylpyrrolidone (PVP) are constructed through electrospinning process...
November 10, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29125136/mechanically-stable-surface-hydrophobilized-chitosan-nanofibrous-barrier-membranes-for-guided-bone-regeneration
#19
Chaoxi Wu, Hengjie Su, Anastasios Karydis, Kenneth M Anderson, Najib Ghadri, Shunqing Tang, Yifei Wang, Joel D Bumgardner
The use of chitosan based nanofiber membranes in guided bone regeneration (GBR) is limited by its uncontrolled swelling and mechanical instability in aqueous environments. This paper describes the significantly improved stability and properties of surface butyrylated chitosan nanofiber (BCSNF) membranes that greatly enhance their potential in GBR. The BCSNF membranes exhibited an overall degree of substitution of 1.61, an average diameter of 99.3 ± 33.7 nm, and a 75% decrease in swelling with an approximate doubling in suture pull out strengths as compared to unmodified fibers in aqueous environment...
November 10, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29123183/flexible-fe3o4-carbon-nanofibers-hierarchically-assembled-with-mno2-particles-for-high-performance-supercapacitor-electrodes
#20
Nousheen Iqbal, Xianfeng Wang, Aijaz Ahmed Babar, Ghazala Zainab, Jianyong Yu, Bin Ding
Increasing use of wearable electronic devices have resulted in enhanced demand for highly flexible supercapacitor electrodes with superior electrochemical performance. In this study, flexible composite membranes with electrosprayed MnO2 particles uniformly anchored on Fe3O4 doped electrospun carbon nanofibers (Fe3O4@CNFMn) have been prepared as flexible electrodes for high-performance supercapacitors. The interconnected porous beaded structure ensures free movement of electrolyte within the composite membranes, therefore, the developed supercapacitor electrodes not only offer high specific capacitance of ~306 F/g, but also exhibit good capacitance retention of ~85% after 2000 cycles, which certify that the synthesized electrodes offer high and stable electrochemical performance...
November 9, 2017: Scientific Reports
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