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https://www.readbyqxmd.com/read/29168916/fabrication-characterization-and-biocompatibility-assessment-of-a-novel-elastomeric-nanofibrous-scaffold-a-potential-scaffold-for-soft-tissue-engineering
#1
Elham Shamirzaei Jeshvaghani, Laleh Ghasemi-Mobarakeh, Reza Mansurnezhad, Fatemeh Ajalloueian, Mahshid Kharaziha, Mohammad Dinari, Maryam Sami Jokandan, Ioannis S Chronakis
With regard to flexibility and strength properties requirements of soft biological tissue, elastomeric materials could be more beneficial in soft tissue engineering applications. The present work investigates the use of an elastic polymer, (polycaprolactone fumarate [PCLF]), for fabricating an electrospun scaffold. PCLF with number-average molecular weight of 13,284 g/mol was synthetized, electrospun PCLF:polycaprolactone (PCL) (70:30) nanofibrous scaffolds were fabricated and a novel strategy (in situ photo-crosslinking along with wet electrospinning) was applied for crosslinking of PCLF in the structure of PCLF:PCL nanofibers was presented...
November 23, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29168853/electrospun-flexible-poly-bisphenol-a-carbonate-nanofibers-decorated-with-ag-nanoparticles-as-effective-3d-sers-substrates-for-trace-tnt-detection
#2
Yi Li, Rui Lu, Jinyou Shen, Weiqing Han, Xiuyun Sun, Jiansheng Li, Lianjun Wang
A flexible 3D hybrid PC/Ag surface-enhanced Raman scattering (SERS) substrate was fabricated through the combination of electrospinning and in situ chemical reduction. Due to the rough surface morphology and the intricate 3D structure, a high density of Raman "hotspots" was formed at the junctions of cross-linked nanofibers, resulting in excellent sensitivity to a probe molecule (4-aminothiophenol). The nanofibers were modified with l-cysteine to capture TNT molecules by the formation of a Meisenheimer complex, after which positively charged 4-ATP-labelled AgNPs were introduced to the system, which both generated more hotspots and led to a linear relationship between the TNT concentration and the SERS intensity of the labelled molecules...
November 23, 2017: Analyst
https://www.readbyqxmd.com/read/29164775/high-throughput-phase-field-design-of-high-energy-density-polymer-nanocomposites
#3
Zhong-Hui Shen, Jian-Jun Wang, Yuanhua Lin, Ce-Wen Nan, Long-Qing Chen, Yang Shen
Understanding the dielectric breakdown behavior of polymer nanocomposites is crucial to the design of high-energy-density dielectric materials with reliable performances. It is however challenging to predict the breakdown behavior due to the complicated factors involved in this highly nonequilibrium process. In this work, a comprehensive phase-field model is developed to investigate the breakdown behavior of polymer nanocomposites under electrostatic stimuli. It is found that the breakdown strength and path significantly depend on the microstructure of the nanocomposite...
November 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29164455/removal-of-lead-from-aqueous-solution-using-polyacrylonitrile-magnetite-nanofibers
#4
Hammad Malik, Umair Ahmed Qureshi, Muhammad Muqeet, Rasool Bux Mahar, Farooq Ahmed, Zeeshan Khatri
Lead is known for its toxic and non-biodegradable behavior. The consumption of lead-contaminated water is one of the major threat the world is facing nowadays. In this study, polyacrylonitrile (PAN) and magnetite (Fe3O4) composite nanofiber adsorbent was developed for Pb(2+) removal in batch mode. The synthesis was done by a simple and scalable process of electrospinning followed by chemical precipitation of Fe3O4. The nanofibers thus obtained were characterized through FTIR, zeta potential analyzer, and scanning electron microscope (SEM) and were analyzed for their adsorption capability for Pb(2+) ions...
November 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29162855/three-dimensional-honeycomb-patterned-fibrinogen-based-nanofibers-induce-substantial-osteogenic-response-of-mesenchymal-stem-cells
#5
Salima Nedjari, Firas Awaja, George Altankov
Stem cells therapy offers a viable alternative for treatment of bone disorders to the conventional bone grafting. However clinical therapies are still hindered by the insufficient knowledge on the conditions that maximize stem cells differentiation. Hereby, we introduce a novel 3D honeycomb architecture scaffold that strongly support osteogenic differentiation of human adipose derived mesenchymal stem cells (ADMSCs). The scaffold is based on electrospun hybrid nanofibers consisting of poly (L-lactide ε-caprolactone) and fibrinogen (PLCL/FBG)...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29161020/deformation-drives-alignment-of-nanofibers-in-framework-for-inducing-anisotropic-cellulose-hydrogels-with-high-toughness
#6
Dongdong Ye, Qiaoyun Cheng, Qianlei Zhang, Yixiang Wang, Chunyu Chang, Liangbin Li, Haiyan Peng, Lina Zhang
Deformation driven alignment of molecules or nanofibers leading to anisotropy is a challenge in functional soft materials. Here, high toughness hydrogels with deformation-induced anisotropy are fabricated from cellulose solution in LiOH/urea, relying on successively designing a loose chemical crosslinking network and a dense physical network containing nanofibers and submicrobundles formed through parallel self-aggregation in dilute acid. The loose network acts as a large framework, whereas relatively dense physical networks are integrated inside, jointly constituting the hierarchical architecture...
November 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29159695/a-novel-lignin-based-nanofibrous-dressing-containing-arginine-for-wound-healing-applications
#7
Fatemeh Reesi, Mohsen Minaiyan, Azade Taheri
Nanofiber-based wound dressings have attracted much attention in wound care owing to their unique properties such as high aspect ratio and three-dimensional structure. Arginine is a precursor of nitric oxide that plays an important role in the wound-healing process. Therefore, in this study, we have developed a gel which contains lignin nanofibers (Lig-NFs) that were surface modified by arginine molecules via electrostatic interaction (Arg-Lig-NF gel). The effect of pH on the amount of arginine attached on Lig-NF surface was evaluated at three different pH values-5, 6, and 7...
November 20, 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/29155551/the-template-assisted-wet-combustion-synthesis-of-fibrous-nickel-based-catalyst-for-carbon-dioxide-methanation-and-methane-steam-reforming
#8
Marina Aghayan, Dmitriy Potemkin, Fernando Rubio-Marcos, Sergey Uskov, P Snytnikov, Irina Hussainova
Efficient capture and recycling of CO2 enable not only preventing global warming but also to supplying useful low-carbon fuels. The catalytic conversion of CO2 into organic compound is a promising recycling approach which opens new concepts and opportunities for catalytic and industrial development. Here we report about template-assisted wet-combustion synthesis of one-dimensional nickel-based catalyst for carbon dioxide methanation and methane steam reforming. Due to a high temperature achieved in a short time during reaction and a large amount of gases evolved, the wet-combustion synthesis yields homogeneously precipitated nanoparticles of NiO with average particle size of 4 nm on alumina nanofibers covered with NiAl2O4 nano-layer...
November 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29155154/poly-l-lactic-acid-nanofibers-containing-cissus-quadrangularis-induced-osteogenic-differentiation-in-vitro
#9
K Parvathi, Amit G Krishnan, A Anitha, R Jayakumar, Manitha B Nair
Cissus quadrangularis (CQ) is known as "bone setter" because of its ability to enhance fracture healing. Polymers incorporated with CQ at lower concentration have shown to enhance osteogenic differentiation of mesenchymal stem cells (MSCs) in vitro. However, for the healing of clinically relevant critical sized bone defects, large amount of CQ would be required. Based on this perception, a herbal fibrous sheet containing high weight percentage of CQ [20,40 and 60wt/wt% in poly (L-lactic acid) (PLLA)] was fabricated through electrospinning...
November 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29152562/fast-dissolving-dendrimer-nanofiber-mats-as-alternative-to-eye-drops-for-more-efficient-antiglaucoma-drug-delivery
#10
Michael G Lancina, Sudha Singh, Uday B Kompella, Shahid Husain, Hu Yang
Polyamidoamine (PAMAM) dendrimers have been investigated as a potential platform for a number of ocular drugs, but only in aqueous solution. In this work we have developed fast dissolving dendrimer-based nanofibers (DNF) as a topical delivery vehicle for the glaucoma drug brimonidine tartrate (BT). The safety and drug release kinetics of these nanofiber mats were evaluated in vitro and in vivo. DNF caused no toxicity at therapeutic levels in cultured cells or ocular irritation in animal tests using a normotensive rat model...
August 14, 2017: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/29150802/ion-imprinted-electrospun-nanofibers-of-chitosan-1-butyl-3-methylimidazolium-tetrafluoroborate-for-the-dynamic-expulsion-of-thorium-iv-ions-from-mimicked-effluents
#11
Prakash Macchindra Gore, Latika Khurana, Suhail Siddique, Anjana Panicker, Balasubramanian Kandasubramanian
The present study explores the innocuous, biocompatible, and extremely competent molecularly imprinted chitosan/RTIL electrospun nanofibers having average diameter of 30 nm for the expulsion of thorium (IV) ions from the mimicked effluent waste. The extended Flory-Huggins theory and three-dimensional molecular modeling have been effectively premeditated via Materials Studio software for enumerating the inter-miscibility and compatibility (Chi parameter (χ) = 1.019, mixing energy (Emix) = 0.603 kcal/mol) of the chitosan/RTIL (1-butyl-3-methylimidazolium tetrafluoroborate)...
November 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29150767/cell-migration-in-1d-and-2d-nanofiber-microenvironments
#12
Horacio M Estabridis, Aniket Jana, Amrinder Nain, David J Odde
Understanding how cells migrate in fibrous environments is important in wound healing, immune function, and cancer progression. A key question is how fiber orientation and network geometry influence cell movement. Here we describe a quantitative, modeling-based approach toward identifying the mechanisms by which cells migrate in fibrous geometries having well controlled orientation. Specifically, U251 glioblastoma cells were seeded onto non-electrospinning Spinneret based tunable engineering parameters fiber substrates that consist of networks of suspended 400 nm diameter nanofibers...
November 17, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29149529/scalable-fabrication-of-highly-active-and-durable-membrane-electrodes-toward-water-oxidation
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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