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https://www.readbyqxmd.com/read/28718615/development-of-nanofiber-sponges-containing-nerve-guidance-conduit-for-peripheral-nerve-regeneration-in-vivo
#1
Binbin Sun, Zi-Fei Zhou, Tong Wu, Weiming Chen, Dawei Li, Hao Zheng, Hany El-Hamshary, Salem S Al-Deyab, Xiumei Mo, Yinxian Yu
In the study of hollow nerve guidance conduit (NGC), the dispersion of regenerated axons always confused the researchers. To address this problem, filler-containing NGC was prepared, which showed better effect in the application of nerve tissue engineering. In this study, nanofiber sponges with abundant macro-pores, high porosity, and superior compressive strength were fabricated by electrospinning and freeze-drying. Poly (l-lactic acid-co-ε-caprolactone)/silk fibroin (PLCL/SF) nanofiber sponges were used as filler to prepare three-dimensional nanofiber sponges-containing (NS-containing) NGC...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28715369/electrospinning-of-photocatalytic-electrodes-for-dye-sensitized-solar-cells
#2
Nicolò Canever, Fraser Hughson, Thomas J Macdonald, Thomas Nann
This work demonstrates a protocol to fabricate a fiber-based photoanode for dye-sensitized solar cells, consisting of a light-scattering layer made of electrospun titanium dioxide nanofibers (TiO2-NFs) on top of a blocking layer made of commercially available titanium dioxide nanoparticles (TiO2-NPs). This is achieved by first electrospinning a solution of titanium (IV) butoxide, polyvinylpyrrolidone (PVP), and glacial acetic acid in ethanol to obtain composite PVP/TiO2 nanofibers. These are then calcined at 500 °C to remove the PVP and to obtain pure anatase-phase titania nanofibers...
June 28, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28714574/a-humanised-tissue-engineered-bone-model-allows-species-specific-breast-cancer-related-bone-metastasis-in-vivo
#3
V M C Quent, A V Taubenberger, J C Reichert, L C Martine, J A Clements, D W Hutmacher, D Loessner
Bone metastases frequently occur in the advanced stages of breast cancer. At this stage, the disease is deemed incurable. To date, the mechanisms of breast cancer-related metastasis to bone are poorly understood. This may be attributed to the lack of appropriate animal models to investigate the complex cancer cell-bone interactions. In this study, two established tissue-engineered bone constructs (TEBCs) were applied to a breast cancer-related metastasis model. A cylindrical medical-grade polycaprolactone-tricalcium phosphate scaffold produced by fused deposition modelling (scaffold 1) was compared with a tubular calcium phosphate-coated polycaprolactone scaffold fabricated by solution electrospinning (scaffold 2) for their potential to generate ectopic humanised bone in NOD/SCID mice...
July 17, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28714058/in-vitro-and-in-vivo-effects-of-pdgf-bb-delivery-strategies-on-tendon-healing-a-review
#4
O Evrova, J Buschmann
To promote and support tendon healing, one viable strategy is the use or administration of growth factors at the wound/rupture site. Platelet derived growth factor-BB (PDGF-BB), together with other growth factors, is secreted by platelets after injury. PDGF-BB promotes mitogenesis and angiogenesis, which could accelerate tendon healing. Therefore, in vitro studies with PDGF-BB have been performed to determine its effect on tenocytes and tenoblasts. Moreover, accurate and sophisticated drug delivery devices, aiming for a sustained release of PDGF-BB, have been developed, either by using heparin-binding and fibrin-based matrices or different electrospinning techniques...
July 17, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/28714045/characterization-drug-loading-and-antibacterial-activity-of-nanohydroxyapatite-polycaprolactone-nha-pcl-electrospun-membrane
#5
Mohd Izzat Hassan, Naznin Sultana
Considering the important factor of bioactive nanohydoxyapatite (nHA) to enhance osteoconductivity or bone-bonding capacity, nHA was incorporated into an electrospun polycaprolactone (PCL) membrane using electrospinning techniques. The viscosity of the PCL and nHA/PCL with different concentrations of nHA was measured and the morphology of the electrospun membranes was compared using a field emission scanning electron microscopy. The water contact angle of the nanofiber determined the wettability of the membranes of different concentrations...
August 2017: 3 Biotech
https://www.readbyqxmd.com/read/28713016/a-conducive-bioceramic-polymer-composite-biomaterial-for-diabetic-wound-healing
#6
Fang Lv, Jie Wang, Peng Xu, Yiming Han, Hongshi Ma, He Xu, Shijie Chen, Jiang Chang, Qinfei Ke, Mingyao Liu, Zhengfang Yi, Chengtie Wu
Diabetic wound is a common complication of diabetes. Biomaterials offer great promise in inducing tissue regeneration for chronic wound healing. Herein, we reported a conducive Poly (caprolactone) (PCL)/gelatin nanofibrous composite scaffold containing silicate-based bioceramic particles (Nagelschmidtite, NAGEL, Ca7P2Si2O16) for diabetic wound healing. NAGEL bioceramic particles were well distributed in the inner of PCL/gelatin nanofibers via co-electrospinning process and the Si ions maintained a sustained release from the composite scaffolds during the degradation process...
July 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28712345/post-processing-optimization-of-electrospun-sub-micron-poly-3-hydroxybutyrate-fibers-to-obtain-continuous-films-of-interest-in-food-packaging-applications
#7
A Cherpinski, S Torres-Giner, L Cabedo, J M Lagaron
Polyhydroxyalkanoates (PHAs) are one of the most researched family of biodegradable polymers based on renewable materials due to their thermoplastic nature and moisture resistance. The present study was targeted to investigate the preparation and characterization of poly(3-hydroxybutyrate) (PHB) films obtained through the electrospinning technique. To convert them into continuous films, of interest in for instance packaging, the electrospun fiber mats were subsequently post-processed by different physical treatments to optimize their physical performance...
July 17, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28711834/novel-reusable-porous-polyimide-fibers-for-hot-oil-adsorption
#8
Lidong Tian, Chongyin Zhang, Xiaowei He, Yongqiang Guo, Mingtao Qiao, Junwei Gu, Qiuyu Zhang
The development of oil sorbents with high thermal stability, adsorption capacity, reusability and recoverability is of great significance for hot oil leakage protection, especially for oil spillage of oil refinery, petrochemical industry and cars. In our work, highly efficient hot oil adsorption of polyimide (PI) fibers with excellent thermal stability was successfully prepared by a facile electrospinning method followed by post-treatment. The corresponding morphologies, structures and oil adsorption properties of as-prepared PI fibers at different temperatures were analyzed and characterized...
June 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28711618/fabrication-of-bi-layer-scaffold-of-keratin-nanofiber-and-gelatin-methacrylate-hydrogel-implications-for-skin-graft
#9
Jong Wook Kim, Min Jin Kim, Chang Seok Ki, Hyun Jeong Kim, Young Hwan Park
Bi-layer scaffold composed of human hair keratin/chitosan nanofiber mat and gelatin methacrylate (GelMA) hydrogel was fabricated by using electrospinning and photopolymerization techniques. To prepare the nanofiber layer, the blend solution of human hair keratin and chitosan (mixture ratio: 5/5) was electrospun using formic acid as a solvent in the presence of poly(ethylene glycol), followed by cross-linking with glutaraldehyde. The tensile strength of the human hair keratin/chitosan nanofiber mat was much higher than that of pure human hair keratin nanofiber mat...
July 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28710484/colored-and-fluorescent-nanofibrous-silk-as-a-physically-transient-chemosensor-and-vitamin-deliverer
#10
Kyungtaek Min, Sookyoung Kim, Chang Gun Kim, Sunghwan Kim
Biodegradable and physically transient optics represent an emerging paradigm in healthcare devices by harnessing optically active system and obviating issues with chronic uses. Light emitting components that can efficiently interact with their environments have advantages of high sensitivity, visibility, and wireless operation. Here, we report a novel combination of silk biopolymer and optically active organic dyes resulting in versatile fluorescent silk nanofibers (FSNs). FSNs generated by the electrospinning method exhibit attractive functions of the doped organic dyes along with programming the system that physically disappear at prescribed time...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28708376/self-healing-nano-textured-vascular-like-materials-mode-i-crack-propagation
#11
Minwook Lee, Soumyadip Sett, Seongpil An, Sam Sukgoo Yoon, Alexander L Yarin
Here we investigate crack propagation initiated from an initial notch in a self-healing material. The crack propagation in the core-shell nanofiber mats formed by co-electrospinning and the composites reinforced by them is in focus. All samples are observed from the crack initiation until complete failure. Due to the short-time experiments done on purpose, the resin and cure released from the cores of the core-shell nanofibers could not achieve a complete curing and stop crack growth, especially given the fact that no heating was used...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28707508/design-and-fabrication-of-porous-biodegradable-scaffolds-a-strategy-for-tissue-engineering
#12
Vahideh Raeisdasteh Hokmabad, Soodabeh Davaran, Ali Ramazani, Roya Salehi
Current strategies of tissue engineering are focused on the reconstruction and regeneration of damaged or deformed tissues by grafting of cells with scaffolds and biomolecules. Recently, much interest is given to scaffolds which are based on mimic the extracellular matrix that have induced the formation of new tissues. To return functionality of the organ, the presence of a scaffold is essential as a matrix for cell colonization, migration, growth, differentiation and extracellular matrix deposition, until the tissues are totally restored or regenerated...
July 14, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28705624/evaluation-of-three-layered-doxycycline-collagen-loaded-nanofiber-wound-dressing
#13
Tort Serdar, Acartürk Füsun, Beşikci Arzu
Nanofiber wound dressings have great potential for both acute and chronic wound healing. The aim of this study is to develop a wound dressing by the electrospinning method and to determine its in vitro characteristics. The viscosity and the surface tension values of the polymer solutions used in the electrospinning were measured and their suitability for electrospinning was evaluated. Nanofiber wound dressing consists of three layers. The core of the coaxial nanofibers that comprises the first layer of the wound dressing contains 1% polycaprolactone and 4...
July 10, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28702988/mesoporous-sno2-nanotubes-via-electrospinning-etching-route-highly-sensitive-and-selective-detection-of-h2s-molecule
#14
Peresi Majura Bulemo, Hee-Jin Cho, Nam-Hoon Kim, Il-Doo Kim
In this work, we report the facile synthesis of thin-walled SnO2 nanotubes (NTs) with numerous clustered pores (pore radius 6.56 nm) and high surface area (125.63 m2/g) via selective etching of core (SiO2) region in SiO2-SnO2 composite nanofibers (NFs), in which SnO2 phase preferentially occupies the shell while SiO2 is concentrated in the center of the composite NFs. The SiO2-etched SnO2 NTs are composed of ultrasmall crystallites (~6 nm in size) originating from crystal growth inhibition by small SiO2 domains, which are partially segregated in the polycrystalline SnO2 shell during calcination...
July 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28699660/binding-of-indocyanine-green-in-polycaprolactone-fibers-using-blend-electrospinning-for-in-vivo-laser-assisted-vascular-anastomosis
#15
Annemarie Schönfeld, Zacharia Mbäıdjol Kabra, Mihai Constantinescu, Dieter Bosshardt, Michael H Stoffel, Kirsten Peters, Martin Frenz
BACKGROUND AND OBJECTIVE: The clinical application of laser-assisted vascular anastomosis is afflicted by unreliable and low bonding strengths as well as tedious handling during microvascular surgery. The challenge to be met arises from the flow-off of the chromophore during soldering that changes the absorption and stains the surrounding tissue, leading to an uncontrollable thermal damage zone. In this study, we investigated the feasibility to produce an indocyanine green (ICG)-loaded patch by electrospinning and tested its applicability to both in vitro and in vivo microvascular laser soldering...
July 12, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28699282/controllable-synthesis-of-ultra-thin-nico2o4-nanosheet-incorporated-composite-nanotubes-towards-efficient-oxygen-reduction
#16
Yunpeng Huang, Fen Cui, Yan Zhao, Jian Bao, Jiabiao Lian, Yuanguo Xu, Tianxi Liu, Hua-Ming Li
Exploring non-precious metal-based ORR electrocatalysts featuring high efficiency, low cost and environmental friendliness is of great importance for the broad applications of fuel cells and metal-air batteries. In this work, one-dimensional (1D) SnO2 nanotubes (SNT) deposited with ultra-thin NiCo2O4 nanosheets was successfully fabricated through a productive electrospinning technique followed by sintering and low-temperature co-precipitation strategy. This hierarchically engineered architecture has ultrathin NiCo2O4 nanosheets uniformly and fully erecting on both walls of tubular SNT, which manifests improved electrochemical activity as oxygen reduction reaction (ORR) catalyst in terms of positive onset potential and high current density, as well as superior tolerance to crossover effects and long-term durability with respect to the commercial Pt/C catalyst...
July 12, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28699224/melt-electrospinning-writing-of-poly-hydroxymethylglycolide-co-%C3%AE%C2%B5-caprolactone-based-scaffolds-for-cardiac-tissue-engineering
#17
Miguel Castilho, Dries Feyen, María Flandes-Iparraguirre, Gernot Hochleitner, Jürgen Groll, Pieter A F Doevendans, Tina Vermonden, Keita Ito, Joost P G Sluijter, Jos Malda
Current limitations in cardiac tissue engineering revolve around the inability to fully recapitulate the structural organization and mechanical environment of native cardiac tissue. This study aims at developing organized ultrafine fiber scaffolds with improved biocompatibility and architecture in comparison to the traditional fiber scaffolds obtained by solution electrospinning. This is achieved by combining the additive manufacturing of a hydroxyl-functionalized polyester, (poly(hydroxymethylglycolide-co-ε-caprolactone) (pHMGCL), with melt electrospinning writing (MEW)...
July 12, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28698065/the-effect-of-poly-lactic-co-glycolic-acid-composition-on-the-mechanical-properties-of-electrospun-fibrous-mats
#18
X L Liu, J Aho, S Baldursdottir, A Bohr, H Qu, L P Christensen, J Rantanen, M Yang
The aim of this study was to investigate the influence of polymer molecular structure on the electrospinnability and mechanical properties of electrospun fibrous mats (EFMs). Polymers with similar molecular weight but different composition ratios (lactic acid (LA) and glycolic acid (GA)) were dissolved in binary mixtures of N,N-dimethylformamide (DMF) and tetrahydrofuran (THF). The intrinsic viscosity and rheological properties of polymer solutions were investigated prior to electrospinning. The morphology and mechanical properties of the resulting EFMs were characterized by scanning electron microscope (SEM) and dynamic mechanical analysis (DMA)...
July 8, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28696444/facile-electrospinning-formation-of-carbon-confined-metal-oxide-cube-in-tube-nanostructures-for-stable-lithium-storage
#19
Ziang Liu, Ruiting Guo, Jiashen Meng, Xiong Liu, Xuanpeng Wang, Qi Li, Liqiang Mai
A unique carbon-confined metal oxide cube-in-tube nanostructure is synthesized by a facile precursor-modified electrospinning method with subsequent pyrolysis. This nanostructure has a partly graphitized carbon layer with manganese oxide nanoparticles embedded as the tube and amorphous CoSnO3 hollow cubes uniformly distributed inside the tube. As a lithium-ion battery anode, this architecture exhibits a high reversible discharge capacity and rate capability.
July 11, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28695751/watercress-based-electrospun-nanofibrous-scaffolds-enhance-proliferation-and-stemness-preservation-of-human-adipose-derived-stem-cells
#20
Mehdi Dadashpour, Younes Pilehvar-Soltanahmadi, Seyed Abolghasem Mohammadi, Nosratollah Zarghami, Mohammad Pourhassan-Moghaddam, Effat Alizadeh, Mohammad Jafar Maleki, Akram Firouzi-Amandi, Mohammad Nouri
The present study describes the effects of Watercress extract (WE) based electrospun nanofibrous mats on the regulation of adhesion, proliferation, cytoprotection and stemness preservation of adipose-derived stem cells (ADSCs). Watercress (Nasturtium officinale) is one of the most important medicinal plant with a board spectrum of biological functions. For this purpose, WE-loaded PCL-PEG nanofibers were fabricated by electrospinning and characterized using FE-SEM and FTIR. Adhesion, proliferation and cytoprotection of ADSCs on the nanofibers was investigated using FE-SEM and MTT assays...
July 11, 2017: Artificial Cells, Nanomedicine, and Biotechnology
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