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https://www.readbyqxmd.com/read/29684268/conducting-polymers-for-tissue-engineering
#1
Baolin Guo, Peter X Ma
Electrically conducting polymers such as polyaniline, polypyrrole, polythiophene and their derivatives (mainly aniline oligomer and poly(3,4-ethylenedioxythiophene)) with good biocompatibility find wide applications in biomedical fields including bioactuators, biosensors, neural implants, drug delivery systems and tissue engineering scaffolds. This review focuses on these conductive polymers for tissue engineering application. Conductive polymers exhibited promising conductivity as bioactive scaffolds for tissue regeneration and their conductive nature allows cells or tissue cultured on them to be stimulated by electrical signals...
April 23, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29683644/si-void-c-nanofibers-fabricated-using-a-self-powered-electrospinning-system-for-lithium-ion-batteries
#2
Yu Han, Jingdian Zou, Zhen Li, Wenqiang Wang, Yang Jie, Jinming Ma, Bin Tang, Qi Zhang, Xia Cao, Shengming Xu, Zhong Lin Wang
In recent years, research in lithium-ion batteries (LIBs) has been focused on improving their performance in various ways, such as density, capacity and life time, but little attention has been paid to the energy consumption costed in the manufacturing process. Herein, we report an energy-efficient preparation method of anode materials for LIBs based on a self-powered electrospinning system without an external power source, which consists of a rotatory triboelectric nanogenerator (r-TENG), a power management circuit and an electrospinning unit...
April 23, 2018: ACS Nano
https://www.readbyqxmd.com/read/29683273/micelle-coated-hierarchically-structured-nanofibers-with-dual-release-capability-for-accelerated-wound-healing-and-infection-control
#3
Victoria Albright, Meng Xu, Anbazhagan Palanisamy, Jun Cheng, Mary Stack, Beilu Zhang, Arul Jayaraman, Svetlana A Sukhishvili, Hongjun Wang
Tailoring nanofibrous matrices-a material with much promise for wound healing applications-to simultaneously mitigate bacterial colonization and stimulate wound closure of infected wounds is highly desirable. To that end, a dual-releasing, multiscale system of biodegradable electrospun nanofibers coated with biocompatible micellar nanocarriers is reported. For wound healing, transforming growth factor-β1 is incorporated into polycaprolactone/collagen (PCL/Coll) nanofibers via electrospinning and the myofibroblastic differentiation of human dermal fibroblasts is locally stimulated...
April 23, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29682643/determining-electrospun-morphology-from-the-properties-of-protein-polymer-solutions
#4
Hao Zhang, Shixia Xi, Yingchun Han, Lunyang Liu, Bo Dong, Zhijie Zhang, Quan Chen, Weihong Min, Qingrong Huang, Yunqi Li, Jingsheng Liu
Integrating natural macromolecules, e.g. proteins, is a progressive trend in the fabrication of biocompatible sub-micrometer fibers with tunable diameters using the electrospinning technique. The correlation between solution properties and electrospun morphology is critical; it is quite clear for synthetic linear polymer solutions but remains uncertain for solutions with protein. Here, we report the determination of electrospun morphology in protein-polymer solutions of poly(ethylene oxide) (PEO) and zein, a storage protein from corn...
April 23, 2018: Soft Matter
https://www.readbyqxmd.com/read/29680608/electrospun-nanofibers-decorated-with-bio-sonochemically-synthesized-gold-nanoparticles-as-an-ultrasensitive-probe-in-amalgam-based-mercury-ii-detection-system
#5
Zohreh Parsaee
In this study, bio-ultrasound-assisted synthesized gold nanoparticles using Gracilaria canaliculata algae have been immobilized on a polymeric support and used as a glassy probe chemosensor for detection and rapid removal of Hg2+ ions. The function of the suggested chemosensor has been explained based on gold-amalgam formation and its catalytic role on the reaction of sodium borohydride and rhodamine B (RhB) with fluorescent and colorimetric sensing function. The catalyzed reduction of RhB by the gold amalgam led to a distinguished color change from red and yellow florescence to colorless by converting the amount of Hg2+ deposited on Au-NPs...
June 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29680598/ultrasound-electrospinning-assisted-fabrication-and-sensing-evaluation-of-a-novel-membrane-as-ultrasensitive-sensor-for-copper-ii-ions-detection-in-aqueous-environment
#6
Wei Gao, Pouya Haratipour, Mohammad Reza Rezaei Kahkha, Arash Tahvili
The present study has reported an optimized fabrication and application of a novel PVA/TEOS/Schiff base nanofibers membrane as a highly sensitive copper (II) ions in aqueous environment. Here in, for first time, an ultrasound-assisted synthesized symmetric Schiff base has been immobilized on a hybrid polyvinyl alcohol (PVA) and TEOS using electrospinning technique for detection and filtration of copper ions. For this purpose, various working parameters were evaluated and finally the optimized nano fibers membrane was synthesized with 72 nm thickness and PVA/TEOS/Schiff base ratio of (wt%) 8:6:1...
June 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29679329/crimped-electrospun-fibers-for-tissue-engineering
#7
Pen-Hsiu Grace Chao
Collagen fibers exist in many parts of the body as parallel bundles with a wavy morphology, known as crimp. This crimp structure contributes to the nonlinear mechanical properties of the tissue, such as ligament, blood vessels, and intestine, which provide elasticity and prevent injury. To recapitulate the native collagen crimp structure, we report a robust method using electrospinning and post-processing to generate parallel polymeric fibers with crimp that simulate the structure-function relationship of native tissue mechanics...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29679320/electrospinning-functionalized-polymers-for-use-as-tissue-engineering-scaffolds
#8
Lesley W Chow
Electrospinning polymers is a versatile technique to generate fibrous, three-dimensional scaffolds for tissue engineering applications. Modifying polymers with functional groups prior to electrospinning offers the opportunity to control the spatial presentation of functional groups within the scaffold as well as incorporate multiple bioactive cues. This chapter describes methods to modify poly(ε-caprolactone) (PCL) with peptides and electrospin these peptide-PCL conjugates to functionalize a scaffold surface in a single step...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29677821/tailor-made-electrospun-multilayer-composite-polymer-electrolytes-for-high-performance-lithium-polymer-batteries
#9
Du-Hyun Lim, Anupriya K Haridas, Stelbin Peter Figerez, Prasanth Raghavan, Aleksandar Matic, Jou-Hyeon Ahn
A novel tailor-made multilayer composite polymer electrolyte, consisting of two outer layers of electrospun polyacrylonitrile (PAN) and one inner layer of poly(vinyl acetate) (PVAc)/poly(methyl methacrylate) (PMMA)/poly(ethylene oxide) (PEO) fibrous membrane, was prepared using continuous electrospinning. These membranes, which are made up of fibers with diameters in the nanometer range, were stacked in layers to produce interconnected pores that result in a high porosity. Gel polymer electrolytes (GPEs) were prepared by entrapping a liquid electrolyte (1 M LiPF6 in ethylene carbonate/dimethyl carbonate) in the membranes...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29677404/hybrid-scaffolds-of-mg-alloy-mesh-reinforced-polymer-extracellular-matrix-composite-for-critical-sized-calvarial-defect-reconstruction
#10
Yingqi Chen, Sang-Ho Ye, Hideyoshi Sato, Yang Zhu, Vesselin Shanov, Tarannum Tiasha, Antonio D'Amore, Samuel Luketich, Guojiang Wan, William R Wagner
The challenge of developing scaffolds to reconstruct critical-sized calvarial defects without the addition of high levels of exogenous growth factor remains relevant. Both osteogenic regenerative efficacy as well as suitable mechanical properties for the temporary scaffold system are of importance. In this study, a Mg alloy mesh reinforced polymer/demineralized bone matrix (DBM) hybrid scaffold was designed where the hybrid scaffold was fabricated by a concurrent electrospinning/electrospraying of poly(lactic-co-glycolic) (PLGA) polymer and DBM suspended in hyaluronic acid (HA)...
April 20, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29677145/polymer-based-electrospun-nanofibers-for-biomedical-applications
#11
REVIEW
Abdullah M Al-Enizi, Moustafa M Zagho, Ahmed A Elzatahry
Electrospinning has been considered a promising and novel procedure to fabricate polymer nanofibers due to its simplicity, cost effectiveness, and high production rate, making this technique highly relevant for both industry and academia. It is used to fabricate non-woven fibers with unique characteristics such as high permeability, stability, porosity, surface area to volume ratio, ease of functionalization, and excellent mechanical performance. Nanofibers can be synthesized and tailored to suit a wide range of applications including energy, biotechnology, healthcare, and environmental engineering...
April 20, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29674743/native-collagen-hydrogel-nanofibres-with-anisotropic-structure-using-core-shell-electrospinning
#12
Yuka Wakuda, Shohei Nishimoto, Shin-Ichiro Suye, Satoshi Fujita
Collagen hydrogel is a popular extracellular matrix (ECM) material in regenerative medicine and has an isotropic structure. In contrast, native ECM has an anisotropic structure. Electrospinning of collagen dissolved in organic solvents is widely used for fabricating anisotropic collagen nanofibres; however, such fibres are water-soluble and require cross-linking before use as scaffolds for cell culture. Herein, electrospinning using a core-shell nozzle was employed to spin an aqueous acidic solution of collagen and encapsulate it within a shell of polyvinylpyrrolidone (PVP)...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29674091/a-superfast-hexavalent-chromium-scavenger-magnetic-nanocarbon-bridged-nanomagnetite-network-with-excellent-recyclability
#13
Xiaojiang Xu, Hongyuan Zhang, Chao Ma, Hongbo Gu, Han Lou, Shangyun Lyu, Chaobo Liang, Jie Kong, Junwei Gu
In this work, a nanocarbon bridged nanomagnetite network (NC-NMN) is developed through the electrospinning of epichlorohydrin functionalized polystyrene (f-PS), followed by the direct calcination of f-PS and ferric nitrate, which is capable of superfast removing hexavalent chromium (Cr(VI)) from polluted water within only 15 s benefiting from its gridding framework, with an adsorption rate constant of 1.64 g mg-1  min-1 according to the pseudo-second-order kinetics. The well-fitted Langmuir isotherm model indicates a monolayer adsorption for Cr(VI) on NC-NMN...
April 10, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29673978/enhanced-antibacterial-nanocomposite-mats-by-coaxial-electrospinning-of-polycaprolactone-fibers-loaded-with-zn-based-nanoparticles
#14
Gina Prado-Prone, Phaedra Silva-Bermudez, Argelia Almaguer-Flores, Jorge A García-Macedo, Victor I García, Sandra E Rodil, Clemente Ibarra, Cristina Velasquillo
ZnO and Zn acetate nanoparticles were embedded in polycaprolactone coaxial-fibers and uniaxial-fibers matrices to develop potential antibacterial nanocomposite wound dressings. Morphology, composition, wettability, crystallinity and fiber structure of mats were characterized. Antibacterial properties of mats were tested against E. coli and S. aureus by turbidity and MTT assays. The effect of UVA illumination (prior to bacteria inoculation) on mats' antibacterial activity was also studied. Results showed that a coaxial-fibers design maintained nanoparticles distributed in the outer shell of fibers and, in general, enhanced the antibacterial effect of the mats, in comparison to conventional uniaxial-fibers mats...
April 16, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29673841/electrospun-silk-fibroin-fibers-for-storage-and-controlled-release-of-human-platelet-lysate
#15
Cataldo Pignatelli, Giovanni Perotto, Marta Nardini, Ranieri Cancedda, Maddalena Mastrogiacomo, Athanassia Athanassiou
Human platelet lysate (hPL) is a pool of growth factors and cytokines able to induce regeneration of different tissues. Despite its good potentiality as therapeutic tool for regenerative medicine applications, hPL has been only moderately exploited in this field. A more widespread adoption has been limited because of its rapid degradation at room temperature that decreases its functionality. Another limiting factor for its extensive use is the difficulty of handling the hPL gels. In this work, silk fibroin-based patches were developed to address several points: improving the handling of hPL, enabling their delivery in a controlled manner and facilitating their storage by creating a device ready to use with expanded shelf life...
April 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29671312/a-flexible-polymer-ultra-fine-fiber-with-extreme-toughness
#16
Guangliang Zhou, Guang Yang, Xilin Li, Baiyi Chen, Jing Fan, Xu Hou, Shaobing Zhou
Fiber materials with multilevel interior structures have myriad applications in many fields due to their unique properties. In this study, we develop a bio-inspired flexible ultra-fine polymer fiber via an integrated microfluidic-electrospinning technology. The fiber possesses periodic hollow and tubular chambers with a shell layer of approximately 150 nm in thickness extremely like natural bamboo. The single fiber with a diameter of ~1.5 µm exhibits the Young's modulus ranging from 2-7 MPa measured with atomic force microscopy (AFM)...
April 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29670835/preparation-of-the-potential-ocular-inserts-by-electrospinning-method-to-achieve-the-prolong-release-profile-of-triamcinolone-acetonide
#17
Shahla Mirzaeei, Kaveh Berenjian, Rasol Khazaei
Purpose: The poor bioavailability of drugs in the ocular delivery systems is an important issue and development of delivery systems with prolonged release profile could be in a major importance. This study aims to develop an ocular delivery system using electrospun nanofibers to be a candidate insert for delivery of triamcinolone acetonide. Methods: For this purpose, three different chitosan-based formulations were prepared by electrospinning method, and electrospun nanofibers were compared to a formulation comprising hydrophobic polymers (Eudragit S100 and Zein)...
March 2018: Advanced Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29665286/a-strategy-for-rapid-construction-of-blood-vessel-like-structures-with-complex-cell-alignments
#18
Nuoxin Wang, Yunhu Peng, Wenfu Zheng, Lixue Tang, Shiyu Cheng, Junchuan Yang, Shaoqin Liu, Wei Zhang, Xingyu Jiang
A method is developed that can rapidly produce blood vessel-like structures by bonding cell-laden electrospinning (ES) films layer by layer using fibrin glue within 90 min. This strategy allows control of cell type, cell orientation, and material composition in separate layers. Furthermore, ES films with thicker fibers (polylactic-co-glycolic acid, fiber diameter: ≈3.7 µm) are used as cell-seeding layers to facilitate the cell in-growth; those with thinner fibers (polylactic acid, fiber diameter: ≈1.8 µm) are used as outer reinforcing layers to improve the mechanical strength and reduce the liquid leakage of the scaffold...
April 17, 2018: Macromolecular Bioscience
https://www.readbyqxmd.com/read/29663927/encapsulation-of-5-flurouracil-into-plga-nanofibers-and-enhanced-anticancer-effect-in-combination-with-ajwa-dates-extract-phoenix-dactylifera-l
#19
Fazal Khan, Musab Aldhahri, Mohammad Asif Hussain, Kalamegam Gauthaman, Adnan Memic, Adel Abuzenadah, Taha Kumosani, Elie Barbour, Nazeeh Shuja Alothmany, Rabah Wasil Aldhaheri
Side effects connected with chemotherapeutic agents used in cancer treatment has led to alternative modalities of combinatorial therapies in an attempt to reduce the drug dosage and associated risks. In the current study we evaluated the potential use of Ajwa Dates Extract (ADE), reported to have anti-cancer effects, as an adjuvant therapy in combination with 5-flurouracil (5FU) against the human-breast-adenocarcinoma cell line (MFC-7) in vitro. The effects of ADE alone and in combination with 5-FU were evaluated in terms of cell viability and cytotoxicity...
March 1, 2018: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29663925/the-investigation-of-zno-poly-vinylidene-fluoride-nanocomposites-with-improved-mechanical-piezoelectric-and-antimicrobial-properties-for-orthopedic-applications
#20
Yuan Li, Linlin Sun, Thomas J Webster
Studies have shown that piezoelectric materials can be used as bioactively charged surfaces to induce tissue regeneration (like bone reconstruction). β-phase poly(vinylidene fluoride) (PVDF) and zinc oxide (ZnO) are regarded as potential bone tissue engineering materials because of their piezoelectricity and biocompatibility. Additionally, ZnO nanoparticles (NPs) are ideal materials to reduce infection. In this study, PVDF scaffolds doped with ZnO NPs (ZnO/PVDF) were prepared by electrospinning increasing ZnO concentrations and the ratio of the β-phase PVDF resulting in an enhanced the modulus, elongation to failure and load stress...
March 1, 2018: Journal of Biomedical Nanotechnology
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