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https://www.readbyqxmd.com/read/28549376/one-step-electrospinning-route-of-srtio3-modified-rutile-tio2nanofibers-and-its-photocatalytic-properties
#1
Weijie Zhao, Jing Zhang, Jiaqi Pan, Jianfeng Qiu, Jiantao Niu, Chaorong Li
The SrTiO3 modified rutile TiO2 composite nanofibers were synthesized by a simple electrospinning technique. The result of XRD, SEM and TEM indicate that the SrTiO3/TiO2 heterojuction has been prepared successfully. Compared with the TiO2 and SrTiO3, the photocatalytic activity of the SrTiO3/TiO2 (rutile) for the degradation of methyl orange exhibits an obvious enhancement under UV illumination. which is almost 2 times than that of bare TiO2 (rutile) nanofiber. Further, the high crystallinity and photon-generated carrier separation of the SrTiO3/TiO2 heterojuction are considered as the main reason for this enhancement...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28548859/separation-of-oil-in-water-emulsions-using-hydrophilic-electrospun-membranes-with-anisotropic-pores
#2
Weerapha Panatdasirisuk, Zhiwei Liao, Thammasit Vongsetskul, Shu Yang
It has been challenging to separate oil from oil/water emulsions with droplet size less than 1 μm using conventional porous membranes. Membranes with small pores are preferred, but the trade-off is a dramatic reduction of volumetric flux. Here, we prepared membranes from electrospun polycaprolactone (PCL) fibers with high porosity (∼88%). When the membranes were stretched uniaxially at different strain levels, the pores became anisotropic with an aspect ratio (pore length/width) up to 5.3 ± 3.0. To improve their wettability, we added Tween 80, a hydrophilic surfactant, to PCL solutions for electrospinning...
May 26, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28547847/stretchable-platinum-network-based-transparent-electrodes-for-highly-sensitive-wearable-electronics
#3
Yuting Wang, Jing Cheng, Yan Xing, Muhammad Shahid, Hiroki Nishijima, Wei Pan
A platinum network-based transparent electrode has been fabricated by electrospinning. The unique nanobelt structured electrode demonstrates low sheet resistance (about 16 Ω sq(-1) ) and high transparency of 80% and excellent flexibility. One of the most interesting demonstrations of this Pt nanobelt electrode is its excellent reversibly resilient characteristic. The electric conductivity of the flexible Pt electrode can recover to its initial value after 160% extending and this performance is repeatable and stable...
May 26, 2017: Small
https://www.readbyqxmd.com/read/28547766/local-release-of-vegf-using-fiber-mats-enables-effective-transplantation-of-layered-cardiomyocyte-sheets
#4
Kenichi Nagase, Yuhei Nagumo, Miri Kim, Hee-Jung Kim, Hei-Won Kyung, Hye-Jin Chung, Hidekazu Sekine, Tatsuya Shimizu, Hideko Kanazawa, Teruo Okano, Seung-Jin Lee, Masayuki Yamato
Cell sheet transplantation is a key tissue engineering technology. A vascular endothelial growth factor (VEGF)-releasing fiber mat is developed for the transplantation of multilayered cardiomyocyte sheets. Poly(vinyl alcohol) fiber mats bearing poly(lactic-co-glycolic acid) nanoparticles that incorporate VEGF are fabricated using electrospinning and electrospray methods. Six-layered cardiomyocyte sheets are transplanted with a VEGF-releasing mat into athymic rats. After two weeks, these sheets produce thicker cardiomyocyte layers compared with controls lacking a VEGF-releasing mat, and incorporate larger-diameter blood vessels containing erythrocytes...
May 26, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28544959/effect-of-different-mineralization-processes-on-in-vitro-and-in-vivo-bone-regeneration-and-osteoblast-macrophage-cross-talk-in-co-culture-system-using-dual-growth-factor-mediated-non-mulberry-silk-fibroin-grafted-poly-%C3%B0-caprolactone-nanofibrous-scaffold
#5
Promita Bhattacharjee, Tapas K Maiti, Debasis Bhattacharya, Samit Kumar Nandi
This study evaluates mineralized nanofibrous polymeric scaffolds at supporting in vitro osteogenic differentiation of human mesenchymal stem cells (hMSCs) and in vivo bone tissue regeneration. Co-electrospin, alternative soaking, and electrodeposition were used to introduce hydroxyapatite in non-mulberry silk fibroin grafted poly(Є-caprolactone) nanofibrous scaffolds. Bone morphogenic protein-2 and Transforming growth factor-β, at a potency ratio of 1:1, are covalently coupled onto the scaffolds. hMSCs proliferation and interactions are studied through MTT and Alamar blue assay and scanning electron and confocal microscopy...
May 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28544348/galectin-1-promotes-an-m2-macrophage-response-to-polydioxanone-scaffolds
#6
Daniel Abebayehu, Andrew Spence, Barbara D Boyan, Zvi Schwartz, John J Ryan, Michael J McClure
Regulating soft tissue repair to prevent fibrosis and promote regeneration is central to creating a microenvironment conducive to soft tissue development. Macrophages play an important role in this process. Their response can be modulated using biomaterials, altering cytokine and growth factor secretion to promote regeneration. Electrospun polydioxanone (PDO) fiber scaffolds promoted an M2 phenotype when macrophages were cultured on large diameter, highly porous scaffolds, but an M1 phenotype on smaller diameter fibers...
May 22, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28544201/influence-of-highly-porous-electrospun-plga-pcl-nha-fibrous-scaffolds-on-the-differentiation-of-tooth-bud-cells-in-vitro
#7
Xinjie Cai, Sofie Ten Hoopen, Weibo Zhang, Charles Yi, Wanxun Yang, Fang Yang, John A Jansen, X Frank Walboomers, Pamela C Yelick
In this study, we investigated the use of three-dimensional electrospun poly(lactic-co-glycolic acid)/poly(ε-caprolactone) (PLGA/PCL) scaffolds seeded and cultured with postnatal dental cells, for improved dental tissue regeneration. Wet-electrospinning combined with ultrasonic treatment was studied as a method to enhance scaffold porosity and to promote cell-cell interactions. We also investigated whether nano-hydroxyapatite (nHA) incorporation could enhance dental cell differentiation. All scaffolds were seeded with human tooth pulp-derived dental mesenchymal (hDM) cells, or a combination of hDM and pig dental epithelial (pDE) cells, cultured for up to 28 days...
May 24, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28543628/tunable-wettability-of-electrospun-polyurethane-silica-composite-membranes-for-effective-separation-of-water-in-oil-and-oil-in-water-emulsions
#8
Libin Liu, Wenyuan Fang, Gailan Guo
Polymer-dominated membranes with switchable wettability are highly desired due to their on-demand applications for oil/water separation. Herein, we report a low-cost methodology to fabricate membranes consisting of hyperbranched polyurethane (HBPU) and fluorine-modified silica (F-SiO2) with tunable wettability by electrospinning. The HBPU/F-SiO2 composite membranes can be transformed from superhydrophobicity to superhydrophilicity via plasma treatment, which exhibit different wettability for effective separation of surfactant-stabilized water-in-oil and oil-in-water emulsions...
May 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28539044/the-effect-of-resveratrol-on-modulation-of-endothelial-cells-and-macrophages-for-rapid-vascular-regeneration-from-electrospun-poly-%C3%AE%C2%B5-caprolactone-scaffolds
#9
Zhihong Wang, Yifan Wu, Jianing Wang, Chuangnian Zhang, Hongyu Yan, Meifeng Zhu, Kai Wang, Chen Li, Qingbo Xu, Deling Kong
Rapid endothelialization is one key factor that determines the success of small diameter vascular grafts as an artery substitute in the treatment of cardiovascular disease. Aimed to facilitate vascular regeneration, we developed a vascular scaffold loaded with resveratrol, which is a natural compound extracted from plants and showed multifaceted effects in cardiovascular protection. The tubular poly (ε-caprolactone) (PCL) scaffold was prepared by electrospinning with resveratrol in the PCL solution. In vitro assay demonstrated that resveratrol could be released from the scaffolds in a sustained and controlled manner...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537074/polylactic-acid-nanofibers-scaffold-decorated-with-chitosan-island-like-topography-for-bone-tissue-engineering
#10
Ting Xu, Hongyang Yang, Dongzhi Yang, Zhong-Zhen Yu
In this work, a bicomponent scaffold with a core-shell and island-like structure that combines the respective advantages of polylactic acid (PLA) and chitosan (CS) was prepared via electrospinning accmopanied by an automatic phase separation and crystallization. The aim of this study was to introduce nanosized topography, and the high bioactivity of chitosan onto PLA nanofibers to enhance the cell biocompatibility of PLA scaffolds. The morphology, inner structure, surface composition, crystallinity, and thermodynamic analysis of nanofibers with various PLA/CS ratios were respectively characterized, and the formation mechanism of a core-shell or island-like topography structure was also speculated...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28535347/preparation-and-characterization-of-protein-loaded-electrospun-fiber-mat-and-its-release-kinetics
#11
Peng Wen, Yan Wen, Xiao Huang, Minhua Zong, Hong Wu
For the enhancement of protein's bioavailability, a specific delivery system was developed by coaxial electrospinning. Bovine serum albumin (BSA) was used as protein model and the core-sheath fiber mat was fabricated using sodium alginate as shell layer and the BSA-loaded chitosan nanoparticle that prepared previously as core layer. By optimizing electrospinning parameters, uniform fibers with diameters ranging from 200 nm to 600 nm were obtained, and transmission electron microscopy and confocal laser scanning microscopy revealed its core-sheath structure...
May 23, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28535035/fabrication-of-anti-biofouling-plasma-filtration-membrane-by-electrospinning-process-using-photo-crosslinkable-zwitterionic-phospholipid-polymers
#12
Jiae Seo, Ji-Hun Seo
The goal of this study is to fabricate a stable plasma filtration membrane with anti-biofouling properties via an electrospinning process. To this end, a random-type copolymer consisting of zwitterionic phosphorylcholine (PC) groups and ultraviolet (UV)-crosslinkable phenyl azide groups was synthesized. The zwitterionic PC group provides anti-biofouling properties, and the phenyl azide group enables the stable maintenance of the fibrous nanostructure of hydrophilic zwitterion polymers in aqueous medium via a simple UV curing process...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534283/cell-type-specific-extracellular-matrix-guided-the-differentiation-of-human-mesenchymal-stem-cells-in-3d-polymeric-scaffolds
#13
Yong Mao, Tyler Hoffman, Amy Wu, Ritu Goyal, Joachim Kohn
The tissue microenvironment has profound effects on tissue-specific regeneration. The 3-dimensional extracellular matrix (ECM) niche influences the linage-specific differentiation of stem cells in tissue. To understand how ECM guides tissue-specific regeneration, we established a series of 3D composite scaffolds containing ECMs derived from different primary cells isolated from a single animal species and assessed their impact on the differentiation of human mesenchymal stem cells (hMSCs). Synthetic microfiber scaffolds (fiber mats) were fabricated by electrospinning tyrosine-derived polycarbonates (pDTEC)...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28532125/colorimetric-humidity-sensors-based-on-electrospun-polyamide-cocl2-nanofibrous-membranes
#14
Ming-Hao You, Xu Yan, Jun Zhang, Xiao-Xiong Wang, Xiao-Xiao He, Miao Yu, Xin Ning, Yun-Ze Long
Humidity indicators based on composite polyamide 66/cobalt chloride (PA66/CoCl2) nanofibrous membranes (NFMs) were successfully fabricated by electrospinning. A series of NFMs with various weight percentage of CoCl2 to PA66 were prepared, and their humidity sensitivity based on color changing and quartz crystal microbalance (QCM) were studied. Due to the color change property of cobalt chloride, the as-spun composite NFMs show obviously macroscopic color change from blue to pink as relative humidity (RH) increasing from 12...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28532105/additive-manufacturing-with-polypropylene-microfibers
#15
Jodie N Haigh, Tim R Dargaville, Paul D Dalton
The additive manufacturing of small diameter polypropylene microfibers is described, achieved using a technique termed melt electrospinning writing. Sequential fiber layering, which is important for accurate three-dimensional fabrication, was achieved with the smallest fiber diameter of 16.4±0.2μm obtained. The collector speed, temperature and melt flow rate to the nozzle were optimized for quality and minimal fiber pulsing. Of particular importance to the success of this method is appropriate heating of the collector plate, so that the electrostatically drawn filament adheres during the direct-writing process...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532057/electrospun-polymer-scaffolds-modified-with-drugs-for-tissue-engineering
#16
Izabella Rajzer, Elżbieta Menaszek, Oscar Castano
The purpose of this paper was to fabricate nanofibrous scaffolds containing ossein-hydroxyapatite complex (osteogenon) to mimic the native bone extracellular matrix. Polylactide (PLDL) and polycaprolactone (PCL) were used to prepare scaffolds using electrospinning. Unfortunately, both of these biodegradable polymers have poor cell recognition sites leading to poor cell affinity and adhesion, therefore, based on our previous experience, osteogenon-drug was used at the stage of fibers forming by electrospinning...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532036/facile-fabrication-of-pan-pdms-core-shell-nanofibers-from-synchronous-photopolymerization
#17
Qijian Niu, Xiaolei Zhu, Yunhui Tang, Jun Nie, Guiping Ma
Different from the traditional method for fabricating core-shell structure nanofiber, the PAN/PDMS nanofibers with core-shell structure (PAN as the core layer and PDMS as the shell layer) have been illustrated, which combines with the synchronous photopolymerization during emulsion electrospinning process. The morphology and structure of as-fabricated PAN/PDMS nanofibers are characterized by SEM and TEM. The composition of PAN/PDMS nanofibers is characterized by FTIR, XPS, TG, and DTG, successfully. The photopolymerization process is characterized by UV-vis spectroscopy indirectly...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532029/surfactin-loaded-polyvinyl-alcohol-pva-nanofibers-alters-adhesion-of-listeria-monocytogenes-to-polystyrene
#18
J J Ahire, D D Robertson, A J van Reenen, L M T Dicks
Surfactin-loaded polyvinyl alcohol (PVA) nanofibers were spun using gravity electrospinning. Scanning electron microscopy (SEM) images showed that nanofibers spun with surfactin are free from bead formation and uniform in diameter. The average nanofiber diameters were decreased (273±39nm, 259±39nm and 217±33nm) with increasing levels of surfactin (0.5, 1.0 and 1.5%, w/v) into PVA (10%, w/v). The 10% (w/v) PVA had average fiber diameter of 303±33nm. Atomic force microscopy (AFM) analysis showed that fibers spun with surfactin are not smooth as PVA fibers...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531987/electrospinning-of-thermoplastic-carboxymethyl-cellulose-poly-ethylene-oxide-nanofibers-for-use-in-drug-release-systems
#19
Akbar Esmaeili, Mahsa Haseli
Polymeric delivery systems using electrospun nanofibers have been developed for many applications, notably for drug delivery and tissue engineering in the healthcare industry. In this study, a nanofiber drug carrier was fabricated via two different electrospinning processes, blend and coaxial, using a new degradable thermoplastic carboxymethyl cellulose (TCMC) and poly(ethylene oxide) (PEO). The TCMC was synthesized by graft copolymerization with methyl acrylate. Tetracycline hydrochloride served as a drug model incorporated within these nanofibers and their performance as a drug-carrier scaffold was evaluated...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28528953/composite-poly-lactic-acid-chitosan-nanofibrous-scaffolds-for-cardiac-tissue-engineering
#20
Yaowen Liu, Shuyao Wang, Rong Zhang
Fibrous scaffolds with different ratios of poly (lactic acid) (PLA) and chitosan were fabricated by conventional electrospinning. After crosslinking by the glutaraldehyde vapor, the structure, mechanical properties, hydrophilicity, and in-fiber chemical interactions of the scaffolds were investigated. We found that the fiber diameter decreased with the concentration of chitosan, while mechanical properties and hydrophilicity improved. In addition, we found that scaffolds with aligned fibers have higher mechanical strength and biocompatibility than scaffolds with randomly oriented fibers...
May 18, 2017: International Journal of Biological Macromolecules
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