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Jessica H Brown, Prativa Das, Michael D DiVito, David Ivancic, Lay Poh Tan, Jason A Wertheim
A major challenge of maintaining primary hepatocytes in vitro is progressive loss of hepatocyte-specific functions, such as protein synthesis and cytochrome P450 (CYP450) catalytic activity. We developed a three-dimensional (3D) nanofibrous scaffold made from poly(L-lactide-co-glycolide) (PLGA) polymer using a newlyoptimizedwet electrospinning techniquethat resulted in a highly porous structure that accommodated inclusion of primary human hepatocytes. Extracellular matrix (ECM) proteins (type I collagen or fibronectin) at varying concentrations were chemically linked to electrospun PLGA using amine coupling to develop an in vitro culture system containing the minimal essential ECM components of the liver micro-environment that preserve hepatocyte function in vitro...
February 14, 2018: Acta Biomaterialia
Andrea Fotticchia, Emrah Demirci, Cristina Lenardi, Y Liu
There is lack of investigation capturing the complex mechanical interaction of tissue engineered IVD (intervertebral disc) constructs in physiologically-relevant environmental conditions. In this study, mechanical characterisation of anisotropic eletrospinning (ES) substrates made of polycaprolactone (PCL) was carried out in wet and dry conditions and viability of human bone marrow derived mesenchymal stem cells (hMSCs) seeded within double layers of ES PCL was also studied. Cyclic compression of IVD-like constructs composed of an agarose core confined by ES PCL double-layers was implemented using a bioreactor and the cellular response to the mechanical stimulation was evaluated...
February 14, 2018: Journal of Biomechanical Engineering
Zhenhua Yang, Maria Moffa, Ying Liu, Hongfei Li, Luana Persano, Andrea Camposeo, Rosalba Saija, Maria Antonia Iatì, Onofrio M Maragò, Dario Pisignano, Chang-Yong Nam, Eyal Zussman, Miriam Rafailovich
Hybrid conjugated polymer/fullerene filaments based on MEH-PPV/PVP/PCBM were prepared by electrospinning, and their properties were assessed by scanning electron, atomic and lateral-force, tunneling, and confocal microscopies, as well as by attenuated-total-reflection Fourier transform infrared spectroscopy, photoluminescence quantum yield, and spatially resolved fluorescence. Highlighted features include the ribbon shape of the realized fibers and the persistence of a network serving as a template for heterogeneous active layers in solar cell devices...
February 8, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Min Hyeok Kim, Woo Jin Lee, Do Hee Lee, Sung Won Ko, Tae In Hwang, Jin Woo Kim, Chan Hee Park, Cheol Sang Kim
Recently, numerous researchers are interested in the development of new air filter because of air pollution caused by rapid industrialization and urbanization. The major concerns in developing air filters are: pressure drop and filtration efficiency which are considered significant. As the pressure drop increases, the energy consumption becomes high. In this study, we developed a novel air filter (polyurethane fiber mat) for nano size filtration using a mass production electrospinning, which is expected to enhance filtration efficiency and pressure drop effects...
March 1, 2018: Journal of Nanoscience and Nanotechnology
S Uma Maheshwari, K Govindan, M Raja, A Raja, M B S Pravin, S Vasanth Kumar
β Tricalcium phosphate ceramic was used to reinforce nanofibers in composite mats produced via electrospinning of poly(vinyl alcohol) (PVA), polycaprolactone (PCL) and (PVA: PCL) bilayers. The role of TCP ceramic on morphology of nanocomposites, crystalline structure, functional groups and thermal behaviour of nanocomposites were characterized by SEM, EDAX, XRD, FTIR and DSC analysis. Ultrathin cross-sections of the obtained nanocomposites were morphologically investigated with SEM and all fabricated composites consisted of fibers with average fiber diameter (AFD) around 100 nm except PCL-TCP fibers having AFD in the range of 608 nm...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Carla Marega, Roberta Saini
Conductive polymer blends of polypyrrole (PPy) and poly(ethylene oxide) (PEO) were obtained in the form of films and fibers, respectively by solvent casting and electrospinning. Different amounts of PPy were introduced in the blends in order to study the effect of the conductive polymer on the properties of the final material and in particular to elucidate the influence of the different morphology on conductivity. The structure and morphology of PPy/PEO blends were characterized by wide angle X-ray diffraction (WAXD) and small angle X-ray scattering (SAXS), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to understand the influence of different PPy content on thermal behavior and stability, electrospun fibrous mats were examined by scanning electron microscopy (SEM)...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Mohamed H El-Newehy, Mehrez E El-Naggar, Saleh Alotaiby, Hany El-Hamshary, Meera Moydeen, Salem Al-Deyab
Electrospun nanofibers mats are green synthesized using hydroxypropyl cellulose (HPC) individually or in conjugation with either poly(vinyl alcohol) (PVA) or Polyvinylpyrrolidone (PVP) to enhance the mechanical properties of the nanofibers mats. Desirable attributes of the as-obtained nanofibers mats are manifested via using SEM, FT-IR, TGA and conventional tools for mechanical and physical properties. The obtained data from SEM images demonstrated that the diclofenac sodium (DS) loaded nanofibers mats did not provide significant change of the morphological structure to the mats...
February 1, 2018: Journal of Nanoscience and Nanotechnology
N Kaerkitcha, T Sagawa
Nanofibers with the cationic fluorescent molecules, 1-pyrenemethylamine hydrochloride (PyrMA) and α,β,γ,δ-tetrakis(1-methylpyridinium-4-yl)porphyrin p-toluenesulfonate (TMPyP), in the presence of complementary anionic chiral polysaccharide, hyaluronic acid (HA) and transparent polymer, polyethylene oxide (PEO) were successfully prepared using an electrospinning technique. The results showed that the fluorescence spectra of electrospun nanofibers (ENFs) of PEO-HA-PyrMA exhibit a higher amount of pyrene excimer emission when the [PyrMA]/[HA] ratio was increased from 0...
February 15, 2018: Photochemical & Photobiological Sciences
Ayman Yousef, Robert M Brooks, Ahmed Abutaleb, Salem S Al-Deyab, Mohamed H El-Newehy
Electrospinning has been used to synthesize cobalt-chromium carbide nanoparticles (NPs)-doped carbon nanofibers (CNFs) (Composite). Electrospun mat comprising of cobalt acetate, chromium acetate and poly(vinyl alcohol) (PVA) has been carbonized at low temperature (850 °C) for 3 h under argon atmosphere to produce the introduced composite. The process was achieved at low temperature due to the presence of cobalt as an activator. Field emission scanning electron microscope (FE-SEM), X-ray diffractometry (XRD), and transmission electron microscopy (TEM) equipped with EDX techniques were used to determine the products characteristics...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Melike Gozutok, Ahmet Ozan Basar, Hilal Turkoglu Sasmazel
In this study, a natural antibacterial substance chitosan was coated with/without potassium sorbate (KS) (0.8% (w/w) of KS, 8% (w/v) chitosan) onto the polypropylene (PP) film by using electrospinning technique to obtain novel antibacterial composite materials for various applications such as wound dressing, tissue engineering, drug delivery and food packaging. Atmospheric pressure plasma surface treatment was applied onto polypropylene films in order to increase its wettability thus enhancing the adhesion capacity of the films and the optimum CA value was determined as 42...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Tao Dong, Yunshi Liu, Debao Liu, Ping Yang
One dimensional (1D) NiFe2O4 nanofibers have been successfully fabricated using single-nozzle electrospinning technique and subsequent calcination process through adjusting heat-treatment parameters. The calcination procedure plays a key role for the formation of nanofibers with different morphologies. The lithium storage properties of NiFe2O4 nanofibers were evaluated by galvanostatic cycling studies in half-cell configuration. Furthermore, their photocatalytic property under vis-light irradiation with H2O2 addition is investigated at room temperature...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Xiaofei Song, Yibing Cai, Cong Huang, Ying Gu, Junhao Zhang, Hui Qiao, Qufu Wei
A novel form-stable phase change materials (FSPCMs) was fabricated by incorporating fatty acid eutectics with electrospun carbon nanofibers (CNFs) surface-attached with copper (Cu) nanoparticles. Three different Cu/CNFs mats were made through combining the technique and principle of electrospinning, pre-oxidation/carbonization and in-situ reduction, while lauric-myristic-stearic acid (LA-MA-SA) ternary eutectic mixture was prepared as the model PCM. The morphology and crystal structure of Cu/CNFs were characterized by Fourier transfer infrared (FT-IR) spectra, Scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray energy dispersive spectroscopy (EDS), respectively...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Zhiying Wang, He Shen, Saijie Song, Liming Zhang, Wei Chen, Jianwu Dai, Zhijun Zhang
Delivery of functional genes into stem cells shows great application prospect in DNA-based tissue engineering. However, comparing with epithelial cells and cancer cells, stem cells usually exhibit low gene transfection efficiency. To enhance the transfection efficiency, non-viral gene delivery in combination with biomaterial scaffolds, has raised increasing interests from researchers in tissue engineering. Nanofibers fabricated by electrospinning technique mimicking extracellular matrix (ECM) are widely used in tissue engineering applications...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Da-Ming Ren, Hua-Kun Huang, Yun Yu, Zeng-Tian Li, Li-Wang Jiang, Shui-Mei Chen, Kwok-Ho Lam, Bo Lin, Bo Shi, Fu-An He, Hui-Jun Wu
Nanofibrous silver (Ag)/poly(vinylidene fluoride) (PVDF) composite membranes were obtained from a two-step preparation method. In the first step, the electrospun silver nitrate (AgNO3)/PVDF membranes were prepared and the influence of the AgNO3 content on the electrospinning process was studied. According to scanning electron microscopy (SEM) results, when the electrospinning solution contained AgNO3 in the range between 3 to 7 wt.%, the nanofiber morphologies can be obtained. In the second step, the electrospun AgNO3/PVDF membranes were reduced by sodium borohydride to form the nanofibrous Ag/PVDF composite membranes...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Tao Wang, Yu Zhang, Yong Wang, Jinxin Wei, Ming Zhou, Zhengmei Zhang, Qi Chen
A gold doped titanium dioxide (TiO2) nanofiber was prepared by one-step electrospinning technique to control the DC high voltage and the following calcination. The crystal structures and morphology of Au-TiO2 nanofibers were characterized in detail by X-ray diffraction (XRD), energy dispersive photoelectron spectroscopy (EDS), scanning electron microscope (SEM) and transmission electron microscope (TEM). These results indicate that Au is successfully incorporated into TiO2 nanofibers without gold loss, while Au and TiO2 form a heterogeneous structure...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Tao Yan, Zhi-Juan Pan
In this paper, polyacrylonitrile/graphene composite nanofiber filaments were manufactured continuously by a homemade eight-needle electrospinning device with an auxiliary electrode. The polyacrylonitrile/graphene composite nanofiber yarns were obtained continuously by plying and twisting the composite nanofiber filaments. The structures and properties of the composite nanofiber filaments with different GP mass fractions and yarns were investigated. The results demonstrated that the maximum alignment degree of the composite nanofibers along the filament axis could reach 74...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Li-Li Chen, Xiang-Qian Shen, Mao-Xiang Jing, Sheng-Wen Zhu, Zhi-Chao Pi, Jing-Quan Li, Hong-Ai Zhai, Ke-Song Xiao
A LiFePO4/C composite fiber membrane was fabricated by the electrospinning method and subsequent thermal treatment. The thermal decomposition process was analyzed by TG/DSC, the morphology, microstructure and composition were studied using SEM, TEM, XRD, Raman, respectively. The results indicated that the prepared LiFePO4/C composite fibers were composed of nanosized LiFePO4 crystals and amorphous carbon coatings, which formed a three dimensional (3D) long-range networks, greatly enhanced the electronic conductivity of LiFePO4 electrode up to 3...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Abdullah M Al-Enizi, Robert M Brooks, M M Ahmad, M M El-Halwany, Mohamed H El-Newehy, Ayman Yousef
Co0 nanoparticles supported on TiO2 nanofibers (nanocomposite) were prepared using a simple electrospinning technique and In-Situ chemical reduction. The synthesized nanocomposite was used to generate hydrogen from ammonia borane (AB). Standard characterization techniques revealed dense distribution of Co0 nanoparticles (Co NPs) onto the TiO2 nanofibers (TiO2 NFs) in the prepared nanocomposite. The introduced nanocomposite has been showed a good catalytic activity as compared to those unsupported Co NPs. As, the hydrogen evolutions for the nanocomposite and Co NPs were 3 mol in 23 min and 47 min, respectively...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Siqi Huan, Guoxiang Liu, Guangping Han, Long Bai
Uniform PLA/CNC nanofibrous mats composed of either random or aligned fibers reinforced with up to 20 wt% cellulose nanocrystals (CNCs) were successfully produced by two different electrospinning processes. Various concentrations of CNCs could be stably dispersed in PLA solution prior to nanofiber manufacture. The microstructure of produced fibrous mats, regardless of random or aligned orientation, was transformed from smooth to nanoporous surface by changing CNC loading levels. Aligning process through secondary stretching during high-speed collecting can also affect the porous structure of fibers...
February 14, 2018: Biomacromolecules
Sarah Shafaat, Naside Mangir, Sabiniano R Regureos, Christopher R Chapple, Sheila MacNeil
AIMS: Pelvic organ prolapse and stress urinary incontinence affect 40-50% of postmenopausal women worldwide. Polypropylene meshes have been extensively used for the surgical intervention of these disorders; however, these meshes can lead to severe complications in some patients. The need for synthetic materials more suited for use in pelvic floor repair is widely accepted. This study aims to develop an electrospun 17-β-estradiol releasing polyurethane (PU) scaffold that not only provides the appropriate mechanical support but can also stimulate new extracellular matrix (ECM) production and angiogenesis...
February 13, 2018: Neurourology and Urodynamics
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