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https://www.readbyqxmd.com/read/29331927/honeycomb-like-polysulphone-polyurethane-nanofiber-filter-for-the-removal-of-organic-inorganic-species-from-air-streams
#1
Xin Chen, Yang Xu, Meimei Liang, Qinfei Ke, Yuanyuan Fang, He Xu, Xiangyu Jin, Chen Huang
Nanofiber nonwoven filters, especially those prepared by electrospinning, are of particular interest because of their high filtration efficiency. However, existing electrospun filters suffer from inherent limitations in that both strengths and filtration resistances of the filters leave much to be desired. Herein, we present a novel nonwoven filter that is composed of polysulphone and polyurethane nanofibers. By mimicking the honeycomb structure, a heterogeneous distribution of both fiber diameter and fiber density has been achieved...
January 8, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29331580/local-delivery-of-mometasone-furoate-from-an-eluting-endotracheal-tube
#2
Abu Ammar Aiman, Maayan Gruber, Patrick Martin, Ohad Stern, Forsan Jahshan, Offir Ertracht, Eyal Sela, Samer Srouji, Eyal Zussman
Laryngeal and tracheal morbidity is a common complication of endotracheal tube (ETT)-based airway management, and manifests as local irritation, inflammation, and edema. Systemic corticosteroids are commonly administered to manage these conditions; however, their efficacy is inadequate and limited by potential severe side effects. In the present study, a steroid delivery system for local therapy was developed to generate relatively high local drug concentrations and to improve drug efficacy. ETTs were coated with electrospun poly (lactic-co-glycolic acid) (PLGA) nanofibers loaded with mometasone furoate (MF), creating a microscale thick layer...
January 10, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29329076/attachment-of-nanoparticulate-drug-release-systems-on-poly-%C3%AE%C2%B5-caprolactone-nanofibers-via-a-graftpolymer-as-interlayer
#3
Dominik de Cassan, Steffen Sydow, Nadeschda Schmidt, Peter Behrens, Yvonne Roger, Andrea Hoffmann, Anna Lena Hoheisel, Birgit Glasmacher, Robert Hänsch, Henning Menzel
Electrospun poly(ε-caprolactone) (PCL) fiber mats are modified using a chitosan grafted with PCL (CS-g-PCL), to improve the biological performance and to enable further modifications. The graft copolymer is immobilized by the crystallization of the PCL grafts on the PCL fiber surface as binding mechanism. In this way, the surface of the fibers is covered with chitosan bearing cationic amino groups, which allow adsorption of oppositely charged nanoparticulate drug-delivery systems. The modification of the fiber mats and the attachment of the drug delivery systems are easy and scalable dip processes...
December 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29328651/enzymatic-cleavage-of-branched-peptides-for-targeting-mitochondria
#4
Hongjian He, Jiaqing Wang, Huaimin Wang, Ning Zhou, Dongsik Yang, Douglas R Green, Bing Xu
Most of the reported mitochondria targeting molecules are lipophilic and cationic, which may become cytotoxic with accumulation. Here we show enzymatic cleavage of branched peptides that carry negative charges for targeting mitochondria. Conjugating a well-established protein tag (i.e., FLAG-tag) to self-assembling motifs affords the pre-cursors that form micelles. Enzymatic cleavage of the hydrophilic FLAG motif (DDDDK) by enterokinase (ENTK) turns the micelles to nanofibers. After being taken up by cells, the micelles, upon the action of intracellular ENTK, turns into nanofibers to locate mainly at mitochondria...
January 12, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29327486/ir-driven-ultrafast-transfer-of-plasmonic-hot-electrons-in-nonmetallic-branched-heterostructures-for-enhanced-h2-generation
#5
Zhenyi Zhang, Xiaoyi Jiang, Benkang Liu, Lijiao Guo, Na Lu, Li Wang, Jindou Huang, Kuichao Liu, Bin Dong
The ultrafast transfer of plasmon-induced hot electrons is considered an effective kinetics process to enhance the photoconversion efficiencies of semiconductors through strong localized surface plasmon resonance (LSPR) of plasmonic nanostructures. Although this classical sensitization approach is widely used in noble-metal-semiconductor systems, it remains unclear in nonmetallic plasmonic heterostructures. Here, by combining ultrafast transient absorption spectroscopy with theoretical simulations, IR-driven transfer of plasmon-induced hot electron in a nonmetallic branched heterostructure is demonstrated, which is fabricated through solvothermal growth of plasmonic W18 O49 nanowires (as branches) onto TiO2 electrospun nanofibers (as backbones)...
January 12, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29327436/effect-of-patterned-electrospun-hierarchical-structures-on-alignment-and-differentiation-of-mesenchymal-stem-cells-biomimicking-bone
#6
Sharanya Sankar, Manohar Kakunuri, Sindhuja D E, Chandra S Sharma, Subha N Rath
Considering the complex hierarchical structure of bone, biomimicking the micro and nano level features should be an integral part of scaffold fabrication for successful bone regeneration. We aim to biomimic the micro- and nano-structure of bone and study the effect of physical cues on cell alignment, proliferation and differentiation. To achieve this, we have divided the scaffolds into groups: electrospun SU-8 nanofibers, electrospun SU-8 nanofibers with UV treatment and micropatterned (20 μm sized ridges and grooves) SU-8 nanofibers by photolithography with UV treatment...
January 11, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29327429/in-vivo-migration-of-endogenous-brain-progenitor-cells-guided-by-an-injectable-peptide-amphiphile-biomaterial
#7
Reza Motalleb, Eric J Berns, Piyush Patel, Julie Gold, Samuel I Stupp, H Georg Kuhn
Biomaterials hold great promise in helping the adult brain regenerate and rebuild after trauma. Peptide amphiphiles (PA) are highly versatile biomaterials, gelling and forming macromolecular structures when exposed to physiological levels of electrolytes. We are here reporting on the first ever in vivo use of self-assembling peptide amphiphile carrying a Tenascin-C signal (E2 Ten-C PA) for the re-direction of endogenous neuroblasts in the rodent brain. The PA forms highly aligned nanofibers, displaying the migratory sequence of Tenascin-C glycoprotein as epitope...
January 12, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29325204/a-transformable-chimeric-peptide-for-cell-encapsulation-to-overcome-multidrug-resistance
#8
Chi Zhang, Li-Han Liu, Wen-Xiu Qiu, Yao-Hui Zhang, Wen Song, Lu Zhang, Shi-Bo Wang, Xian-Zheng Zhang
Multidrug resistance (MDR) remains one of the biggest obstacles in chemotherapy of tumor mainly due to P-glycoprotein (P-gp)-mediated drug efflux. Here, a transformable chimeric peptide is designed to target and self-assemble on cell membrane for encapsulating cells and overcoming tumor MDR. This chimeric peptide (C16 -K(TPE)-GGGH-GFLGK-PEG8 , denoted as CTGP) with cathepsin B-responsive and cell membrane-targeting abilities can self-assemble into nanomicelles and further encapsulate the therapeutic agent doxorubicin (termed as CTGP@DOX)...
January 11, 2018: Small
https://www.readbyqxmd.com/read/29323229/facile-synthesis-of-tio2-zro2-nanofibers-nitrogen-co-doped-activated-carbon-to-enhance-the-desalination-and-bacterial-inactivation-via-capacitive-deionization
#9
Ahmed S Yasin, Ibrahim M A Mohamed, Hamouda M Mousa, Chan Hee Park, Cheol Sang Kim
Capacitive deionization, as a second generation electrosorption technique to obtain water, is one of the most promising water desalination technologies. Yet; in order to achieve high CDI performance, a well-designed structure of the electrode materials is needed, and is in high demand. Here, a novel composite nitrogen-TiO2/ZrO2 nanofibers incorporated activated carbon (NACTZ) is synthesized for the first time with enhanced desalination efficiency as well as disinfection performance towards brackish water. Nitrogen and TiO2/ZrO2 nanofibers are used as the support of activated carbon to improve its low capacitance and hydrophobicity, which had dramatically limited its adequacy during the CDI process...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29322141/polydiacetylenic-nanofibers-as-new-sirna-vehicles-for-in-vitro-and-in-vivo-delivery
#10
P Neuberg, I Hamaidi, S Danilin, M Ripoll, V Lindner, M Nothisen, A Wagner, A Kichler, T Massfelder, J-S Remy
Polydiacetylenic nanofibers (PDA-Nfs) obtained by photopolymerization of surfactant 1 were optimized for intracellular delivery of small interfering RNAs (siRNAs). PDA-Nfs/siRNA complexes efficiently silenced the oncogene Lim-1 in the renal cancer cells 786-O in vitro. Intraperitoneal injection of PDA-Nfs/siLim1 downregulated Lim-1 in subcutaneous tumor xenografts obtained with 786-O cells in nude mice. Thus, PDA-Nfs represent an innovative system for in vivo delivery of siRNAs.
January 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/29320855/sensitive-detection-of-a-nerve-agent-simulant-through-retightening-internanofiber-binding-for-fluorescence-enhancement
#11
Xiaoling Liu, Yanjun Gong, Yingxuan Zheng, Wei Xiong, Chen Wang, Tie Wang, Yanke Che, Jincai Zhao
In this work, we develop fluorescent hierarchical nanofiber bundles 1, which involve the internanofiber hydrogen-bonding interactions, for rapid and sensitive detection of DCP vapor. First, the internanofiber hydrogen-bonding strength can be weakened by photoexcitation, which thereby increases the internanofiber spacing and decreases the fluorescence intensity. Then, when exposed to trace DCP vapor, the strong interactions between DCP and hydroxyl groups on the nanofibers can effectively retighten the nanofibers and enhance the fluorescence as the detection signal...
January 11, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29320722/biodegradation-and-ecotoxicological-impact-of-celluose-nanocomposites-in-municipal-solid-waste-composting
#12
Shoboo Salehpour, Mehdi Jonoobi, Masoud Ahmadzadeh, Valentina Siracusa, Fatemeh Rafieian, Kristiina Oksman
Biodegradable nanocomposites were prepared from polyvinyl alcohol (PVA) and cellulose nanofiber (CNF) by using liquid nitrogen, freeze drying and hot press techniques. The effect of CNF content on the biodegradability of the films was investigated by visual observation, scanning electron microscopy (SEM), weight loss, CO2 evolution, differential scanning calorimetry, measuring the amount of mineralized carbon of the specimens buried in municipal solid waste. Ecotoxicity was evaluated by plants growth tests with cress and spinach...
January 7, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29319080/process-morphology-scaling-relations-quantify-self-organization-in-capillary-densified-nanofiber-arrays
#13
Ashley L Kaiser, Itai Y Stein, Kehang Cui, Brian L Wardle
Capillary-mediated densification is an inexpensive and versatile approach to tune the application-specific properties and packing morphology of bulk nanofiber (NF) arrays, such as aligned carbon nanotubes. While NF length governs elasto-capillary self-assembly, the geometry of cellular patterns formed by capillary densified NFs cannot be precisely predicted by existing theories. This originates from the recently quantified orders of magnitude lower than expected NF array effective axial elastic modulus (E), and here we show via parametric experimentation and modeling that E determines the width, area, and wall thickness of the resulting cellular pattern...
January 10, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29316144/quantitative-comparison-of-enzyme-immobilization-strategies-for-glucose-biosensing-in-real-time-using-fast-scan-cyclic-voltammetry-coupled-with-carbon-fiber-microelectrodes
#14
Samantha K Smith, Leyda Z Lugo-Morales, Christina Tang, Saahj P Gosrani, Christie A Lee, James G Roberts, Stephen W Morton, Gregory S McCarty, Saad A Khan, Leslie A Sombers
Electrochemical monitoring of non-electroactive species requires a biosensor that is stable and selective, with sensitivity to physiological concentrations of targeted analytes. We have combined glucose oxidase-modified carbon-fiber microelectrodes with fast-scan cyclic voltammetry for real-time measurements of glucose fluctuations in brain tissue. Work presented herein quantitatively compares three approaches to enzyme immobilization on the microelectrode surface - physical adsorption, hydrogel entrapment, and entrapment in electrospun nanofibers...
January 9, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29314760/preparation-of-an-injectable-doxorubicin-surface-modified-cellulose-nanofiber-gel-and-evaluation-of-its-anti-tumor-and-anti-metastasis-activity-in-melanoma
#15
Najmeh Alizadeh, Vajihe Akbari, Maryam Nurani, Azade Taheri
Cellulose nanofibers (Cel-NFs) gel can be considered as a useful drug carrier because of its biocompatibility, high specific surface area and high loading capacity of drugs. Injectable Cel-NFs gel could deliver doxorubicin (DOX) for localized chemotherapy of melanoma and suppress melanoma cells migration because of the physical barrier property of Cel-NFs. We prepared DOX surface modified Cel-NFs (DOX-Cel-NFs) gel by the electrostatic attachment of DOX molecules on the surface of Cel-NFs. The increase in the zeta potential of nanofibers and the changes in the FTIR spectra of DOX-Cel-NFs compared to Cel-NFs proved this attachment...
January 5, 2018: Biotechnology Progress
https://www.readbyqxmd.com/read/29314595/fabrication-and-characterization-of-polymer-ceramic-nanocomposites-containing-drug-loaded-modified-halloysite-nanotubes
#16
Maedeh Ghaderi-Ghahfarrokhi, Vahid Haddadi-Asl, Seyed Shahrooz Zargarian
Modified halloysite nanotubes (HNT-NH2 and HNT-COOH) were synthesized by a coupling reaction with 3-amino- propyltriethoxysilane (APTES) and maleic anhydride from hydroxyl groups of neat halloysite nanotubes (HNTs). Successful attachment of functional groups onto HNTs was evaluated by FTIR and TGA. XRD was used to study the crystalline structure of scaffolds and the formation of intercalated structure as a result of improved dispersion and decreased agglomeration of modified nanoparticles. Neat HNT, HNT-NH2 and HNT-COOH were subsequently introduced into Polycaprolactone/Pluronic P123 (PCL/P123) electrospun substrate...
January 3, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29307070/polyaniline-based-adsorbents-for-removal-of-hexavalent-chromium-from-aqueous-solution-a-mini-review
#17
Yilin Jiang, Zhifeng Liu, Guangming Zeng, Yujie Liu, Binbin Shao, Zhigang Li, Yang Liu, Wei Zhang, Qingyun He
Hexavalent chromium (Cr(VI)) is a common hazardous contaminant in the environment and carcinogenic or mutagenic to aquatic animals and human beings. Therefore, the removal and detoxification of Cr(VI) have been attracting increasing attention of researchers. Among various conducting polymers, polyaniline (PANI)-based adsorbents have shown an excellent performance on the removal of Cr(VI) because of their redox properties, eased synthesis, and favorable biocompatibility. In this review, the characteristics of various PANI-based adsorbents were described, including PANI-modified nanofiber mats and membranes, PANI/bio-adsorbents, PANI/magnetic adsorbents, PANI/carbon adsorbents, PANI-modified clay composites, and PANI-inorganic hybrid composites...
January 6, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29306158/pore-engineering-towards-highly-efficient-electrospun-nanofibrous-membranes-for-aerosol-particle-removal
#18
Riyadh Al-Attabi, Ludovic F Dumée, Jürg A Schütz, Yosry Morsi
Electrospun nanofibrous membranes were engineered for aerosol particle removal by controlling the fiber density and alignment across electrospun mats. Electrospun nanofiber membranes were deposited on both, rotatory drum and stationary collectors, to investigate the effect of fiber alignment on filtration performance. Poly(acrylonitrile)/dimethyl formamide (PAN/DMF) solutions were used to produce membranes for applications in air purification. The air filtration performance of as-produced and hot-compacted membranes were systematically evaluated with regard to penetration, pressure drop, and quality factor when subjected to potassium chloride (KCl) aerosol particles in the size-range of 300nm to 12μm...
January 3, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29304449/rapid-removal-of-radioactive-cesium-by-polyacrylonitrile-nanofibers-containing-prussian-blue
#19
Hyuncheol Kim, Minsun Kim, Wanno Lee, Soonhyun Kim
After the Fukushima Daiichi Nuclear Power Plant disaster in Japan in 2011, the demand drastically increased for efficient technology for the removal of radioactive cesium. Prussian blue (PB) nanoparticles have shown excellent adsorption ability toward Cs. In this study, we synthesized PB nanoparticles incorporated polyacrylonitrile nanofiber (PB/PAN). PB/PAN has the porous structure of nanofibers, with diameters of several hundred nanometers. PB nanoparticles can be incorporated successfully into the PAN matrix without any change to their intrinsic crystallinity and structure...
December 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29303206/self-assembly-pathways-and-polymorphism-in-peptide-based-nanostructures
#20
Nikola A Dudukovic, Benjamin C Hudson, Anant K Paravastu, Charles F Zukoski
Dipeptide derivative molecules can self-assemble into space-filling nanofiber networks at low volume fractions (<1%), allowing the formation of molecular gels with tunable mechanical properties. The self-assembly of dipeptide-based molecules is reminiscent of pathological amyloid fibril formation by naturally occurring polypeptides. Fluorenylmethoxycarbonyl-diphenylalanine (Fmoc-FF) is the most widely studied such molecule, but the thermodynamic and kinetic phenomena giving rise to Fmoc-FF gel formation remain poorly understood...
January 5, 2018: Nanoscale
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