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https://www.readbyqxmd.com/read/28821138/biocompatible-chitin-carbon-nanotubes-composite-hydrogels-as-neuronal-growth-substrates
#1
Shuangquan Wu, Bo Duan, Ang Lu, Yanfeng Wang, Qifa Ye, Lina Zhang
In the past decades, extensive studies have demonstrated that carbon nanotubes (CNTs) could promote cell adhesion, proliferation and differentiation of neuronal cells. However, the potential cytotoxicity in biological systems severely restricted the utilization of CNTs as substrates for neural growth. In this study, biocompatible chitin/carbon nanotubes (Ch/CNT) composite hydrogels were developed via blending modified CNTs with chitin solution in 11wt% NaOH/4wt% urea aqueous system, and subsequently regenerating in ethanol...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821128/biomimetic-composite-scaffolds-based-on-surface-modification-of-polydopamine-on-electrospun-poly-lactic-acid-cellulose-nanofibrils
#2
Zhangqiang Yang, Junhui Si, Zhixiang Cui, Jianhua Ye, Xiaofeng Wang, Qianting Wang, Kaiping Peng, Wenzhe Chen, Shia-Chung Chen
An appropriate surface chemical property is crucial in tissue engineering scaffolds, which promotes cell attachment and proliferation. A biomimetic composite scaffold with a polydopamine (PDA) coating layer on electrospun poly(lactic acid) (PLA)/cellulose nanofibrils (CNF) composite nanofiber was developed in this study. PLA/CNF composite nanofibers were fabricated and then coated via treatment with a dopamine solution. The PDA coating layer was successfully formed on the surface of the PLA/CNF composite nanofiber by using a simple, environment-friendly, and effective procedure...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821109/pectinate-nanofiber-mat-with-high-absorbency-and-antibacterial-activity-a-potential-superior-wound-dressing-to-alginate-and-chitosan-nanofiber-mats
#3
Sainan Chen, Sisi Cui, Junli Hu, Yifa Zhou, Yichun Liu
Polysaccharides including pectin, alginate and chitosan are fabricated into dressings of micrometer-scaled architecture (micro- fiber or particle) and widely applied in wound treatments clinically. This work characterized and compared the properties of electrospun nanofibrous dressings of these polysaccharides. We found that although the three polysaccharide nanofiber mats had comparable mechanical strength and vapour permeability, the pectinate nanofiber mat could absorb 1.2 times and 3.6 times more exudates than the alginate and chitosan nanofiber mats, respectively, within less time...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821090/dyeing-and-characterization-of-regenerated-cellulose-nanofibers-with-vat-dyes
#4
Muzamil Khatri, Farooq Ahmed, Irfan Shaikh, Duy-Nam Phan, Qamar Khan, Zeeshan Khatri, Hoik Lee, Ick Soo Kim
Recent advancement in dyeing of nanofibers has been accelerated to improve their aesthetic properties, however, achieving good color fastness remains a challenge. Therefore, we attempt to improve the color fastness properties nanofibers. Vat dyes are known for better color fastness and their application on nanofibers has not been investigated to date. Herein, we report dyeing of regenerated cellulose nanofibers (RCNF) that were produced from precursor of cellulose acetate (CA) followed by deacetylation process...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821075/rapid-fabrication-of-transparent-film-directly-from-wood-fibers-with-microwave-assisted-ionic-liquids-technology
#5
Pengbo Lu, Fan Cheng, Yanghao Ou, Meiyan Lin, Lingfeng Su, Size Chen, Xilang Yao, Detao Liu
Presently flexibly transparent film or nanopaper from all cellulose was mostly fabricated by assembling cellulose nanofibers disintegrated from macroscopic wood fibers which mostly suffers from potential environmental toxicity or high cost. In this work, we firstly reported an all-cellulose transparent film fabricated by a novel microwave-assisted ionic liquids technology (MILT). The use of MILT for treating the original all-cellulose paper brings nearly 2.6 fold-increases in optical transmission, and 2.0 fold-increases in tensile property compared to those without microwave assistance...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821045/production-of-cellulose-nanofibers-using-phenolic-enhanced-surface-oxidation
#6
Iman Beheshti Tabar, Ximing Zhang, Jeffrey P Youngblood, Nathan S Mosier
In this study we demonstrate that lignin monomers formed as byproducts of pulping or bioprocessing of lignocellulosic biomass is an effective enhancer to oxidize cellulose surfaces with ozone for the production of cellulose nanofibers (CNF). Never dried softwood pulp with minimum mercerization was enzymatically treated leading to a homogeneous pulp slurry with a higher reactivity. The slurry was oxidized by ozone gas in the presence of syringic acid, a lignin degradation model compound, as an oxidation enhancer at room temperature and pH 11...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821031/surface-deacetylated-chitin-nanofibers-reinforced-with-a-sulfobutyl-ether-%C3%AE-cyclodextrin-gel-loaded-with-prednisolone-as-potential-therapy-for-inflammatory-bowel-disease
#7
Ryo Tabuchi, Makoto Anraku, Daisuke Iohara, Takako Ishiguro, Shinsuke Ifuku, Tomone Nagae, Kaneto Uekama, Shoko Okazaki, Keizo Takeshita, Masaki Otagiri, Fumitoshi Hirayama
Surface-deacetylated chitin nanofibers (SDACNFs) reinforced with a sulfobutyl ether β-cyclodextrin (SBE-β-CD) (NFs-CDs) gel were developed to obtain a controlled release carrier of prednisolone (PD) for the treatment of colitis. PD was released slowly from the gel at both pH 1.2 and 6.8. The in vitro slow release of PD from the NFs-CDs gel was reflected in the in vivo absorption of the drug after oral administration to rats. These results suggest that a simple gel composed of a mixture of SDACNFs and SBE-β-CD has the potential for use in the controlled release of PD...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821025/fabrication-and-characterization-of-water-dispersed-chitosan-nanofiber-poly-ethylene-glycol-diacrylate-calcium-phosphate-based-porous-composites
#8
Sachiko Nitta, Ayaka Komatsu, Taisei Ishii, Masatoshi Ohnishi, Atsuko Inoue, Hiroyuki Iwamoto
We evaluated the capacity of chitosan nanofiber (CNF)- and poly(ethylene glycol) (PEG)-based hydrogel/calcium phosphate hybrid (CNF-PEG/CaP) composites to act as scaffolding materials. CNF-PEG/CaP composites were fabricated by mineralization of CNF-PEG hydrogels using an alternate soaking method. The amount of CaP mineralized on CNF-PEG hydrogels increased as the ratio of CNF in the CNF-PEG hydrogel increased. Young's modulus of CNF-PEG/CaP hydrogels was enhanced by increase in CNF ratio. It was further confirmed that osteoblasts embedded on the CNF-PEG/CaP composites were viable after incubation for 5days and firmly attached to the CaP porous layer, forming an extensive cell-scaffold leading to cell-cell interactions...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820233/regioselective-synthesis-of-eight-armed-cyclosiloxane-amphiphile-for-functional-2d-and-3d-assembly-motifs
#9
Huie Zhu, Buket Akkus, Yu Gao, Yida Liu, Shunsuke Yamamoto, Jun Matsui, Tokuji Miyashita, Masaya Mitsuishi
A crystalline tetramethylcyclotetrasiloxane (TMCS)-derived amphiphile was regioselectively synthesized with eight peripheral hydrophilic amide groups and hydrophobic dodecyl chains by Pt(0)-catalyzed hydrosilylation and amidation reactions. The as-synthesized materials showed ordered lamellar structure formation in the powder form. It also exhibits superior two-dimensional (2D) monolayer formation properties at the air-water interface with unexpectedly high collapse surface pressure and elastic modulus. The monolayers act as two-dimensional building blocks with finely controllable thickness on a several nanometer scale irrespective of the substrate type and properties...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28820213/chip-scale-alignment-of-long-dna-nanofibers-on-a-patterned-self-assembled-monolayer
#10
J Xia, M Su
Controlled alignment of long DNA nanofibers is challenging. This communication reports a method to align human genomic DNA with nearly unlimited length using lithographically produced micro-patterns of self-assembled monolayers (SAMs) with positively charged terminal groups. The micro-patterns act as local DNA reservoirs to supply DNAs for nanofiber formation, and can also stretch and align DNA nanofibers to form an ordered array by controlling the dewetting profile. By reducing the size and inter-patch distance of a micro-patch, a nearly uniform array of long DNA nanofibers can be patterned over a large area...
August 18, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28819756/nanofibers-grafted-on-titanium-alloy-the-effects-of-fiber-alignment-and-density-on-osteoblast-mineralization
#11
Hsin-Yi Lin, Zhao-Xiang Peng
The surface of medical implant alloy Ti-6Al-4V was chemically modified to allow it to covalently bond with collagen/PVA nanofibers. These nanofibers were successfully attached to the Ti-6Al-4V surface in three different morphologies: randomly oriented high-density fiber, COL(H); randomly oriented low-density fiber, COL(L); and aligned high-density fiber, COL(A). The effects of the morphology of these covalently-bound collagen nanofibers on the growth and differentiation of osteoblasts were studied for 21 days...
August 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28819219/the-fabrication-of-an-ica-sf-plcl-nanofibrous-membrane-by-coaxial-electrospinning-and-its-effect-on-bone-regeneration-in-vitro-and-in-vivo
#12
Lihua Yin, Kaijuan Wang, Xiaoqin Lv, Rui Sun, Shaohua Yang, Yujie Yang, Yanyun Liu, Jiatao Liu, Jing Zhou, Zhanhai Yu
GBR is currently accepted as one of the most effective approaches for bone defect regeneration relating to dental implant. Icariin is the main active ingredient in the extraction of total flavonoids from the Chinese traditional herb Epimediumbrevicornum Maxim. In this study, ICA was successfully incorporated into the nanofibers barrier membrane (ICA-SF/PLCL) as osteoinduction factor by coaxial electrospinning and was released in a sustained and controlled manner. The entire release period included two stages: an initial burst stage (47...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28817256/tailorable-exciton-transport-in-doped-peptide-amphiphile-assemblies
#13
Lee A Solomon, Matthew E Sykes, Yimin A Wu, Richard D Schaller, Gary P Wiederrecht, Harry Christopher Fry
Light-harvesting biomaterials are an attractive target in photovoltaics, photocatalysis, and artificial photosynthesis. Through peptide self-assembly, complex nanostructures can be engineered to study the role of chromophore organization during light absorption and energy transport. To this end, we demonstrate the one-dimensional transport of excitons along naturally occurring, light-harvesting, Zn-protoporphyrin IX chromophores within self-assembled peptide-amphiphile nanofibers. The internal structure of the nanofibers induces packing of the porphyrins into linear chains...
August 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28817096/time-resolved-study-of-nanomorphology-and-nanomechanic-change-of-early-stage-mineralized-electrospun-poly-lactic-acid-fiber-by-scanning-electron-microscopy-raman-spectroscopy-and-atomic-force-microscopy
#14
Mengmeng Wang, Yin Cai, Bo Zhao, Peizhi Zhu
In this study, scanning electron microscopy (SEM), Raman spectroscopy and high-resolution atomic force microscopy (AFM) were used to reveal the early-stage change of nanomorphology and nanomechanical properties of poly(lactic acid) (PLA) fibers in a time-resolved manner during the mineralization process. Electrospun PLA nanofibers were soaked in simulated body fluid (SBF) for different periods of time (0, 1, 3, 5, 7 and 21 days) at 10 °C, much lower than the conventional 37 °C, to simulate the slow biomineralization process...
August 17, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28816310/role-of-intrinsic-hydrogen-bonds-in-the-assembly-of-perylene-imide-derivatives-in-solution-and-at-the-liquid-solid-interface
#15
Zongxia Guo, Kun Wang, Ping Yu, Shengyue Zhang, Kai Sun, Zhibo Li
The impact of hydrogen bond formation on the supramolecular assembly of two perylene imide derivatives (PMAMI and PDINH) was systematically investigated in solution and at the liquid-solid interface. PDINH has intrinsic hydrogen bond sites, but this is not the case for PMAMI. The solution assembly was explored by morphological methods (SEM, AFM, TEM and cryo-TEM) and spectral characterization (UV-vis, FL, XRD, and FTIR spectra). The surface assembly at the liquid-solid interface was detected by scanning tunneling microscopy (STM)...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28813013/recent-advances-in-electrospun-nanofiber-interfaces-for-biosensing-devices
#16
REVIEW
Eleni Sapountzi, Mohamed Braiek, Jean-François Chateaux, Nicole Jaffrezic-Renault, Florence Lagarde
Electrospinning has emerged as a very powerful method combining efficiency, versatility and low cost to elaborate scalable ordered and complex nanofibrous assemblies from a rich variety of polymers. Electrospun nanofibers have demonstrated high potential for a wide spectrum of applications, including drug delivery, tissue engineering, energy conversion and storage, or physical and chemical sensors. The number of works related to biosensing devices integrating electrospun nanofibers has also increased substantially over the last decade...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28812762/a-facile-synthesis-of-cufe2o4-cu9s8-ppy-ternary-nanotubes-as-peroxidase-mimics-for-the-sensitive-colorimetric-detection-of-h2o2-and-dopamine
#17
Zezhou Yang, Fuqiu Ma, Yun Zhu, Sihui Chen, Ce Wang, Xiaofeng Lu
Synergistic effects play an important role in improving the catalytic activity for enzyme-like reactions. Compared to individual nanomaterials, a system consisting of multiple components usually exhibits enhanced catalytic activity as an enzyme mimic. Herein we describe the synthesis of CuFe2O4/Cu9S8/polypyrrole (PPy) ternary nanotubes as an efficient peroxidase mimic via a three-step approach involving an electrospinning process, annealing treatment and hydrothermal reaction. The remarkably enhanced catalytic activity of CuFe2O4/Cu9S8/PPy ternary nanotubes as peroxidase mimics over individual CuFe2O4 nanofibers, CuFe2O4/CuO composite nanofibers, CuFe2O4/CuS composite nanofibers, and PPy materials has been achieved, demonstrating the presence of a synergistic effect among the components...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28812354/3d-moldable-nanofiber-reinforced-transparent-composites-with-hierarchically-self-assembled-reverse-nacre-like-architecture
#18
Subir Kumar Biswas, Hironari Sano, Md Iftekhar Shams, Hiroyuki Yano
Achieving structural hierarchy and a uniform nanofiller dispersion simultaneously remains highly challenging for obtaining a robust polymer nanocomposite of immiscible components. In this study, a remarkably facile Pickering emulsification approach is developed to fabricate hierarchical composites of immiscible acrylic polymer and native cellulose nanofibers by taking advantage of the dual role of the nanofibers as both the emulsion stabilizer and polymer reinforcement. The composites feature a unique "reverse" nacre-like microstructure reinforced with well-dispersed two-tier hierarchical nanofiber network, leading to a synergistic high strength, modulus, and toughness (20, 50, and 53 times that of neat polymer, respectively), high optical transparency (89%), high flexibility and a drastically low thermal expansion (13 ppm/K, 1/15th of the neat polymer)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812342/achieving-a-collapsible-strong-and-highly-thermally-conductive-film-based-on-oriented-functionalized-boron-nitride-nanosheets-and-cellulose-nanofiber
#19
Kai Wu, Jinchao Fang, Jinrui Ma, Rui Huang, Songgang Chai, Feng Chen, Qiang Fu
Boron nitride nanosheets (BNNS) film receives wide attention in both academia and industry due to its high thermal conductivity (TC) and good electrical insulation capability. However, the brittleness and low strength of BNNS film largely limit its application. Herein, functionalized BNNS (f-BNNS) with well-maintained in-plane crystalline structure was firstly prepared utilizing urea in the aqueous solution via ball-milling for the purpose of improving its stability in water and enhancing the interaction with polymer matrix...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809535/ternary-organic-solar-cells-with-coumarin7-as-the-donor-exhibiting-over-10-power-conversion-efficiency-and-a-high-fill-factor-of-75
#20
Xinwei Chen, Si-Lu Tao, Cong Fan, Dongcheng Chen, Ling Zhou, Hui Lin, Cai-Jun Zheng, Shi-Jian Su
Ternary bulk heterojunction (BHJ) is a brilliant photovoltaic technology for improving the performance of organic solar cells (OSCs), since the light absorption range can be significantly extended by using multiple donors or acceptor materials. In this paper, coumarin7 (C7), a small organic molecule typical led used in organic light-emitting diodes, was initially exploited as second electron-donor component in ternary bulk heterojunction OSCs along with conventional blend system spolythieno[3,4-b]-thiophene/benzodithiophene(PTB7) and [6,6]-phenyl-C71 -butyric acid methyl(PC71 BM)...
August 15, 2017: ACS Applied Materials & Interfaces
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