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https://www.readbyqxmd.com/read/28449549/fabrication-of-tio2-nanosheet-aarrays-graphene-cu2o-composite-structure-for-enhanced-photocatalytic-activities
#1
Jinzhao Huang, Ke Fu, Xiaolong Deng, Nannan Yao, Mingzhi Wei
TiO2 NSAs/graphene/Cu2O was fabricated on the carbon fiber to use as photocastalysts by coating Cu2O on the graphene (G) decorated TiO2 nanosheet arrays (NSAs). The research focus on constructing the composite structure and investigating the reason to enhance the photocatalytic ability. The morphological, structural, and photocatalytic properties of the as-synthesized products were characterized. The experimental results indicate that the better photocatalytic performance is ascribed to the following reasons...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449543/nanoporous-cyanate-ester-resins-structure-gas-transport-property-relationships
#2
Kristina Gusakova, Alexander Fainleib, Eliane Espuche, Olga Grigoryeva, Olga Starostenko, Fabrice Gouanve, Gisèle Boiteux, Jean-Marc Saiter, Daniel Grande
This contribution addresses the relationships between the structure and gas transport properties of nanoporous thermostable cyanate ester resins (CERs) derived from polycyclotrimerization of 1,1'-bis(4-cyanatophenyl)ethane in the presence of 30 or 50 wt% of inert high-boiling temperature porogens (i.e., dimethyl- or dibutyl phthalates), followed by their quantitative removal. The nanopores in the films obtained were generated via a chemically induced phase separation route with further porogen extraction from the densely crosslinked CERs...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449542/estimation-of-the-number-of-quantum-dots-immobilized-on-an-ultra-flat-au-surface
#3
Hiroki Ito, Atsushi Iio, Katsutoshi Tokuhara, Hiroyuki Sakaue, Yutaka Kadoya, Hitoshi Suzuki
Quantum dots (QDs) were immobilized on an ultra-flat Au surface by using amide binding between the carboxyl groups on the QDs and the amino groups of the self-assembled monolayer on the surface. The number density of the QDs estimated by atomic force microscopy (AFM) agreed with the quantity of QDs estimated by X-ray photoelectron spectroscopy and fluorescence microscopy. QDs were also immobilized on dot patterns fabricated by e-beam lithography. AFM was able to identify clusters of just a few QDs on the dot patterns, whose minimum designed size was 50 nm × 50 nm per dot...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449406/a-water-stable-dual-channel-luminescence-sensor-for-uo22-ion-based-on-an-anionic-terbium-iii-metal-organic-framework
#4
Junwei Ye, Raji Feyisa Bogale, Yangwei Shi, Yanzhen Chen, Xigang Liu, Yaoyao Yang, Siqi Zhang, Jianzhang Zhao, Guiling Ning
A stable 3D Tb(III)-based metal-organic framework [Tb(BPDC)2]*(CH3)2NH2 (DUT-101) was synthesized, and it is the first efficient dual-channel luminescence sensor for aqueous UO22+ ion. DUT-101 possesses an anionic three-dimensional framework and protonated dimethylamine molecules embedded within the channels. Intense green emission of DUT-101 could be highly selectively and sensitively quenched by UO22+ ions even in the coexistence of other competing metal ions. The possible sensing mechanism was proposed as well based on both suppression of luminescence resonance energy transfer and enhancement of intermolecular electronic transfer...
April 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28449325/electrosynthesis-of-bifunctional-ws3-x-rgo-hybrid-for-her-and-orr-electrocatalysis
#5
Martin Pumera
We combined the desirable properties of tungsten sulfide and reduced graphene oxide (rGO) and fabricated the hybrid materials through simultaneous electrochemical reduction and synthesis, as a versatile and environmentally benign alternative to conventional fabrication techniques. We synthesised a mixed WS2/WS3 film-like material (WS3-x) directly onto GO-modified glassy carbon electrodes via cyclic voltammetry (CV) and the resultant hybrid materials (WS3-x/rGO) were thoroughly characterised using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) as well as Raman spectroscopy...
April 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28448832/fabrication-of-a-novel-z-scheme-g-c3n4-bi4o7-heterojunction-photocatalyst-with-enhanced-visible-light-driven-activity-toward-organic-pollutants
#6
Meng Sun, Yu Wang, Yu Shao, Yunhui He, Qi Zeng, Huikai Liang, Tao Yan, Bin Du
In this work, highly efficient g-C3N4/Bi4O7 heterojunction photocatalysts have been successfully fabricated by a facile method. Compared with the bare photocatalysts, the obtained g-C3N4/Bi4O7 hybrid photocatalysts exhibited efficient degradation activity toward methylene blue (MB), phenol, rhodamine B (RhB), and bisphenol A (BPA) under visible light irradiation. The influences of different g-C3N4 contents on the photocatalytic efficiency of the hybrid photocatalysts have been investigated. The results revealed that the g-C3N4/Bi4O7 with g-C3N4 mass ratio of 30% exhibited the best photocatalytic activity...
April 19, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28448714/octopus-inspired-assembly-of-nanosucker-arrays-for-dry-wet-adhesion
#7
Ying-Chu Chen, Hongta Yang
The octopus is able to adhere to slippery, fouled and irregular surfaces in the marine intertidal environment, because of its periodic infundibulum-shaped suckers on the arms. Here, we report a scalable self-assembly technique for fabricating adhesion materials that mimic octopus-sucker functionality. By utilizing spin-coated two-dimensional colloidal crystals as templates, non-close-packed nanosucker arrays are patterned on silicone substrates. The resulting nanosuckers can be deformed to exhibit great adhesive capacities on both micro-rough and flat surfaces in dry and wet environments...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28448600/mscs-feeder-layers-induce-smg-self-organization-and-branching-morphogenesis
#8
Mahmoud Farahat, Gulsan Ara Sathi, Emilio Satoshi Hara, Hiroaki Taketa, Takuo Kuboki, Takuya Matsumoto
Dysfunction of salivary glands leads to several oral health problems, including dental caries, mastication and swallowing dysfunctions and multiple oral infections. Conventional treatments for such condition fell short of providing satisfying therapeutic results. Recent advances in organ regeneration therapy which utilize tissue stem cells to fabricate bioengineered 3D organ buds, have introduced a promising therapeutic tool for full functional organ regeneration. However, finding a sustainable and easily accessible cell source for such approaches is still challenging, especially in case of severely atrophied tissues such as irradiated salivary glands...
2017: PloS One
https://www.readbyqxmd.com/read/28448276/white-light-emission-of-monolithic-ingan-gan-grown-on-morphology-controlled-nanostructured-gan-templates
#9
Keun Man Song, Do Hyun Kim, Jong Min Kim, Chu-Young Cho, Jehyuk Choi, Ka Hee Kim, Jinsub Park, Hogyoung Kim
We demonstrated an InGaN/GaN-based, monolithic, white light-emitting diode (LED) without phosphors by using morphology-controlled active layers formed on multi-facet GaN templates containing polar and semipolar surfaces. The nanostructured surface morphology was controlled by changing the growth time, and distinct multiple photoluminescence peaks were observed at 360, 460, and 560 nm; these features were caused by InGaN/GaN-based multiple quantum wells (MQWs) on the nanostructured facets. The origin of each multi-peak was related to the different indium (In) compositions in the different planes of the quantum wells grown on the nanostructured GaN...
April 27, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28448274/top-down-fabricated-tapered-gaas-nanowires-with-sacrificial-etching-of-the-mask
#10
Navneet Dhindsa, Simarjeet Saini
A novel fabrication method using controlled sacrificial etching of the mask is utilized to fabricate tapered vertical GaAs nanowire arrays. Experimental measurements of the absorption characteristics show that the tapered nanowires absorb over a broadband range as compared to cylindrical ones. The broadband characterization is verified by using optical modeling and results from improved coupling of the nanowires due to distinct radial HE modes being excited separately in the taper and the cylindrical part. The absorption is found to be more broadband as compared to conical nanowires studied so far...
April 27, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28448124/bioinspired-engineering-of-poly-ethylene-glycol-hydrogels-and-natural-protein-fibers-for-layered-heart-valve-constructs
#11
Qian Li, Yun Bai, Tao Jin, Shuo Wang, Wei Cui, Ilinca Stanciulescu, Rui Yang, Hemin Nie, Linshan Wang, Xing Zhang
Layered constructs from poly(ethylene glycol) (PEG) hydrogels and chicken eggshell membranes (ESMs) are fabricated, which can be further crosslinked by glutaraldehyde (GA) to form GA-PEG-ESM composites. Our results indicate that ESMs composed of protein fibrous networks show elastic moduli ~3.3-5.0 MPa and elongation percentages ~47-56%, close to human heart valve leaflets. Finite element simulations reveal obvious stress concentration on a partial number of fibers in the GA-crosslinked ESM (GA-ESM) samples, which can be alleviated by efficient stress distribution among multiple layers of ESMs embedded in PEG hydrogels...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28448119/sulfur-nano-dots-stitched-in-2d-bubble-like-interconnected-carbon-fabric-as-reversibility-enhanced-cathodes-for-lithium-sulfur-batteries
#12
Feng Wu, Yusheng Ye, Jia-Qi Huang, Teng Zhao, Ji Qian, Yuanyuan Zhao, Li Li, Lei Wei, Rui Luo, Yongxin Huang, Yi Xing, Renjie Chen
The behavior of two-dimensional (2D) materials for energy-storage systems relates to their morphology and physicochemical properties. Although various 2D materials can be found in different fields, the open access of these materials has greatly hampered their practical applications, such as in lithium sulfur batteries, where the soluble intermediates should be controlled. Here, we have developed a facile approach to prepare 2D ultra-thin interconnected carbon fabrics (ICFs) with "bubble-like" morphology and abundant mesopores using a "blowing bubble" method...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28448115/high-temperature-superconductivity-in-boron-doped-q-carbon
#13
Anagh Bhaumik, Ritesh Sachan, Jagdish Narayan
We report high-temperature superconductivity in B-doped amorphous quenched carbon (Q-carbon). This phase is formed after nanosecond laser melting of B-doped amorphous carbon films in a super undercooled state and followed by rapid quenching. Magnetic susceptibility measurements show the characteristics of type-II Bardeen-Cooper-Schrieffer superconductivity with a superconducting transition temperature (Tc) of 36.0±0.5 K for 17.0±1.0 atomic percent boron concentration. This value is significantly higher than the best experimentally reported Tc of 11 K for crystalline B-doped diamond...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28447989/fabrication-of-extracellular-matrix-derived-foams-and-microcarriers-as-tissue-specific-cell-culture-and-delivery-platforms
#14
Anna Kornmuller, Cody F C Brown, Claire Yu, Lauren E Flynn
Cell function is mediated by interactions with the extracellular matrix (ECM), which has complex tissue-specific composition and architecture. The focus of this article is on the methods for fabricating ECM-derived porous foams and microcarriers for use as biologically-relevant substrates in advanced 3D in vitro cell culture models or as pro-regenerative scaffolds and cell delivery systems for tissue engineering and regenerative medicine. Using decellularized tissues or purified insoluble collagen as a starting material, the techniques can be applied to synthesize a broad array of tissue-specific bioscaffolds with customizable geometries...
April 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447983/high-temperature-fabrication-of-nanostructured-yttria-stabilized-zirconia-ysz-scaffolds-by-in-situ-carbon-templating-xerogels
#15
Sixbert P Muhoza, Matthew A Cottam, Michael D Gross
We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) scaffolds with tunable specific surface areas up to 80 m(2)·g(-1). An aqueous solution of a zirconium salt, yttrium salt, and glucose is mixed with propylene oxide (PO) to form a gel. The gel is dried under ambient conditions to form a xerogel. The xerogel is pressed into pellets and then sintered in an argon atmosphere. During sintering, a YSZ ceramic phase forms and the organic components decompose, leaving behind amorphous carbon...
April 16, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447865/a-versatile-stretch-sensor-for-measuring-physiological-movement-using-a-centre-loaded-end-supported-load-cell
#16
Syrpailyne Wankhar, Albert A Kota, Dheepak Selvaraj
Acquisition of movement of some body parts can provide important physiological information. In clinical practice as well as for research purposes different types of sensors such as piezoelectric crystals, conductive rubber and optical displacement sensors are used for such measurements. Each of these sensors is associated with its problems. This paper discusses the use of a stretch sensor constructed using a small metal bar, approximately the size of a zipper slider that can be sewn into a fabric in the form of a belt...
April 27, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/28447780/high-and-selective-carbon-dioxide-capture-in-nitrogen-containing-aerogels-via-synergistic-effects-of-electrostatic-in-plane-and-dispersive-%C3%AF-%C3%AF-stacking-interactions
#17
Li Yang, Guanjun Chang, Dapeng Wang
A new strategy for CO2 capture is reported based on the synergistic effect of electrostatic in-plane and dispersive π-π stacking interactions of amide and indole with CO2. Density functional theory (DFT) illustrated that the amide group can have an increased ability to capture CO2 molecules that was just desorbed from an adjacent indole unit. We used this strategy to fabricate a microporous aerogel that exhibited superior CO2 capture performance in both dry and wet conditions. The proposed synergistic effect is expected to be a new rationale for the design of CO2 capture materials...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447776/investigation-of-the-changes-in-electronic-properties-of-nickel-oxide-niox-due-to-uv-ozone-treatment
#18
Raisul Islam, Gang Chen, Pranav Ramesh, Junkyo Suh, Nobi Fuchigami, Donovan Lee, Karl A Littau, Kurt Weiner, Reuben T Collins, Krishna C Saraswat
Drastic reduction in nickel oxide (NiOx) film resistivity and ionization potential is observed when subjected to ultraviolet (UV)/ ozone (O3) treatment. X-ray photoemission spectroscopy suggests that UV/O3 treatment changes the film stoichiometry by introducing Ni vacancy defects. Oxygen-rich NiOx having Ni vacancy defects behaves as a p type semiconductor. Therefore, in this work, a simple and effective technique to introduce doping in NiOx is shown. Angle resolved XPS reveals that the effect of UV/O3 treatment does not only alter the film surface property, but also introduces oxygen-rich stoichiometry throughout the depth of the film...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447603/efficient-self-emulsification-via-cooling-heating-cycles
#19
Slavka Tcholakova, Zhulieta Valkova, Diana Cholakova, Zahari Vinarov, Ivan Lesov, Nikolai Denkov, Stoyan K Smoukov
In self-emulsification higher-energy micrometre and sub-micrometre oil droplets are spontaneously produced from larger ones and only a few such methods are known. They usually involve a one-time reduction in oil solubility in the continuous medium via changing temperature or solvents or a phase inversion in which the preferred curvature of the interfacial surfactant layer changes its sign. Here we harness narrow-range temperature cycling to cause repeated breakup of droplets to higher-energy states. We describe three drop breakup mechanisms that lead the drops to burst spontaneously into thousands of smaller droplets...
April 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28447487/tissue-engineered-vascular-grafts-current-state-of-the-field
#20
Chin Siang Ong, Xun Zhou, Chen Yu Huang, Takuma Fukunishi, Huaitao Zhang, Narutoshi Hibino
Conventional synthetic vascular grafts are limited by the inability to remodel, as well as issues of patency at smaller diameters. Tissue-engineered vascular grafts (TEVGs), constructed from biologically active cells and biodegradable scaffolds have the potential to overcome these limitations, and provide growth capacity and self-repair. Areas covered: This article outlines the TEVG design, biodegradable scaffolds, TEVG fabrication methods, cell seeding, drug delivery, strategies to reduce wait times, clinical trials, as well as a 5-year view with expert commentary...
April 27, 2017: Expert Review of Medical Devices
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