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https://www.readbyqxmd.com/read/30528253/micro-solid-phase-extraction-of-some-polycyclic-aromatic-hydrocarbons-from-environmental-water-samples-using-magnetic-%C3%AE-cyclodextrin-carbon-nano-tube-composite-as-a-sorbent
#1
Mina Yazdanpanah, Saeed Nojavan
Previous studies have demonstrated the excellent capability of the cyclodextrins in pre-concentration of the organic pollutants from the aqueous solutions. In this work, β-cyclodextrin- multiwalled carbon nano-tube composite was produced from the reaction of oxidized carbon nano-tube with cyclodextrin in the presence of the hydrazine hydrate, and subsequently attaching this composite to the iron oxide nano-particles. Prepared magnetic nano-composite was characterized by the attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), the thermogravimetric analysis (TGA), the field emission scanning electron microscopy (FESEM), and the X-ray diffraction (XRD)...
November 24, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/30456618/pure-ultra-fine-carbon-particles-do-not-exert-pro-coagulation-and-inflammatory-effects-on-microvascular-endothelial-cells
#2
Hossein Dinmohammadi, Zahra Pirdel, Laleh Salarilak, Marc Hoylaerts, Reza Nejatbakhsh, Alireza Biglari, Marc Jacquemin, Tina Shahani
Pro-thrombotic and inflammatory changes play an important role in cardiovascular morbidity and mortality, resulting from short-term exposure to fine particulate air-pollution. Part of those effects has been attributed to the ultra-fine particles (UFPs) that pass through the lung and directly contact blood-exposed and circulating cells. Despite UFP-induced platelet activation, it is unclear whether the penetrated particles exert any direct effect on endothelial cells. While exposure levels are boosting as a result of world-wide increases in economic development and desertification, which create more air-polluted regions, as well as increase in demands for synthetic UFPs in medicine and various industries, further studies on the health effects of these particles are required...
November 19, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30451491/high-conductivity-argyrodite-li-6-ps-5-cl-solid-electrolytes-prepared-via-optimized-sintering-processes-for-all-solid-state-lithium-sulfur-batteries
#3
Shuo Wang, Yibo Zhang, Xue Zhang, Ting Liu, Yuan-Hua Lin, Yang Shen, Liangliang Li, Ce-Wen Nan
Highly Li-ion conductive Li6 PS5 Cl solid-state electrolytes (SSEs) were prepared by solid-state sintering method. The influence of sintering temperature and duration on the phase, ionic conductivity, and activation energy of Li6 PS5 Cl was systematically investigated. The Li6 PS5 Cl electrolyte with a high ionic conductivity of 3.15 × 10-3 S cm-1 at room temperature (RT) was obtained by sintering at 550 °C for just 10 min, which was more efficient taking into account such a short preparation time in comparison with other reported methods to synthesize Li6 PS5 Cl SSEs...
November 29, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30441900/metal-air-transistors-semiconductor-free-field-emission-air-channel-nanoelectronics
#4
Shruti Nirantar, Taimur Ahmed, Guanghui Ren, Philipp Gutruf, Chenglong Xu, Madhu Bhaskaran, Sumeet Walia, Sharath Sriram
Scattering-free transport in vacuum tubes has always been superior to solid-state transistors. It is the advanced fabrication with mass production capability at low cost which drove solid-state nano-electronics. Here, we combine the best of vacuum tubes with advanced nanofabrication technology. We present nano-scale, metal-based, field emission air channel transistors. Comparative analysis of tungsten, gold, and platinum based devices is presented. Devices are fabricated with electron beam lithography, achieving channel lengths less than 35 nm...
November 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/30441640/microbes-culture-system-using-cellulose-tubes-and-photocatalyst-coated-glass-balls
#5
K Saito, K Fujimoto, K Higashi, N Miki
Currently, microbes are utilized in many fields, such as medicine, food and environment etc. For more application of microbes, we need a new culture system, which can culture target microbes in large quantities at low cost. Thereupon, we propose a culture system using cellulose tubes. Target microbes are encapsulated inside the cellulose tubes, where they acquire nutrients and oxygen through nano pores of the tubes and are protected from competitive microbes even in open environment. To further increase the amount of oxygen and nutritions available for the target microbes, we propose photocatalyst-coated glass balls (PCGB) to sterilize competing microbes outside the tubes...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/30429307/microbial-tubeworm-associations-in-a-440-million-year-old-hydrothermal-vent-community
#6
Magdalena N Georgieva, Crispin T S Little, Russell J Bailey, Alexander D Ball, Adrian G Glover
Microorganisms are the chief primary producers within present-day deep-sea hydrothermal vent ecosystems, and play a fundamental role in shaping the ecology of these environments. However, very little is known about the microbes that occurred within, and structured, ancient vent communities. The evolutionary history, diversity and the nature of interactions between ancient vent microorganisms and hydrothermal vent animals are largely undetermined. The oldest known hydrothermal vent community that includes metazoans is preserved within the Ordovician to early Silurian Yaman Kasy massive sulfide deposit, Ural Mountains, Russia...
November 14, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/30413027/thermal-vibration-induced-rotation-of-nano-wheel-a-molecular-dynamics-study
#7
Haiyan Duan, Jiao Shi, Kun Cai, Qing-Hua Qin
By bending a straight carbon nanotube and bonding both ends of the nanotube, a nanoring (or nano-wheel) is produced. The nanoring system can be driven to rotate by fixed outer nanotubes at room temperature. When placing some atoms at the edge of each outer tube (the stator here) with inwardly radial deviation (IRD), the IRD atoms will repulse the nanoring in their thermally vibration-induced collision and drive the nanoring to rotate when the repulsion due to IRD and the friction with stators induce a non-zero moment about the axis of rotational symmetry of the ring...
November 8, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/30386827/effect-of-carbon-nano-tubes-and-dispersions-of-sic-and-al-2-o-3-on-the-mechanical-and-physical-properties-of-copper-nickel-alloy
#8
S El-Khatib, A Y Shash, A H Elsayed, A El-Habak
This paper investigates the mechanical and physical properties of Cu-Ni alloy (at 50-50 wt. %), mixed with different reinforcement materials such as carbon nanotubes CNT (0.5-2 wt. %) as nano particles, Al2 O3 (1-4 wt. %) and SiC (1-4 wt. %) as microparticles. The obtained composite specimens characteristics were evaluated such as microstructure, density, electrical conductivity, thermal conductivity, hardness, and compression properties to determine the suitable reinforcement percentage that has the best physical and mechanical properties...
October 2018: Heliyon
https://www.readbyqxmd.com/read/30360185/separation-of-halloysite-nano-tubes-hnts-by-homogenization-of-quartz-contaminated-kaolins
#9
Jing Ming Zhao, Jeong Ho Chang, Youn Ki Lee, Kyu Hong Hwang, Jong Kook Lee
Natural halloysite kaolin contains a lot of impurities such as quartz phases and varies in morphology and size during their formation in the earth. So to utilize as a new type of natural nano material, removing quartz impurities from kaolin clays without scathe the tube morphologies are necessary. So to remove quartz impurities from kaolin by forming a well deflocculated aqueous slip without fracturing the morphology of tubes, the slip of homogenized halloysite clay was recovered by adding polyvalent metallic cations and anionic polyelectrolyte flocculants simultaneously to selectively flocculate the mixture of quartz and halloysite, whereby the halloysite particles form floes and the tubular halloysite remains in suspensions...
February 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30347731/ultrasensitive-and-multifunction-plasmonic-temperature-sensor-with-ethanol-sealed-asymmetric-ellipse-resonators
#10
Jun Zhu, Jian Lou
In order to improve the low temperature sensitivity of conventional sensors, a plasmonic multifunction temperature sensor with high sensitivity is proposed and investigated systematically in this paper. The sensor consists of two metal layers and two ethanol-sealed elliptical resonators connected to a straight waveguide by two rectangular tubes. We numerically analyzed the transmission characteristics of the Nano-device to assess its performance with the finite element method and achieved great optical properties...
October 19, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30286275/emergence-of-new-density-strength-scaling-law-in-3d-hollow-ceramic-nanoarchitectures
#11
Ye-Eun Na, Dahye Shin, Kisun Kim, Changui Ahn, Seokwoo Jeon, Dongchan Jang
Density-strength tradeoff appears to be an inherent limitation for most materials and therefore design of cell topology that mitigates strength decrease with density reduction has been a long-lasting engineering pursue for porous materials. Continuum-mechanics-based analyses of mechanical responses of conventional porous materials with bending-dominated structures often give the density-strength scaling law following the power-law relationship with an exponent of 1.5 or higher, which consequentially determines the upper bound of the specific strength for a material to reach...
October 4, 2018: Small
https://www.readbyqxmd.com/read/30280558/interface-design-strategy-for-the-fabrication-of-highly-stretchable-strain-sensors
#12
Zhen Sang, Kai Ke, Ica Manas-Zloczower
Simultaneously achieving high piezoresistive sensitivity, stretchability, and good electrical conductivity in conductive elastomer composites (CECs) with carbon nanofillers is crucial for stretchable strain sensor and electrode applications. Here, we report a facile and environmentally friendly strategy to realize these three goals at once by using branched carbon nanotubes, also known as the carbon nanostructure (CNS). Inspired by the brick-wall structure, a robust segregated conductive network of a CNS is formed in the thermoplastic polyurethane (TPU) matrix at a very low filler fraction, which renders the composite very good electrical, mechanical, and piezoresistive properties...
October 24, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30280181/movement-of-palladium-nanoparticles-in-hollow-graphitised-nanofibres-the-role-of-migration-and-coalescence-in-nanocatalyst-sintering-during-the-suzuki-miyaura-reaction
#13
Rhys W Lodge, Graham A Rance, Michael W Fay, Andrei N Khlobystov
The evolution of individual palladium nanoparticle (PdNP) catalysts in graphitised nanofibres (GNF) in the liquid-phase Suzuki-Miyaura (SM) reaction has been appraised. The combination of identical location-transmission electron microscopy (IL-TEM) and a nano test tube approach allowed spatiotemporally continuous observations at the single nanoparticle level, revealing that migration and coalescence is the most significant pathway to coarsening of the nanocatalyst, rather than Ostwald ripening. IL-TEM gave unprecedented levels of detail regarding the movement of PdNP on carbon surfaces at the nanoscale, including size-dependent migration and directional movement, opening horizons for the optimisation of future catalysts through surface morphology design...
October 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/30272442/flexible-electrochemical-urea-sensor-based-on-surface-molecularly-imprinted-nanotubes-for-detection-of-human-sweat
#14
Yan-Ling Liu, Rong Liu, Yu Qin, Quan-Fa Qiu, Zhen Chen, Shi-Bo Cheng, Wei-Hua Huang
Flexible electrochemical (EC) sensors have shown great prospect in epidermal detection for personal healthcare and disease diagnosis. However, no reports have been seen in flexible device for urea analysis in body fluids. Herein, we developed a flexible wearable EC sensor based on surface molecularly imprinted nanotubes for noninvasive urea monitoring with high selectivity in human sweat. The flexible EC sensor was prepared by electropolymerization of 3,4-ethylenedioxythiophene (EDOT) monomer on the hierarchical network of carbon nanotubes (CNTs) and gold nanotubes (Au NTs) to imprint template molecule urea...
November 6, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/30248328/protease-resistant-cell-meshworks-an-indication-of-membrane-nanotube-based-syncytia-formation
#15
Oskar Staufer, Jochen E Hernandez B, Amin Rustom
Cell biology considers most animal tissues as assemblies of "individual" cells that rely on different contact-dependent communication mechanisms, including synapses, gap junctions or - a recent awareness - membrane nano- and microtubes. However, by protease-mediated singularization of dense 2D/ 3D cell cultures and tissue explants, we show here that cell collectives stay connected via a continuous meshwork of F-actin-based membrane tubes, resembling tunneling nanotube (TNT)-based networks observed between dispersed cell cultures...
September 21, 2018: Experimental Cell Research
https://www.readbyqxmd.com/read/30194948/separation-of-cells-in-density-gradients-with-temporary-solidification-of-the-gradient-application-to-escherichia-coli-forms-obtained-by-microwave-treatment-of-pure-cultures
#16
Tatiana Abashina, Mikhail Vainshtein, Saara Korpela, Timo Korpela
Gelatin added in certain concentration into the density gradient mixtures allows to solidify and melt the gradient reversibly. Such a method was applied to separation of partially disintegrated Escherichia coli VKM B-125 cells in discontinuous sucrose gradient which was optimized to obtain small round "nano-cells" free from other cell components. Gelatin added to the sucrose solutions had the advantages: i) accurate gradient layers were formed, ii) gelatin did not interfere with the cells and sub-particles during centrifugation, iii) solidified gelatin allowed to cut out the separated cell components, and iv) gelatin allowed to prepare ready-made solidified gradient centrifugation tubes into storage...
September 5, 2018: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/30194453/an-assessment-of-retention-behavior-for-gold-nanorods-in-asymmetrical-flow-field-flow-fractionation
#17
Hind El Hadri, Julien Gigault, Jiaojie Tan, Vincent A Hackley
Applications of asymmetrical flow field-flow fractionation (AF4) continue to expand rapidly in the fields of nanotechnology and biotechnology. In particular, AF4 has proven valuable for the separation and analysis of particles, biomolecular species (e.g., proteins, bacteria) and polymers (natural and synthetic), ranging in size from a few nanometers to several micrometers. The separation of non-spheroidal structures (e.g., rods, tubes, etc.) with primary dimensions in the nanometer regime, is a particularly challenging application deserving of greater study and consideration...
November 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/30161240/nano-printed-miniature-compound-refractive-lens-for-desktop-hard-x-ray-microscopy
#18
Mona Mirzaeimoghri, Alejandro Morales Martinez, Alireza Panna, Eric E Bennett, Bertrand M Lucotte, Don L DeVoe, Han Wen
Hard x-ray lenses are useful elements in x-ray microscopy and in creating focused illumination for analytical applications such as x-ray fluorescence imaging. Recently, polymer compound refractive lenses for focused illumination in the soft x-ray regime (< 10 keV) have been created with nano-printing. However, there are no such lenses yet for hard x-rays, particularly of short focal lengths for benchtop microscopy. We report the first instance of a nano-printed lens for hard x-ray microscopy, and evaluate its imaging performance...
2018: PloS One
https://www.readbyqxmd.com/read/30140628/inhibition-of-retinal-angiogenesis-by-gold-nanoparticles-via-inducing-autophagy
#19
Ni Shen, Rui Zhang, Hao-Rui Zhang, Hao-Yang Luo, Wei Shen, Xin Gao, Da-Zhi Guo, Jie Shen
AIM: To investigate the effect of gold nanoparticles on retinal angiogenesis in vitro and in vivo , and to reveal the possible mechanism. METHODS: Seed growth method was used to synthesize gold nanoparticles (GNPs). The size, zeta potential, absorption spectrum and morphology of GNPs were identified using Malvern Nano-ZS, multimode reader (BioTek synergy2) and transmission electron microscope. Cell viability was analyzed using cell counting kit-8 method and cell growth was assessed with EdU kit...
2018: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/30139935/comparison-of-atomic-scale-dynamics-for-the-middle-and-late-transition-metal-nanocatalysts
#20
Kecheng Cao, Thilo Zoberbier, Johannes Biskupek, Akos Botos, Robert L McSweeney, Abdullah Kurtoglu, Craig T Stoppiello, Alexander V Markevich, Elena Besley, Thomas W Chamberlain, Ute Kaiser, Andrei N Khlobystov
Catalysis of chemical reactions by nanosized clusters of transition metals holds the key to the provision of sustainable energy and materials. However, the atomistic behaviour of nanocatalysts still remains largely unknown due to uncertainties associated with the highly labile metal nanoclusters changing their structure during the reaction. In this study, we reveal and explore reactions of nm-sized clusters of 14 technologically important metals in carbon nano test tubes using time-series imaging by atomically-resolved transmission electron microscopy (TEM), employing the electron beam simultaneously as an imaging tool and stimulus of the reactions...
August 23, 2018: Nature Communications
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