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https://www.readbyqxmd.com/read/28453943/supercharging-a-mno-sub-2-sub-nanowire-an-amine-altered-morphology-retains-capacity-at-high-rates-and-mass-loadings
#1
Girija Thesma Chandran, Gaurav Jha, Shaopeng Qiao, Mya Le Thai, Rajen Kumar Dutta, Alana F Ogata, Ji-Soo Jang, Il-Doo Kim, Reginald M Penner
The influence of hexamethylenetetraamine (HMTA) on the morphology of δ- MnO<sub>2</sub> and its properties for electrical energy storage are investigated - specifically for ultra-thick δ-MnO<sub>2<\sub> layers in the micron scale. Planar arrays of gold@δ-MnO<sub>2</sub>, core@shell nanowires, were prepared by electrodeposition with and without the HMTA and their elec- trochemical properties evaluated. HMTA alters the MnO<sub>2</sub> in three ways: First, it creates a more open morphology for the MnO<sub>2</sub> coating, characterized by "petals" with a thickness of 6 nm to 9 nm, rather than much thinner δ-MnO<sub>2</sub> sheets seen in the absence of HMTA...
April 28, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28453914/the-shape-of-things-to-come-the-formation-of-modulated-nematic-mesophases-at-various-length-scales
#2
Richard J Mandle
The twist-bend nematic phase is a recently discovered liquid-crystalline phase that exhibits macroscopic chirality even when formed from achiral materials, and as such presents a unique testbed for studies concerning the spontaneous breaking of mirror symmetry in soft matter. It is primarily exhibited by materials whose molecular structure is composed of two rigid aromatic units (such as biphenyl connected by a flexible spacer). The local structure of the NTB phase is nematic-like - with molecules having an average orientational order but no positional order - with a nanoscale helix where the pitch is of the order of several nanometres...
April 28, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28448933/in-vitro-bioaccessibility-of-copper-azole-following-simulated-dermal-transfer-from-pressure-treated-wood
#3
Jennifer L Griggs, Kim R Rogers, Clay Nelson, Todd Luxton, William E Platten, Karen D Bradham
Micronized copper azole (MCA) and micronized copper quaternary (MCQ) are the latest wood preservatives to replace the liquid alkaline copper and chromated copper arsenate preservatives due to concerns over the toxicity or lack of effectiveness of the earlier formulations. Today, the use of MCA has become abundant in the wood preservative industry with approximately 38millionlbs of copper carbonate being used to treat lumber each year. Despite this widespread usage, little information is available on the bioaccessibility of this preservative upon gastrointestinal exposure...
April 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28447978/high-resolution-thermal-micro-imaging-using-europium-chelate-luminescent-coatings
#4
Timothy M Benseman, Yang Hao, Vitalii K Vlasko-Vlasov, Ulrich Welp, Alexei E Koshelev, Wai-Kwong Kwok, Ralu Divan, Courtney Keiser, Chiharu Watanabe, Kazuo Kadowaki
Micro-electronic devices often undergo significant self-heating when biased to their typical operating conditions. This paper describes a convenient optical micro-imaging technique which can be used to map and quantify such behavior. Europium thenoyltrifluoroacetonate (EuTFC) has a 612 nm luminescence line whose activation efficiency drops strongly with increasing temperature, due to T-dependent interactions between the Eu(3+) ion and the organic chelating compound. This material may be readily coated on to a sample surface by thermal sublimation in vacuum...
April 16, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28446793/demonstration-of-shot-noise-limited-swept-source-oct-without-balanced-detection
#5
Vala Fathipour, Tilman Schmoll, Alireza Bonakdar, Skylar Wheaton, Hooman Mohseni
Optical coherence tomography (OCT) has been utilized in a rapidly growing number of clinical and scientific applications. In particular, swept source OCT (SS-OCT) has attracted many attentions due to its excellent performance. So far however, the limitations of existing photon detectors have prevented achieving shot-noise-limited sensitivity without using balanced-detection scheme in SS-OCT, even when superconducting single-photon detectors were used. Unfortunately, balanced-detection increases OCT system size and cost, as it requires many additional components to boost the laser power and maintain near ideal balanced performance across the whole optical bandwidth...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28446781/inkjet-printing-of-high-performance-transistors-with-micron-order-chemically-set-gaps
#6
Peter Mack Grubb, Harish Subbaraman, Saungeun Park, Deji Akinwande, Ray T Chen
This paper reports a 100% inkjet printed transistor with a short channel of approximately 1 µm with an operating speed up to 18.21 GHz. Printed electronics are a burgeoning area in electronics development, but are often stymied by the large minimum feature size. To combat this, techniques were developed to allow for the printings of much shorter transistor channels. The small gap size is achieved through the use of silver inks with different chemical properties to prevent mixing. The combination of the short channel and semiconducting carbon nanotubes (CNT) allows for an exceptional experimentally measured on/off ratio of 10(6)...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28443926/defect-induced-ferromagnetism-in-mgo-and-its-exceptional-enhancement-upon-thermal-annealing-a-case-of-transformation-of-various-defect-states
#7
Nimai Pathak, Santosh Kumar Gupta, C L Prajapat, S K Sharma, P S Ghosh, Buddhadev Kanrar, P K Pujari, R M Kadam
MgO particles of few micron size are synthesized through a sol-gel method at different annealing temperatures such as 600 °C (MgO-600), 800 °C (MgO-800) and 1000 °C (MgO-1000). EDX and ICP-AES studies confirmed a near total purity of the sample with respect to paramagnetic metal ion impurities. Magnetic measurements showed a low temperature weak ferromagnetic ordering with a TC (Curie temperature) around 65 K (±5 K). Unexpectedly, the saturation magnetization (Ms) was found to be increased with increasing annealing temperature during synthesis...
April 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28443720/modulatory-effects-of-a-nutraceutical-supplement-on-saos-2-cells-reveal-its-phlebotonic-activity
#8
Sergio Ammendola, Mario Di Loreto, Anna Scotto d'Abusco
OBJECTIVE: Herbal extract compositions are largely used to manage vein diseases. We prepared a new composition of herbs, named FLEBO OK™, that, when administered as a nutraceutical to patients affected by peripheral vascular diseases, was able to improve their health conditions. We analyzed the effects of this nutraceutical composition on in vitro cultured cells with the aim to obtain information about its mechanisms of action. METHODS: A culture of human osteoblast cell line Saos-2 was stimulated with tumor necrosis factor (TNF)-α or interleukin (IL)-1β to induce the expression of some chemokines and matrix metalloproteases (MMPs)...
April 26, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28441752/photocatalytic-and-adsorption-performances-of-faceted-cuprous-oxide-cu%C3%A2-o-particles-for-the-removal-of-methyl-orange-mo-from-aqueous-media
#9
Weng Chye Jeffrey Ho, Qiuling Tay, Huan Qi, Zhaohong Huang, Jiao Li, Zhong Chen
Particles of sub-micron size possess significant capacity to adsorb organic molecules from aqueous media. Semiconductor photocatalysts in particle form could potentially be utilized for dye removal through either physical adsorption or photo-induced chemical process. The photocatalytic and adsorption capabilities of Cu₂O particles with various exposed crystal facets have been studied through separate adsorption capacity test and photocatalytic degradation test. These crystals display unique cubic, octahedral, rhombic dodecahedral, and truncated polyhedral shapes due to specifically exposed crystal facet(s)...
April 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28440658/revealing-large-scale-homogeneity-and-trace-impurity-sensitivity-of-gaas-nanoscale-membranes
#10
Zhuo Yang, Alessandro Surrente, Gözde Tütüncüoglu, Krzysztof Galkowski, Melanie Cazaban-Carrazé, Francesca Amaduzzi, Pierre Leroux, Duncan K Maude, Anna Fontcuberta I Morral, Paulina Plochocka
III-V nanostructures have the potential to revolutionize optoelectronics and energy harvesting. For this to become a reality, critical issues such as reproducibility and sensitivity to defects should be resolved. By discussing the optical properties of MBE grown GaAs nanomembranes we highlight several features that bring them closer to large scale applications. Uncapped membranes exhibit a very high optical quality, expressed by extremely narrow neutral exciton emission, allowing the resolution of the more complex excitonic structure for the first time...
April 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28439587/a-micron-scale-laminar-mapbbr3-single-crystal-for-an-efficient-and-stable-perovskite-solar-cell
#11
Hua-Shang Rao, Bai-Xue Chen, Xu-Dong Wang, Dai-Bin Kuang, Cheng-Yong Su
Nowadays, obtaining a thin and large-area perovskite single-crystal (SC) is still challenging. Herein, we report a novel strategy to prepare a laminar MAPbBr3 SC with a controllable thickness of 16 μm and a size of 6 × 8 mm. Additionally, the SC solar cell achieves an intriguing efficiency of 7.11% with an impressive stability, maintaining 93% initial PCE after aging for 1000 h.
April 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28437974/efficient-reversible-phase-mask-for-tio-sub-2-sub-submicron-gratings-directly-printed-on-cylindrical-surfaces
#12
L Berthod, M Bichotte, I Verrier, C Veillas, T Kämpfe, F Vocanson, M Langlet, J Laukkanen, O Parriaux, Y Jourlin
In this article we present a radial phase mask specially designed and manufactured for direct micro-structuration under UV photolithography of a cylindrical surface covered by a photoresist TiO<sub>2</sub> film. The period of the phase mask is sub-micron (between 480 nm and 720 nm) and allows direct printing on several types of cylindrical components. With this dedicated reversible phase mask we have demonstrated the feasibility of a TiO<sub>2</sub> grating with a period of 960 nm, printed on a SiO<sub>2</sub> cylinder or inside a SiO<sub>2</sub> tube of 8 mm diameter...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437650/indoor-to-outdoor-relationship-of-aerosol-particles-inside-a-naturally-ventilated-apartment-a-comparison-between-single-parameter-analysis-and-indoor-aerosol-model-simulation
#13
Tareq Hussein
The indoor-to-outdoor relationship of aerosol particles is affected by several mechanisms including penetration, ventilation rate, dry deposition rate and sources. Understanding the effect of these factors is essential for a deeper knowledge of the indoor-to-outdoor relationship. In real-life conditions, it is difficult to analyze these factors in a naturally ventilated environment. In this study, a naturally ventilated and an occupied apartment was used to investigate the indoor-to-outdoor relationship of aerosol particles by applying two different techniques; single-parameter analysis and indoor aerosol model simulation...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28435077/improving-blend-content-uniformity-via-dry-particle-coating-of-micronized-drug-powders
#14
Zhonghui Huang, Wannan Xiong, Kuriakose Kunnath, Sayani Bhaumik, Rajesh N Davé
Content uniformity of low dose blends with fine active pharmaceutical ingredients (API) is adversely impacted due to API agglomeration caused by high powder cohesion. Dry coating using high-intensity vibratory mixing is employed to reduce API cohesion and granular Bond number as well as agglomeration as predicted by contact models, hence improve blend content uniformity (CU). Micronized acetaminophen (mAPAP) (~10μm), a model API, was dry coated with nano-silica R972P (20nm), and mixed with Avicel 102. The amount of silica was varied from 0 to 2...
April 20, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28430279/microcontact-printing-with-aminosilanes-creating-biomolecule-micro-and-nanoarrays-for-multiplexed-microfluidic-bioassays
#15
Shivani Sathish, Sébastien G Ricoult, Kazumi Toda-Peters, Amy Q Shen
Microfluidic systems integrated with protein and DNA micro- and nanoarrays have been the most sought-after technologies to satisfy the growing demand for high-throughput disease diagnostics. As the sensitivity of these systems relies on the bio-functionalities of the patterned recognition biomolecules, the primary concern has been to develop simple technologies that enable biomolecule immobilization within microfluidic devices whilst preserving bio-functionalities. To address this concern, we introduce a two-step patterning approach to create micro- and nanoarrays of biomolecules within microfluidic devices...
April 21, 2017: Analyst
https://www.readbyqxmd.com/read/28429015/asymmetric-electroosmotic-pumping-across-porous-media-sandwiched-with-perforated-ion-exchange-membranes
#16
A Yaroshchuk, E E Licón, E K Zholkovskiy, M P Bondarenko, T Heldal
To have non-zero net flow in AC electroosmotic pumps, the electroosmosis (EO) has to be non-linear and asymmetric. This can be achieved due to ionic concentration polarization. This is known to occur close to micro-/nano-interfaces provided that the sizes of the nanopores are not too large compared to the Debye screening length. However, operation of the corresponding EO pumps can be quite sensitive to the solution concentration and, thus, unstable in practical applications. Concentration polarization of ion-exchange membranes is much more robust...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28428617/deterministic-spin-orbit-torque-induced-magnetization-reversal-in-pt-co-ni-n-co-ta-multilayer-hall-bars
#17
Sihua Li, Sarjoosing Goolaup, Jaesuk Kwon, Feilong Luo, Weiliang Gan, Wen Siang Lew
Spin-orbit torque (SOT) induced by electric current has attracted extensive attention as an efficient method of controlling the magnetization in nanomagnetic structures. SOT-induced magnetization reversal is usually achieved with the aid of an in-plane bias magnetic field. In this paper, we show that by selecting a film stack with weak out-of-plane magnetic anisotropy, field-free SOT-induced switching can be achieved in micron sized multilayers. Using direct current, deterministic bipolar magnetization reversal is obtained in Pt/[Co/Ni]2/Co/Ta structures...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28427071/is-laser-still-important-in-diabetic-macular-edema-as-primary-or-deferral-therapy
#18
Maurizio Battaglia Parodi, Francesco Bandello
Laser treatment was used in the past to reduce the visual loss due to diabetic macular edema. The recent advent of anti-vascular endothelial growth factor (anti-VEGF) has completely revolutionized the management of diabetic retinopathy, with a significant improvement in the overall prognosis. Nevertheless, macular laser can still be applied in selected cases characterized by retinal thickness ≤400 microns, high visual acuity, extrafoveal location, and contraindications to the intravitreal approach with anti-VEGF and steroids...
2017: Developments in Ophthalmology
https://www.readbyqxmd.com/read/28426196/chiral-inorganic-nanostructures
#19
Wei Ma, Liguang Xu, André F de Moura, Xiaoling Wu, Hua Kuang, Chuanlai Xu, Nicholas A Kotov
The field of chiral inorganic nanostructures is rapidly expanding. It started from the observation of strong circular dichroism during the synthesis of simple nanoparticles (NPs) and their assemblies mediated by biomolecules and expanded to sophisticated synthetic protocols involving nanostructures from metals, semiconductors, ceramics, and nanocarbons. Besides the well-established chirality transfer from bioorganic molecules, other methods to impart handedness to nanoscale matter specific to inorganic materials were discovered, including three-dimentional lithography, multiphoton chirality transfer, polarization effects in nanoscale assemblies, and others...
April 20, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28425430/dose-assessment-from-chronic-exposure-to-industrial-norm-in-iron-ore-processing
#20
Franck Dal-Molin, Raymond Fisher, David Frost, David R Anderson, David Read
Radiological exposures due to naturally occurring radioactive material (NORM) can occur during a wide range of work-related activities in the mineral processing and chemical industries. However, evaluation of such exposures in industrial settings remains a difficult exercise owing inter alia to the large number of personnel, operations and plants affected; assumptions that often have to be made concerning the actual duration and frequency of exposures; the complex chemistry and radioactive disequilibria involved and typically, the paucity of historical data...
April 20, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
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