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https://www.readbyqxmd.com/read/29144119/self-assembly-driven-aggregation-induced-emission-of-copper-nanoclusters-a-novel-technology-for-lighting
#1
Yi Liu, Dong Yao, Hao Zhang
Because of the specific properties including HOMO-LUMO electronic transition, size-dependent fluorescent emission, and intense light absorption, metal nanoclusters (NCs) have been considered to be one of the most competitive color conversion materials in light-emitting diodes (LEDs). However, the monotonous emission color and the low emission stability and intensity of individual metal NCs strongly limit their universal application. Inspired by the concept of "aggregation-induced emission" (AIE), the utilization of highly ordered metal NC assemblies opens a door to resolve these problems...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29143930/photovoltaic-cell-electrical-heating-system-for-removing-snow-on-panel-including-verification
#2
Agnes Weiss, Helmut Weiss
Small photovoltaic plants in private ownership are typically rated at 5 kW (peak). The panels are mounted on roofs at a decline angle of 20° to 45°. In winter time, a dense layer of snow at a width of e.g., 10 cm keeps off solar radiation from the photovoltaic cells for weeks under continental climate conditions. Practically, no energy is produced over the time of snow coverage. Only until outside air temperature has risen high enough for a rather long-time interval to allow partial melting of snow; the snow layer rushes down in an avalanche...
November 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29143060/how-to-realize-a-spin-dependent-seebeck-diode-effect-in-metallic-zigzag-%C3%AE-graphyne-nanoribbons
#3
Dan-Dan Wu, Qing-Bo Liu, Hua-Hua Fu, Ruqian Wu
The spin-dependent Seebeck effect (SDSE) is one of the core topics of spin caloritronics. In the traditional device designs of spin-dependent Seebeck rectifiers and diodes, finite spin-dependent band gaps of materials are required to realize the on-off characteristic in thermal spin currents, and nearly zero charge current should be achieved to reduce energy dissipation. Here, we propose that two ferromagnetic zigzag γ-graphyne nanoribbons (ZγGNRs) without any spin-dependent band gaps around the Fermi level can not only exhibit the SDSE, but also display rectifier and diode effects in thermal spin currents characterized by threshold temperatures, which originates from the compensation effect occurring in spin-dependent transmissions but not from the spin-splitting band gaps in materials...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29143003/a-mixed-dimensional-light-emitting-diode-based-on-a-p-mos2-nanosheet-and-an-n-cdse-nanowire
#4
Pan Li, Kai Yuan, Der-Yuh Lin, Xiaolong Xu, Yilun Wang, Yi Wan, Haoran Yu, Kun Zhang, Yu Ye, Lun Dai
The construction of the mixed-dimensional van der Waals (vdW) heterostructures with two-dimensional (2D) and one-dimensional (1D) materials can advantageously integrate their respective dimensional properties to produce new device functionalities and/or enhance device performance. In this case, a single semiconductor nanowire (NW) can function as an optical cavity and a gain medium, while the atomically thin 2D material does not strongly absorb the NW's light emission or disturb the optical propagation mode...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29142388/analysis-of-free-amino-acids-in-different-extracts-of-orthosiphon-stamineus-leaves-by-high-performance-liquid-chromatography-combined-with-solid-phase-extraction
#5
Armaghan Shafaei, Nor Hidayah Ab Halim, Norhidayah Zakaria, Zhari Ismail
Background: Orthosiphon stamineus (OS) Benth is a medicinal plant and native in Southeast Asia. Previous studies have shown that OS leaves possess antioxidant, cytotoxic, diuretic, antihypertensive, and uricosuric effects. These beneficial effects have been attributed to the presence of primary and secondary metabolites such as polyphenols, amino acids, and flavonoids. Objective: To develop and validate an high-performance liquid chromatography (HPLC)-diode array detector (DAD) method combined with solid-phase extraction that involves precolumn derivatization with O-phthaladehyde for simultaneous analysis of free amino acids in OS leaves extracts...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29140683/nanocomposite-phosphor-consisting-of-cai2-eu-2-single-nanocrystals-embedded-in-crystalline-sio2
#6
Hisayoshi Daicho, Takeshi Iwasaki, Yu Shinomiya, Akitoshi Nakano, Hiroshi Sawa, Wataru Yamada, Satoru Matsuishi, Hideo Hosono
High luminescence efficiency is obtained in halide- and chalcogenide-based phosphors, but they are impractical because of their poor chemical durability. Here we report a halide-based nanocomposite phosphor with excellent luminescence efficiency and sufficient durability for practical use. Our approach was to disperse luminescent single nanocrystals of CaI2:Eu(2+) in a chemically stable, translucent crystalline SiO2 matrix. Using this approach, we successfully prepared a nanocomposite phosphor by means of self-organization through a simple solid-state reaction...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29140334/carrier-envelope-offset-stabilization-of-a-ghz-repetition-rate-femtosecond-laser-using-opto-optical-modulation-of-a-sesam
#7
Sargis Hakobyan, Valentin J Wittwer, Kutan Gürel, Aline S Mayer, Stéphane Schilt, Thomas Südmeyer
We demonstrate, to the best of our knowledge, the first carrier-envelope offset (CEO) frequency stabilization of a GHz femtosecond laser based on opto-optical modulation (OOM) of a semiconductor saturable absorber mirror (SESAM). The 1.05-GHz laser is based on a Yb:CALGO gain crystal and emits sub-100-fs pulses with 2.1-W average power at a center wavelength of 1055 nm. The SESAM plays two key roles: it starts and stabilizes the mode-locking operation and is simultaneously used as an actuator to control the CEO frequency...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140329/demonstration-of-a-cw-diode-pumped-ar-metastable-laser-operating-at-4%C3%A2-%C3%A2-w
#8
J Han, M C Heaven, P J Moran, G A Pitz, E M Guild, C R Sanderson, B Hokr
Optically pumped rare gas lasers are being investigated as potential high-energy, high beam quality systems. The lasing medium consists of rare gas atoms (Rg=Ne, Ar, Kr, or Xe) that have been electric discharge excited to the metastable np(5)(n+1)s P32 state. Following optical excitation, helium (He) at pressures of 200-1000 Torr is used as the energy transfer agent to create a population inversion. The primary technical difficulty for this scheme is the discharge production of sufficient Rg* metastables in the presence of >200  Torr of He...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140080/vapor-assisted-solution-approach-for-high-quality-perovskite-ch3nh3pbbr3-thin-films-for-high-performance-green-light-emitting-diodes-applications
#9
Huifang Ji, Zhifeng Shi, Xuguang Sun, Ying Li, Sen Li, Lingzhi Lei, Di Wu, Tingting Xu, Xinjian Li, Guotong Du
Vapor-assisted solution method was developed to prepare the high-quality organic-inorganic halide perovskite CH3NH3PbBr3 (MAPbBr3) thin films. We detailedly investigated the effect of evaporation time and temperature of MABr powder on the microstructure, crystallinity and optical characterizations of MAPbBr3 thin films, and a controllable morphology evolution with varying surface coverage was observed. Temperature-dependent and time-resolved photoluminescence (PL) measurements were carried out to investigate the optical transition mechanisms and carrier recombination dynamics of MAPbBr3 thin films...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29139609/development-of-a-high-throughput-method-based-on-thin-film-microextraction-using-a-96-well-plate-system-with-a-cork-coating-for-the-extraction-of-emerging-contaminants-in-river-water-samples
#10
Lucas Morés, Adriana Neves Dias, Eduardo Carasek
In this study, a new method was developed in which a biosorbent material is used as the extractor phase in conjunction with a recently described sample preparation technique called thin-film microextraction and a 96-well plate system. The method was applied to the determination of emerging contaminants, such as 3-(4-methylbenzylidene) camphor, ethylparaben, triclocarban and bisphenol A, in water samples. The separation and detection of the analytes were performed by high-performance liquid chromatography with diode array detection...
November 15, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29139000/effect-of-light-polarization-on-the-efficiency-of-photodynamic-therapy-of-basal-cell-carcinomas-an-in-vitro-cellular-study
#11
M JalalKamali, S N Nematollahi-Mahani, M Shojaei, A Shamsoddini, N Arabpour
In an in vitro study, the effect of light polarization on the efficiency of 5-aminolaevulinic acid (ALA) photodynamic therapy (PDT) of basal cell carcinoma (BCC) was investigated. Three states of light polarization (non-polarized, linearly polarized, and circularly polarized) were considered. Cells were exposed to green (532 pm 20 nm) irradiation from light emitting diodes. Cell survival was measured by the colorimetric assay (WST-1) and Trypan blue staining. The colorimetric assay showed a pronounced decrease in the cell viability (up to 30%) using polarized light compared to the non-polarized one in the wavelength region used...
November 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29138778/dual-phosphorescence-emission-of-dinuclear-platinum-ii-complex-incorporating-cyclometallating-pyrenyl-dipyridine-based-ligand-and-its-application-in-near-infrared-solution-processed-polymer-light-emitting-diodes
#12
Zhaoran Hao, Fanyuan Meng, Pu Wang, Yafei Wang, Hua Tan, Yong Pei, Shijian Su, Yu Liu
Two novel mono- and binuclear cyclometalated platinum(ii) complexes of (BuPyrDPy)Pt(dpm) and (BuPyrDPy)[Pt(dpm)]2 incorporating a pyrenyl-dipyridine-based cyclometalated ligand were synthesized and characterized, respectively. Single-crystal X-ray diffraction of the two materials revealed each complex's coordination mode; their photophysical, electrochemical as well as electroluminescent properties were also investigated. Both complexes exhibited good solubility and excellent thermal stability. (BuPyrDPy)[Pt(dpm)]2 presented dual phosphorescence emissive character at room-temperature and showed an increased quantum efficiency compared to that of (BuPyrDPy)Pt(dpm)...
November 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29137200/a-lab-on-a-chip-based-non-invasive-optical-sensor-for-measuring-glucose-in-saliva
#13
Dong Geon Jung, Daewoong Jung, Seong Ho Kong
A lab-on-a-chip (LOC)-based non-invasive optical sensor for measuring glucose in saliva was fabricated. Existing glucose sensors utilizing blood require acquisition of a blood sample by pricking the finger, which is painful and inconvenient. To overcome these limitations, we propose a non-invasive glucose sensor with LOC, micro-electro-mechanical system and optical measurement technology. The proposed sensor for measuring glucose in saliva involves pretreatment, mixing, and measurement on a single tiny chip...
November 13, 2017: Sensors
https://www.readbyqxmd.com/read/29137120/aspidosperma-pyrifolium-has-anti-inflammatory-properties-an-experimental-study-in-mice-with-peritonitis-induced-by-tityus-serrulatus-venom-or-carrageenan
#14
Maíra Conceição Jerônimo de Souza Lima, Mariana Angélica Oliveira Bitencourt, Allanny Alves Furtado, Manoela Torres-Rêgo, Emerson Michell da Silva Siqueira, Ruth Medeiros Oliveira, Hugo Alexandre Oliveira Rocha, Keyla Borges Ferreira Rocha, Arnóbio Antônio da Silva-Júnior, Silvana Maria Zucolotto, Matheus de Freitas Fernandes-Pedrosa
Scorpions of the genus Tityus are responsible for the majority of envenomation in Brazil, the Tityus serrulatus species being the most common and dangerous in South America. In this approach, we have investigated the ability of the aqueous extract from the leaves of Aspidosperma pyrifolium in reducing carrageenan-induced inflammation and the inflammation induced by T. serrulatus envenomation in mice. We also evaluated the cytotoxic effects of this extract, using the 3-(4,5-dimethythiazol-2-yl)-2,5-diphenyl-2H-tetrazolium (MTT) assay and the results revealed that the extract is safe...
November 11, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29136910/low-cost-approach-to-increase-the-analysis-throughput-of-bar-adsorptive-microextraction-ba%C3%A2%C2%B5e-combined-with-environmentally-friendly-renewable-sorbent-phase-of-recycled-diatomaceous-earth
#15
Gabriela Mafra, Anderson Luiz Oenning, Adriana Neves Dias, Josias Merib, Dilma Budziak, Cristian Berto da Silveira, Eduardo Carasek
In this study, a novel apparatus for bar adsorptive microextraction (BAµE) using a voltage regulator was proposed as an alternative tool to improve the analysis throughput. In addition, recycled diatomaceous earth obtained as a brewery residue was employed as a biosorbent coating for the determination of methyl paraben, ethyl paraben, benzophenone and triclocarban in water samples by high-performance liquid chromatography-diode array detection (HPLC-DAD). The use of the extraction devices, comprised of floating adsorptive bars of 7...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136839/chromisense-a-colourimetric-lab-on-a-disc-sensor-for-chromium-speciation-in-water
#16
G Duffy, I Maguire, Brendan Heery, Pauline Gers, J Ducrée, F Regan
The development of a centrifugal device for quantitative analysis of both chromium (III) and (VI) species in water is reported. ChromiSense is a colourimetric sensor system that has been applied to the measurement of chromium in spiked river water samples. For analysis, the sample is loaded into a reservoir on the disposable microfluidic disc, along with reagents. A centrifugal force is created by spinning the disc to pump liquids through microchannels, causing them to mix and react to form a coloured product...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136828/compact-detectors-made-of-paired-leds-for-photometric-and-fluorometric-measurements-on-paper
#17
Marta Fiedoruk-Pogrebniak, Mateusz Granica, Robert Koncki
The utility of strikingly simple and cheap optoelectronic detectors operating according to a Paired-Emitter-Detector-Diode (PEDD) principle for microfluidic paper-based analytical devices (μPAD) has been experimentally confirmed. The prototypes of these compact detectors have been made of only two customary light emitting diodes without any additional optical parts like lens, filters, fibers etc. Moreover, for their operation economic and portable equipment is required (low-power circuit and ordinary voltmeter)...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136806/multivariate-analysis-of-organic-acids-in-fermented-food-from-reversed-phase-high-performance-liquid-chromatography-data
#18
Pablo Mortera, Federico A Zuljan, Christian Magni, Santiago A Bortolato, Sergio H Alarcón
Multivariate calibration coupled to RP-HPLC with diode array detection (HPLC-DAD) was applied to the identification and the quantitative evaluation of the short chain organic acids (malic, oxalic, formic, lactic, acetic, citric, pyruvic, succinic, tartaric, propionic and α-cetoglutaric) in fermented food. The goal of the present study was to get the successful resolution of a system in the combined occurrence of strongly coeluting peaks, of distortions in the time sensors among chromatograms, and of the presence of unexpected compounds not included in the calibration step...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136460/graphitic-nitrogen-triggers-red-fluorescence-in-carbon-dots
#19
Katerina Hola, Mária Sudolská, Sergii Kalytchuk, Dana Nachtigallova, Andrey L Rogach, Michal Otyepka, Radek Zbořil
Carbon dots (CDs) are a stable and highly biocompatible fluorescent material offering great application potential in cell labeling, optical imaging, LED diodes, and optoelectronic technologies. Because their emission wavelengths provide the best tissue penetration, red-emitting CDs are of a particular interest for applications in biomedical technologies. Current synthetic strategies enabling red-shifted emission include increasing the CD particle size (sp2 domain) by a proper synthetic strategy and tuning the surface chemistry of CDs with suitable functional groups (e...
November 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/29134807/a-high-time-resolution-optical-sensor-for-monitoring-atmospheric-nitrogen-dioxide
#20
Yong Tian, Xiaomin Zhang, Hui-Yan Shen, Aifeng Liu, Zongshan Zhao, Ming-Li Chen, Xuwei Chen
High-time resolution monitoring nitrogen dioxide (NO2) is of great importance for studying the formation mechanism of aerosol and improving air quality. Based on the Griess-Saltzman (GS) reaction, a portable NO2 optical sensor was developed by employing a porous polypropylene membrane tube (PPMT) integrated gas permeation collector and detector. The PPMT was filled with GS reagents and covered with a coaxial jacket tube for gas collection. Its two ends were respectively fixed with a yellowish green light emitting diode and a photodiode for optic signal reception...
November 14, 2017: Analytical Chemistry
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