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Light trap

Songying Qu, Yuhan Xiong, Jun Zhang
Non-metallic graphene oxide (GO) and carbon nanodots (CDots) co-doped BiOBr ternary system (GO/CDots/BiOBr) were successfully synthesized via a simple one-step solvothermal process. The compositional characterization, optical and electrical properties of photocatalysts were investigated in detail. The prepared ternary photocatalysts possessed the excellent visible-light driven photocatalytic 4-chlorophenol (4-CP) degradation. Additionally, the 4-CP removal efficiencies decreased in the order of GO/CDots/BiOBr (88...
May 15, 2018: Journal of Colloid and Interface Science
Griffin Canning, Alan K Thomas, David H Dunlap, John K Grey
Non-geminate charge recombination occurs over a broad range of time scales in polymer solar cells and represents a serious loss channel for the performance and lifetime of devices. Multiple factors influence this process, including changes in morphology and formation of permanent defects, but individual contributions are often difficult to resolve from conventional experiment. We use intensity modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) to investigate non-geminate charge recombination in blends of poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta [2,1-b;3,4-b']dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) and [6,6]-phenyl-C61-butyric acid methyl ester, PCBM) solar cells...
May 21, 2018: ACS Applied Materials & Interfaces
P Halada, K Hlavackova, J Risueño, E Berriatua, P Volf, V Dvorak
Sandflies (Diptera: Psychodidae) (Newstead, 1911) are blood-feeding insects that transmit human pathogens including Leishmania (Trypanosomatida: Trypanosomatidae) parasites, causative agents of the leishmaniases. To elucidate Leishmania transmission cycles, conclusive identification of vector species is essential. Molecular approaches including matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) protein profiling have recently emerged to complement morphological identification...
May 18, 2018: Medical and Veterinary Entomology
C Pin, J-B Jager, M Tardif, E Picard, E Hadji, F de Fornel, B Cluzel
Fourteen years ago, optical lattices and holographic tweezers were considered as a revolution, allowing for trapping and manipulating multiple particles at the same time using laser light. Since then, near-field optical forces have aroused tremendous interest as they enable efficient trapping of a wide range of objects, from living cells to atoms, in integrated devices. Yet, handling at will multiple objects using a guided light beam remains a challenging task for current on-chip optical trapping techniques...
May 18, 2018: Lab on a Chip
Xiangzhou Lao, Zhi Yang, Zhicheng Su, Zilan Wang, Honggang Ye, Minqiang Wang, Xi Yao, Shijie Xu
Very recently, all-inorganic perovskite CsPbX3 (X = Cl, Br, I) nanostructures such as nanoparticles, nanoplates, and nanorods have been extensively explored. These CsPbX3 nanostructures exhibit excellent optical properties; however, the photophysics involved is not yet clear. Herein, the emission properties and luminescence mechanism of CsPbBr3 nanosheets (NSs) were investigated using steady-state and time-resolved photoluminescence (PL) spectroscopic techniques. Moreover, two kinds of excitonic emissions (Peak 1 and Peak 2) are observed at low temperatures (<80 K) under the conditions of low excitation level...
May 17, 2018: Nanoscale
José A Rodrigo, Tatiana Alieva
A scalar polymorphic beam is designed with independent control of its intensity and phase along a strongly focused laser curve of arbitrary shape. This kind of beam has been found crucial in the creation of freestyle laser traps able to confine and drive the motion of micro/nano-particles along reconfigurable 3D trajectories in real time. Here, we present and experimentally prove the concept of vector polymorphic beam adding the benefit of independent design of the light polarization along arbitrary curves...
May 16, 2018: Scientific Reports
Dinesh Erram, Nathan Burkett-Cadena
BACKGROUND: Biting midges of the genus Culicoides (Diptera: Ceratopogonidae) exert a significant impact on animal agriculture worldwide because they transmit bluetongue virus (BTV) and epizootic hemorrhagic disease virus (EHDV) to ruminants. Without effective vaccines, BTV/EHDV vector management strategies are needed, particularly in commercial white-tailed deer (WTD) facilities. However, detailed information on the ecology of midge immatures in/around cervid operations is currently lacking...
May 16, 2018: Parasites & Vectors
Feng Li, Jing Li, Jie Zhang, Lili Gao, Xuefeng Long, Yiping Hu, Shuwen Li, Jun Jin, Jiantai Ma
The photoelectrochemical (PEC) water splitting efficiency of hematite-based photoanode is still far from the theoretical value due to its poor surface reaction kinetics and high density of surface trapping states. To solve these drawbacks, a photoanode consisting of NiO nanoparticles anchored on a gradient P-doped α-Fe2O3 nanorod (NR) array (NiO/P-α-Fe2O3) was fabricated to achieve optimal light absorption and charge separation, and rapid surface reaction kinetic. Specifically, the photoanode with the NR arrays structure allowed high mass transport rate to be achieved while the P-doping effectively decreased surface trapping sites and improved the electrical conductivity of α-Fe2O3...
May 16, 2018: ChemSusChem
Mohammad H Zarifi, Benjamin Daniel Wiltshire, Najia Mahdi, Karthik Shankar, Mojgan Daneshmand
A large signal DC bias and a small signal microwave bias were simultaneously applied to TiO2 nanotube membranes mounted on a planar microwave resonator. The DC bias modulated the electron concentration in the TiO2 nanotubes, and was varied between 0 and 120 V in this study. Transients immediately following the application and removal of DC bias were measured by monitoring the S-parameters of the resonator as a function of time. The DC bias stimulated Poole-Frenkel type trap-mediated electrical injection of excess carriers into TiO2 nanotubes which resulted in a near constant resonant frequency but a pronounced decrease in the microwave amplitude due to free electron absorption...
May 16, 2018: ACS Applied Materials & Interfaces
Haoming Bao, Hongwen Zhang, Le Zhou, Hao Fu, Guangqiang Liu, Yue Li, Weiping Cai
A flexible route is developed for fabrication of large area α-Cu2S nanorod arrays (NRAs) based on one step laser ablating a copper foil in CS2 liquid. It has been demonstrated that the obtained products are the high temperature phase α-Cu2S and consist of the nanorods vertically standing on the Cu foil, exhibiting the array. The nanorods were about 1 μm in length and around 100 nm in thickness, and built by stacking the nearly spherical and <110>-oriented nanoparticles (NPs) up. Such array can be peeled off from the foil and free-standing...
May 16, 2018: ACS Applied Materials & Interfaces
Shijie Li, Shiwei Hu, Wei Jiang, Yanping Liu, Yu Liu, Yingtang Zhou, Liuye Mo, Jianshe Liu
To develop efficient and stable visible-light-driven (VLD) photocatalysts for pollutant degradation, we synthesized novel heterojunction photocatalysts comprised of AgI nanoparticle-decorated Ag2 WO4 nanorods via a facile method. Various characterization techniques, including XRD, SEM, TEM, EDX, and UV-vis DRS were used to investigate the morphology and optical properties of the as-prepared AgI/Ag2 WO4 catalyst. With AgI acting as the cocatalyst, the resulting AgI/Ag2 WO4 heterostructure shows excellent performance in degrading toxic, stable pollutants such as rhodamine B (RhB), methyl orange (MO) and para -chlorophenol (4-CP)...
2018: Beilstein Journal of Nanotechnology
Joel Mouatcho, Anthony J Cornel, Yael Dahan-Moss, Lizette L Koekemoer, Maureen Coetzee, Leo Braack
BACKGROUND: The Anopheles gambiae sensu lato (s.l.) and Anopheles funestus s.l. species complexes contain the most important malaria vectors in Africa. Within the An. funestus group of at least 11 African species, the vector status of all but the nominal species An. funestus appears poorly investigated, although evidence exists that Anopheles rivulorum and Anopheles vaneedeni may play minor roles. A new species, An. rivulorum-like, was described from Burkina Faso in 2000 and subsequently also found in Cameroon and Zambia...
May 15, 2018: Malaria Journal
Violeta Sicilia, Lorenzo Arnal, Sara Fuertes, Antonio Martín
New bis-pyrazole complexes [Pt(C^C*)(RpzH)2]X, containing a cyclometalated N-heterocyclic carbene ligand (HC^C* = 1-(4-(ethoxycarbonyl)phenyl)-3-methyl-1H-imidazol-2-ylidene) were prepared as chloride (X = Cl-, RpzH: 3,5-Me2pzH 1a, 4-MepzH 2a, pzH 3a), perchlorate (X = ClO4-,1b  3b), or hexafluorophosphate (X = PF6-, RpzH: 3,5-Me2pzH 1c) salts. The X-ray structure of 1a showed that the Cl- anion is trapped by the cation through two N-H***Cl bonds. In solution of methanol, acetone and THF at r.t. 1a-3a, coexist in equilibrium with the corresponding [PtCl(C^C*)(RpzH)](B) and RpzH species...
May 15, 2018: Chemistry: a European Journal
Guo Liu, Shi Xi Liu
Exposure to traffic-related air pollutants(TRAP)has been implicated in airway allergic diseases.Recent findings include epidemiologic and mechanistic studies that shed new light on the impact of TRAP on allergic rhinitis(AR)and the biology underlying this impact.These studies have found that oxidative stress induced by TRAP could affect the axis of epithelial cell-dendritic cell-T cell towards a T-helper 2 immune response,which is the major mechanism between TRAP and AR.Further,epigenetics and microRNA might be involved in this process...
January 20, 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
Bruno M Carvalho, Thiago Vasconcelos Dos Santos, Iorlando da R Barata, José Aprígio N Lima, Fernando T Silveira, Mariana M Vale, Paul D Ready, Elizabeth F Rangel
In southeast Amazon, Lutzomyia (Nyssomyia) flaviscutellata is the incriminated vector of Leishmania (Leishmania) amazonensis, a causative agent of zoonotic cutaneous leishmaniasis (CL). The optimal methods for surveying Lu. flaviscutellata were investigated in the Bragança region, northeast Pará State, Brazil, selected for the presence of Le. amazonensis. The performances of modified Disney traps and CDC light traps were compared in four ecotopes within and around four village transects during the wet and dry seasons...
June 2018: Journal of Vector Ecology: Journal of the Society for Vector Ecology
Narong Jaturas, Apichat Vitta, Yudthana Samung, Chamnarn Apiwathnasorn, Raxsina Polseela
We investigated the nocturnal activity of cave-dwelling sand flies at different time intervals and determined their species composition and seasonal variation. Sand flies were captured on one night each month using CDC light traps from 18:00-06:00 with the collecting bag being changed every two h between February, 2010 and January, 2011. A total of 18,709 individuals, including 10,740 males and 7,969 females, was collected. The overall ratio between male and female specimens was 1:0.74. The collected specimens included 14 species from four genera, Chinius, Idiophlebotomus, Phlebotomus, and Sergentomyia...
June 2018: Journal of Vector Ecology: Journal of the Society for Vector Ecology
Yongmei Xia, Zuming He, Jiangbin Su, Ya Liu, Bin Tang
The novel SrTiO3 /Bi5 O7 I nanocomposites were successfully fabricated by a thermal decomposition approach. The as-prepared samples were characterized by XRD, XPS, SEM, EDS, FTIR, DRS and PL spectra. The results show that the SrTiO3 /Bi5 O7 I nanocomposites are composed of perovskite SrTiO3 nanoparticles and tetragonal Bi5 O7 I nanorods. The SrTiO3 /Bi5 O7 I nanocomposites exhibit an excellent photocatalytic performance for the degradation of RhB solution under simulated solar light irradiation, which is superior to that of pristine Bi5 O7 I and SrTiO3 ...
May 11, 2018: Nanoscale Research Letters
Kyung-Hoon Han, Young-Sam Park, Doo-Hee Cho, Yoonjay Han, Jonghee Lee, Byoung-Gon Yu, Nam Sung Cho, Jeong-Ik Lee, Jang-Joo Kim
Recently, we have addressed that a formation mechanism of a nano-lens array (NLA) fabricated by using a maskless vacuum deposition is explained as the increase in surface tension of organic molecules induced by their crystallization. Here, as another research using finite difference time domain (FDTD) simulations, not electric field intensities but transmitted energies of electromagnetic waves inside and outside top-emitting blue organic light emitting diodes (TOLEDs), without and with NLAs, are obtained, to easily grasp the effect of NLA formation on the light extraction of TOLEDs...
May 11, 2018: ACS Applied Materials & Interfaces
Bisheng Li, Cui Lai, Guangming Zeng, Lei Qin, Huan Yi, Danlian Huang, Chengyun Zhou, Xigui Liu, Min Cheng, Piao Xu, Chen Zhang, Fanglong Huang, Shiyu Liu
An efficient binary Bi2Fe4O9/Bi2WO6 Z-scheme heterojunction was fabricated through facile hydrothermal route. The obtained Bi2Fe4O9/Bi2WO6 displays high catalytic activity for Rhodamine B (RhB) photodegradation, and 100% of RhB was photodegraded by Bi2Fe4O9 (7%)/Bi2WO6 within 90 min, which is much better than pure Bi2Fe4O9 and Bi2WO6. The effective photoinduced carriers separation, the broadened photoabsorption range, high oxidation capacity of hole and the high reduction power of electron are charge of the elevated catalytic activity because of the formed Z-scheme system...
May 10, 2018: ACS Applied Materials & Interfaces
P Gaydecki
Instrumentation and software for the automated analysis of insect flight trajectories is described, intended for quantifying the behavioural dynamics of moths in the vicinity of artificial light. For its time, this moth imaging system was relatively advanced and revealed hitherto undocumented insights into moth flight behaviour. The illumination source comprised a 125 W mercury vapour light, operating in the visible and near ultraviolet wavelengths, mounted on top of a mobile telescopic mast at heights of 5 and 7...
May 10, 2018: Bulletin of Entomological Research
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