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https://www.readbyqxmd.com/read/28531089/au-nanoparticle-decorated-silicon-pyramids-for-plasmon-enhanced-hot-electron-near-infrared-photodetection
#1
Zhiyang Qi, Yusheng Zhai, Long Wen, Qilong Wang, Qin Chen, Sami Iqbal, Guangdian Chen, Ji Xu, Yan Tu
Heterojunction between metal and silicon (Si) is an attractive route to extend the response of Si-based photodiodes into the near-infrared (NIR) region, so-called Schottky barrier diodes. Photons absorbed into a metallic nanostructure excite the surface plasmon resonances (SPRs), which can be damped non-radiatively through the creation of hot electrons. Unfortunately, quantum efficiency of hot electron detectors remains low due to low optical absorption and poor electron injection efficiency. In this study, we propose an efficient and low-cost plasmonic hot electron NIR photodetector based on Au nanoparticle (Au NP)-decorated Si pyramid Schottky junction...
May 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28530748/photomultiplication-type-narrowband-organic-photodetectors-working-at-forward-and-reverse-bias
#2
Jianli Miao, Fujun Zhang, Mingde Du, Wenbin Wang, Ying Fang
It is a great challenge to obtain narrowband and photomultiplication (PM) type organic photodetectors (OPDs) without optical filters due to the broad absorption range and large exciton binding energy of organic materials. Narrowband OPDs with the special structure of ITO/PFN-OX/P3HT : PC61BM (100 : 1,wt/wt)/Al were successfully fabricated with different active layer thicknesses, exhibiting a tunable response window and PM phenomenon under bi-directional bias. The OPDs exhibit U-shaped EQE spectra with two narrowband response windows under forward bias and a single narrowband response window under reverse bias...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28530232/tomographic-active-optical-trapping-of-arbitrarily-shaped-objects-by-exploiting-3d-refractive-index-maps
#3
Kyoohyun Kim, YongKeun Park
Optical trapping can manipulate the three-dimensional (3D) motion of spherical particles based on the simple prediction of optical forces and the responding motion of samples. However, controlling the 3D behaviour of non-spherical particles with arbitrary orientations is extremely challenging, due to experimental difficulties and extensive computations. Here, we achieve the real-time optical control of arbitrarily shaped particles by combining the wavefront shaping of a trapping beam and measurements of the 3D refractive index distribution of samples...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28527901/photonic-ring-resonance-is-a-versatile-platform-for-performing-multiplex-immunoassays-in-real-time
#4
Sasi Mudumba, Sophia de Alba, Randy Romero, Carli Cherwien, Alice Wu, Jue Wang, Martin A Gleeson, Muzammil Iqbal, Rufus W Burlingame
Photonic ring resonance is a property of light where in certain circumstances specific wavelengths are trapped in a ring resonator. Sensors based on silicon photonic ring resonators function by detecting the interaction between light circulating inside the sensor and matter deposited on the sensor surface. Binding of biological material results in a localized change in refractive index on the sensor surface, which affects the circulating optical field extending beyond the sensor boundary. That is, the resonant wavelength will change when the refractive index of the medium around the ring resonator changes...
May 17, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28527250/-risk-of-transmission-of-chagas-disease-by-intrusion-of-triatomines-and-wild-mammals-in-bucaramanga-santander-colombia
#5
Marlene Reyes, Ángela Torres, Lyda Esteban, Mónica Flórez, Víctor Manuel Angulo
INTRODUCTION: Notice of triatomines in dwellings of some neighborhoods in Bucaramanga motivated the realization of this study.Objetive: To evaluate the intrusion of triatomines and mammals, as well as some risk factors in urban dwellings. MATERIALS AND METHODS: Triatomines were collected in a neighborhood in Bucaramanga, Santander, on a monthly basis during one year with participation of the community. Collection included manual search in lamp posts, use of light traps, animal bait, and chemical attractants in nearby forests...
January 24, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28526567/synergistic-effects-of-polymyxin-and-ionic-liquids-on-lipid-vesicle-membrane-stability-and-aggregation
#6
Sylvia L Hanna, Jenny L Huang, Alana J Swinton, Gregory A Caputo, Timothy D Vaden
Ionic liquids (ILs) have been investigated for potential antibacterial and antibiotic applications due to their ability to destabilize and permeabilize the lipid bilayers in cell membranes. Bacterial assays have shown that combining ILs with antibiotics can provide a synergistic enhancement of their antibacterial activities. We have characterized the mechanism by which the conventional ILs 1-butyl-3-methylimidazolium chloride (BMICl) and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4) enhance the lipid membrane permeabilization of the well-known antibiotic polymyxin B (PMB)...
May 11, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28525618/establishing-expanding-and-certifying-a-closed-colony-of-phlebotomus-argentipes-diptera-psychodidae-for-xenodiagnostic-studies-at-the-kala-azar-medical-research-center-muzaffarpur-bihar-india
#7
Puja Tiwary, Shakti Kumar Singh, Anurag Kumar Kushwaha, Edgar Rowton, David Sacks, Om Prakash Singh, Shyam Sundar, Phillip Lawyer
This pilot project was preliminary and essential to a larger effort to define the ability of certain human-subject groups across the infection spectrum to serve as reservoirs of Leishmania donovani infection to sand flies in areas of anthroponotic transmission such as in Bihar state, India. This is possible only via xenodiagnosis of well-defined subject groups using live vector sand flies. The objective was to establish at the Kala Azar Medical Research Center (KAMRC), Muzaffarpur, Bihar, India, a self-sustaining colony of Phlebotomus argentipes (Annandale & Brunneti), closed to infusion with wild-caught material and certified safe for human xenodiagnosis...
May 19, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28515482/precise-and-diffraction-limited-waveguide-to-free-space-focusing-gratings
#8
Karan K Mehta, Rajeev J Ram
We present the design and characterization of waveguide grating devices that couple visible-wavelength light at λ = 674 nm from single-mode, high index-contrast dielectric waveguides to free-space beams forming micron-scale diffraction-limited spots a designed distance and angle from the grating. With a view to application in spatially-selective optical addressing, and in contrast to previous work on similar devices, deviations from the main Gaussian lobe up to 25 microns from the focus and down to the 5 × 10(-6) level in relative intensity are characterized as well; we show that along one dimension the intensity of these weak sidelobes approaches the limit imposed by diffraction from the finite field extent in the grating region...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28514847/electric-field-assisted-assembly-of-colloidal-particles-into-ordered-non-close-packed-arrays
#9
Jingjing Gong, Ning Wu
Non-close packed colloidal arrays have many potential applications ranging from plasmonic sensors, light trapping for photovoltaics, to transparent electrodes. However, scalable fabrication of those structures remains a challenge. In this paper, we investigate the robustness of an electric-field assisted approach systematically. A monolayer of non-close packed crystalline array is first created under a low-frequency alternating-current electric field in solution. We then apply a sequence of direct current pulses to fix the particle array onto the substrate so that it remains intact even after both field removal and solvent evaporation...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28513738/role-of-ni-in-hetero-architectured-nio-ni-composites-for-enhanced-catalytic-performance
#10
Sangeeta Adhikari, Giridhar Madras
A facile, one-step combustion synthesis in solution is reported for preparing hetero-architectured NiO/Ni nanocomposites using different organic fuels. The prepared nanocomposites were physicochemically characterized for crystal structure, functional groups, and morphology. It was found that the content of Ni in the nanocomposite varied due to different combustion fuels. A photocatalytic (PC) investigation of these nanocomposites was performed using rhodamine 6G (RG) under UV light. A citric acid combusted NiO/Ni (N-CA) composite containing 20% Ni phase showed the highest photoactivity in comparison to pure NiO due to its large porous channels and high surface area (∼28 ± 2 m(2) g(-1))...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28513721/programmable-micrometer-sized-motor-array-based-on-live-cells
#11
Shuangxi Xie, Xiaodong Wang, Niandong Jiao, Steve Tung, Lianqing Liu
Trapping and transporting microorganisms with intrinsic motility are important tasks for biological, physical, and biomedical applications. However, fast swimming speed makes the manipulation of these organisms an inherently challenging task. In this study, we demonstrated that an optoelectrical technique, namely, optically induced dielectrophoresis (ODEP), could effectively trap and manipulate Chlamydomonas reinhardtii (C. reinhardtii) cells swimming at velocities faster than 100 μm s(-1). Furthermore, live C...
May 17, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28513716/combining-light-harvesting-with-detachability-in-high-efficiency-thin-film-silicon-solar-cells
#12
Sanjay K Ram, Derese Desta, Rita Rizzoli, Michele Bellettato, Folmer Lyckegaard, Pia B Jensen, Bjarke R Jeppesen, Jacques Chevallier, Caterina Summonte, Arne Nylandsted Larsen, Peter Balling
Efforts to realize thin-film solar cells on unconventional substrates face several obstacles in achieving good energy-conversion efficiency and integrating light-management into the solar cell design. In this report a technique to circumvent these obstacles is presented: transferability and an efficient light-harvesting scheme are combined for thin-film silicon solar cells by the incorporation of a NaCl layer. Amorphous silicon solar cells in p-i-n configuration are fabricated on reusable glass substrates coated with an interlayer of NaCl...
May 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28513134/silicon-quantum-dots-in-dielectric-scattering-media-broadband-enhancement-of-effective-absorption-cross-section-by-light-trapping
#13
Hiroshi Sugimoto, Yusuke Ozaki, Minoru Fujii
We report strong enhancements of the effective absorption cross-section and photoluminescence (PL) intensity of silicon quantum dots (Si QDs) with 2.8-6.8 nm in diameter in a highly scattering dielectric medium. The scattering medium is a polymer thin film with submicron size pores inside, supporting the resonant cavity modes in the visible range. By the scattering associated with the cavity modes, efficient light trapping into a polymer film with ~1 µm in thickness is achieved, which leads to 30-40 times enhancement of the effective absorption cross-section of embedded Si QDs in a green-red wavelength range...
May 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28512035/the-predatory-behavior-of-the-neotropical-social-wasp-polybia-rejecta
#14
Alain Dejean, Héctor Rodríguez-Pérez, James M Carpenter, Frédéric Azémar, Bruno Corbara
We experimentally studied the predatory behavior of Polybia rejecta (Vespidae, Polistinae, Epiponini) towards 2-88 mm-long insects attracted to a UV light trap. Foragers, which began to hunt at 6:30, selected 4-14 mm-long prey insects. Prey detection by sight by hovering wasps was confirmed using decoys. After the wasps landed and walked along a sinuous path, prey were detected by contact or from a distance (1-3cm). This was followed by seizure, stinging (contrarily to most other known cases), prey manipulation and retrieval...
May 13, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28511100/dahlia-shaped-bioclxi1-x-structures-prepared-by-a-facile-solid-state-method-evidence-and-mechanism-of-improved-photocatalytic-degradation-of-rhodamine-b-dye
#15
Jing Xie, Yali Cao, Dianzeng Jia, Yizhao Li
A rapid and cheap solid-state chemical process was employed to synthesize BiOClxI1-x (x=1.0, 0.75, 0.5, 0.25, 0) solid solutions with dahlia-shaped hierarchitectures. The dahlia-shaped BiOClxI1-x hierarchitectures were effectively constructed by nanoplates with a thickness about 5-13nm. The band gap structure of the solid solutions can be modulated by adjusting the composition ratio of Cl and I, which has a significant effect on the photocatalytic activity of the solid solutions. The dahlia-shaped BiOClxI1-x (x=0...
May 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28509619/japanese-encephalitis-virus-infection-rate-and-detection-of-genotype-i-from-culex-tritaeniorhynchus-collected-from-jiangsu-china
#16
Hongliang Chu, Zhiming Wu, Hongna Chen, Chunxiao Li, Xiaoxia Guo, Ran Liu, Gang Wang, Minghao Zhou, Tongyan Zhao
Information regarding the infection rate and genotype shifts for Japanese encephalitis virus (JEV) are important for JE vaccine application. In Jiangsu province, China, which is one of the provinces with a high prevalence of JE, JEV infection in swine and mosquitoes in certain cities has only been investigated in 2008-2009. Lianyungang City has one of the highest numbers of JE cases in Jiangsu province, and it has a high risk of JEV invasion via migrant birds. JEV infection in vectors in Lianyungang City, which has urban and rural parts, has not been investigated...
May 16, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28508745/natural-leishmania-viannia-infections-of-phlebotomines-diptera-psychodidae-indicate-classical-and-alternative-transmission-cycles-of-american-cutaneous-leishmaniasis-in-the-guiana-shield-brazil
#17
Adelson Alcimar Almeida de Souza, Iorlando da Rocha Barata, Maria das Graças Soares Silva, José Aprígio Nunes Lima, Yara Lúcia Lins Jennings, Edna Aoba Yassui Ishikawa, Ghislaine Prévot, Marine Ginouves, Fernando Tobias Silveira, Jeffrey Shaw, Thiago Vasconcelos Dos Santos
From 1996 to 1999 multi-trapping methods (Center of Diseases Control, CDC) light traps, light-baited Shannon traps, and aspiration on tree bases) were used to study the phlebotomine fauna of the "Serra do Navio" region of the Brazilian State of Amapá, which is part of the Guiana Shield. Fifty-three species were identified among 8,685 captured individuals. The following species, associated with the transmission of American cutaneous leishmaniasis in Amazonian Brazil, were captured: Nyssomyia umbratilis (3,388), Psychodopygus squamiventris maripaensis (995), Ny...
2017: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/28507667/photoacoustic-probes-for-real-time-tracking-of-endogenous-h2s-in-living-mice
#18
Ben Shi, Xianfeng Gu, Qiang Fei, Chunchang Zhao
H2S is a key chemical mediator that exerts a vital role in diverse physiological and pathological processes. However, in vivo tracking of endogenous H2S generation still remains difficult due to the lack of reliable analytical methods. Herein, we present the first example of activatable photoacoustic probes for real-time imaging of H2S in living mice through the full utilization of the superiority of photoacoustic imaging modality at fine spatial resolution during deep tissue penetration. The designed probe can generate high NIR absorption at 780 nm in the presence of H2S, thus producing a strong photoacoustic signal output in the NIR region...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28506069/interplay-between-adsorbed-peptide-structure-trapped-water-and-surface-hydrophobicity
#19
Katherine D Krause, Sandra Roy, Dennis K Hore
Atomistic molecular dynamics simulations were used to study the influence of interfacial water on the orientation and conformation of a facewise amphipathic α-helical peptide adsorbed to hydrophilic and hydrophobic substrates. Water behavior beneath the peptide adsorbed to a hydrophilic surface was observed to vary with the height of the peptide above the surface. In general, the orientation of water close to the peptide (with the oxygen atom pointing up toward the peptide) was complementary to that observed near the hydrophilic surface in the absence of peptide...
May 15, 2017: Biointerphases
https://www.readbyqxmd.com/read/28505274/migration-analysis-of-sogatella-furcifera-hemiptera-delphacidae-in-the-northeastern-hunan-province-in-june
#20
Mingyong Ma, Yan Wu, Zhaopu Peng, Xin Zhao, Yi Zhang, Guoan Liao, Baoping Zhai
The Sogatella furcifera (Horváth) is a notorious and destructive insect pest, targeting >4 million hectares of rice cultivated in the Hunan Province. To understand the immigration dynamics, we collected S. furcifera light trap catches from 2006 to 2012 at Niangxiang, Linxiang, and Hanshou. We conducted a migration analysis to estimate the immigration source for the northeastern Hunan Province in June. Moreover, we dissected the ovaries of S. furcifera to classify population characteristics. We found that the first appearance of S...
May 13, 2017: Environmental Entomology
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