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https://www.readbyqxmd.com/read/28644643/first-demonstration-of-a-scintillating-xenon-bubble-chamber-for-detecting-dark-matter-and-coherent-elastic-neutrino-nucleus-scattering
#1
D Baxter, C J Chen, M Crisler, T Cwiok, C E Dahl, A Grimsted, J Gupta, M Jin, R Puig, D Temples, J Zhang
A 30-g xenon bubble chamber, operated at Northwestern University in June and November 2016, has for the first time observed simultaneous bubble nucleation and scintillation by nuclear recoils in a superheated liquid. This chamber is instrumented with a CCD camera for near-IR bubble imaging, a solar-blind photomultiplier tube to detect 175-nm xenon scintillation light, and a piezoelectric acoustic transducer to detect the ultrasonic emission from a growing bubble. The time of nucleation determined from the acoustic signal is used to correlate specific scintillation pulses with bubble-nucleating events...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28644559/evaluating-dihydroazulene-vinylheptafulvene-photoswitches-for-solar-energy-storage-applications
#2
Zhihang Wang, Jonas Udmark, Karl Börjesson, Rita Rodrigues, Anna Roffey, Maria Abrahamsson, Mogens B Nielsen, Kasper Moth-Poulsen
Efficient solar energy storage is a key challenge in striving towards a sustainable future. For this reason, molecules capable of solar energy storage and release through valence isomerization, so-called Molecular Solar Thermal energy storage (MOST), have been investigated. Here, we evaluate the energy storage potential through the photoconversion of the dihydroazulene-vinylheptafulvene (DHA/VHF) photo-thermal couple. The robust nature of this system has been determined through multiple energy storage and release cycles at elevated temperatures in three different solvents...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28644493/photoelectrochemical-devices-for-solar-water-splitting-materials-and-challenges
#3
Chaoran Jiang, Savio J A Moniz, Aiqin Wang, Tao Zhang, Junwang Tang
It is widely accepted within the community that to achieve a sustainable society with an energy mix primarily based on solar energy we need an efficient strategy to convert and store sunlight into chemical fuels. A photoelectrochemical (PEC) device would therefore play a key role in offering the possibility of carbon-neutral solar fuel production through artificial photosynthesis. The past five years have seen a surge in the development of promising semiconductor materials. In addition, low-cost earth-abundant co-catalysts are ubiquitous in their employment in water splitting cells due to the sluggish kinetics of the oxygen evolution reaction (OER)...
June 23, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28644463/hypersensitive-dual-function-luminescence-switching-of-a-silver-chalcogenolate-cluster-based-metal-organic-framework
#4
Ren-Wu Huang, Yong-Sheng Wei, Xi-Yan Dong, Xiao-Hui Wu, Chen-Xia Du, Shuang-Quan Zang, Thomas C W Mak
Silver(i) chalcogenide/chalcogenolate clusters are promising photofunctional materials for sensing, optoelectronics and solar energy harvesting applications. However, their instability and poor room-temperature luminescent quantum yields have hampered more extensive study. Here, we graft such clusters to adaptable bridging ligands, enabling their interconnection and the formation of rigid metal-organic frameworks. By controlling the spatial separation and orientation of the clusters, they then exhibit enhanced stability (over one year) and quantum yield (12...
July 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28643895/light-switchable-azobenzene-containing-macromolecules-from-uv-to-near-infrared
#5
REVIEW
Philipp Weis, Si Wu
Azobenzene-containing macromolecules (azo-macromolecules) such as azobenzene-containing polymers (azopolymers) and azobenzene-functionalized biomacromolecules are photoswitchable macromolecules. Trans-to-cis photoisomerization in conventional azo-macromolecules is induced by ultraviolet (UV) light. However, UV light cannot penetrate deeply into issue and has a very small fraction in sunlight. Therefore, conventional azo-macromolecules are problematic for biomedical and solar-energy-related applications. In this Feature Article, the strategies for constructing visible and near-infrared (NIR) light-responsive azo-macromolecules are reviewed, and the potential applications of visible- and NIR-light-responsive azo-macromolecules in biomedicine and solar energy conversion are highlighted...
June 23, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28643082/the-influence-of-solar-power-plants-on-microclimatic-conditions-and-the-biotic-community-in-chilean-desert-environments
#6
Anna Suuronen, Christian Muñoz-Escobar, Anssi Lensu, Markku Kuitunen, Natalia Guajardo Celis, Pablo Espinoza Astudillo, Marcos Ferrú, Andrés Taucare-Ríos, Marcelo Miranda, Jussi V K Kukkonen
The renewable energy sector is growing at a rapid pace in northern Chile and the solar energy potential is one of the best worldwide. Therefore, many types of solar power plant facilities are being built to take advantage of this renewable energy resource. Solar energy is considered a clean source of energy, but there are potential environmental effects of solar technology, such as landscape fragmentation, extinction of local biota, microclimate changes, among others. To be able to minimize environmental impacts of solar power plants, it is important to know what kind of environmental conditions solar power plants create...
June 22, 2017: Environmental Management
https://www.readbyqxmd.com/read/28643046/clinical-evaluation-of-the-efficacy-and-safety-of-combined-bipolar-radiofrequency-and-optical-energies-vs-optical-energy-alone-for-the-treatment-of-aging-hands
#7
Ines Verner, Tuvia Dror Kutscher
Different treatment modalities are used for the treatment and esthetic improvement of aging hands. This study evaluated the efficacy and safety of a novel technology, which combines bipolar radio frequency (RF) and optical energies for the cosmetic treatment of aging hands. The objective of the study was to assess the efficacy, safety, tolerability, and patient satisfaction of combined bipolar radiofrequency and optical energies vs. optical energy alone for the treatment of aging hands. Thirteen female patients with solar lentigines on the back of the hands were enrolled...
June 23, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28640637/designing-transmitter-ligands-that-mediate-energy-transfer-between-semiconductor-nanocrystals-and-molecules
#8
Zhiyuan Huang, Ming Lee Tang
Molecular control of energy transfer is an attractive proposition because it allows chemists to synthetically tweak various kinetic and thermodynamic factors. In this Perspective, we examine energy transfer between semiconductor nano-crystals (NCs) and π-conjugated molecules, focusing on the transmitter ligand at the organic-inorganic interface. Efficient transfer of triplet excitons across this interface allows photons to be directed for effective use of the entire solar spectrum. For example, a photon upconversion system composed of semiconductor NCs as sensitizers, bound organic ligands as transmitters, and molecular annihilators has the advantage of large, tunable absorption cross-sections across the visible and near infrared wavelengths...
June 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28640386/photoresponsive-smart-coloration-electrochromic-supercapacitor
#9
Tae Gwang Yun, Donghyuk Kim, Yong Ho Kim, Minkyu Park, Seungmin Hyun, Seung Min Han
Electrochromic devices have been widely adopted in energy saving applications by taking advantage of the electrode coloration, but it is critical to develop a new electrochromic device that can undergo smart coloration and can have a wide spectrum in transmittance in response to input light intensity while also functioning as a rechargeable energy storage system. In this study, a photoresponsive electrochromic supercapacitor based on cellulose-nanofiber/Ag-nanowire/reduced-graphene-oxide/WO3 -composite electrode that is capable of undergoing "smart" reversible coloration while simultaneously functioning as a reliable energy-storage device is developed...
June 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28639652/probing-single-molecule-electron-hole-transfer-dynamics-at-a-molecule-nio-semiconductor-nanocrystalline-interface
#10
Bharat Dhital, Vishal Govind Rao, H Peter Lu
Interfacial charge transfer dynamics in dye-sensitized NiO nanoparticles are being investigated for photocathodes in p-type dye-sensitized solar cells. In the photoreaction, after fast electron transfer from NiO to a molecule, the recombination of the hole in the nanoparticles with the electron in a reduced molecule plays an important role in the charge separation process and solar energy harvesting. Nevertheless, knowledge of the interfacial charge recombination (CR) rate and its mechanism is still limited due to the complex photoinduced electron and hole dynamics and lack of characterization of the inhomogeneity of the dynamics...
June 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28638150/strain-balanced-type-ii-superlattices-for-efficient-multi-junction-solar-cells
#11
A Gonzalo, A D Utrilla, D F Reyes, V Braza, J M Llorens, D Fuertes Marrón, B Alén, T Ben, D González, A Guzman, A Hierro, J M Ulloa
Multi-junction solar cells made by assembling semiconductor materials with different bandgap energies have hold the record conversion efficiencies for many years and are currently approaching 50%. Theoretical efficiency limits make use of optimum designs with the right lattice constant-bandgap energy combination, which requires a 1.0-1.15 eV material lattice-matched to GaAs/Ge. Nevertheless, the lack of suitable semiconductor materials is hindering the achievement of the predicted efficiencies, since the only candidates were up to now complex quaternary and quinary alloys with inherent epitaxial growth problems that degrade carrier dynamics...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28635273/a-direct-bandgap-copper-antimony-halide-perovskite
#12
Brenda Vargas, Estrella Ramos, Enrique Pérez-Gutiérrez, Juan C Alonso, Diego Solis-Ibarra
Since the establishment of perovskite solar cells (PSCs) there has been an intense search for alternative materials to replace lead and improve their stability towards moisture and light. As single-metal perovskite structures have yielded unsatisfactory performances, an alternative is the use of double perovskites that incorporate a combination of metals. To this day, only a handful of these compounds have been synthesized, but most of them have indirect bandgaps and/or do not have bandgaps energies well-suited for photovoltaic applications...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28635079/oxygen-vacancy-mediated-photocatalysis-of-biocl-reactivity-selectivity-and-perspective
#13
Hao Li, Jie Li, Zhihui Ai, Falong Jia, Lizhi Zhang
Semiconductor photocatalysis is a trustworthy approach to harvest clean solar light for energy conversions, while state-of-the-art catalytic efficiencies are unsatisfactory because of the finite light response and/or robust charge carriers' recombination. Along with the development of modern material characterization techniques and electronic-structure computations, oxygen vacancies (OVs) on real photocatalysts surface, even in infinitesimal concentration, are found to play a more decisive role in determining the kinetics, energetics and mechanisms of photocatalytic reactions...
June 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28633823/sono-synthesis-of-solar-light-responsive-s-n-c-tri-doped-tio2-photo-catalyst-under-optimized-conditions-for-degradation-and-mineralization-of-diclofenac
#14
Sara Ramandi, Mohammad H Entezari, Narjes Ghows
C-N-S-tri doped TiO2 anatase phase was synthesized using a facile, effective and novel sonochemical method at low frequency (20kHz) and at room temperature. Titanium butoxide as the titanium precursor and thiourea as the dopant source were used in the synthesis of the photo-catalyst. The effects of important parameters such as thiourea/Ti molar ratio, ultrasound intensity, sonication time and temperature were studied on the synthesis of tri-doped TiO2. The XPS results confirmed the presence of N, S, and C in the photo-catalyst...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28630353/evaluation-of-a-proposal-for-reliable-low-cost-grid-power-with-100-wind-water-and-solar
#15
Christopher T M Clack, Staffan A Qvist, Jay Apt, Morgan Bazilian, Adam R Brandt, Ken Caldeira, Steven J Davis, Victor Diakov, Mark A Handschy, Paul D H Hines, Paulina Jaramillo, Daniel M Kammen, Jane C S Long, M Granger Morgan, Adam Reed, Varun Sivaram, James Sweeney, George R Tynan, David G Victor, John P Weyant, Jay F Whitacre
A number of analyses, meta-analyses, and assessments, including those performed by the Intergovernmental Panel on Climate Change, the National Oceanic and Atmospheric Administration, the National Renewable Energy Laboratory, and the International Energy Agency, have concluded that deployment of a diverse portfolio of clean energy technologies makes a transition to a low-carbon-emission energy system both more feasible and less costly than other pathways. In contrast, Jacobson et al. [Jacobson MZ, Delucchi MA, Cameron MA, Frew BA (2015) Proc Natl Acad Sci USA 112(49):15060-15065] argue that it is feasible to provide "low-cost solutions to the grid reliability problem with 100% penetration of WWS [wind, water and solar power] across all energy sectors in the continental United States between 2050 and 2055", with only electricity and hydrogen as energy carriers...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28630307/nanophotonics-enabled-solar-membrane-distillation-for-off-grid-water-purification
#16
Pratiksha D Dongare, Alessandro Alabastri, Seth Pedersen, Katherine R Zodrow, Nathaniel J Hogan, Oara Neumann, Jinjian Wu, Tianxiao Wang, Akshay Deshmukh, Menachem Elimelech, Qilin Li, Peter Nordlander, Naomi J Halas
With more than a billion people lacking accessible drinking water, there is a critical need to convert nonpotable sources such as seawater to water suitable for human use. However, energy requirements of desalination plants account for half their operating costs, so alternative, lower energy approaches are equally critical. Membrane distillation (MD) has shown potential due to its low operating temperature and pressure requirements, but the requirement of heating the input water makes it energy intensive. Here, we demonstrate nanophotonics-enabled solar membrane distillation (NESMD), where highly localized photothermal heating induced by solar illumination alone drives the distillation process, entirely eliminating the requirement of heating the input water...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28627165/room-temperature-processed-nb2o5-as-the-electron-transporting-layer-for-efficient-planar-perovskite-solar-cells
#17
Xufeng Ling, Jianyu Yuan, Dongyang Liu, Yongjie Wang, Yannan Zhang, Si Chen, Haihua Wu, Feng Jin, Fu-Peng Wu, Guozheng Shi, Xun Tang, Jiawei Zheng, Shengzhong Frank Liu, Zhike Liu, Wanli Ma
In this work , we demonstrate high-efficiency planar perovskite solar cells (PSCs) using room-temperature sputtered niobium oxide (Nb2O5) as the electron transporting layer (ETL). Widely spread ETL like TiO2 often requires high-temperature (> 450 ºC) sintering, which is not desired for the fabrication of flexible devices. The as sputtered amorphous Nb2O5 ETL (labeled as a-Nb2O5) without any heat treatment can lead to a best power conversion efficiency (PCE) of 17.1% for planar PSCs. Interestingly, the crystalline Nb2O5 (labeled as c-Nb2O5) with high-temperature (500 ºC) annealing results in very similar PCE of 17...
June 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28622651/application-of-electroencephalographic-techniques-to-the-study-of-visual-impact-of-renewable-energies
#18
M D Grima Murcia, Francisco Sánchez Ferrer, Jennifer Sorinas, J M Ferrandez, Eduardo Fernandez
Much is currently being studied on the negative visual impact associated to the installation of large wind turbines or photovoltaic farms. However, methodologies for quantitatively assessing landscape impact are scarce. In this work we used electroencephalographic (EEG) recordings to investigate the brain activity of 14 human volunteers when looking at the same landscapes with and without wind turbines, solar panels and nuclear power plants. Our results showed no significant differences for landscapes with solar power systems or without them, and the same happened for wind turbines, what was in agreement with their subjective scores...
June 13, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28621356/dye-sensitized-lanthanide-doped-upconversion-nanoparticles
#19
Xindong Wang, Rashid R Valiev, Tymish Y Ohulchanskyy, Hans Ågren, Chunhui Yang, Guanying Chen
Lanthanide-doped upconversion nanoparticles (UCNPs) are promising for applications as wide as biological imaging, multimodal imaging, photodynamic therapy, volumetric displays, and solar cells. Yet, the weak and narrow absorption of lanthanide ions poses a fundamental limit of UCNPs to withhold their brightness, creating a long-standing hurdle for the field. Dye-sensitized UCNPs are emerging to address this performance-limiting problem, yielding up to thousands-fold brighter luminescence than conventional UCNPs without dye sensitization...
June 16, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28621130/loading-cd0-5zn0-5s-qds-onto-onion-like-carbon-nanoparticles-to-boost-photocatalytic-hydrogen-generation
#20
Xiaolong Zhou, Xina Wang, Xi Feng, Kun Zhang, Xiaoniu Peng, Hanbin Wang, Chunlei Liu, Yibo Han, Hao Wang, Quan Li
Carbon dots (size <10 nm) have been conventionally decorated onto semiconductor matrix for photocatalytic H2 evolution, but the efficiency is largely limited by the low loading ratio of C dots on the photocatalyst. Here, we propose an inverse structure of Cd0.5Zn0.5S quantum dots (QDs) loaded onto onion-like carbon (OLC) matrix for noble metal-free photocatalytic H2 evolution. 6.9 nm-sized Cd0.5Zn0.5S QDs were uniformly distributed on 30 nm OLC with both up-converted and down-converted PL property. Such inverse structure allows full optimization of the QD-OLC interfaces for effective energy transfer and charge separation, both of which contribute to the efficient H2 generation...
June 16, 2017: ACS Applied Materials & Interfaces
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