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Energy harvester

Simon Cerfontaine, Lionel Marcélis, Baptiste Laramee-Milette, Garry S Hanan, Frédérique Loiseau, Julien De Winter, Pascal Gerbaux, Benjamin Elias
Ruthenium-based complexes are widely used as photocatalysts, as photosensitizers, or as building blocks for supramolecular assemblies. In the field of solar energy conversion, building light harvesting antenna is of prime interest. Nevertheless, collecting light is mandatory but not sufficient; once collected and transferred, the exciton has to be long-lived enough to be transferred to a catalytic site. If Ru(II) terpyridine complexes are prime building blocks for structural reasons, the short lifetime of their excited state prevents their use as a harvesting center in light antennae...
February 21, 2018: Inorganic Chemistry
Dvir Harris, Shira Bar-Zvi, Avital Lahav, Itay Goldshmid, Noam Adir
Light absorption is the initial step in the photosynthetic process. In all species, most of the light is absorbed by dedicated pigment-protein complexes called light harvesting complexes or antenna complexes. In the case of cyanobacteria and red-algae, photosynthetic organisms found in a wide variety of ecological niches, the major antenna is called the Phycobilisome (PBS). The PBS has many unique characteristics that sets it apart from the antenna complexes of other organisms (bacteria, algae and plants). These differences include the type of light absorbing chromophores, the protein environment of the chromophores, the method of assembly and association and the intercellular location with respect to the photosynthetic reaction centers (RCs)...
2018: Sub-cellular Biochemistry
Jonathan D Packer, Wen-Teh Chang, Jason L Dragoo
Background: Adipose-derived stem cell (ADSC)-based treatments have the potential to treat numerous soft-tissue pathologies. It would be beneficial to develop an efficient and reliable intraoperative, nonenzymatic method of isolating ADSCs for clinical use. This study aims to determine the (1) viability and proliferative capacity of ADSCs after exposure to vibrational energies and (2) efficacy of vibrational energy as a method of ADSC isolation from surgically harvested infrapatellar fat pad (IFP)...
January 2018: Plastic and Reconstructive Surgery. Global Open
Lampan Khurnpoon, Panmanas Sirisomboon
The near infrared (NIR) spectroscopy as the rapid non-destructive method was aimed to be applied for determination of the texture properties of melon intact fruit and pulp including initial firmness, rupture force, average firmness, rupture distance, toughness, average penetrating force and penetrating energy. The data from the reference method of texture analyzer was correlated with the NIR spectral data. The result showed that, only the two properties including rupture force and penetrating force in pulp could be predicted by NIR spectroscopy technique...
February 20, 2018: Journal of Texture Studies
Paul Fourmont, Luis-Felipe Gerlein, Francois-Xavier Fortier, Sylvain G Cloutier, Riad Nechache
Thermoelectric Bi2Te3 and Sb2Te3 thin films with high power factor were successfully obtained by pulsed laser deposition (PLD). Here we demonstrate a well-controlled deposition of Bi2Te3/Sb2Te3 structures on glass substrates, through a shadow mask with micrometer scale features. We stablish an optimal growth temperature of 45 °C to attain compounds with suitable stoichiometric composition, structural and electrical properties, to achieve high thermoelectric power factor. These films are produced without additional post-annealing treatment or added gasses...
February 20, 2018: ACS Applied Materials & Interfaces
Vasco Giovagnetti, Guangye Han, Maxwell A Ware, Petra Ungerer, Xiaochun Qin, Wen-Da Wang, Tingyun Kuang, Jian-Ren Shen, Alexander V Ruban
The macroalga Bryopsis corticulans relies on a sustained protective NPQ and a peculiar body architecture to efficiently adapt to the extreme light changes of intertidal shores. During low tides, intertidal algae experience prolonged high light stress. Efficient dissipation of excess light energy, measured as non-photochemical quenching (NPQ) of chlorophyll fluorescence, is therefore required to avoid photodamage. Light-harvesting regulation was studied in the intertidal macroalga Bryopsis corticulans, during high light and air exposure...
February 19, 2018: Planta
Albert Collins Nganou Assonkeng, Noam Adir, Martin Mkandawire
Understanding of electronic energy transition (EET) mechanisms from the light-harvesting unit to the reaction centre in a natural system has been limited by; (a) the use of conventional transient time-resolved spectroscopy at room temperature, which result in high signal-to-noise ratio; and (b) examining extracts instead of intact light-harvesting units. Here, we report previously unknown differences and new insight in EET of two cyanobacteria species, Acaryochloris marina and Thermosynechoccocus vulvanus, which have been found only after using Uv-vis, hole-burning and fluorescence spectroscopy at ultra-low temperature and examining their intact light-harvesting unit, phycobilisomes (PBS)...
February 19, 2018: Journal of Physical Chemistry. B
Tianhuan Peng, Junjian Miao, Zhaoshuai Gao, Linjuan Zhang, Yi Gao, Chunhai Fan, Di Li
Surface plasmon resonance of coinage metal nanoparticles is extensively exploited to promote catalytic reactions via harvesting solar energy. Previous efforts on elucidating the mechanisms of enhanced catalysis are devoted to hot electron-induced photothermal conversion and direct charge transfer to the adsorbed reactants. However, little attention is paid to roles of hot holes that are generated concomitantly with hot electrons. In this work, 13 nm spherical Au nanoparticles with small absorption cross-section are employed to catalyze a well-studied glucose oxidation reaction...
February 19, 2018: Small
Jianan Deng, Xiao Kuang, Ruiyuan Liu, Wenbo Ding, Aurelia C Wang, Ying-Chih Lai, Kai Dong, Zhen Wen, Yaxian Wang, Lili Wang, H Jerry Qi, Tong Zhang, Zhong Lin Wang
Functional polymers possess outstanding uniqueness in fabricating intelligent devices such as sensors and actuators, but they are rarely used for converting mechanical energy into electric power. Here, a vitrimer based triboelectric nanogenerator (VTENG) is developed by embedding a layer of silver nanowire percolation network in a dynamic disulfide bond-based vitrimer elastomer. In virtue of covalent dynamic disulfide bonds in the elastomer matrix, a thermal stimulus enables in situ healing if broken, on demand reconfiguration of shape, and assembly of more sophisticated structures of VTENG devices...
February 19, 2018: Advanced Materials
Xin Ning, Heling Wang, Xinge Yu, Julio A N T Soares, Zheng Yan, Kewang Nan, Gabriel Velarde, Yeguang Xue, Rujie Sun, Qiyi Dong, Haiwen Luan, Chan Mi Lee, Aditya Chempakasseril, Mengdi Han, Yiqi Wang, Luming Li, Yonggang Huang, Yihui Zhang, John Rogers
Microelectromechanical systems remain an area of significant interest in fundamental and applied research due to their wide ranging applications. Most device designs, however, are largely two-dimensional and constrained to only a few simple geometries. Achieving tunable resonant frequencies or broad operational bandwidths requires complex components and/or fabrication processes. The work presented here reports unusual classes of three-dimensional (3D) micromechanical systems in the form of vibratory platforms assembled by controlled compressive buckling...
April 11, 2017: Advanced Functional Materials
Rajeswari Ponnusamy, Brahmananda Chakraborty, Chandra Sekhar Rout
Herein, we report the results of crystal structure dependent non-enzymatic glucose sensing properties of tungsten oxide (WO3) and Pd doped WO3 nanostructures. WO3 nanomaterials with orthorhombic, monoclinic and mixed (ortho+monoclinic) phases were harvested by a facile hydrothermal route by varying the reaction time and subsequent annealing processes. Electrocatalytic activity tests of WO3 samples revealed three-fold oxidation peak current enhancement in monoclinic Pd-doped WO3 nanobricks assembly as compared to the orthorhombic WO3 microspheres...
February 19, 2018: Journal of Physical Chemistry. B
Marta Pogrzeba, Szymon Rusinowski, Jacek Krzyżak
Heavy metals (HMs) contamination of soils is a major problem occurring worldwide. Utility of energy crops for biofuel feedstock production systems offers a feasible solution for a commercial exploitation of an arable land contaminated with HMs. Experiments involved field testing of Miscanthus x giganteus and Spartina pectinata cultivated on HMs-contaminated soil with standard NPK fertilizers and commercially available microbial inoculum. Biomass yield, water content, macronutrients (N, P, K, Mg, Ca), and heavy metal (Cd, Pb, Zn) concentrations in plant shoots were assessed at the end of the first and the second growing season...
February 16, 2018: Environmental Science and Pollution Research International
Zixuan Hu, Gregory S Engel, Fahhad H Alharbi, Sabre Kais
Natural light harvesting systems exploit electronic coupling of identical chromophores to generate efficient and robust excitation transfer and conversion. Dark states created by strong coupling between chromophores in the antenna structure can significantly reduce radiative recombination and enhance energy conversion efficiency. Increasing the number of the chromophores increases the number of dark states and the associated enhanced energy conversion efficiency yet also delocalizes excitations away from the trapping center and reduces the energy conversion rate...
February 14, 2018: Journal of Chemical Physics
Piyush Kanti Sarkar, Subrata Maji, Somobrata Acharya
We report on a flexible triboelectric nanogenerator (FTENG) designed using polydimethylsiloxane (PDMS) and aluminium (Al) combinations to convert ambient mechanical energy into electrical outputs. An open-circuit output voltage of ~40 V and short-circuit current density of ~63.6 mA m-2 with power density 0.62 W m-2 was easily obtained from the FTENG. The harvested mechanical energy is used for lighting ~100 light emitting diodes and to operate seven segment display enabling prospects for carbon-emission free environment friendly source for powering portable electronic devices...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Liguo Wei, Shishan Chen, Yulin Yang, Yongli Dong, Weina Song, Ruiqin Fan
Graphene has attracted a lot of attention because of its unique mechanical, thermal, electrical and optical properties. In this study, a double layered structured photoanode consisting of a graphene/TiO2 composite layer and a TiO2 nanoparticles (P25) underlayer was developed. The photoelectric properties of as-prepared double layer structured photoanode were studied with comparison of the anatase TiO2 photoanode. Graphene was prepared by reduction of graphene oxide (GO) under a hydrothermal conditions and graphenen/TiO2 composite semiconductor materials were prepared by mixing graphene into TiO2 paste...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Daehoon Park, Sung-Ho Shin, Ick-Jae Yoon, Junghyo Nah
We report packaged triboelectric nanogenerators (TENGs) fabricated with ferroelectric nanoparticles (NPs) embedded sponge created by using sugar powder as a sacrificial template. Here, the sponge structure provides a minimal separation gap necessary for triboelectric induction and resilience during detachment between two contacted surfaces. Besides, excellent mechanical durability is obtained due to decent elasticity and flexibility of the sponge structure. Ferroelectric BaTiO3 NPs embedded in a sponge structure contributes to increased output voltage and current by increasing surface charge density by spontaneous dipole and permittivity modulation...
February 15, 2018: Nanotechnology
Anton L Cottrill, Albert Tianxiang Liu, Yuichiro Kunai, Volodymyr B Koman, Amir Kaplan, Sayalee G Mahajan, Pingwei Liu, Aubrey R Toland, Michael S Strano
Materials science has made progress in maximizing or minimizing the thermal conductivity of materials; however, the thermal effusivity-related to the product of conductivity and capacity-has received limited attention, despite its importance in the coupling of thermal energy to the environment. Herein, we design materials that maximize the thermal effusivity by impregnating copper and nickel foams with conformal, chemical-vapor-deposited graphene and octadecane as a phase change material. These materials are ideal for ambient energy harvesting in the form of what we call thermal resonators to generate persistent electrical power from thermal fluctuations over large ranges of frequencies...
February 14, 2018: Nature Communications
Alexander Pieper, Manuel Hohgardt, Maximilian Willich, Daniel Alexander Gacek, Nour Hafi, Dominik Pfennig, Andreas Albrecht, Peter Jomo Walla
Efficient sunlight harvesting and re-directioning onto small areas has great potential for more widespread use of precious high-performance photovoltaics but so far intrinsic solar concentrator loss mechanisms outweighed the benefits. Here we present an antenna concept allowing high light absorption without high reabsorption or escape-cone losses. An excess of randomly oriented pigments collects light from any direction and funnels the energy to individual acceptors all having identical orientations and emitting ~90% of photons into angles suitable for total internal reflection waveguiding to desired energy converters (funneling diffuse-light re-directioning, FunDiLight)...
February 14, 2018: Nature Communications
Yuqiang Liu, Na Sun, Jiawei Liu, Zhen Wen, Xuhui Sun, Shuit-Tong Lee, Baoquan Sun
Solar cells, as promising devices for converting light into electricity, dramatically reduce its performance in rainy day. Here, an energy harvesting structure that integrates a solar cell and a triboelectric nanogenerator (TENG) device is built to realize power generation from both sunlight and raindrop. A heterojunction silicon (Si) solar cell is integrated with a TENG by a mutual electrode of a poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) film. Regarding to the solar cell, imprinted PEDOT:PSS is used to reduce the light reflection, which leads to an enhanced short current density...
February 14, 2018: ACS Nano
Anna L Hagstrom, Hak-Lae Lee, Myung-Soo Lee, Hyun-Seok Choe, Joori Jung, Byung-Geon Park, Won-Sik Han, Jong Soo Ko, Jae-Hong Kim, Jaehyuk Kim
Triplet-triplet annihilation upconversion (TTA-UC) has recently drawn widespread interest for its capacity to harvest low-energy photons and to broaden the absorption spectra of photonic devices such as solar cells. Although conceptually promising, effective integration of TTA-UC materials into practical devices has been difficult due to the diffusive and anoxic conditions required in TTA-UC host media. Of the solid-state host materials investigated, rubbery polymers facilitate the highest TTA-UC efficiencies...
February 14, 2018: ACS Applied Materials & Interfaces
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