Relevant bibliographies by topics / Nanomaterials - Light Harvesting Systems

Academic literature on the topic 'Nanomaterials - Light Harvesting Systems'

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Published: 7 September 2023

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Journal articles on the topic "Nanomaterials - Light Harvesting Systems"

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Maity, Arunava, Ananta Dey, Monalisa Gangopadhyay, and Amitava Das. "Water induced morphological transformation of a poly(aryl ether) dendron amphiphile: helical fibers to nanorods, as light-harvesting antenna systems." Nanoscale 10, no. 3 (2018): 1464–73. http://dx.doi.org/10.1039/c7nr07663k.

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Ferrando, Giulio, Matteo Gardella, Matteo Barelli, Debasree Chowdhury, Pham Duy Long, Nguyen Si Hieu, Maria Caterina Giordano, and Francesco Buatier de Mongeot. "Plasmonic and 2D-TMD nanoarrays for large-scale photon harvesting and enhanced molecular photo-bleaching." EPJ Web of Conferences 266 (2022): 09003. http://dx.doi.org/10.1051/epjconf/202226609003.

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The urgent environmental and energy challenges require novel solutions for efficient light harvesting and conversion in new-generation ultra-thin devices. Plasmonic nanoantennas and flat optics nanogratings can promote light matter interaction at the nanoscale being very attractive for ultra-thin photonics and sensing applications. In this work we developed two light trapping solutions based on large-scale nanomaterials. The first system is a large-scale (cm2) plasmonic metasurface based on self-organized gold nanostripes. The second is based on the periodic re-shaping of ultra-thin semiconducting MoS2 layers forming large-area flat-optics nanogratings. Under this condition Rayleigh Anomalies can be resonantly excited thus promoting in-plane light confinement and photon absorption into the few-layers material. To demonstrate the impact of these nanopatterned systems in photon harvesting we probed their efficiency into a prototypal photochemical reaction: the photo-bleaching of Methylene Blue (MB). We demonstrate the resonant enhancement of the photo-bleaching of these polluting dye molecules promoted either by the localized plasmon resonance in Au nanostripes or by the Rayleigh Anomaly in flat-optics MoS2 nanogratings. We investigate this effect through a quantitative analysis of the solution photodissociation induced by a monochromatic light. These results show the strong potential of flat-optics templates for light-harvesting and energy conversion in ultra-thin photonic devices.
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Rozhkova, Elena. "Nano-Bio Assemblies Based on Natural and Artificial Proton Pump for Photocatalytic Hydrogen Production." ECS Meeting Abstracts MA2018-01, no. 31 (April 13, 2018): 1893. http://dx.doi.org/10.1149/ma2018-01/31/1893.

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Bioinspired photocatalytic transformation of solar energy and water to clean fuels such as hydrogen using semiconductors is among the most promising renewable energy technologies. “Greener” schemes of photocatalytic visible-light hydrogen production along with inorganic material utilize biological structures capable of light-harvesting, water splitting, or proton reduction. We have been developing visible-light-driven nano-bio photocatalysts for hydrogen production based on non-covalent assemblies of the natural and synthetic membrane proton pump and TiO2 semiconductor nanoparticles. A natural membrane complex of retinal-bearing proton pump bacteriorhodopsin (also known as purple membranes, PM) from the extremophile organism Halobacterium salinarum has been attracting an attention of researchers owing to its exceptional robustness, excellent photophysical properties, and structure−functional elegance. We demonstrated applicability of PMs in sunlight transformation systems constructed from TiO2, boosted with introduction of reduced graphene oxide rGO, or more recently, constructed as entirely synthetic PM – semiconductor architecture using cell-free synthetic biology approach. Fusing nanotechnology and synthetic biology approaches allows for systemic manipulation at the nanoparticle−bio interface toward directed evolution of energy nanomaterials and nanosystems. S. Balasubraanian, P. Wang, R. Schaller, T. Rajh, E.A. Rozhkova, NanoLetters 13, 3365−3371 (2013) P. Wang, N.M. Dimitrijevic, A.Y. Chang, R.D. Schaller, Y. Liu, T. Rajh, E.A. Rozhkova, ACS Nano, 8(8), 7995-8002 (2014) P. Wang, A. Y. Chang, V. Novosad, V. V. Chupin, R.D. Schaller, E. A. Rozhkova, ACS Nano, 11 (7), pp 6739–6745 (2017) E.A. Rozhkova, P. Wang. In Nanomaterials for Photocatalytic Chemistry, 12, 195-227 (2016)
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Szabó, Tibor, Róbert Janovics, Marianna Túri, István Futó, István Papp, Mihály Braun, Krisztián Németh, et al. "Isotope Analytical Characterization of Carbon-Based Nanocomposites." Radiocarbon 60, no. 4 (August 2018): 1101–14. http://dx.doi.org/10.1017/rdc.2018.63.

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ABSTRACTCarbon-based nanomaterials of different dimensions (1–3D, tubes, bundles, films, papers and sponges, graphene sheets) have been created and their characteristic properties have been discussed intensively in the literature. Due to their unique advantageous, tunable properties these materials became promising candidates in new generations of applications in many research laboratories and, recently, in industries as well. Protein-based bio-nanocomposites are referred to as materials of the future, which may serve as conceptual revolution in the development of integrated optical devices, e.g. optical switches, microimaging systems, sensors, telecommunication technologies or energy harvesting and biosensor applications. In our experiments, we designed various carbon-based nanomaterials either doped or not doped with nitrogen or sulfur during catalytic chemical vapor deposition synthesis. Radio- and isotope analytical studies have shown that the used starting materials, precursors and carriers have a strong influence on the geometry and physico-/chemical characteristics of the carbon nanotubes produced. After determining the 14C isotope constitution 53 m/m% balance was found in the reaction center protein/carbon nanotubes complex in a sensitive way that was prepared in our laboratory. The result is essential in determining the yield of conversion of light energy to chemical potential in this bio-hybrid system.
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Sun, Ke, Xiaotong Peng, Zengkang Gan, Wei Chen, Xiaolin Li, Tao Gong, and Pu Xiao. "3D Printing/Vat Photopolymerization of Photopolymers Activated by Novel Organic Dyes as Photoinitiators." Catalysts 12, no. 10 (October 19, 2022): 1272. http://dx.doi.org/10.3390/catal12101272.

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Even though numerous organic dyes which are used as photoinitiators/photocatalysts during photopolymerization have been systematically investigated and collected in previous reviews, further designs of these chromophores and the developments in high-performance photoinitiating systems have emerged in recent years, which play the crucial role in 3D printing/Vat polymerization. Here, in this mini-review, various families of organic dyes that are used as newly synthesized photoinitiators/photocatalysts which were reported in literature during 2021–2022 are specified by their photoinitiation mechanisms, which dominate their performance during photopolymerization, especially in 3D printing. Markedly, visible light-induced polymerization could be employed in circumstances not only upon the irradiation of artificial light sources, e.g., in LEDs, but also in sunlight irradiation. Furthermore, a short overview of the achievements of newly developed mechanisms, e.g., RAFT, photoinitiator-RAFT, and aqueous RAFT using organic chromophores as light-harvesting compounds to induce photopolymerization upon visible light irradiation are also thoroughly discussed. Finally, the reports on the semiconducting nanomaterials that have been used as photoinitiators/photocatalysts during photopolymerization are also introduced as perspectives that are able to expand the scope of 3D printing and materials science due to their various advantages such as high extinction coefficients, broad absorption spectra, and having multiple molecular binding points.
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Kapoor, Riti Thapar, Mohd Rafatullah, Mohammad Qamar, Mohammad Qutob, Abeer M. Alosaimi, Hajer S. Alorfi, and Mahmoud A. Hussein. "Review on Recent Developments in Bioinspired-Materials for Sustainable Energy and Environmental Applications." Sustainability 14, no. 24 (December 16, 2022): 16931. http://dx.doi.org/10.3390/su142416931.

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Nature has always inspired innovative minds for development of new designs. Animals and plants provide various structures with lower density, more strength and high energy sorption abilities that can incite the development of new designs with significant properties. By observing the important functions of biological structures found in nature, scientists have fabricated structures by bio-inspiration that have been proved to exhibit a significant improvement over traditional structures for their applications in the environmental and energy sector. Bio-fabricated materials have shown many advantages due to their easy synthesis, flexible nature, high performance and multiple functions as these can be used in light harvesting systems, batteries, biofuels, catalysis, purification of water, air and environmental monitoring. However, there is an urgent need for sensitive fabrication instruments that can synthesize bio-inspired structures and convert laboratory scale synthesis into large scale production. The present review highlights recent advances in synthesis of bio-inspired materials and use of hierarchical nanomaterials generated through biomolecular self-assembly for their use in removal of environmental contaminants and sustainable development.
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Isram, Muhammad, Riccardo Magrin Maffei, Valeria Demontis, Leonardo Martini, Stiven Forti, Camilla Coletti, Vittorio Bellani, et al. "Thermoelectric and Structural Properties of Sputtered AZO Thin Films with Varying Al Doping Ratios." Coatings 13, no. 4 (March 28, 2023): 691. http://dx.doi.org/10.3390/coatings13040691.

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Nanomaterials can be game-changers in the arena of sustainable energy production because they may enable highly efficient thermoelectric energy conversion and harvesting. For this purpose, doped thin film oxides have been proven to be promising systems for achieving high thermoelectric performances. In this work, the design, realization, and experimental investigation of the thermoelectric properties exhibited by a set of five Al:ZnO thin films with thicknesses of 300 nm and Al doping levels ranging from 2 to 8 at.% are described. Using a multi-technique approach, the main structural and morphological features of the grown thin films are addressed, as well as the electrical and thermoelectrical transport properties. The results show that the samples exhibited a Seebeck coefficient absolute value in the range of 22–33 μV/K, assuming their maximum doping level was 8 at.%, while the samples’ resistivity was decreased below 2 × 10−3 Ohm·cm with a doping level of 3 at.%. The findings shine light on the perspectives of the applications of the metal ZnO thin film technology for thermoelectrics.
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Zou, Tongqing, Yu Liu, Xinyue Zhang, Lu Chen, Qinqin Xu, Yancheng Ding, Ping Li, Chen Xie, Chao Yin, and Quli Fan. "Oligomerization Strategy of D-A-Type Conjugated Molecules for Improved NIR-II Fluorescence Imaging." Polymers 15, no. 16 (August 18, 2023): 3451. http://dx.doi.org/10.3390/polym15163451.

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Fluorescence imaging (FI) in the second near-infrared (NIR-II) window has emerged as a promising imaging method for cancer diagnosis because of its superior properties such as deep penetration depth and high signal-to-background ratio. Despite the superiorities of organic conjugated nanomaterials for NIR-II FI, the issues of low fluorescence quantum yield, weak metabolic capability, undefined molecular structure for conjugated polymers, weak light-harvesting ability, short emission wavelength, and high synthetic complexity for conjugated small molecules still remain to be concerned. We herein propose an oligomerization strategy by facilely adjusting the oligomerization time to balance the advantages and disadvantages between conjugated polymers and small molecules, obtaining the candidate (CO1, oligomerization time: 1 min) with the optimal NIR-II optical performance. Then the CO1 is further prepared into water-dispersed nanoparticles (CON1) via a nanoprecipitation approach. By virtue of the suitable size, excellent NIR-II optical properties, low toxicity, and strong cell-labeling ability, the CON1 is successfully employed for in vivo NIR-II imaging, permitting the real-time visualization of blood vascular system and tumors with high sensitivity and resolution. This work thus not only provides a personalized organic conjugated nano-agent for NIR-II FI, but also highlights the molecular strategy for the development of organic conjugated systems with optimal performance for bio-imaging.
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Torres, Tomas, Elisa López-Serrano, Marta Gomez-Gomez, Luis M. Mateo, Jorge Labella, Giovanni Bottari, and Mine Ince. "(Invited) Porphyrinoid-Carbon Nanostructure Ensembles and Fused Porphyrin-Graphene Nanoribbons." ECS Meeting Abstracts MA2022-01, no. 11 (July 7, 2022): 828. http://dx.doi.org/10.1149/ma2022-0111828mtgabs.

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Phthalocyanines (Pcs) have emerged as excellent light harvesting antennas for incorporation into D-A systems, mainly in connection with carbon nanostructures, like endohedral metallofullerenes, SWCNT and graphene, as acceptor or donor moieties, in which the Pc has been attached, covalently or through supramolecular interactions. They are among the few molecules that reveal an intense red and NIR absorption and therefore, constitute also promising dyes in molecular photovoltaics. Pcs have a great chemical versatility, which allows to modify their electronic character and their physicochemical properties by organic synthesis, by introducing substituents in the periphery or modifying the structure of the macrocycle. Most recently they have reached good efficiency values participating as hole transporting materials in Carbon-based Perovskite sensitized solar cells (PSSCs). Pcs are be appropriately designed to adapt well to the electronic levels of the different types of perovskites. Through a rational design, structure-property relationships will be established that will gradually improve the performance of the devices. On the other hand, on-surface synthesis offers a versatile approach to fabricate novel carbon-based nanostructures that cannot be obtained via conventional solution chemistry. Within the family of such nanomaterials, graphene nanoribbons (GNRs) hold a privileged position due to their high potential for different applications. One of the key issues for their application in molecular electronics lies in the fine-tuning of their electronic properties through structural modifications, such as heteroatom doping or the incorporation of non-benzenoid rings. In this context, the covalent fusion of GNRs and porphyrins (Pors) represents a highly appealing strategy.
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FOX, MARYE ANNE, WAYNE E. JONES, and DIANA M. WATKINS. "Light-Harvesting Polymer Systems." Chemical & Engineering News 71, no. 11 (March 15, 1993): 38–48. http://dx.doi.org/10.1021/cen-v071n011.p038.

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Dissertations / Theses on the topic "Nanomaterials - Light Harvesting Systems"

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Stevens, Amy L. "Energy transfer processes in supramolecular light-harvesting systems." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:43833f3a-96b0-432a-9608-8f08a9096be7.

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This dissertation attempts to understand how energy transfer in a molecular wire and a spherical organic assembly are affected by molecular structure. The molecular wire is a DNA-hybrid structure composed of a strand of thymine bases appended by a cyanine dye. Hydrogen bonded to each base is a naphthalene-derivative molecule. Using time-integrated photoluminescence and time-correlated single photon counting measurements, energy transfer from the naphthalene donors to the cyanine acceptors was confirmed, and its dependence on temperature and DNA-template length investigated. Donor-thymine bonding was disrupted at temperatures above about 25 degrees Celcius resulting in poor donor template decoration and low rates of energy transfer. Increasing numbers of donors attach to the scaffold, forming an orderly array, as the template length increases due to the stabilising effects of the donor-donor pi-stacking interactions. Conversely, modelled energy transfer rates fall as the scaffold length increases because of the longer donor-acceptor distances involved. Therefore, the energy transfer rate was greatest for a template built from 30 thymines. The spherical organic assemblies (nanoparticles) are formed by fast injection of a small volume of molecularly dissolved fluorene-derivative amphiphilic molecules into a polar solvent. The amphiphilic molecules contained either a naphthalene (donor) or a benzothiadiazole (acceptor) core. The donor-acceptor mixed nanoparticles resemble an amorphous polymer film and were modelled as such using the Foerster resonance energy transfer theory. The Foerster radii extracted from the measurements depends intricately on the donor-acceptor spectral overlap and distance. The latter effect was controlled by the stacking interactions between the molecules. Altering the morphology of the structural units is the key to optimising energy transfer in molecular structures. To achieve efficient organic molecule-based devices, the importance of this property needs to be fully appreciated and effectively exploited.
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Huang, Xia. "Fabrication of artificial light-harvesting systems for energy transfer studies." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/21488/.

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Molukanele, Palesa Patricia. "Dynamics of energy transfer in light harvesting photosynthetic systems / P. Molukanele." Thesis, North-West University, 2009. http://hdl.handle.net/10394/5101.

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Photosynthesis is the process by which plants, algae and photo synthetic bacteria convert sunlight energy into chemical energy (ATP). The initial stages of this process (harvesting solar energy and transferring it to the reaction centres) occur extremely fast and with an efficiency of close to 100%. Studying the dynamics of these reactions will enable us to develop artificial functional light harvesting arrays and energy transfer systems that mimic the process in nature, thus helping us use light as an energy source that is environmentally clean, efficient, sustainable and carbon-neutral. These reactions can be measured using femtosecond pump-probe spectroscopy (transient absorption in the liquid phase and monitoring the subsequent kinetics in the wavelength region: 400 nm-700 nm). In order to perform these experiments, photo synthetic pigment-protein complexes must be isolated, purified and characterised. In this work, these photo synthetic complexes were isolated from spinach leaves and characterised using various biological and spectroscopic techniques. Finally, the first results of pump-probe application to biological samples in South Africa were discussed.
Thesis (M.Sc. (Environmental Sciences))--North-West University, Potchefstroom Campus, 2009.
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Gullo, Maria Pia <1987&gt. "Photophysical investigation of light-harvesting systems for solar-to-fuel conversion." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6927/1/Gullo_Maria_Pia_Tesi.pdf.

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In recent years, an increasing attention has been given to the optimization of the performances of new supramolecular systems, as antennas for light collection. In such background, the aim of this thesis was the study of multichromophoric architectures capable of performing such basic action. A synthetic antenna should consist of a structure with large UV-Vis absorption cross-section, panchromatic absorption, fixed orientation of the components and suitable energy gradients between them, in order to funnel absorbed energy towards a specific site, through fast energy-transfer processes. Among the systems investigated in this thesis, three suitable classes of compounds can be identified: 1) transition metal-based multichromophoric arrays, as models for antenna construction, 2) free-base trans-A2B-phenylcorroles, as self-assembling systems to make effective mimics of the photosynthetic system, and 3) a natural harvester, the Photosystem I, immobilized on the photoanode of a solar-to-fuel conversion device. The discussion starts with the description of the photophysical properties of dinuclear quinonoid organometallic systems, able to fulfil some of the above mentioned absorption requirements, displaying in some cases panchromatic absorption. The investigation is extended to the efficient energy transfer processes occurring in supramolecular architectures, suitably organized around rigid organic scaffolds, such as spiro-bifluorene and triptycene. Furthermore, the photophysical characterization of three trans-A2B-phenylcorroles with different substituents on the meso-phenyl ring is introduced, revealing the tendency of such macrocycles to self-organize into dimers, by mimicking natural self-aggregates antenna systems. In the end, the photophysical analysis moved towards the natural super-complex PSI-LHCI, immobilized on the hematite surface of the photoanode of a bio-hybrid dye-sensitized solar cell. The importance of the entire work is related to the need for a deep understanding of the energy transfer mechanisms occurring in supramolecules, to gain insights and improve the strategies for governing the directionality of the energy flow in the construction of well-performing antenna systems.
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Gullo, Maria Pia <1987&gt. "Photophysical investigation of light-harvesting systems for solar-to-fuel conversion." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6927/.

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In recent years, an increasing attention has been given to the optimization of the performances of new supramolecular systems, as antennas for light collection. In such background, the aim of this thesis was the study of multichromophoric architectures capable of performing such basic action. A synthetic antenna should consist of a structure with large UV-Vis absorption cross-section, panchromatic absorption, fixed orientation of the components and suitable energy gradients between them, in order to funnel absorbed energy towards a specific site, through fast energy-transfer processes. Among the systems investigated in this thesis, three suitable classes of compounds can be identified: 1) transition metal-based multichromophoric arrays, as models for antenna construction, 2) free-base trans-A2B-phenylcorroles, as self-assembling systems to make effective mimics of the photosynthetic system, and 3) a natural harvester, the Photosystem I, immobilized on the photoanode of a solar-to-fuel conversion device. The discussion starts with the description of the photophysical properties of dinuclear quinonoid organometallic systems, able to fulfil some of the above mentioned absorption requirements, displaying in some cases panchromatic absorption. The investigation is extended to the efficient energy transfer processes occurring in supramolecular architectures, suitably organized around rigid organic scaffolds, such as spiro-bifluorene and triptycene. Furthermore, the photophysical characterization of three trans-A2B-phenylcorroles with different substituents on the meso-phenyl ring is introduced, revealing the tendency of such macrocycles to self-organize into dimers, by mimicking natural self-aggregates antenna systems. In the end, the photophysical analysis moved towards the natural super-complex PSI-LHCI, immobilized on the hematite surface of the photoanode of a bio-hybrid dye-sensitized solar cell. The importance of the entire work is related to the need for a deep understanding of the energy transfer mechanisms occurring in supramolecules, to gain insights and improve the strategies for governing the directionality of the energy flow in the construction of well-performing antenna systems.
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Roth, Johannes S. "Light harvesting in low dimensional systems : application of driven Brownian ratchets in supported lipid bilayers for the creation of light harvesting mimics." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/8626/.

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Supported lipid bilayers are a well known model system for the cell membrane. They allow for the investigation of the membrane in a controlled environment. The solid supported bilayer is accessible through the surface it is formed on and allows for different experimental techniques to be applied. This thesis presents work on free diffusion in the membrane and electrophoretically driven transport concentration of charged membrane components. In addition to that, novel supports for the support of membrane proteins have been investigated and surface enhanced Raman spectroscopy is presented as a label-free method for the detection of membrane components. Brownian ratchets have been used for applications such as molecular sorting with and without the use of lipid bilayers. So far the work has mainly been focussed on their use without a thorough investigation of their properties and the parameters influencing their efficiency. Here, the size and time parameters are varied in experiment and calculation and their role in the ratcheting process is discussed. The efficiency of the ratchets can be significantly reduced when the parameters are chosen in an optimal manner. The use of electrophoresis in lipid bilayers for the concentration and separation of membrane components has focussed on using two electrodes in simple patterns such as squares or lines. This is expanded here on more complex patterns which also allow for the retention of charged material in trapping regions. The pattern was then used to demonstrate the ability to determine binding coefficients in the trapping regions even for membrane components with a low initial concentration or low fluorescence quantum yield. More complex electrode systems using four patterned electrodes are also presented which allow for the application of electric fields in two dimensions where the strength and orientation of the field can be chosen almost arbitrarily. Polymer supports have the ability to support lipid bilayers with membrane proteins which exhibit significant extramembranous domains. Two novel supports are investigated here and different lipid bilayer formation routes are explored. To allow for label free detection of lipids, peptides or proteins within the membrane, surface enhanced Raman spectroscopy is used. The ability of this method to distinguish between different lipids and to detect peptides within the membrane is shown, as well.
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Dietzek, Benjamin. "Ultrafast linear and non-linear spectroscopy from biological light receptors to artificial light harvesting systems /." Doctoral thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=978743733.

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Bhise, Anil Dnyanoba. "A biomimetic approach for synthesizing artificial light-harvesting systems using self-assembly." Karlsruhe : FZKA, 2004. http://bibliothek.fzk.de/zb/berichte/FZKA7174.pdf.

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Bhise, Anil Dnyanoba. "A biomimetic approach for synthesizing artificial light-harvesting systems using self-assembly /." Karlsruhe : Forschungszentrum, 2005. http://www.gbv.de/dms/bs/toc/503994367.pdf.

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Univ., Diss.--Karlsruhe, 2005.
Auch als elektronische Ressource vorh. Literaturverz. S. 126 - 133. Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden. Zsfassung in dt. Sprache.
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Valleau, Stephanie. "Theoretical study of exciton transport in natural and synthetic light-harvesting systems." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493387.

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In the first part of this dissertation, we investigate on the presence of quantum effects in the exciton dynamics of the Fenna-Matthews-Olson photosynthetic complex of green sulfur bacteria using an atomistic Quantum Mechanics / Molecular Mechanics (QM/MM) model combined with open quantum systems methods. Subsequently, we explore the theoretical connection between the atomistic QM/MM approach and the open quantum system methods and propose the correct theoretical expressions to maintain consistency when using both approaches contemporarily. In particular we show that when using the correct prefactor to extract the spectral density - the strength of coupling between excitation and other degrees of freedom - the atomistic results are in good agreement with experimental predictions. We then describe a first atomistic study of the full light-harvesting complex of green sulfur bacteria. The various units are treated atomistically and the full system's exciton dynamics is obtained using a Markovian open quantum system master equation. To conclude the first part, we describe a Machine Learning algorithm which we developed and implemented to learn time-dependent density functional theory energies by using trained neural networks and supplying these with coulomb matrices extracted from molecular dynamics simulations. This approach provides a much more rapid solution to obtaining a QM/MM Hamiltonian and subsequently extracting dynamics. It is particularly useful when multiple identical molecules are found in similar environments as one can train the network on a single molecule and predict all others. We applied this method to the Fenna-Matthews-Olson complex. In the second part of this dissertation we focus on model systems and synthetic aggregates. In particular, we investigate the exciton dynamics in thin-film J-aggregates using a Markovian stochastic Schrödinger equation approach. We derive expressions to obtain diffusion constants from the dynamics and compare a series of different thin-film J-aggregates. The parameters of the model are obtained atomistically. From this model we obtain information on the parameters which lead to optimal exciton diffusion. This can guide the design of new exciton transfer materials.
Chemistry and Chemical Biology
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Books on the topic "Nanomaterials - Light Harvesting Systems"

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Scheer, Hugo, and Siegfried Schneider, eds. Photosynthetic Light-Harvesting Systems. Organization and Function. Berlin, Boston: De Gruyter, 1988. http://dx.doi.org/10.1515/9783110861914.

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1942-, Scheer Hugo, and Schneider Siegfried 1940-, eds. Photosynthetic light-harvesting systems: Organization and function : proceedings of an international workshop, October 12-16, 1987, Freising, Fed. Rep. of Germany. Berlin: W. de Gruyter, 1988.

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Prakash Singh, Surya, ed. Light Harvesting Nanomaterials. BENTHAM SCIENCE PUBLISHERS, 2015. http://dx.doi.org/10.2174/97816080595841150101.

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Photosynthesis III: Photosynthetic membranes and light harvesting systems. Berlin, 1986.

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Scheer, Hugo. Photosynthetic Light-Harvesting Systems: Organizations and Functions : Proceedings. Walter De Gruyter Inc, 1988.

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Arntzen, Charles J., and L. Andrew Staehelin. Photosynthesis III: Photosynthetic Membranes and Light Harvesting Systems. Springer London, Limited, 2013.

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Arntzen, Charles J., and L. Andrew Staehelin. Photosynthesis III: Photosynthetic Membranes and Light Harvesting Systems. Springer London, Limited, 2014.

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Kilchytska, Valeriya, Denis Flandre, Francis Balestra, and Alexei Nazarov. Functional Nanomaterials and Devices for Electronics, Sensors and Energy Harvesting. Springer, 2014.

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Encyclopedia of Plant Physiology: Photosynthetic Membranes and Light Harvesting Systems: Photosynthesis. Springer-Verlag Berlin and Heidelberg GmbH & Co. KG, 1986.

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Carbon Nanomaterials For Advanced Energy Systems Advances In Materials Synthesis And Device Applications. John Wiley & Sons Inc, 2014.

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Book chapters on the topic "Nanomaterials - Light Harvesting Systems"

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Dey, Sunita, and Soumita Talukdar. "Nanomaterials for Light Harvesting." In Nanomaterials for Advanced Technologies, 19–33. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1384-6_2.

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Trimzi, Syed Muhammad Ali, Muhammad Wajahat Ali, Ataf Ali Altaf, and Samia Kausar. "Organic–Inorganic Nanohybrids for Light Harvesting Application." In Materials Horizons: From Nature to Nanomaterials, 405–18. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4538-0_18.

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Della Pelle, Andrea M., and Sankaran Thayumanavan. "Bioinspired Dendritic Light-Harvesting Systems." In Bioinspiration and Biomimicry in Chemistry, 397–417. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118310083.ch13.

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Larkum, Anthony W. D. "Light-Harvesting Systems in Algae." In Photosynthesis in Algae, 277–304. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1038-2_13.

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Ferreira Carvalho, Carlos Manuel, and Nuno Filipe Silva Veríssimo Paulino. "Energy Harvesting Electronic Systems." In CMOS Indoor Light Energy Harvesting System for Wireless Sensing Applications, 7–42. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21617-1_2.

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Zuber, H., R. J. Cogdell, E. Gantt, Jan M. Anderson, and J. Barrett. "Comparative Biochemistry of Light-Harvesting Systems." In Photosynthesis III, 238–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70936-4_6.

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Macpherson, Alisdair N., and Roger G. Hiller. "Light-Harvesting Systems in Chlorophyll c-Containing Algae." In Light-Harvesting Antennas in Photosynthesis, 323–52. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2087-8_11.

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Falkowski, Paul G., and Yi-Bu Chen. "Photoacclimation of Light Harvesting Systems in Eukaryotic Algae." In Light-Harvesting Antennas in Photosynthesis, 423–47. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2087-8_15.

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Mimuro, Mamoru, and Hiroto Kikuchi. "Antenna Systems and Energy Transfer in Cyanophyta and Rhodophyta." In Light-Harvesting Antennas in Photosynthesis, 281–306. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2087-8_9.

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Gantt, Elisabeth, Beatrice Grabowski, and Francis X. Cunningham. "Antenna Systems of Red Algae: Phycobilisomes with Photosystem ll and Chlorophyll Complexes with Photosystem I." In Light-Harvesting Antennas in Photosynthesis, 307–22. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2087-8_10.

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Conference papers on the topic "Nanomaterials - Light Harvesting Systems"

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Mostafavi, Amirhossein, Vamsi Kiran Eruvaram, and Donghyun Shin. "Experimental Study of Thermal Performance Enhancement of Molten Salt Nanomaterials." In ASME 2018 Power Conference collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/power2018-7516.

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Concentrating solar power (CSP) plants are one of the main technologies harvesting solar energy indirectly. In CSP systems, solar radiant light is concentrated into a focal receiver, where heat transfer fluid (HTF) as the energy carrier absorbs solar radiation. Thermal energy storage (TES) is the key method to expand operational time of CSP plants. Consequently, thermo-physical properties of the HTF is an important factor in transferring thermal energy. One of the promising chemicals for this purpose is a mixture of molten salts with stable properties at elevated temperatures. However, low thermal properties of molten salts, such as specific heat capacity (cp) around 1.5 kJ/kg°C, constrain thermal performance of CSP systems. Recently, many studies have been conducted to overcome this shortcoming, by adding minute concentration of nanoparticles. In this work, the selected molten salt eutectic is a mixture of LiNO3–NaNO3 by composition of 54:46 mol. % plus dispersing Silicon Dioxide (SiO2) nanoparticles with 10nm particle size. The results from the measured specific heat capacity by modulated differential scanning calorimeter (MDSC) shows a 9% cp enhancement. Moreover, the viscosity of the mixture is measured by a rheometer and the results show that the viscosity of molten salt samples increases by 27% and this may result in increasing the pumping energy of the HTF. Consequently, overall thermal performance of the selected mixture is investigated by figure of merit (FOM) analysis. The interesting results show an enhancement of the thermal storage of this mixture disregard with the viscosity increase effect.
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Zakrzewska, K., A. Kusior, and M. Radecka. "Light harvesting and charge transfer in metal oxide nanomaterials for hydrogen energy generation." In 2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS). IEEE, 2019. http://dx.doi.org/10.1109/powermems49317.2019.92321101197.

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Nielsen, Kim T., Holger Spanggaard, and Frederik C. Krebs. "Design of porphyrin-polyphenyleneethynylene light harvesting systems." In Optics & Photonics 2005, edited by Zakya H. Kafafi and Paul A. Lane. SPIE, 2005. http://dx.doi.org/10.1117/12.613640.

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Choi, Jongouk, Jianping Zeng, Dongyoon Lee, Changwoo Min, and Changhee Jung. "Write-Light Cache for Energy Harvesting Systems." In ISCA '23: 50th Annual International Symposium on Computer Architecture. New York, NY, USA: ACM, 2023. http://dx.doi.org/10.1145/3579371.3589098.

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Moayeri Pour, Golsa, and Walter D. Leon-Salas. "Solar energy harvesting with light emitting diodes." In 2014 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2014. http://dx.doi.org/10.1109/iscas.2014.6865551.

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Patra, Amitava, Dipankar Bain, and Subarna Maity. "Nano-bio assemblies for artificial light harvesting systems." In Colloidal Nanoparticles for Biomedical Applications XIII, edited by Xing-Jie Liang, Wolfgang J. Parak, and Marek Osiński. SPIE, 2018. http://dx.doi.org/10.1117/12.2287324.

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Malakooti, Mohammad H., Florian Julé, and Henry A. Sodano. "Energy Harvesting Performance of Printed Barium Titanate Nanocomposites." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-8093.

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Development of nanostructured devices for sensing, energy storage, actuating, and energy harvesting has attracted many researchers. The most common type of functional nanostructures is piezoelectric nanomaterials. Regardless of numerous studies in this area, there is a need for rapid fabrication of nanostructured devices, or simply functional nanocomposites. Here we present a simple, scalable fabrication technique for additive manufacturing of nanocomposite energy harvesting devices composed of barium titanate nanowires. Details on hydrothermal synthesis of barium titanate (BaTiO3) nanowires and printable inks, manufacturing process, and energy harvesting performance of the printed devices are presented here. The experimental results suggest that additive manufacturing of functional nanocomposites allows controlling the microstructures and enhancing device performance.
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Whaley, Birgitta. "Single Photon Absorption by Single Photosynthetic Light Harvesting Systems." In Frontiers in Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/fio.2017.fm2e.3.

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Aida, Takuzo. "Tailoring assembled systems for light harvesting and energy conversion." In NOBEL SYMPOSIUM 153: NANOSCALE ENERGY CONVERTERS. AIP, 2013. http://dx.doi.org/10.1063/1.4794714.

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Kramer, Tobias, and Christoph Kreisbeck. "Modelling excitonic-energy transfer in light-harvesting complexes." In LATIN-AMERICAN SCHOOL OF PHYSICS MARCOS MOSHINSKY ELAF: Nonlinear Dynamics in Hamiltonian Systems. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4861701.

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Reports on the topic "Nanomaterials - Light Harvesting Systems"

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Knappenberger, Jr, and Kenneth L. Magnetoplasmonic Nanomaterials: A Route to Predictive Photocatalytic, Light-Harvesting and Ferrofluidic Properties. Fort Belvoir, VA: Defense Technical Information Center, October 2013. http://dx.doi.org/10.21236/ada606151.

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Niederman, Robert A., Robert E. Blankenship, and Harry A. Frank. PS2013 Satellite Workshop on Photosynthetic Light-Harvesting Systems. Office of Scientific and Technical Information (OSTI), February 2015. http://dx.doi.org/10.2172/1169442.

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Ely, Roger, Catherine Page, and David Kehoe. Engineered, Solid-State Processes for Enhanced Biosolar Hydrogen Production and Exploitation of Solar Energy with Tailored Light-Harvesting Systems. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada581276.

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Burks, Thomas F., Victor Alchanatis, and Warren Dixon. Enhancement of Sensing Technologies for Selective Tree Fruit Identification and Targeting in Robotic Harvesting Systems. United States Department of Agriculture, October 2009. http://dx.doi.org/10.32747/2009.7591739.bard.

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The proposed project aims to enhance tree fruit identification and targeting for robotic harvesting through the selection of appropriate sensor technology, sensor fusion, and visual servo-control approaches. These technologies will be applicable for apple, orange and grapefruit harvest, although specific sensor wavelengths may vary. The primary challenges are fruit occlusion, light variability, peel color variation with maturity, range to target, and computational requirements of image processing algorithms. There are four major development tasks in original three-year proposed study. First, spectral characteristics in the VIS/NIR (0.4-1.0 micron) will be used in conjunction with thermal data to provide accurate and robust detection of fruit in the tree canopy. Hyper-spectral image pairs will be combined to provide automatic stereo matching for accurate 3D position. Secondly, VIS/NIR/FIR (0.4-15.0 micron) spectral sensor technology will be evaluated for potential in-field on-the-tree grading of surface defect, maturity and size for selective fruit harvest. Thirdly, new adaptive Lyapunov-basedHBVS (homography-based visual servo) methods to compensate for camera uncertainty, distortion effects, and provide range to target from a single camera will be developed, simulated, and implemented on a camera testbed to prove concept. HBVS methods coupled with imagespace navigation will be implemented to provide robust target tracking. And finally, harvesting test will be conducted on the developed technologies using the University of Florida harvesting manipulator test bed. During the course of the project it was determined that the second objective was overly ambitious for the project period and effort was directed toward the other objectives. The results reflect the synergistic efforts of the three principals. The USA team has focused on citrus based approaches while the Israeli counterpart has focused on apples. The USA team has improved visual servo control through the use of a statistical-based range estimate and homography. The results have been promising as long as the target is visible. In addition, the USA team has developed improved fruit detection algorithms that are robust under light variation and can localize fruit centers for partially occluded fruit. Additionally, algorithms have been developed to fuse thermal and visible spectrum image prior to segmentation in order to evaluate the potential improvements in fruit detection. Lastly, the USA team has developed a multispectral detection approach which demonstrated fruit detection levels above 90% of non-occluded fruit. The Israel team has focused on image registration and statistical based fruit detection with post-segmentation fusion. The results of all programs have shown significant progress with increased levels of fruit detection over prior art.
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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova, and Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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