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PubMed Journals Articles About "Lightweight Catalyst Artificial Photosynthesis" RSS

15:10 EST 9th December 2018 | BioPortfolio

Lightweight Catalyst Artificial Photosynthesis PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Lightweight Catalyst Artificial Photosynthesis articles that have been published worldwide.

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Showing "Lightweight Catalyst Artificial Photosynthesis" PubMed Articles 1–25 of 2,900+

Interfacing nature's catalytic machinery with synthetic materials for semi-artificial photosynthesis.

Semi-artificial photosynthetic systems aim to overcome the limitations of natural and artificial photosynthesis while providing an opportunity to investigate their respective functionality. The progress and studies of these hybrid systems is the focus of this forward-looking perspective. In this Review, we discuss how enzymes have been interfaced with synthetic materials and employed for semi-artificial fuel production. In parallel, we examine how more complex living cellular systems can be recruited for in...


High-performance and Lightweight Thermal Management Devices by 3D Printing and Assembly of Continuous Carbon Nanotube Sheet.

Freestanding carbon nanotube films or buckypaper can provide a significant platform to develop practical applications of nanocarbon materials. For this research, buckypaper with high thermal conductivity (20 W/mK) and large surface area (350 m/g) was mass produced in-house to investigate for use in lightweight thermal management devices. Floating catalyst chemical vapor deposition (FC-CVD) carbon nanotube sheets were also studied in this work. We introduced two manufacturing techniques to use the sheets for...

A photochemical diode artificial photosynthesis system for unassisted high efficiency overall pure water splitting.

The conversion of solar energy into chemical fuels can potentially address many of the energy and environment related challenges we face today. In this study, we have demonstrated a photochemical diode artificial photosynthesis system that can enable efficient, unassisted overall pure water splitting without using any sacrificial reagent. By precisely controlling charge carrier flow at the nanoscale, the wafer-level photochemical diode arrays exhibited solar-to-hydrogen efficiency ~3.3% in neutral (pH ~...


CO₂ Overall Splitting by Bifunctional Metal-Free Electrocatalyst.

Artificial photosynthesis, consisting photo/electrochemical CO₂ splitting, facilitates renewable energy conversion and storage but is impeded by the low cost-effective catalysts for key reactions: CO₂ reduction (CDRR) and water oxidation. Herein, we developed a porous silicon and nitrogen codoped carbon (SiNC) nanomaterials by a facile pyrolyzation as a metal-free bifunctional electrocatalyst. CO₂-to-CO and oxygen evolution (OER) partial current density in neutral condition were two-orders-of-magnitud...

Watching Visible Light-Driven CO Reduction on a Plasmonic Nanoparticle Catalyst.

Photocatalytic reduction of carbon dioxide (CO) by visible light has the potential to mimic plant photosynthesis and facilitate the renewable production of storable fuels. Accomplishing desirable efficiency and selectivity in artificial photosynthesis requires understanding of light-driven pathways on photocatalyst surfaces. Here, we probe with single-NP spatial resolution the dynamics of a plasmonic silver (Ag) photocatalyst under operando conditions of visible light-driven CO reduction. In-situ surface en...

Semi-artificial photosynthesis.

Combining the strengths of catalytic biomachineries with those of synthetic materials can yield more efficient and durable solar chemical conversion.

Measuring the dynamic photosynthome.

Photosynthesis underpins plant productivity and yet is notoriously sensitive to small changes in environmental conditions, meaning that quantitation in nature across different time scales is not straightforward. The 'dynamic' changes in photosynthesis (i.e. the kinetics of the various reactions of photosynthesis in response to environmental shifts) are now known to be important in driving crop yield.

In situ formation of catalytically active graphene in ethylene photo-epoxidation.

Ethylene epoxidation is used to produce 2 × 10 ton per year of ethylene oxide, a major feedstock for commodity chemicals and plastics. While high pressures and temperatures are required for the reaction, plasmonic photoexcitation of the Ag catalyst enables epoxidation at near-ambient conditions. Here, we use surface-enhanced Raman scattering to monitor the plasmon excitation-assisted reaction on individual sites of a Ag nanoparticle catalyst. We uncover an unconventional mechanism, wherein the primary ...

Tuning Cu/Cu2O Interfaces for Reduction of Carbon Dioxide to Methanol in Aqueous Solutions.

Artificial photosynthesis can store solar energy and reduce CO2 into fuels to potentially alleviate global warming and energy crisis. Compared to gas products, it remains a grand challenge to tune the product distribution of artificial photosynthesis to liquid fuels, such as CH3OH, that are suitable for storage and transport. This paper describes the introduction of metallic Cu nanoparticles (NPs) on Cu2O films to change the product distribution from gas products on bare Cu2O to predominant CH3OH via CO2 re...

Zinc Finger Artificial Transcription Factor-Mediated Chloroplast Genome Interrogation In Arabidopsis thaliana.

The large majority of core photosynthesis proteins in plants are encoded by nuclear genes, but a small portion has been retained in the plastid genome. These plastid-encoded chloroplast proteins fulfill essential roles in the process of photochemistry. Here, we report about the use of nuclear-encoded, chloroplast targeted zinc finger artificial transcription factors (ZF-ATFs) with effector domains of prokaryotic origin to modulate the expression of chloroplast genes, and to enhance the photochemical activit...

Not all lightweight lead aprons and thyroid shields are alike.

With the explosion of minimally invasive surgery, the use of fluoroscopy has significantly increased. Concurrently, there has been a demand for lighter weight aprons. The industry answered this call with the development of lightweight aprons. Our goal was to see whether lighter weight garments provide reduced protection.

Why nature chose the MnCaO cluster as water-splitting catalyst in photosystem II: a new hypothesis for the mechanism of O-O bond formation.

Resolving the questions, namely, the selection of Mn by nature to build the oxygen-evolving complex (OEC) and the presence of a cubic Mn3CaO4 structure in OEC coupled with an additional dangling Mn (Mn4) via μ-O atom are not only important to uncover the secret of water oxidation in nature, but also essential to achieve a blueprint for developing advanced water-oxidation catalysts for artificial photosynthesis. Based on the important experimental results reported so far in the literature and on our own fin...

Remembering Otto Kandler (1920-2017) and his contributions.

After a brief prologue on Otto Kandler's life, we describe briefly his pioneering work on photosynthesis (photophosphorylation and the carbon cycle) and his key participation in the discovery of the concept of three forms of life (Archaea, Prokarya, and Eukarya). With Otto Kandler's passing, both the international photosynthesis and microbiology communities have lost an internationally unique, eminent, and respected researcher and teacher who exhibited a rare vibrancy and style.

The artificial humic substance HS1500 does not inhibit photosynthesis of the green alga Desmodesmus armatus in vivo but interacts with the photosynthetic apparatus of isolated spinach thylakoids in vitro.

Humic substances (HSs) can influence the growth and composition of freshwater phytoplankton assemblage. Since HSs contain many phenolic and quinonic moieties and cause growth reductions in eco-physiological field experiments, HSs are considered photosystem II herbicides. To test this specific mode of action in vivo and in vitro, respectively, we used intact cells of the green alga Desmodesmus armatus, as well as thylakoids isolated from spinach (Spinacia oleracea) as a model system for the green algal chlor...

Pretreatment of Leucaena leucocephala wood by acidified glycerol: optimization, severity index and correlation analysis.

In this study, Leucaena leucocephala wood was pretreated with aqueous glycerol having HSO as the catalyst. Response surface methodology (RSM) and artificial neural network (ANN) were used to optimize the process parameters, catalyst concentration (1-3%), duration (120-300 min) and temperature (100-150 °C). ANN gave more accurate predictions for total reducing sugar yield than RSM. ANN also had lower values for error functions. Severity index (SI) was calculated based on the temperature, duration and ca...

Important photosynthetic contribution of silique wall to seed yield-related traits in Arabidopsis thaliana.

In plants, green non-foliar organs are able to perform photosynthesis just as leaves do, and the seed-enclosing pod acts as an essential photosynthetic organ in legume and Brassica species. To date, the contribution of pod photosynthesis to seed yield and related components still remains largely unexplored, and in Arabidopsis thaliana, the photosynthetic activity of the silique (pod) is unknown. In this study, an Arabidopsis glk1/glk2 mutant defective in both leaf and silique photosynthesis was used to crea...

Investigating the NAD-ME biochemical pathway within C grasses using transcript and amino acid variation in C photosynthetic genes.

Expanding knowledge of the C photosynthetic pathway can provide key information to aid biological improvements to crop photosynthesis and yield. While the C NADP-ME pathway is well characterised, there is increasing agricultural and bioengineering interest in the comparably understudied NAD-ME and PEPCK pathways. Within this study, a systematic identification of key differences across species has allowed us to investigate the evolution of C-recruited genes in one C and eleven C grasses (Poaceae) spanning tw...

Mechanism for O-O bond formation via radical coupling of metal and ligand based radicals - a new pathway.

Artificial Photosynthesis carries promise to deliver abundant clean energy for the needs of a growing population. Deep mechanistic understanding is required to achieve rational design of fast and durable water oxidation catalysts. Here we provided first evidences for a new mechanism of the O-O bond formation via radical coupling of the oxidized metal=oxo of radicaloid character (RuIV=O) and ligand based radical ([ligand-NO]+• cation radical). O-O bond formation is facilitated via spin alignment and takes ...

Genetic variation in transcription factors and photosynthesis light-reaction genes regulates photosynthetic traits.

Transcription factors (TFs) play crucial roles in regulating the production of the components required for photosynthesis; elucidating the mechanisms by which underlying genetic variation in TFs affects complex photosynthesis-related traits may improve our understanding of photosynthesis and identify ways to improve photosynthetic efficiency. Promoter analysis of 96 nuclear-encoded Populus tomentosa Carr. genes within this pathway revealed 47 motifs responsive to light, stress, hormones and organ-specific r...

Silicon carbide foam supported ZSM-5 composite catalyst for microwave-assisted pyrolysis of biomass.

Considering a series of issues facing the application of catalysts in large scale catalytic fast pyrolysis systems, a novel composite catalyst of ZSM-5 coatings on SiC foam supports was developed and tested for ex-situ catalytic upgrading of the pyrolytic vapors. Different configurations of catalysts placement were compared and the results showed the composite catalyst could significantly improve the bio-oil quality without significantly reducing the yield. The effect of catalyst to biomass ratio on the pro...

Study of one-step photosynthesis of Ag nanoparticles.

During photosynthesis of metal nanoparticles (NPs) in aromatic ketone systems, the aromatic ketone triplets are explored as hydrogen atom/electron abstractors which yield highly reactive radicals. However, their electron donation ability is sparsely recognized. Here we report the investigations of benzophenone (BP)-initiated one-step photosynthesis of Ag NPs in H donor free system using spectroscopic and theoretical methods. Experimentally, the direct observations of BP cation radical (BP) and Ag NPs via tr...

Selective CO Evolution from Photoreduction of CO2 on a Metal-Carbide-Based Composite Catalyst.

A selective CO evolution from photoreduction of CO2 in wa-ter was achieved on a noble-metal-free, carbide-based compo-site catalyst, as demonstrated by a CO selectivity of 98.3% among all carbon-containing products and a CO evolution rate of 29.2 μmol h-1, showing superiority to noble-metal-based catalyst. A rapid separation of the photogenerated electron-hole pairs and improved CO2 adsorption on the surface of the carbide component are responsible for the excellent perfor-mance of the catalyst. The high C...

Catalytic fast pyrolysis of torrefied corn cob to aromatic hydrocarbons over Ni-modified hierarchical ZSM-5 catalyst.

Catalytic fast pyrolysis (CFP) of torrefied corn cob using Ni-modified hierarchical ZSM-5 catalyst was conducted in this study. The prepared catalysts were characterized by N adsorption and desorption (N-BET), X-ray diffraction (XRD), and temperature-programmed desorption of NH (NH-TPD). NaOH solution treatment resulted in the lower peak intensities of hierarchical ZSM-5 catalyst in the XRD patterns while Ni modification improved the catalyst framework. In addition, NaOH solution treatment created some meso...

A comparative study of NiCoO catalyst supported on Ni foam and from solution residuals fabricated by a hydrothermal approach for electrochemical oxygen evolution reaction.

Residuals have rarely been granted attention when employing a hydrothermal approach to prepare binder-free supported catalysts. Using Ni foam supported NiCo2O4 catalyst for oxygen evolution reaction as an example, it was found that the catalytic activity of NiCo2O4 from the residuals loaded on glass carbon is comparable to Ni foam supported NiCo2O4, while the specific activity and turnover frequency value of the former catalyst are many times higher than that of the supported catalyst. In view of sustainabi...

Effect of Hydrothermal Treatment on Structural and Catalytic Properties of CTA-MCM-41 Silica.

The [CTA]-MCM-41 hybrid silica is a useful and simply prepared heterogeneous basic catalyst for the transesterification reaction. Here, the effect of hydrothermal treatment during catalyst preparation was investigated, with the aim of improving the structural stability of this catalyst during the reaction. It was observed that the hydrothermal step led to the formation of a material with a higher degree of organization and a greater wall thickness, which improved its structural stability. However, the catal...


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