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PubMed Journals Articles About "Lightweight Catalyst Artificial Photosynthesis" RSS

09:19 EDT 19th September 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 2,800+

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...

Metal-free Fluorine Interlayer Doped Carbon Electrocatalyst for CO₂ Reduction Outcompeting Hydrogen Evolution.

Electrochemical carbon dioxide reduction (ECDRR), as a key reaction in artificial photosynthesis to implement renewable energy conversion/storage, has been inhibited by the low efficiency and high cost of electrocatalysts. Herein, we synthesize a fluorine interlayer doped carbon (FC) catalyst which enables the highly selective CO₂-to-CO conversion with enhanced partial current density of CO (ca. 250,000 times) and suppressed H₂ (ca. 1/5) on FC than pristine carbon. Concluded from experimental analysis a...

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 ...

Design of a Lightweight Soft Robotic Arm Using Pneumatic Artificial Muscles and Inflatable Sleeves.

As robots begin to interact with humans and operate in human environments, safety becomes a major concern. Conventional robots, although reliable and consistent, can cause injury to anyone within its range of motion. Soft robotics, wherein systems are made to be soft and mechanically compliant, are thus a promising alternative due to their lightweight nature and ability to cushion impacts, but current designs often sacrifice accuracy and usefulness for safety. We, therefore, have developed a bioinspired rob...

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.

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...

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...

C4-like Photosynthesis has Important Functions in C3 Plant Vasculature.

In C4 plants, the vascularization of the leaf is extended to include a ring of photosynthetic bundle sheath cells, which have essential and specific functions. In contrast to the substantial knowledge of photosynthesis in C4 plants, relatively little is known about photosynthesis in C3 plant veins, which differs substantially from that in C3 mesophyll cells. In this review we highlight the specific photosynthetic machinery present in C3 vascular cells that likely evolved prior to the divergence between C3 a...

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...

Journal of Artificial Organs 2017: the year in review : Journal of Artificial Organs Editorial Committee.

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...

Artificial selection increased body weight but induced increase of runs of homozygosity in Hanwoo cattle.

Artificial selection has been demonstrated to have a rapid and significant effect on the phenotype and genome of an organism. However, most previous studies on artificial selection have focused solely on genomic sequences modified by artificial selection or genomic sequences associated with a specific trait. In this study, we generated whole genome sequencing data of 126 cattle under artificial selection, and 24,973,862 single nucleotide variants to investigate the relationship among artificial selection, g...

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...

Microwave-assisted catalytic pyrolysis of moso bamboo for high syngas production.

Microwave-assisted pyrolysis of moso bamboo with the activated carbon-supported iron(III) ion catalyst was carried out with the aim of obtaining high quality and quantity syngas(H + CO). The effect of the catalyst on moso bomboo pyrolysis involving the temperature-rising characteristics, product distribution, tar conversion and gas compositions were investigated. The results indicated that the catalyst improved the microwave-absorption capability and increased the maximum reaction temperatures. The form...

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...

Transcatheter heart valve for aortic valve implantation: republication of the article published in the Japanese Journal of Artificial Organs.

This review was created based on a translation of the Japanese review first reported in the Japanese Journal of Artificial Organs in 2015 (vol. 44, no. 3, pp. 136-140), with some modifications.

Excellent activity and selectivity of one-pot synthesized Cu-SSZ-13 catalyst in the selective catalytic oxidation of ammonia to nitrogen.

One-pot synthesized Cu-SSZ-13 catalyst treated with dilute HNO3 achieved superior activity and selectivity in the selective catalytic oxidation (SCO) of NH3 to nitrogen, in comparison with other zeolite-based catalysts and most of metal-oxide catalysts. Furthermore, the catalyst showed the similar or even higher catalytic activity than the partial noble-metal catalysts, and meanwhile its N2 selectivity was superior to most noble-metal catalysts. The characterization results demonstrated that more Cu2+ ions ...

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...

Photocatalytic CO2 reduction on TiO2-based materials under controlled reaction conditions: Systematic insights from a literature study.

Photocatalytic CO₂ conversion to hydrocarbons (sometimes referred to as 'artificial photosynthesis'), which mimics natural photosynthesis with purely inorganic photocatalysts, has the potential to simultaneously combat the energy crisis and the greenhouse effect. In more than half of all reported studies to date, TiO₂-based materials are used as photocatalyst. Yet, the reaction conditions and reactor designs employed in previous studies cover a vast range, hindering mutual comparisons of observed activi...


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