Results 101 to 110 of about 587,711 (268)

Impact of A‐Site Sr Substitution in LaFeO3 on Syngas Selectivity During Chemical Looping Dry Reforming of Methane (CL‐DRM)

open access: yesChemistry – A European Journal, EarlyView.
Sr doping regulates oxygen exchange and methane activation in LaFeO3, suppressing nonselective CH4 cracking and coke formation during CL‐DRM. La0.7Sr0.3FeO3 provides the optimal balance, delivering ∼40% CH4 conversion, an H2/CO ratio of 2, and >95% carbon balance.
Ganesh Jabotra   +8 more
wiley   +1 more source

Base‐Free Nickel‐Catalyzed Three‐Component Coupling of Aldehydes, Butadiene, and Malonate Derivatives: Toward Sustainable Synthesis of Highly Functionalized Molecules

open access: yesEuropean Journal of Organic Chemistry, EarlyView.
A nickel‐catalyzed three‐component reaction between arylaldehydes, butadiene, and malonates is developed yielding high functionalized homoallylic alcohols in a single step. No additional base is required and the reaction shows broad substrates compatibility with yields up to 96% and an exclusive selectivity toward the linear E‐isomer.
Anthony Saint Pol   +7 more
wiley   +1 more source

Mémo visuel de chimie générale

open access: yes, 2019
National audienceCet aide-mémoire en couleur présente sous une forme visuelle l'essentiel des notions fondamentales et concepts clés de la chimie générale à connaître en vue des examens et des concours.
Filhol, Jean-Sébastien   +4 more
core  

Food Contamination and Safety in Nigeria: A Systematic Synthesis of Heavy Metals, Microbial Pathogens, and Health Risk Metrics

open access: yesFood Safety and Health, EarlyView.
This is an infographic driver of food contaminants and health effects. ABSTRACT Food safety remains a critical challenge in Nigeria due to rapid urbanization and weak regulatory enforcement. This systematic review synthesizes empirical evidence from 2015 to 2025 to characterize food contaminant profiles and associated human health risks in Nigeria ...
Cecilia Nwadiuto Obasi   +6 more
wiley   +1 more source

Chain‐End Grafting of RAFT Polyelectrolyte Macroligands to Stabilize Near‐Infrared‐Emitting Gold Nanoclusters

open access: yesMacromolecular Rapid Communications, EarlyView.
Surface‐functionalized gold nanoclusters (AuNCs) are synthesized in situ by chain‐end grafting of RAFT polyelectrolytes at room temperature directly in water. It leads to highly stable polymer‐AuNCs nanohybrids emitting near‐infrared photoluminescence with µs lifetimes. ABSTRACT With their photoluminescence properties, gold nanoclusters (AuNCs, d<2 nm)
Bárbara Casteleiro   +7 more
wiley   +1 more source

Exploring a Ugi‐Mediated Polymerization‐Induced Self‐Assembly Approach to Peptoid Particles

open access: yesMacromolecular Rapid Communications, EarlyView.
Ugi‐mediated polymerization‐induced self‐assembly (U‐PISA) enables the one‐pot synthesis of PEG‐stabilized polypeptoid nanoparticles under mild aqueous conditions. By tuning PEG molar mass and feed composition, tunable spherical and worm‐like nano‐objects are obtained.
Thi Phuong Thu Nguyen   +8 more
wiley   +1 more source

Experimental and field evidence indicate that islet‐nesting tundra birds experience reduced nest predation and benefit indirectly from high snow goose densities

open access: yesOikos, EarlyView.
Landscape features can shape the occurrence and strength of predator–prey interactions by influencing predation risk and prey distribution. In the High Arctic, some bird species select nesting sites with physical features that impede access for their main terrestrial predator, the Arctic fox.
Marylou Beaudoin   +6 more
wiley   +1 more source

Chimie des substances naturelles et chimie de l'environnement

open access: yes, 2013
National audienceCet article résume, de manière non exhaustive, de récents travaux de recherche menés au sein de laboratoires académiques de la région PACA dans des domaines de la chimie étroitement liés au milieu naturel, à savoir la chimie des ...
Culioli, Gérald   +1 more
core   +1 more source

Chimie [PDF]

open access: yesLa Houille Blanche, 1910
openaire   +1 more source

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