Results 31 to 40 of about 26,315 (251)

COMPARAÇÃO ENTRE TÉCNICAS DE EXTRAÇÃO DE HIDROCARBONETOS POLICÍCLICOS AROMÁTICOS EM TECIDOS HEPÁTICO E ADIPOSO DE TETRÁPODES MARINHOS E AVALIAÇÃO DA HETEROGENEIDADE DOS TECIDOS

Química Nova
For the evaluation of PAH extraction techniques in adipose and liver tissues of marine tetrapod, samples of some species (Pontoporia blainvillei, Chelonia mydas, Thalassarche melanophris, and Balaenoptera brydei) were spiked with PAH standards and ...
Rafael André Lourenço, Satie Taniguchi, Josilene da Silva, Patrick Simões Dias, Márcia Caruso Bícego   +4 more
doaj   +1 more source

A Reliable Strategy to Unravel the Structure and Composition of Semiconducting Conjugated Donor‐Acceptor Block Copolymers

Advanced Science, EarlyView.
This work proposes a reliable strategy to elucidate the structure and composition of conjugated donor‐acceptor block copolymers. The method, based on NMR analysis, allows to extract key structural information such as the number of heterojunctions (NoH) and the number of blocks (NoB) of the copolymers.
Antoine Curé, Pierre‐Alain Bayle, Lucie Rivet, Yann Kervella, Renaud Demadrille, Cyril Aumaître   +5 more
wiley   +1 more source

High‐Performance Recycling Biobased Photopolymers for 3D Printing

Advanced Science, EarlyView.
By using biobased phenols like eugenol, novel biobased photopolymers containing dissociative phenol‐carbamate bonds are designed for 3D printing. Meanwhile, a “mixed‐monomer assisted recycling” strategy is proposed to recycle the materials. The resulting materials not only achieve high‐performance and excellent chemical recyclability simultaneously ...
Hang Zhou, Yi Tan, Chuanwei Lu, Yanlin Li, Tianyi Tang, Zheng Yang, Ying Li, Xuehan Chen, Jianfeng Yao, Zhengchun Cai, Yuanyuan Jiang, Ping Zhao, Chengguo Liu   +12 more
wiley   +1 more source

Helicalization of Covalent Organic Framework Nanofibers with Amplified Spin Polarizability for Boosting Photocatalytic Hydrogen Evolution

Advanced Science, EarlyView.
A non‐covalent chirality‐induced strategy via chiral solvents is presented to synthesize helical 2D COF nanofibers with high crystallinity, high chirality, and high spin polarization. The helical structure enhances the concentration of photogenerated charges, suppresses exciton recombination, and extends carrier lifetimes, thereby significantly ...
Qi Zhong, Yongtu Tian, Yutao Sang, Changchun Wang, Jia Guo   +4 more
wiley   +1 more source

Improved Direct Ink Writing of Liquid Metal Foams via Liquid Additives

Advanced Electronic Materials, EarlyView.
The ability to pattern liquid metal is useful for making soft electrical and thermal devices. Dispensing liquid metal from a nozzle naturally results in the formation of spheroidal droplets, making direct‐write printing challenging. Liquid metal foams containing pockets of air can extrude as filaments, albeit inconsistently.
Febby Krisnadi, Tushar Sakorikar, Man Hou Vong, Michael D. Dickey   +3 more
wiley   +1 more source

Impact of Extraction Methods on Total Phenolic and Flavonoid Contents, Antioxidant and Antihypoxic Properties of Allium ampeloprasum in Mice

Journal of Mazandaran University of Medical Sciences, 2018
Background and purpose: Allium (Liliaceae) genus has about 600 spp. This investigation was designed to study the impact of extraction methods on total phenolic and flavonoid contents, antioxidant, and antihypoxic properties of A.
Razieh Shahnazi, Fariborz Mehrdadfar, Mohammad Ali Ebrahimzadeh   +2 more
doaj  

Zweidimensionale Polymere als modulare metallfreie Festkörperkatalysatoren für die effiziente sono‐piezo‐photokatalytische Wasserstoffperoxidherstellung

Angewandte Chemie, EarlyView.
Diese Studie demonstriert die hohe piezo‐photokatalytische Aktivität von festen molekulare Katalysatoren (Englisch: Solid Molecular Catalysts, SMCs) bei der Produktion von Wasserstoffperoxid aus Wasser und Sauerstoff. Durch den rationalen Entwurf der molekularen Motive (Diphenylpyridin oder Terpyridin) sowie der Rückgratfunktionalitäten (Methylgruppe ...
Sarah Brettschneider, Keanu V. A. Birkelbach, Marcus Lantzius‐Beninga, Ahmed Mourran, Gurudas Chakraborty, Peter J. C. Hausoul, Andreas Herrmann, Regina Palkovits   +7 more
wiley   +1 more source

Two‐Dimensional Polymers as Modular Metal‐Free Solid‐State Catalysts for Efficient Sono‐Piezo‐Photocatalytic Hydrogen Peroxide Production

Angewandte Chemie International Edition, EarlyView.
This study demonstrates the high piezo‐photocatalytic activity of solid molecular catalysts (SMCs) in the production of hydrogen peroxide from water and oxygen. Through the rational design of molecular motifs (diphenylpyridine or terpyridine) and backbone functionalities (methyl group, aliphatic amine antenna, or aromatic pyrrole unit), as well as ...
Sarah Brettschneider, Keanu V. A. Birkelbach, Marcus Lantzius‐Beninga, Ahmed Mourran, Gurudas Chakraborty, Peter J. C. Hausoul, Andreas Herrmann, Regina Palkovits   +7 more
wiley   +1 more source

Processability and Crosslink Density: Role of Peptizers in Natural Rubber and Chlorobutyl Rubber

Journal of Applied Polymer Science, EarlyView.
This work evaluates how chemical and physical peptizers affect mastication, vulcanization behavior, and network formation in natural rubber and chlorobutyl rubber. Size‐exclusion chromatography, rheometry, DSC, and swelling analyses demonstrate improved processability but reduced crosslink density with peptizer addition.
Amanda F. Baruel, Sérgio L. G. Petroni, Sandra A. C. de Mello, Jorge C. N. Dutra, Silvana N. Cassu   +4 more
wiley   +1 more source

Eco‐Friendly Synthesis of Cobalt Phthalocyanine for High‐Efficiency CO2${\rm CO}_{2}$ Electroreduction

Chemistry – A European Journal, EarlyView.
A sustainable synthesis of cobalt phthalocyanine (CoPc) using low‐impact solvents yields high‐performance electrocatalysts with reduced waste (E‐factor 18.6). When integrated into gas diffusion electrodes, CoPc achieves up to 12% Faradays efficiency for CO2‐to‐methanol and 65% CO2‐to‐CO conversion, aligning with state‐of‐the‐art materials and enabling ...
Gloria Zanotti, Federica Palmeri, Venanzio Raglione, Abdolhamid Khodadadi, Camille Tabaries, Jerome Capitolis, Mathieu Prevot, Laurent Piccolo, Mahmoud Zendehdel, Roberto Flammini, Giorgio Contini   +10 more
wiley   +1 more source