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High-Density and Well-Aligned Hierarchical Structures of Colloids Assembled under Orthogonal Magnetic and Electric Fields.
ACS Nano
January 2025
Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado 80401, United States.
Colloids can be used either as model systems for directed assembly or as the necessary building blocks for making functional materials. Previous work primarily focused on assembling colloids under a single external field, where controlling particle-particle interactions is limited. This work presents results under a combination of electric and magnetic fields.
View Article and Find Full Text PDFPolyfluoroalkanoic Acids as Fluoroalkylating Reagents: Strategy for Direct Access to R-Embedded Amides.
Org Lett
January 2025
Laboratory of Catalysis and Organic Synthesis, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.
Herein, we have reported the application of bench stable perfluoroalkanoic acids as fluoro-alkylating reagents in combination with DIB and primary amides for sequential one-pot transformation to R-embedded functionalized amides under metal-free conditions. The protocol is tolerant to a range of sensitive functional groups (>33 examples and up to 90% yield), and perfluoro acids. Preliminary mechanistic studies, control experiments, in situ F-NMR analyses, and the synthesis of intermediate species were performed to understand the reaction pathways.
View Article and Find Full Text PDFUnveiling the Oxidation Mechanisms of High-entropy Carbides Through Atomic-scale Dynamic Observation.
Adv Mater
January 2025
School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China.
Understanding the behavior of high-entropy carbides (HECs) under oxygen-containing environments is of particular importance for their promising applications in structural components, catalysis, and energy-related fields. Herein, the structural evolution of (Ta, Ti, Cr, Nb)C (HEC-1) nanoparticles (NPs) is tracked in situ during the oxidation at the atomic scale by using an open-cell environmental aberration-corrected scanning transmission electron microscope. Three key stages are clearly discerned during the oxidation of HEC-1 NPs at the atomic level below 900 °C: i) increased amorphization of HEC-1 NPs from 300 to 500 °C due to the energetically favorable formation of carbon vacancies and substitution of carbon with oxygen atoms; ii) nucleation and subsequent growth of locally ordered nanocluster intermediates within the generated amorphous oxides from 500 to 800 °C; and iii) final one-step crystallization of non-equimolar MeO and MeO (Me = metallic elements, Ta, Ti, Cr, and Nb) high-entropy oxides above 800 °C, accompanied with the reduction in atomic defects.
View Article and Find Full Text PDFConformational effects in the identification and quantification of ketohydroperoxides in the oxidation of -pentane.
Phys Chem Chem Phys
January 2025
Université de Lorraine, CNRS, LRGP, F-54000 Nancy, France.
Stereochemistry plays a key role in both fundamental chemical processes and the dynamics of a large set of molecular systems of importance in chemistry, medicine and biology. Predicting the chemical transformations of organic precursors in such environments requires detailed kinetic models based on laboratory data. Reactive intermediates play a critical role in constraining the models but their identification and especially their quantification remain challenging.
View Article and Find Full Text PDFIntroduction: Moderate to severe tricuspid regurgitation (TR) in the setting of acute heart failure (AHF) has been found to be associated with worse clinical outcomes. Recently, the TRI-SCORE was developed to predict clinical outcomes after isolated tricuspid surgery.
Objectives: To determine whether this score could aid in risk stratification of AHF patients with moderate-severe TR.
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