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The Effect of Deep Cryogenic Treatment on the Electrocatalytic Performance of a Pd@CFs Catalyst for Methanol Oxidation.
Nanomaterials (Basel)
February 2025
School of Materials Science and Engineering, Xi'an Key Laboratory of Textile Composites, Xi'an Polytechnic University, Xi'an 710048, China.
To enhance the electrocatalytic performance of a flexible Pd@CFs catalyst for methanol oxidation, deep cryogenic treatment in liquid nitrogen was introduced. The effects of the frequency and time of the deep cryogenic treatment on the surface crystal orientation, microstructure morphology, mechanical performance, and electrocatalytic performance for methanol oxidation were studied. The results showed that when the frequency of the deep cryogenic treatment was 2 times and the deep cryogenic time was 24 h, the electrocatalytic performance of the catalyst was the best.
View Article and Find Full Text PDFMolecular Dynamics Simulation Study on the Influence of Twin Spacing and Temperature on the Deformation Behavior of Nanotwinned AgPd Alloy.
Nanomaterials (Basel)
February 2025
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
This study employs molecular dynamics simulations to unravel the interplay between twin spacing, temperature, and mechanical response in nanotwinned AgPd alloys. For fine-grained systems, a dual strengthening-softening transition emerges as twin spacing decreases, driven by a shift in dislocation behavior from inclined-to-twin-boundary slip to parallel-to-twin-boundary glide. In contrast, coarse-grained configurations exhibit monotonic strengthening with reduced twin spacing, governed by strain localization at grain boundaries and suppressed dislocation activity.
View Article and Find Full Text PDFEnhancing cryopreservation of human induced pluripotent stem cells: Bottom-up versus conventional freezing geometry.
Biotechnol Prog
March 2025
Centre of Marine Sciences (CCMAR/CIMAR LA), Campus de Gambelas, Universidade do Algarve, Faro, Portugal.
Induced pluripotent stem cells (iPSCs) hold large potential in regenerative medicine due to their pluripotency and unlimited self-renewal capacity without the ethical issues of embryonic stem cells. To provide quality-controlled iPSCs for clinical therapies, it is essential to develop safe cryopreservation protocols for long-term storage, preferably amenable to scale-up and automation. We have compared the impact of two different freezing geometries (bottom-up and conventional radial freezing) on the viability and differentiation potential of human iPSCs.
View Article and Find Full Text PDFMechanistic basis for PYROXD1-mediated protection of the human tRNA ligase complex against oxidative inactivation.
Nat Struct Mol Biol
March 2025
Department of Biochemistry, University of Zurich, Zurich, Switzerland.
The metazoan tRNA ligase complex (tRNA-LC) has essential roles in tRNA biogenesis and unfolded protein response. Its catalytic subunit RTCB contains a conserved active-site cysteine that is susceptible to metal ion-induced oxidative inactivation. The flavin-containing oxidoreductase PYROXD1 preserves the activity of human tRNA-LC in a NAD(P)H-dependent manner, but its protective mechanism remains elusive.
View Article and Find Full Text PDFDesigning polymersomes with surface-integrated nanoparticles through hierarchical phase separation.
Nat Commun
March 2025
Bio-Organic Chemistry, Department of Chemical Engineering and Chemistry, Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, Eindhoven, The Netherlands.
Polymersomes with surface-integrated nanoparticles, in which a smaller sphere is attached to a larger capsule, are typically formed through complex processes like membrane deformation, polymerization, or membrane functionalization. This complexity restricts facile application of this unusual topology, for example in drug delivery or nanomotor science. Our study introduces a robust method for crafting polymersomes with surface-integrated nanoparticles using a hierarchical phase separation approach.
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