The solidification of AgCo, AgNi, and AgCu nanodroplets is studied by molecular dynamics simulations in the size range of 2-8 nm. All these systems tend to phase separate in the bulk solid with surface segregation of Ag. Despite these similarities, the simulations reveal clear differences in the solidification pathways. AgCo and AgNi already separate in the liquid phase, and they solidify in configurations close to equilibrium. They can show a two-step solidification process in which Co-/Ni-rich parts solidify at higher temperatures than the Ag-rich part. AgCu does not separate in the liquid and solidifies in one step, thereby remaining in a kinetically trapped state down to room temperature. The solidification mechanisms and the size dependence of the solidification temperatures are analyzed, finding qualitatively different behaviors in AgCo/AgNi compared to AgCu. These differences are rationalized by an analytical model.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9836354 | PMC |
| http://dx.doi.org/10.1021/acsnano.2c09741 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Transient Viscosity Adjustment Using a Coaxial Nozzle for Electrospinning Nanofibers from Non-Spinnable Pure -Poly(hydroxyamide).
Polymers (Basel)
December 2024
School of Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea.
In this study, a transient viscosity adjustment method using a coaxial nozzle was explored to fabricate nanofibers from non-spinnable -poly(hydroxyamide) (-PHA). Unlike conventional electrospinning methods that often require additives to induce fiber formation, this approach relies on a sheath-core configuration, introducing tetrahydrofuran (THF) to the sheath to temporarily adjust solution viscosity. The diffusion of THF into the core -PHA solution resulted in momentary solidification at the interface, promoting nanofiber formation without compromising polymer solubility.
View Article and Find Full Text PDFDesigning Multi-functional Separators With Regulated Ion Flux and Selectivity for Macrobian Zinc Ion Batteries.
Small
December 2024
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Lab of Graphene (NPU), Xi'an, 710072, China.
The success of achieving scale-up deployment of zinc ion batteries is to selectively regulate the rapid and dendrite-free growth of zinc anodes. Herein, this is proposed that a creative design strategy of constructing multi-functional separators (MFS) to stabilize the zinc anodes. By in situ decorating metal-organic-framework coating on commercial glass fiber, the upgraded separator is of remarkable benefit for strong anion (SO ) anchoring, uniform ion flux across the interface, and boosted Zn desolvation.
View Article and Find Full Text PDFNanosheet architecture of MnO/carbon with improved reaction kinetics toward advanced zinc energy storage.
J Colloid Interface Sci
October 2023
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Lab of Graphene (NPU), Xi'an 710072, China. Electronic address:
Article Synopsis
- Aqueous zinc ion batteries (AZIBs) are promising for large-scale energy storage due to their safety and cost-effectiveness.
- The conventional cathode material, MnO, struggles with poor performance because of its low conductivity and fragility.
- A new MnO/carbon nanosheet design improves reaction speed and durability, achieving high capacity and excellent cycling lifespan, which can enhance future AZIB development.
Formation, chemical evolution and solidification of the dense liquid phase of calcium (bi)carbonate.
Nat Mater
January 2025
Physical and Computational Sciences, Pacific Northwest National Laboratory, Richland, WA, USA.
Metal carbonates, which are ubiquitous in the near-surface mineral record, are a major product of biomineralizing organisms and serve as important targets for capturing anthropogenic CO emissions. However, pathways of carbonate mineralization typically diverge from classical predictions due to the involvement of disordered precursors, such as the dense liquid phase (DLP), yet little is known about DLP formation or solidification processes. Using in situ methods we report that a highly hydrated bicarbonate DLP forms via liquid-liquid phase separation and transforms into hollow hydrated amorphous CaCO particles.
View Article and Find Full Text PDFMutability of Nucleation Particles in Reactive Salt Hydrate Phase Change Materials.
J Phys Chem C Nanomater Interfaces
October 2024
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States.
Nucleation particles, solid phases dispersed throughout a medium to decrease the energy barrier for solidification or other reversible phase transitions, are generally selected on the basis of structural or interfacial energy considerations between the host phase and the solid phase that is crystallizing. However, the existence of chemical reactions between the nucleation particles and the host phase can obscure these underlying relationships, thereby complicating the process of selection of active nucleation particle phases. Here, we reveal the origin of nucleation activity of barium-based nucleation particles in the salt hydrate calcium chloride hexahydrate (CCH), a candidate for near room temperature thermal energy storage.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!