Chirality-Dependent Magnetization of Colloidal Squares with Offset Magnetic Dipoles

Journal of Chemical Theory and Computation, Год журнала: 2025, Номер unknown

Опубликована: Март 5, 2025

Colloidal particles with anisotropic geometries and interactions display rich phase behavior hence have the potential to serve as basis of functional materials, which can tunably reversibly self-assemble into different configurations. External fields are one design parameter that be used manipulate how systems colloidal assemble another. One challenge in designing new materials using is understanding an individual particle's various features, like geometry, affect their overall self-assembly. Here, we present results simulation studies explore self-assembly 2D squares offset magnetic dipoles presence external field. Annealing simulations measure equilibrium-phase these ground state, when dominate over thermal forces system. We find properties strongly influenced by relative number opposite "handedness", or chirality, within Systems contain equal numbers either chirality extremely responsive field; a relatively weak field required magnetize them. In contrast, only significantly less stronger elicit same response. Ultimately, differing macroscopic related microscopic Simulation snapshots state diagrams illustrate absence prevents from leaving energetically favorable antiparallel configuration When present, head-to-tail configuration, therefore inducing state.

Язык: Английский

Numerical Simulations of Colloidal Dimer Assembly into Chiral Clusters and Crystals under Combined Electric and Magnetic Fields

Langmuir, Год журнала: 2025, Номер unknown

Опубликована: Апрель 7, 2025

The directed assembly of colloidal particles into ordered structures is crucial for developing advanced functional materials. In this study, we perform Brownian dynamics simulations to investigate the active self-propelling dimers under orthogonally applied electric and magnetic fields. We systematically explore effects dimer geometry, electrohydrodynamic interactions, field strengths on formation chiral clusters their hierarchical assemblies. By tuning these parameters, can achieve precise control over cluster size chirality, providing a method assembling monodisperse with defined handedness. Furthermore, utilize assembled construct crystals, where global chirality emerges from local packing arrangements, even when individual are achiral. This ability dynamically manipulate using external fields presents promising route toward designing programmable architectures, potential applications in optical metamaterials, microrobotics, reconfigurable soft matter systems.

Язык: Английский