Structural and Thermodynamic Peculiarities of Core-Shell Particles at Fluid Interfaces from Triangular Lattice Models
Open Access
- 26 October 2020
- Vol. 22 (11), 1215
- https://doi.org/10.3390/e22111215
Abstract
A triangular lattice model for pattern formation by core-shell particles at fluid interfaces is introduced and studied for the particle to core diameter ratio equal to 3. Repulsion for overlapping shells and attraction at larger distances due to capillary forces are assumed. Ground states and thermodynamic properties are determined analytically and by Monte Carlo simulations for soft outer- and stiffer inner shells, with different decay rates of the interparticle repulsion. We find that thermodynamic properties are qualitatively the same for slow and for fast decay of the repulsive potential, but the ordered phases are stable for temperature ranges, depending strongly on the shape of the repulsive potential. More importantly, there are two types of patterns formed for fixed chemical potential—one for a slow and another one for a fast decay of the repulsion at small distances. In the first case, two different patterns—for example clusters or stripes—occur with the same probability for some range of the chemical potential. For a fixed concentration, an interface is formed between two ordered phases with the closest concentration, and the surface tension takes the same value for all stable interfaces. In the case of degeneracy, a stable interface cannot be formed for one out of four combinations of the coexisting phases, because of a larger surface tension. Our results show that by tuning the architecture of a thick polymeric shell, many different patterns can be obtained for a sufficiently low temperature.This publication has 17 references indexed in Scilit:
- Stable in Bulk and Aggregating at the Interface: Comparing Core–Shell Nanoparticles in Suspension and at Fluid InterfacesLangmuir, 2017
- Two-dimensional assemblies of soft repulsive colloids confined at fluid interfacesEurophysics Letters, 2017
- Compression of hard core–soft shell nanoparticles at liquid–liquid interfaces: influence of the shell thicknessSoft Matter, 2016
- Fully Tunable Silicon Nanowire Arrays Fabricated by Soft Nanoparticle TemplatingNano Letters, 2015
- Hollow and Core–Shell Microgels at Oil–Water Interfaces: Spreading of Soft Particles Reduces the Compressibility of the MonolayerLangmuir, 2015
- Time‐Controlled Colloidal Superstructures: Long‐Range Plasmon Resonance Coupling in Particle MonolayersAdvanced Materials, 2015
- Tunable plasmonic surfaces via colloid assemblyJournal of Materials Chemistry C, 2015
- Cross-Linking Density and Temperature Effects on the Self-Assembly of SiO2-PNIPAAm Core-Shell Particles at InterfacesChemistry – A European Journal, 2013
- Coarse-Graining of Ionic Microgels: Theory and ExperimentZeitschrift für Physikalische Chemie, 2012
- Ordered Arrays of Gold Nanostructures from Interfacially Assembled Au@PNIPAM Hybrid NanoparticlesLangmuir, 2012