Deformability and solvent penetration in soft nanoparticles at liquid-liquid interfaces

Journal of Colloid and Interface Science
Daniel J Arismendi-Arrieta, Angel J Moreno

Abstract

The internal topology of soft nanoparticles - regular (ideal) vs disordered (realistic) networks - and its intrinsic deformability (degree of cross-linking) influences solvent permeability (uptake, invasive and mixing capacities) under interfacial confinement. By means of large-scale molecular dynamics simulations we study nanogels at liquid-liquid (A-B) interfaces covering the whole range of cross-linking degrees and interfacial strengths. The nanogel permeability is analyzed with a grid representation that accounts for the surface fluctuations and adds to the density profiles the exact number of liquid particles inside the nanogel. Unlike in previous investigations, excluded volume interactions are considered for all the particles (monomers and liquids). Nanogel's permeability is intrinsically related to the particle deformability. Ideal networks show higher values of the total liquid uptake and the invasive capacity (A-particles in B-side and vice versa) than realistic networks, though differences vanish in the limit of rigid interfaces. Uptake and invasion are optimized at a cross-linking degree that depends on the interfacial strength, tending to ~15-20% for moderate and stiff interfaces. As the interfacial strength increa...Continue Reading

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Citations

Aug 29, 2020·Soft Matter·Hadi MehrabianJens Harting
Oct 30, 2020·Soft Matter·Maarten WoutersJens Harting

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