ArticleThe journal of physical chemistry letters2026
Molecular Surface Chemistry Drives Anomalous Clustering of Ultrasmall Silica Nanoparticles.
Article in The journal of physical chemistry letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Silica nanoparticles are expected to remain stable at alkaline pH because deprotonated silanol groups lead to a strong electrostatic interparticle repulsion. Here, we show that this mean-field expectation fails for ultrasmall silica nanoparticles. Electron microscopy, dynamic light scattering, and small-angle X-ray scattering (SAXS) show that 9 nm silica nanoparticles form finite equilibrium clusters at pH 8.7, whereas larger particles remain dispersed under identical conditions. Analysis of SAXS profiles demonstrate that interactions between smaller nanoparticles cannot be described by typical screened electrostatics alone and require an additional short-range attractive contribution. Surface-sensitive measurements show that decreasing particle size increases hydroxylated silanol groups, alters interfacial charge density, and enhances the contribution of higher-p
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