Silica/polystyrene bipod-like submicron colloids synthesized by seed-growth dispersion polymerisation as precursors for two-patch silica particles

Shanmugathasan, S.; Bagur, Auriane; Ducrot, Étienne; Buffière, Sonia; Oostrum, Peter D. J. van; Ravaine, Serge; Duguet, Étienne

doi:10.1016/j.colsurfa.2022.129344

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…In analogy to the directional interactions between atoms and molecules, people have provided colloidal particles with directional interactions [9][10][11][12][13][14][15][16]. In many cases this was achieved by modifying the surface chemistry of the particles in an inhomogeneous or patchy manner [17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of patchy particles using gaseous ligands

Virk¹,

Beitl²,

Oostrum³

2023

J. Phys.: Condens. Matter

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The collective self-assembly of colloidal particles can be influenced by the composition of the suspending medium, the bulk material of the particles themselves and, importantly, by their surface chemistry. This can be inhomogeneous or patchy to give an orientational dependence to the interaction potential between the particles. These additional constraints to the energy landscape then steer the self-assembly towards configurations of fundamental or applicational interest. We present a novel approach to modify the surface chemistry of colloidal particles to give them two polar patches, using gaseous ligands. In particular, we synthesize polar inverse patchy colloids, i.e., charged particles with two (fluorescent) patches of the opposite charge on their poles. We characterize the dependence of these charges on the pH of the suspending solution.

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Section: Introductionmentioning

confidence: 99%

Synthesis of patchy particles using gaseous ligands

Virk¹,

Beitl²,

Oostrum³

2023

J. Phys.: Condens. Matter

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Liquid-liquid phase separation driven by charge heterogeneity

Notarmuzi,

Bianchi

2024

Commun Phys

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Despite the intrinsic charge heterogeneity of proteins plays a crucial role in the liquid-liquid phase separation (LLPS) of a broad variety of protein systems, our understanding of the effects of their electrostatic anisotropy is still in its early stages. We approach this issue by means of a coarse-grained model based on a robust mean-field description that extends the DLVO theory to non-uniformly charged particles. We numerically investigate the effect of surface charge patchiness and net particle charge on varying these features independently and with the use of a few parameters only. The effect of charge anisotropy on the LLPS critical point is rationalized via a thermodynamic-independent parameter based on orientationally averaged pair properties, that estimates the particle connectivity and controls the propensity of the liquid phase to condensate. We show that, even though directional attraction alone is able to lower the particle bonding valence—thus shifting the critical point towards lower temperatures and densities—directional repulsion significantly and systematically diminishes the particle functionality, thus further reducing the critical parameters. This electrostatically-driven shift can be understood in terms of the additional morphological constraints introduced by the directional repulsion, that hinder the condensation of dense aggregates.

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Silica/polystyrene bipod-like submicron colloids synthesized by seed-growth dispersion polymerisation as precursors for two-patch silica particles

Cited by 2 publications

References 29 publications

Synthesis of patchy particles using gaseous ligands

Synthesis of patchy particles using gaseous ligands

Liquid-liquid phase separation driven by charge heterogeneity

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