Nanosized Particles Made in Colloidal Assemblies

TLDR

Parameters such as colloidal assembly shape, head polar group hydration, and interfacial water molecules play a major role in nanoparticle synthesis. The article investigates how colloidal assembly templates control the size, shape, and polydispersity of nanosized particles. The study finds that colloidal assembly chemistry differs from homogeneous solutions, allowing size selection and reduced polydispersity via surface treatment, and enabling formation of mono‑ and multilayer nanoparticles that crystallize into a 3D face‑centered cubic superlattice.

Abstract

In this feature article, syntheses of nanosized particles by using colloidal assemblies as a template are described. We asked ourselves the following question: What parameters play a role in the control of the size, shape, and polydispersity? We know that parameters such as the shape of colloidal assemblies, the hydration of the head polar group, the water molecules bounded to the interface, etc. play a major role. However, there are a number of exceptions preventing any generalization. It is shown that the chemical mechanism in nanoparticles production in colloidal assemblies can differ from those usually observed in homogeneous solution. This shows that the solution chemistry cannot always be transferred to colloidal systems. It is possible to select the size and markedly reduce the polydispersity by a surface treatment of the nanoparticles. This favors formation of mono- and multilayers made of nanoparticles, and it is found that these particles form crystals organized in a three-dimensional face-centered cubic superlattice.