Growth Mechanism Deconvolution of Self-Limiting Supraparticles Based on Microfluidic System

Abstract

The synthesis of colloidal supraparticles (SPs) based on self-assembly of nanoscopic objects has attracted much attention in recent years. Here, we demonstrate the formation of self-limiting monodisperse gold SPs with core-shell morphology based on the building blocks of flexible nanoarms in one step. A flow-based microfluidic chip is utilized to slow down the assembly process of the intermediates, which surprisingly allows for observation of ultrathin gold nanoplates as first intermediates. Notably, these intermediate cannot be observed in traditional synthesis due to their rapid rolling-up to form the second-order nanostructure of flexible hollow nanoarms. The growth mechanism of SPs can then be deconvoluted into two seed-mediated steps. Monte Carlo simulations confirm that the self-limiting growth of binary SPs is governed by a balance between electrostatic repulsion and van der Waals attraction.

Hydrothermal synthesis of gold polyhedral nanocrystals by varying surfactant concentration and their LSPR and SERS properties

“…A systematic shape evolution scheme of the polyhedral Au NCs is illustrated in Fig. 35,42,51 And the etching effect also caused dissolving of the higher active multiply and twinned crystals while remaining single-crystal particles. Actually, CTAB molecules were represented as micelles in solution and adsorbed on the {100} facets of gold nuclei to lower the energies of {100} facets and slow the growth of that face for the exposed of the {100} facets.…”

“…18,19 Recently, great efforts have been made to search for the method of fabricating a multiplicity of geometric structures of noble metal NCs, [20][21][22] such as cube, 23 triangular, 24 prism, 25 sphere 26 and rod. 16,27,28 For example, the synthesis of complicated polyhedral NCs, [29][30][31][32][33][34][35] including platonic solids 36 (tetrahedron, cube, octahedron, dodecahedron, and icosahedron) and Archimedean solids 26 (cuboctahedron, truncated cuboctahedron, truncated octahedron and truncated tetrahedron). 16,27,28 For example, the synthesis of complicated polyhedral NCs, [29][30][31][32][33][34][35] including platonic solids 36 (tetrahedron, cube, octahedron, dodecahedron, and icosahedron) and Archimedean solids 26 (cuboctahedron, truncated cuboctahedron, truncated octahedron and truncated tetrahedron).…”

Self‐Assembly of CoPt Magnetic Nanoparticle Arrays and its Underlying Forces

“…Self‐assembly of nanoparticles (NPs) into ordered structures is of interest in both science and technology . A 2D superlattice has attracted much attention due to its superior properties compared with NP building blocks.…”

In vivo high-efficiency targeted photodynamic therapy of ultra-small Fe3O4@polymer-NPO/PEG-Glc@Ce6 nanoprobes based on small size effect

“…21 Generally, the size and shape of inorganic nanomaterials is related to the lattice rearrangement of the surface atoms to minimize the surface tension and Gibb's free energy. [22][23][24] The micro/nano-structural, or intrinsic, size governs a significant change to the bulk material's properties. 25 Therefore, some researchers have heavily focused on correlation studies between nanoparticle size and biological effect on siRNA-based therapeutics 26 or nanodelivery systems.…”