Shape‐Shifting Patchy Particles

Nucleation-and-growth processes are used extensively in the synthesis of spherical colloids, and more recently regiospecific nucleation-and-growth processes have been exploited to prepare more complex colloids such as patchy particles. We demonstrate that surface geometry alone can be made to play the dominant role in determining the final particle geometry in such syntheses, meaning that intricate chemical surface patternings are not required. We present a synthesis method for “lollipop”-shaped colloidal heterodimers (patchy particles), combining a recently published nucleation-and-growth technique with our recent findings that particle geometry influences the locus of droplet adsorption onto anisotropic template particles. Specifically, 3-methacryloxypropyl trimethoxysilane (MPTMS) is nucleated and grown onto bullet-shaped and nail-shaped colloids. The shape of the template particle can be chosen such that the MPTMS adsorbs regiospecifically onto the flat ends. In particular, we find that particles with a wider base increase the range of droplet volumes for which the minimum in the free energy of adsorption is located at the flat end of the particle compared with bullet-shaped particles of the same aspect ratio. We put forward an extensive analysis of the synthesis mechanism and experimentally determine the physical properties of the heterodimers, supported by theoretical simulations. Here we numerically optimize, for the first time, the shape of finite-sized droplets as a function of their position on the rod-like silica particle surface. We expect that our findings will give an impulse to complex particle creation by regiospecific nucleation and growth.

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“…This conclusion is also in full agreement with the recent beautiful results on “shape-shifting” colloids. 6 , 7 …”

Section: Resultsmentioning

confidence: 99%

Regiospecific Nucleation and Growth of Silane Coupling Agent Droplets onto Colloidal Particles

et al. 2017

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“…The hybridized DNA sticky ends between patches could be crosslinked [23] to fix the structures yielding free‐standing colloidal 2D superstructures. Reconfigurable materials are within reach given the possibility to add shape‐shifting particle design [24] . Our method should be expandable to 3D assemblies thereby fabricating 3D ordered open structures [25] …”

Section: Figurementioning

confidence: 99%

Two‐Dimensional (2D) or Quasi‐2D Superstructures from DNA‐Coated Colloidal Particles

et al. 2021

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This contribution describes the synthesis of colloidal di‐patch particles functionalized with DNA on the patches and their assembly into colloidal superstructures via cooperative depletion and DNA‐mediated interactions. The assembly into flower‐like Kagome, brick‐wall like monolayer, orthogonal packed single or double layers, wrinkled monolayer, and colloidal honeycomb superstructures can be controlled by tuning the particles’ patch sizes and assembly conditions. Based on these experimental results, we generate an empirical phase diagram. The principles revealed by the phase diagram provide guidance in the design of two‐dimensional (2D) materials with desired superstructures. Our strategy might be translatable to the assembly of three‐dimensional (3D) colloidal structures.

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“…Reconfigurable materials are within reach given the possibility to add shape-shifting particle design. [24] Our method should be expandable to 3D assemblies thereby fabricating 3D ordered open structures. [25] Figure 4.…”

Section: Zuschriftenmentioning

confidence: 99%

Two‐Dimensional (2D) or Quasi‐2D Superstructures from DNA‐Coated Colloidal Particles

et al. 2021

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Shape‐Shifting Patchy Particles

Cited by 45 publications

References 45 publications

Regiospecific Nucleation and Growth of Silane Coupling Agent Droplets onto Colloidal Particles

Regiospecific Nucleation and Growth of Silane Coupling Agent Droplets onto Colloidal Particles

Two‐Dimensional (2D) or Quasi‐2D Superstructures from DNA‐Coated Colloidal Particles

Two‐Dimensional (2D) or Quasi‐2D Superstructures from DNA‐Coated Colloidal Particles

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