4.8 Article

Building Reversible Nanoraspberries

期刊

NANO LETTERS
卷 21, 期 5, 页码 2232-2239

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c05059

关键词

Supraparticles; Raspberry Nanoparticles; Self-assembly; Silica Nanoparticles; CryoTEM

资金

  1. EU H2020 Marie Sklodowska-Curie Action project MULTIMAT
  2. 4TU High-Tech Materials research program New Horizons in Designer Materials

向作者/读者索取更多资源

The study investigates the adsorption mechanism of small positively charged silica nanoparticles onto larger polystyrene latex nanoparticles to form hybrid particles. The research identified the optimum conditions for nanoraspberry formation and demonstrated the reversibility and stability of the process. Understanding and controlling the relevant parameters will contribute to better control of nanoraspberry formation and higher-order assemblies.
The adsorption mechanism of small positively charged silica nanoparticles (SiO2 NPs) onto larger polystyrene latex nanoparticles (PSL NPs) forming hybrid particles was studied. CryoTEM showed the morphology of these supraparticles to be raspberry-like. After surface modification of the SiO2 NPs, the optimum pH regime to initiate the formation of nanoraspberries was determined. Thereafter, their size evolution was evaluated by dynamic light scattering for different surface charge densities. Reversibility of nanoraspberry formation was shown by cycling the pH of the mixture to make interparticle forces either attractive or repulsive, while their stability was confirmed experimentally. The number of SiO2 NPs on the PSL NPs as determined with cryoTEM matched the theoretically expected maximum number. Understanding and controlling the relevant parameters, such as size and charge of the individual particles and the Debye length, will pave the way to better control of the formation of nanoraspberries and higher-order assemblies thereof.

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