Journal
CHEMISTRY OF MATERIALS
Volume 33, Issue 21, Pages 8460-8468Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c02887
Keywords
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Funding
- National Natural Science Foundation of China [21673117, 91956109]
- Jiangsu Provincial Foundation for Specially-Appointed Professor, start-up fund at Nanjing Tech University [39837102, 39837140]
- SICAM Fellowship from Jiangsu National Synergetic Innovation Center for Advanced Materials
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By introducing salt solutions, Janus nanostructures can be obtained, and the high concentration of salt solutions affects the interactions of materials, thereby affecting the formation and wetting effect of nanostructures.
While the reverse emulsion methods traditionally only give core-shell nanostructures, we show that Janus nanostructures could be readily obtained by introducing salt solutions. Given the isolated pockets of reverse emulsion, the salt solutions could reach extreme concentrations, up to 700 times higher than what is possible via the Stober method. Both the increasing amount of the doped cations in the silica and the decreasing cationic radius would enhance the interactions with the negatively charged silica precursor, resulting in poorer wetting of the silica domain on the Fe3O4 nanoparticles. In other words, with increasing strength of the internal interactions, the growth domain would have a higher tendency to curl up and reduce its unfavorable interfaces, leading to poorer wetting. The tuning of the solid-solid wetting is of great significance for the design and synthesis of Janus nanoparticles, in particular their precise structural modulation. We believe that our new means of structural modulation beyond the interface itself would open new synthetic routes at the nanoscale.
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