Van der Waals Colloidal Crystals

Authors
Cho, YongDeokPark, Sung HunKwon, MinKim, Hyeon HoHuh, Ji-HyeokLee, Seungwoo
Issue Date
2024-06
Publisher
WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Citation
Advanced Materials, v.36, no.23
Abstract
A general guiding principle for colloidal crystallization is to tame the attractive enthalpy such that it slightly overwhelms the repulsive interaction. As-synthesized colloids are generally designed to retain a strong repulsive potential for the high stability of suspensions, encoding appropriate attractive potentials into colloids has been key to their crystallization. Despite the myriad of interparticle attractions for colloidal crystallization, the van der Waals (vdW) force remains unexplored. Here, it is shown that the implementation of gold cores into silica colloids and the resulting vdW force can reconfigure the pair potential well depth to the optimal range between -1 and -4 k(B)T at tens of nanometer-scale colloidal distances. As such, colloidal crystals with a distinct liquid gap can be formed, which is evidenced by photonic bandgap-based diffractive colorization.
Keywords
NANOPARTICLE SUPERLATTICES; PHOTONIC STRUCTURES; OPTICAL-PROPERTIES; CLUSTERS; COLOR; colloids; gold nanoparticles; pair potentials; photonic crystals; van der Waals forces
ISSN
0935-9648
URI
https://pubs.kist.re.kr/handle/201004/149542
DOI
10.1002/adma.202312748
Appears in Collections:
KIST Article > 2024
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