Long-Ranged Oppositely Charged Interactions for Designing New Types of Colloidal Clusters

Getting control over the valency of colloids is not trivial and has been a long-desired goal for the colloidal domain. Typically, tuning the preferred number of neighbors for colloidal particles requires directional bonding, as in the case of patchy particles, which is difficult to realize experimen...

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Bibliographic Details
Published in:Physical review. X 2015-04, Vol.5 (2), p.021012, Article 021012
Main Authors: Demirörs, Ahmet Faik, Stiefelhagen, Johan C. P., Vissers, Teun, Smallenburg, Frank, Dijkstra, Marjolein, Imhof, Arnout, van Blaaderen, Alfons
Format: Article
Language:English
Subjects:
Analogs
Charge reversal
Charged particles
Clusters
Colloids
Dimers
Domains
Electric contacts
Electric fields
Ion concentration
Metamaterials
Permittivity
Small satellites
Tuning
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Summary:Getting control over the valency of colloids is not trivial and has been a long-desired goal for the colloidal domain. Typically, tuning the preferred number of neighbors for colloidal particles requires directional bonding, as in the case of patchy particles, which is difficult to realize experimentally. Here, we demonstrate a general method for creating the colloidal analogs of molecules and other new regular colloidal clusters without using patchiness or complex bonding schemes (e.g., DNA coating) by using a combination of long-ranged attractive and repulsive interactions between oppositely charged particles that also enable regular clusters of particles not all in close contact. We show that, due to the interplay between their attractions and repulsions, oppositely charged particles dispersed in an intermediate dielectric constant (4
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.5.021012