NYU Chemistry Professor Stefano Sacanna led a study using electrostatic charge to assemble particles into materials mimicking gemstones and salt crystals. The process offers a simple and scalable approach to particle self-assembly. Researchers include first author Ted Hueckel (graduate student, and currently a postdoc, in the Sacanna Lab), NYU Assistant Professor Glen Hocky and UCSD colleague Jeremie Palacci.
Read the article, "Ionic Solids from Common Colloids," in Nature.
Read the NYU Research Spotlight press release.
Abstract: From rock salt to nanoparticle superlattices, complex structure can emerge from simple building blocks that attract each other through Coulombic forces1,2,3,4. On the micrometre scale, however, colloids in water defy the intuitively simple idea of forming crystals from oppositely charged partners, instead forming non-equilibrium structures such as clusters and gels5,6,7. Although various systems have been engineered to grow binary crystals8,9,10,11, native surface charge in aqueous conditions has not been used to assemble crystalline materials. Here we form ionic colloidal crystals in water through an approach that we refer to as polymer-attenuated Coulombic self-assembly. The key to crystallization is the use of a neutral polymer to keep particles separated by well defined distances, allowing us to tune the attractive overlap of electrical double layers, directing particles to disperse, crystallize or become permanently fixed on demand. The nucleation and growth of macroscopic single crystals is demonstrated by using the Debye screening length to fine-tune assembly. Using a variety of colloidal particles and commercial polymers, ionic colloidal crystals isostructural to caesium chloride, sodium chloride, aluminium diboride and K4C60 are selected according to particle size ratios. Once fixed by simply diluting out solution salts, crystals are pulled out of the water for further manipulation, demonstrating an accurate translation from solution-phase assembly to dried solid structures. In contrast to other assembly approaches, in which particles must be carefully engineered to encode binding information12,13,14,15,16,17,18, polymer-attenuated Coulombic self-assembly enables conventional colloids to be used as model colloidal ions, primed for crystallization.
This research was supported by the National Science Foundation (a CAREER Award, the Materials Research Science and Engineering Center, MRI Program, and other grants) and the Sloan Foundation.