Ionic colloidal crystals: Ordered, multicomponent structures via controlled heterocoagulation

Maskaly, Garry R.; Garcı́a, R. Edwin; Carter, W. Craig; Chiang, Yet‐Ming

doi:10.1103/physreve.73.011402

Cited by 28 publications

(13 citation statements)

References 33 publications

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“…Conventional processes for ordering colloids, which employ repulsive forces between particles that carry electrostatic charges of the same sign, produce close-packed crystalline analogs. Using a composite suspension of two particle types, each monodisperse with a different size and with opposing charge, provides a method to create colloidal crystals of lower symmetry [9][10][11][12][13], and therefore may produce stable structures with novel photonic, sensing, and filtering properties. However, processing methods that produce lower symmetry structures prove to be more difficult to realize, primarily because the colloidal composite's attractive coulombic and van der Waal's forces limits the length scale of ordering.…”

Section: Introductionmentioning

confidence: 99%

Controlled and rapid ordering of oppositely charged colloidal particles

Sharma

Yan

Wong

et al. 2009

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Controlled and rapid ordering of oppositely charged colloidal particles

Sharma

Yan

Wong

et al. 2009

Journal of Colloid and Interface Science

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“…The scalability of this technique would allow the preparation of colloids in amounts sufficient for studying their interactions in water and their packing to create original materials. [40][41][42] …”

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confidence: 99%

A Chemical Synthetic Route towards “Colloidal Molecules”

Perro¹,

Duguet²,

Lambert³

et al. 2008

Angew Chem Int Ed

123

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A non-exhaustive list of fields in which extensive research has been dedicated to colloidal particles during the past century includes condensed matter physics, biology, optics, materials science, and chemistry. Both our current understanding of various physical phenomena and our capability to fabricate new functional materials have been considerably enriched by the development of synthetic strategies that are capable of generating copious quantities of colloidal entities of good size uniformity. Nevertheless, most of the available monodisperse colloidal materials are spherical, as the minimization of the interfacial free energy strongly drives a particle to adopt such a shape.[1] This strongly limits the number of new structures which can be engineered by using these colloids as building blocks. For instance, the crystallization of spherical colloids into three-dimensional periodic lattices has recently allowed the emergence of a very active field of research-photonic colloidal crystals, known as artificial opals. Nevertheless, the light diffraction properties of these crystals are rather limited because of their face-centered cubic lattice, which results from the packing of spheres. It has been predicted that crystals with a lower degree of symmetry, such as the diamond lattice, can exhibit a full photonic bandgap. To build such photonic crystals, well-defined colloids with nonspherical shapes are required. Van Blaaderen recently introduced the elegant term of "colloidal molecules", [2] which takes into account that spherical colloids can be treated as if they were atoms and that molecules can form more complex materials than can atoms. Therefore, the reproducible fabrication of large amounts of colloids that have a good uniformity in chemical composition, surface properties, size, and shape is a huge challenge.[3] Intensive efforts during the last decade have led to the development of nonspherical colloids of various shapes (such as rods, [4][5][6] wires, [7] triangles, [8] prisms, [9] cubes, [10] ellipsoids, [11] octahedra, [12] tetrapods, [13] ), but few of these samples combined the requirements of a true monodispersity in size and shape and the production of sufficiently large quantities. A promising synthetic procedure involves the use of a physical template to better control these two parameters. Micropatterned charged monolayers [14][15][16][17] or relief structures [18][19][20][21][22][23] on two-dimensional substrates were used to fabricate mono or binary clusters of colloids with high-arrangement accuracies, but in very small quantities. Three-dimensional templates such as liquid [24] or emulsion droplets [25,26] were also exploited to form complex colloidal assemblies with well-controlled sizes and morphologies. For example, a clever approach based on the generation of oil-in-water emulsions containing polymer microspheres and the subsequent controlled oil evaporation was first developed by Manoharan et al., [27][28][29] and led to aggregates that contain a precise number of polymer microspheres. Th...

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“…1D is a partially phaseseparated colloid trapped in a metastable state, and should form structures analogous to phase-separated materials (16). This form of colloidal ordering may be viewed as the inverse of "ionic colloidal crystals" in which electrostatic attraction between oppositelycharged particles results in ordered structures analogous to ionic crystals (17). We note also an earlier example of mesoscale self-assembly using simultaneous attractive and repulsive (hydrophobic and hydrophilic) surfaces (18), there applied to anisometric "tiles" of a single material to create a range of self-assembled structures.…”

Section: Development Of a Colloidal-scale Self-organizing Lithium Recmentioning

confidence: 99%

Self-Organizing Batteries

Chiang¹

2005

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Pubic reporting burden for this collection of infonretion is estimated to average 1 hour per response, including the time for reviewing instroctions, se reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including sugj lormation Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and AUTHOR(S)Chiang, Yet-Ming This research aimed to use colloidal self-organization to create complete bipolar electrochemical devices. In this approach, repulsive and attractive surface forces are introduced within device structures to form: 1) nanoscale electrochemical junctions between electronically conductive anodes and cathodes; 2) electronically conductive networks of storage materials particles; and 3) electrical connections to the external circuit via selective attachment of particles to current collectors. Rechargeable lithium batteries were used as a testbed device for this approach. In particular, efforts were aimed at enabling a self-organized architecture (Figure 1) in which a continuously percolating cathode network is "wired" to one current collector and an anode network to the other, while the two networks are isolated everywhere from one another by repulsive surface forces. Repulsive dispersion forces (negative Hamaker constant) and other surface forces were used to create permanent electrochemical junctions that upon drying or solidification of the liquid medium are filled by solid polymer electrolyte, resulting in solid-state devices. Such batteries could be economically fabricated at sizes and shapes ranging from printed microbatteries to large-scale continuous coatings, and would have increased energy and power densities due to improved packing and reduced transport distances. This work represents a fundamentally new approach to electrochemical device fabrication, ultimately applicable to a broad range of DoD technologies. Material 3: anode storage compound % electron flow 4 Figure 1. Colloidal self-assembly aims to replace the conventional laminated battery design with an interpenetrating electrode design. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)8Accomplishments:There were two main areas of accomplishment under this program. The first was the development of new understanding, and identification of key materials and selection criteria, for electronically conductive device materials having repulsive van der Waals 2 forces enabling junction formation. The second was the application of these principles to a lithium ion battery, resulting in the demonstration of the first self-organized rechargeable battery. These accomplishments are described separately below. Short-Ranze Repulsive Forces between Conductive Device MaterialsIn this part of the project, our goals were the following:"Identification of negative Hamaker constant materials systems for self-organization. From theory and experiment, indium tin oxide (ITO) has been identified as one of a group of "low-index," electronical...

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Ionic colloidal crystals: Ordered, multicomponent structures via controlled heterocoagulation

Cited by 28 publications

References 33 publications

Controlled and rapid ordering of oppositely charged colloidal particles

Controlled and rapid ordering of oppositely charged colloidal particles

A Chemical Synthetic Route towards “Colloidal Molecules”

Self-Organizing Batteries

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