Site-Specific Functionalization on Individual Colloids:  Size Control, Stability, and Multilayers

Yake, Allison M.; Snyder, Charles E.; Velegol, Darrell

doi:10.1021/la7011292

Cited by 71 publications

(81 citation statements)

References 31 publications

(52 reference statements)

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“…Besides the one-patch model particles presented here, a wide variety of synthetic routes for colloids with more complex patterns of rough and smooth surfaces is readily available in literature (28,(34)(35)(36)(37)(38)(39)(40). In particular, we emphasize that size, number and even the angle between patches can be controlled (38)(39)(40).…”

Section: Resultsmentioning

confidence: 99%

Surface roughness directed self-assembly of patchy particles into colloidal micelles

Kraft

Smallenburg

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

332

314

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Colloidal particles with site-specific directional interactions, so called "patchy particles", are promising candidates for bottomup assembly routes towards complex structures with rationally designed properties. Here we present an experimental realization of patchy colloidal particles based on material independent depletion interaction and surface roughness. Curved, smooth patches on rough colloids are shown to be exclusively attractive due to their different overlap volumes. We discuss in detail the case of colloids with one patch that serves as a model for molecular surfactants both with respect to their geometry and their interactions. These one-patch particles assemble into clusters that resemble surfactant micelles with the smooth and attractive sides of the colloids located at the interior. We term these clusters "colloidal micelles". Direct Monte Carlo simulations starting from a homogeneous state give rise to cluster size distributions that are in good agreement with those found in experiments. Important differences with surfactant micelles originate from the colloidal character of our model system and are investigated by simulations and addressed theoretically. Our new "patchy" model system opens up the possibility for self-assembly studies into finite-sized superstructures as well as crystals with as of yet inaccessible structures.anisotropic colloids | depletion interactions | Monte-Carlo simulations N ature has mastered the self-assembly of simple basic subunits into complex, functional structures with outstanding precision. Examples include biological membranes and viruses, which exhibit excellent control over the assembled structures with respect to their functionalities, shapes or sizes. However, the interactions between the building blocks, in the case of viruses, the protein subunits, are often complex and it remains challenging to identify the key elements for guiding and controlling the selfassembling process. By mimicking such self-assembly processes on a colloidal scale, insights into the paramount elements that control the assembly can be obtained in situ and applied to build up superstructures with new and desirable properties.Colloidal particles with site-specific directional interactions, so called "patchy particles", are promising candidates for bottom-up assembly routes towards such complex structures with rationally designed properties (1-3). The size and geometry of the patches together with the shape of the interparticle potential are expected to determine the formed structures and phases, which may range from empty liquids (4) and crystals (5-7) to finite-sized clusters (1, 2, 8-11), and lead to novel collective behavior (12).Recent experimental approaches to assemble colloidal particles at specific sites include hydrophobic-hydrophilic interactions (6,7,(13)(14)(15), and lock-and-key recognition mechanisms (16). With a wide variability of colloidal shapes available today, the ultimate challenge is to identify general methods to render specific areas of the colloids attractive or ...

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Section: Resultsmentioning

confidence: 99%

Surface roughness directed self-assembly of patchy particles into colloidal micelles

Kraft

Smallenburg

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

332

314

View full text Add to dashboard Cite

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“…[10,11,70] Next, we will introduce evaporation-driven colloidal assembly, as pioneered by Manoharan et al (Figure 5b), [12,68] and particle lithography, as invented by Snyder et al (Figure 5c). [9,16] The commonality between these three techniques is that fabrication/assembly occurs Adapted with permission from ref. [27] Copyright 2007, Nature Publishing Group.…”

Section: Patchy Particle Fabrication Techniquesmentioning

confidence: 99%

“…[90] Figure 5c shows a schematic of the technique. [9] Since particle lithography is a LPD-based technique, a mask is needed to produce sitespecific functionalization. The essence of the method is that a charged particle adheres to an oppositely charged surface.…”

Section: Particle Lithographymentioning

confidence: 99%

“…The first layer is made up of 10 nm sulfate polystyrene (PS) particles, followed by a layer of poly(allylamine hydrochloride) (PAH) adsorbed onto them, followed by adsorption of a second layer of 84 nm sulfate latex PS particles onto the PAH layer. [9] In a recent publication, [1] this method was used to assemble colloidal water molecules in aqueous solution.…”

Section: Particle Lithographymentioning

confidence: 99%

“…A wide variety of anisotropic particles with diverse anisotropy in size, shape [1][2][3][4][5][6][7] and chemical functionality [8][9][10][11][12][13][14][15][16][17][18][19][20] has been explored. Within such a large diversity of anisotropic particles, significant attention has been given lately to the study of surface-anisotropic particles, that is, particles exhibiting multiple surface functionalities, while often having an isotropic polymer core.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication, Assembly, and Application of Patchy Particles

Pawar

Kretzschmar

2010

Macromol. Rapid Commun.

452

411

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The site‐specific engineering of colloidal surfaces has provided a powerful approach to pushing the boundaries of today's materials research. The resulting surface‐anisotropic and patchy particles have become the center of vital research areas, ranging from the need for large‐scale fabrication techniques to exploring new applications of these materials. This Review summarizes patchy particle fabrication techniques, including but not limited to particle and nanosphere lithography and glancing‐angle deposition. The variety of existing patchy particle fabrication techniques is revealed and the need for a scalable approach to high‐volume patchy particle production is identified. Ongoing modeling efforts describing patchy particle interactions and properties are reviewed as potential predictive tools. Research endeavors that deal with the directed assembly of patchy particles in electric and magnetic fields, as well as with supraparticular assembly through chemical interactions, are discussed. The Review is concluded with a note on the future application of patchy particles as phoretic motors.magnified image

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Preparation of Janus Titanium Dioxide Particles via Ultraviolet Irradiation of Pickering Emulsions

Tan

Wong

Chen

2020

Adv Materials Inter

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Pickering emulsions are stabilized by solid particles assembled at an immiscible liquid–liquid interface. In this work, the use of such emulsions to prepare semiconductor Janus particles through UV‐irradiation is explored. Titanium dioxide particles that are prefunctionalized with an alkylsilane or a fluoroalkylsilane are employed to obtain wax‐in‐water emulsion droplets, which consist of the particles partially embedded in the wax core. Different emulsion formation mechanisms are discussed. The emulsified wax droplets are then subjected to ultraviolet irradiation, which photocatalytically degrades the silanes on the exposed portion of the particle surfaces, leading to Janus particles containing partial silane coatings. The particles are finally recovered through dissolution of wax. The Janus particles, which have contrasting wettabilities over their surface, are characterized based on self‐assembly behavior and bulk wetting performance in a compact film, as compared with nonfunctionalized and fully‐functionalized homogeneous particles. Three different types of Janus particles are created and their characters are explained using the concept of the Janus balance. The method has the potential to produce large scale yields in a relatively short time, and can be potentially applied to other semiconductor particles for the generation of Janus particles.

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Site-Specific Functionalization on Individual Colloids: Size Control, Stability, and Multilayers

Cited by 71 publications

References 31 publications

Surface roughness directed self-assembly of patchy particles into colloidal micelles

Surface roughness directed self-assembly of patchy particles into colloidal micelles

Fabrication, Assembly, and Application of Patchy Particles

Preparation of Janus Titanium Dioxide Particles via Ultraviolet Irradiation of Pickering Emulsions

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