A Facile Synthesis of Dynamic, Shape‐Changing Polymer Particles

Klinger, Daniel; Wang, Cynthia X.; Connal, Luke A.; Audus, Debra J.; Jang, Se Gyu; Kräemer, Stephan; Killops, Kato L.; Fredrickson, Glenn H.; Krämer, Edward J.; Hawker, Craig J.

doi:10.1002/anie.201400183

Cited by 208 publications

(279 citation statements)

References 49 publications

(24 reference statements)

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“…Hawker et al have studied the shape changing of PSb-P2VP pupa-like particles triggered by pH alteration. 10 In our case, the P2VP phase was slightly cross-linked by DIB (5 mol % of 2VP unit) and then dispersed in HCl aqueous solution at pH 3. As shown in Figure 9a,b, the pupa-like particles stretch along the major axis.…”

Section: Effect Of Solvent Property On Particlementioning

confidence: 99%

Additives Induced Structural Transformation of ABC Triblock Copolymer Particles

Yang

Wang

et al. 2015

Langmuir

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Here we report the structural control of polystyrene-b-polyisoprene-b-poly(2-vinylpyridine) (PS-b-PI-b-P2VP) asymmetric ABC triblock copolymer particles under 3D confinement by tuning the interactions among blocks. The additives, including 3-n-pentadecylphenol, homopolystyrene, and solvents, which can modulate the interactions among polymer blocks, play significant roles in the particle morphology. Moreover, the structured particles can be disassembled into isolated micellar aggregates with novel morphologies or mesoporous particles with tunable pore shape. Interestingly, the formed pupa-like PS-b-PI-b-P2VP particles display interesting dynamic stretch-retraction behavior when the solvent property is changed after partial cross-linking of the P2VP block. We further prove that such dynamic behavior is closely related to the density of cross-linking. The strategies presented here are believed to be promising routes to rationally design and fabricate block copolymer particles with desirable shape and internal structure.

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Section: Effect Of Solvent Property On Particlementioning

confidence: 99%

Additives Induced Structural Transformation of ABC Triblock Copolymer Particles

Yang

Wang

et al. 2015

Langmuir

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“…32,33 The composition can later be tailored as desired, as discussed below and described in Figure 2. With the focus on the assembly of simple, spherical particles, this review does not cover the synthesis and self-assembly of more complex colloidal building blocks, such as Janus particles, 34,35 patchy particles, [36][37][38][39] core-shell particles, [40][41][42] particles with more complex internal structures, [43][44][45] anisotropic particles, 46 or non-spherical nanocrystals. [47][48][49][50] Complex properties and highly functional materials can emerge solely by controlling the structure of the material or by providing a template to generate patterns in another material.…”

Section: Fabrication Of Colloidal Assembliesmentioning

confidence: 99%

A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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Nature evolved a variety of hierarchical structures that produce sophisticated functions. Inspired by these natural materials, colloidal self-assembly provides a convenient way to produce structures from simple building blocks with a variety of complex functions beyond those found in nature. In particular, colloid-based porous materials (CBPM) can be made from a wide variety of materials. The internal structure of CBPM also has several key attributes, namely porosity on a sub-micrometer length scale, interconnectivity of these pores, and a controllable degree of order. The combination of structure and composition allow CBPM to attain properties important for modern applications such as photonic inks, colorimetric sensors, self-cleaning surfaces, water purification systems, or batteries. This review summarizes recent developments in the field of CBPM, including principles for their design, fabrication, and applications, with a particular focus on structural features and materials' properties that enable these applications. We begin with a short introduction to the wide variety of patterns that can be generated by colloidal self-assembly and templating processes. We then discuss different applications of such structures, focusing on optics, wetting, sensing, catalysis, and electrodes. Different fields of applications require different properties, yet the modularity of the assembly process of CBPM provides a high degree of tunability and tailorability in composition and structure. We examine the significance of properties such as structure, composition, and degree of order on the materials' functions and use, as well as trends in and future directions for the development of CBPM.

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“…8,10 Recently, ellipsoid-and convex lens-shaped BCP particles were fabricated using a mixture of surfactants that had selective interaction with each block of the BCP domains at the particle surfaces. 8,[11][12][13][14] Due to their well-defined shape and internal nanostructure, these particles potentially will be useful as optical lens, 13 sensors, 15,16 high performance electrodes 17 and catalysts, 18 and dielectric resonators. 19 For implementing the particles into the practical applications mentioned above, it is necessary and essential to be able to produce monodispersed micron-or submicron-sized BCP particles on large production scale because their properties depend decisively on particle size.…”

Section: Introductionmentioning

confidence: 99%

Monodipserse Nanostructured Spheres of Block Copolymers and Nanoparticles via Cross-Flow Membrane Emulsification

et al. 2015

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Monodispersed colloidal particles of polystyrene-b-polybutadiene (PS-b-PB) block copolymers (BCPs) were successfully prepared, in which uniform emulsion containing BCPs were firstly generated by cross-flow membrane emulsification using tubular Shirasu porous glass (SPG) membrane and then unique internal nanostructures were developed by controlled evaporation of emulsions. The diameter of those BCP particles could be controlled from 200 nm to 5 µm by tuning the pore diameter of the membrane. With symmetric BCPs, onion-like nanostructures inside particles were formed by slow evaporation of emulsion. Coiled-cylinders in the BCP particles were also developed by adding homopolymers, in which the assembled BCP structure is strongly dependent on the particle size, demonstrating the importance of our membrane method in generating monodispersed BCP particles. Further investigation of process parameters showed that for a given pore diameter, the operation pressure (P) and surfactant concentration were critical parameters for narrow size distribution of the particles. When the ratio of the operation pressure to the critical pressure (P/P c ) was less than 4.33, uniform emulsions were produced with a sufficient amount of sodium dodecyl sulfate surfactants in the continuous phase. In addition, uniformly-sized, hierarchically structured particles of BCPs and nanoparticles (NPs) were produced, in which oleylamine coated, 3-nm sized Au NPs were incorporated selectively into the PB domains inside the particles.

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A Facile Synthesis of Dynamic, Shape‐Changing Polymer Particles

Cited by 208 publications

References 49 publications

Additives Induced Structural Transformation of ABC Triblock Copolymer Particles

Additives Induced Structural Transformation of ABC Triblock Copolymer Particles

A colloidoscope of colloid-based porous materials and their uses

Monodipserse Nanostructured Spheres of Block Copolymers and Nanoparticles via Cross-Flow Membrane Emulsification

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