Reversible Morphology Switching of Colloidal Particles

Liu, Mingzhu; Zheng, Xiaolong; Dong, Fangyuan; Ward, Michael D.; Weck, Marcus

doi:10.1021/acs.chemmater.8b03227

Cited by 16 publications

(15 citation statements)

References 35 publications

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“…A wide variety of post‐treatment techniques, including solvent‐absorbing/releasing, [ 109,110 ] general solvent evaporation, [ 111–121 ] microfluidic emulsification/emulsion–solvent evaporation, [ 122–128 ] electrospraying/solvent evaporation, [ 129–137 ] electrospinning/solvent evaporation, [ 138,139 ] templating method, [ 140–166 ] treatment on core–shell particles [ 167–173 ] and self‐assembly of polymer [ 174–176 ] have been developed for dimpled polymer particles syntheses.…”

Section: Dimpled Polymer Particlesmentioning

confidence: 99%

Synthetic Strategies for Polymer Particles with Surface Concavities

Zou

2022

Macromol. Rapid Commun.

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Over the past decade or so, there has been increasing interest in the synthesis of polymer particles with surface concavities, which mainly include golf ball‐like, dimpled and surface‐wrinkled polymer particles. Such syntheses generally can be classified into direct polymerization and post‐treatment on preformed polymer particles. This review aims to provide an overview of the synthetic strategies of such particles. Some selected examples are given to present the formation mechanisms of the surface concavities. The applications and future development of these concave polymer particles are also briefly discussed.

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Section: Dimpled Polymer Particlesmentioning

confidence: 99%

Synthetic Strategies for Polymer Particles with Surface Concavities

Zou

2022

Macromol. Rapid Commun.

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“…A reversible transition was observed in the colloidal system prepared by Liu et al in which non-crosslinked PS microspheres were dispersed in a thermoresponsive mixture comprising water and 2,6-dimethylpyridine (DMP) (Figure 2e). [72] When heated above the phase separation temperature, DMP was absorbed by the particle surfaces, resulting in shapes that were determined by the relative magnitudes of the interfacial tensions (i.e., between PS and water, DMP and water, and PS and DMP). As the interfacial tension depended on temperature and surfactant concentration, changes in these parameters resulted in reversible switching between different morphologies.…”

Section: Manipulation Of Wetting and Surface Anchoring For Irreversible And Reversible Shape Changementioning

confidence: 99%

Shape‐Changing Particles: From Materials Design and Mechanisms to Implementation

et al. 2021

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emerging fabrication and synthesis techniques have recently enabled their extension to micro and nanoscale objects. Miniaturization of shape-changing structures allows for their integration into new application areas. As soft actuators are being developed at the micrometer scale, their applications are being realized in biomedical science such as in minimally invasive biopsies, [10,11] targeted drug and cell delivery, [12][13][14] and responsive microfluidics. [15] Since the size of shape-changing structures are approaching the wavelength of visible light, novel approaches to modulate light-matter interactions are being explored with applications in tunable photonics. [16][17][18] Small-scale shapechanging architectures are now being considered as smart building blocks of materials that can be assembled and reconfigured on demand. [19,20] In this review, we discuss mechanisms that facilitate shape changes in micro-and nanostructures as well as their usefulness in several emerging applications. We refer to these structures as "shape-changing particles." We examine a variety of shape-transformations, except the simple case of isotropic volume-change. In Section 2, we review numerous mechanisms that have been recently exploited to change the shape of particles in response to stimuli such as temperature, pH, light, and magnetic fields. We discuss the properties of commonly used materials, including liquid crystal elastomers, [21] responsive hydrogels, [22] and shape-memory polymers [23] as well as techniques for fabricating particles from these materials. We highlight various types of shape transformations such as changing the aspect ratio of microand nanoscale anisotropic particles, [24] bending of microcylinders and particle chains, [25,26] twisting of microribbons, [27] and folding of microscale sheets. [28] Finally, we discuss the challenges and opportunities for programmable shape-morphing and the kinetics of shape change that are controlled by particle size and the mode of stimulation. In Section 3, we review recent applications of shape-changing particles, including photonics, microfluidics, microrobotics, drug delivery, and surgery. In each of these categories, we discuss seminal advances that have been enabled by shape-changing particles, and we discuss their benefits compared to conventional approaches. In Section 4, we identify key unresolved challenges in current applications and areas of research that hold promise for advancing the current state of knowledge of dynamic materials design. Demands for next-generation soft and responsive materials have sparked recent interest in the development of shape-changing particles and particle assemblies. Over the last two decades, a variety of mechanisms that drive shape change have been explored and integrated into particulate systems. Through a combination of top-down fabrication and bottom-up synthesis techniques, shape-morphing capabilities extend from the microscale to the nanoscale. Consequently, shape-morphing particles are rapidly emerging in a variety of co...

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“…A further increase of the agitation time to 30 min (entry 13 in Table 1) also led to similar morphologies, indicating that 20 s was enough for the deformation process if the THF concentration was high enough. 51…”

Section: Variation Of the Deformation Parameters For The Melting Of Rmentioning

confidence: 99%