Artificial opals prepared by melt compression

Ruhl, Tilmann; Spahn, Peter; Hellmann, G. P.

doi:10.1016/j.polymer.2003.09.047

Cited by 125 publications

(149 citation statements)

References 44 publications

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“…(E, F) Melt extrusion of core-shell particles can fabricate elastomeric, mechanically stable opals over large areas. 135,136,160 Reproduced with permission from John Wiley and Sons, Elsevier, and the American Chemical Society. (G, H) Droplet-based microfluidics can be used to prepare spherical superparticles in a continuous-flow method 105 (reproduced with permission from the National Academy of Sciences), and (H) the throughput can be increased by parallelization while maintaining monodispersity 161 (reproduced with permission from the Royal Society of Chemistry).…”

Section: (D) Multiple Porositiesmentioning

confidence: 99%

“…The shear forces induce ordering of the particles and upon cooling, a large area colloidal crystal results ( Figure 5E). 135,136 The shell can further be crosslinked, producing elastomeric colloidal crystals with strain-responsive structural color ( Figure 5F). 160 Finally, superparticles can be prepared in a microfluidic setup, allowing a continuous flow production of self-assembled materials with high fidelity (Figure 5G-H).…”

Section: (D) Multiple Porositiesmentioning

confidence: 99%

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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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Section: (D) Multiple Porositiesmentioning

confidence: 99%

Section: (D) Multiple Porositiesmentioning

confidence: 99%

A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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“…: a The flowing melt crystallizes along the plates of the press under uniaxial compression. [17] b Melt compressed polymer opal film with PS core and PEA shell. [67] in principle it would be possible to upscale the method, it would be unpractical and slow to produce much larger and thicker samples by that.…”

Section: Melt Compressionmentioning

confidence: 99%

“…At DKI the mass is shaped into a cylindrical sample, which is uniaxially compressed at 170 • C in a Collin 300 press, with an initial pressure of 1 bar and a final pressure of 50 bar. [17] In the beginning of the pressing process, the first crystalline layers appear on the plates of the press. As shown in Fig.…”

Section: Melt Compressionmentioning

confidence: 99%

“…In Fig.3.1 several techniques to achieve colloidal crystals will be presented, including sedimentation, [13] electrodeposition, [14] centrifugation, filtering, vertical deposition, [15,16] and compression molding. [17] Especially the last two techniques play a role in this thesis and will be introduced in more detail in the sections 3.1 and 3.2.…”

Section: Introductionmentioning

confidence: 99%

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High Frequency Acoustics in Colloid-Based Meso- and Nanostructures by Spontaneous Brillouin Light Scattering

Still

2010

Springer Theses

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Complex 3D‐Printed Mechanochromic Materials with Iridescent Structural Colors Based on Core–Shell Particles

Siegwardt

Gallei

2023

Adv Funct Materials

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A scalable protocol for design and subsequent 3D‐printing of polymeric core‐shell‐particles is reported. The particle synthesis by emulsion polymerization in starved‐feed mode is used for tailoring particle architecture and composition. Control of size, mechanical properties, and chemical functionalities allow to achieve the specific requirement profile for subsequent extrusion‐based additive manufacturing. The core‐shell particles consist of hard polystyrene cores and a comparably soft polyalkylacrylate‐based shell. Size and monodispersity, as well as core‐to‐shell ratio, are determined by means of dynamic light scattering and transmission electron microscopy. Thermal and rheological properties are investigated by means of dynamic scanning calorimetry and thermogravimetric analysis as well as oscillation and capillary rheometry. During 3D‐printing, the monodisperse particles self‐assemble into an ordered close packed lattice structure, leading to visible reflection colors according to Bragg's law of diffraction. Distinct and angle‐dependent reflection colors are recorded via UV‐vis spectroscopy. As the structural color depends, inter alia, on the underlying particle sizes, resulting colors are easily tunable by adjusting the applied synthesis parameters. Under mechanical deformation, the color changes due to controlled lattice deformation, which enables mechanochromic sensing with the printed objects. They are also promising candidates for decorative ornaments, smart optical coatings, or advanced security devices.

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Artificial opals prepared by melt compression

Cited by 125 publications

References 44 publications

A colloidoscope of colloid-based porous materials and their uses

A colloidoscope of colloid-based porous materials and their uses

High Frequency Acoustics in Colloid-Based Meso- and Nanostructures by Spontaneous Brillouin Light Scattering

Complex 3D‐Printed Mechanochromic Materials with Iridescent Structural Colors Based on Core–Shell Particles

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