Marcel Rey
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View article: Microscopic geared metamachines
Microscopic geared metamachines Open
The miniaturization of mechanical machines is critical for advancing nanotechnology and reducing device footprints. Traditional efforts to downsize gears and micromotors have faced limitations at around 0.1 mm for over thirty years due to …
View article: Self-assembly of defined core–shell ellipsoidal particles at liquid interfaces
Self-assembly of defined core–shell ellipsoidal particles at liquid interfaces Open
Pure ellipsoidal particles without a shell consistently form side-to-side "chain-like" assemblies, regardless of aspect ratio. In contrast, core-shell ellipsoidal particles exhibit a transition from tip-to-tip "flower-like" arrangements to…
View article: Microscopic Geared Mechanisms
Microscopic Geared Mechanisms Open
The miniaturization of mechanical machines is critical for advancing nanotechnology and reducing device footprints. Traditional efforts to downsize gears and micromotors have faced limitations at around 0.1 mm for over thirty years due to …
View article: Programmable self-assembly of core-shell ellipsoids at liquid interfaces
Programmable self-assembly of core-shell ellipsoids at liquid interfaces Open
Ellipsoidal particles confined at liquid interfaces exhibit complex self-assembly behaviour due to quadrupolar capillary interactions induced by meniscus deformation. These interactions cause particles to attract each other in either tip-t…
View article: Light, Matter, Action: Shining Light on Active Matter
Light, Matter, Action: Shining Light on Active Matter Open
Light carries energy and momentum. It can therefore alter the motion of objects on the atomic to astronomical scales. Being widely available, readily controllable, and broadly biocompatible, light is also an ideal tool to propel microscopi…
View article: Light, Matter, Action: Shining light on active matter
Light, Matter, Action: Shining light on active matter Open
Light carries energy and momentum. It can therefore alter the motion of objects from atomic to astronomical scales. Being widely available, readily controllable and broadly biocompatible, light is also an ideal tool to propel microscopic p…
View article: Contactless interfacial rheology: Probing shear at liquid–liquid interfaces without an interfacial geometry via fluorescence microscopy
Contactless interfacial rheology: Probing shear at liquid–liquid interfaces without an interfacial geometry via fluorescence microscopy Open
Interfacial rheology is important for understanding properties such as Pickering emulsion or foam stability. Currently, the response is measured using a probe directly attached to the interface. This can both disturb the interface and is c…
View article: Continuous, crystalline Sb2S3 ultrathin light absorber coatings in solar cells based on photonic concentric p-i-n heterojunctions
Continuous, crystalline Sb2S3 ultrathin light absorber coatings in solar cells based on photonic concentric p-i-n heterojunctions Open
Many modern types of solar cells that rely exclusively on earth-abundant non-toxic materials include interfaces between a heavier metal chalcogenide and another type of semiconductor. Often, the chemical (adhesion) and physical (charge tra…
View article: Versatile strategy for homogeneous drying patterns of dispersed particles
Versatile strategy for homogeneous drying patterns of dispersed particles Open
After spilling coffee, a tell-tale stain is left by the drying droplet. This universal phenomenon, known as the coffee ring effect, is observed independent of the dispersed material. However, for many technological processes such as coatin…
View article: Interfacial self-assembly of SiO<sub>2</sub>–PNIPAM core–shell particles with varied crosslinking density
Interfacial self-assembly of SiO<sub>2</sub>–PNIPAM core–shell particles with varied crosslinking density Open
The effect of crosslinker content and core size on the interfacial self-assembly of batch-type PNIPAM@SiO 2 core–shell particles was studied, revealing parameter windows for chain phases, rhomboid packing and stable d = 448 nm non-close pa…
View article: Changing the flow profile and resulting drying pattern of dispersion droplets via contact angle modification
Changing the flow profile and resulting drying pattern of dispersion droplets via contact angle modification Open
Spilling tea or coffee leads to a tell-tale circular stain after the droplet dries, known as the "coffee ring effect". The evaporation of suspension droplets is a complex physical process, and predicting and controlling the particle deposi…
View article: Soft Particles at Liquid Interfaces: From Molecular Particle Architecture to Collective Phase Behavior
Soft Particles at Liquid Interfaces: From Molecular Particle Architecture to Collective Phase Behavior Open
Soft particles such as microgels and core-shell particles can undergo significant and anisotropic deformations when adsorbed to a liquid interface. This, in turn, leads to a complex phase behavior upon compression. Here we develop a multis…
View article: Interface-induced hysteretic volume phase transition of microgels: simulation and experiment
Interface-induced hysteretic volume phase transition of microgels: simulation and experiment Open
Thermo-responsive microgel particles can exhibit a drastic volume shrinkage upon increasing the solvent temperature. Recently we found that the spreading of poly(N-isopropylacrylamide)(PNiPAm) microgels at a liquid interface under the infl…
View article: Anisotropic silicon nanowire arrays fabricated by colloidal lithography
Anisotropic silicon nanowire arrays fabricated by colloidal lithography Open
We demonstrate the design of silicon nanowire arrays with tunable elliptical cross-sections. Their anisotropic character of the individual pillars affords defined bending or bundling of the arrays.
View article: Boxes fabricated from plate-stabilized liquid marbles
Boxes fabricated from plate-stabilized liquid marbles Open
Boxes containing functional materials are fabricated from plate-stabilized liquid marbles via the evaporation of the inner liquid.
View article: Collapse-induced phase transitions in binary interfacial microgel monolayers
Collapse-induced phase transitions in binary interfacial microgel monolayers Open
Microgels, consisting of a swollen polymer network, exhibit a more complex self-assembly behavior compared to incompressible colloidal particles, because of their ability to deform at a liquid interface or collapse upon compression.
View article: Interface-induced hysteretic volume phase transition of microgels: simulation and experiment
Interface-induced hysteretic volume phase transition of microgels: simulation and experiment Open
Interface induced hysteresis in the volume phase transition of microgels. Top and side view of microgel configurations.
View article: Spatioselective Deposition of Passivating and Electrocatalytic Layers on Silicon Nanowire Arrays
Spatioselective Deposition of Passivating and Electrocatalytic Layers on Silicon Nanowire Arrays Open
Metal-silicon nanowire array photoelectrodes provide a promising architecture for water-splitting because they can afford high catalyst loading and decouple charge separation from the light absorption process. To further improve and unders…
View article: Effect of Stabilizing Particle Size on the Structure and Properties of Liquid Marbles
Effect of Stabilizing Particle Size on the Structure and Properties of Liquid Marbles Open
A liquid marble (LM) describes a liquid droplet that is wrapped by nonwetting micro- or nanoparticles and therefore obtains characteristics of a solid powder particle. Here, we investigate the effect of the stabilizing particle size on the…
View article: Large-Scale Synthesis of Highly Uniform Silicon Nanowire Arrays Using Metal-Assisted Chemical Etching
Large-Scale Synthesis of Highly Uniform Silicon Nanowire Arrays Using Metal-Assisted Chemical Etching Open
The combination of metal-assisted chemical etching (MACE) with colloidal lithography has emerged as a simple and cost-effective approach to nanostructure silicon. It is especially efficient at synthesizing Si micro- and nanowire arrays usi…
View article: Chiral Materials: Chiral Surface Lattice Resonances (Adv. Mater. 22/2020)
Chiral Materials: Chiral Surface Lattice Resonances (Adv. Mater. 22/2020) Open
Optical activity of surface lattice resonances is demonstrated by Nicolas Vogel and co-workers in article number 2001330. The controlled arrangement of chiral crescent-shaped nanoantennae allows a selective response of the surface lattice …
View article: Chiral Surface Lattice Resonances
Chiral Surface Lattice Resonances Open
Collective excitation of periodic arrays of metallic nanoparticles by coupling localized surface plasmon resonances to grazing diffraction orders leads to surface lattice resonances with narrow line width. These resonances may find numerou…
View article: Morphology-Graded Silicon Nanowire Arrays via Chemical Etching: Engineering Optical Properties at the Nanoscale and Macroscale
Morphology-Graded Silicon Nanowire Arrays via Chemical Etching: Engineering Optical Properties at the Nanoscale and Macroscale Open
We report on a quick, simple, and cost-effective solution-phase approach to prepare centimeter-sized morphology-graded vertically aligned Si nanowire arrays. Gradients in the nanowire diameter and shape are encoded through the macroscale s…
View article: Poly-<i>N</i>-isopropylacrylamide Nanogels and Microgels at Fluid Interfaces
Poly-<i>N</i>-isopropylacrylamide Nanogels and Microgels at Fluid Interfaces Open
The confinement of colloidal particles at liquid interfaces offers many opportunities for materials design. Adsorption is driven by a reduction of the total free energy as the contact area between the two liquids is partially replaced by t…
View article: Pattern formation in two-dimensional hard-core/soft-shell systems with variable soft shell profiles
Pattern formation in two-dimensional hard-core/soft-shell systems with variable soft shell profiles Open
Hard-core/soft-shell particles with experimentally realistic interactions can form honeycombs and quasicrystals.
View article: Stimuli-Responsive Behavior of PNiPAm Microgels under Interfacial Confinement
Stimuli-Responsive Behavior of PNiPAm Microgels under Interfacial Confinement Open
The volume phase transition of microgels is one of the most paradigmatic examples of stimuli-responsiveness, enabling a collapse from a highly swollen microgel state into a densely coiled state by an external stimulus. Although well charac…
View article: Stimuli-responsive behavior of poly(N-isopropylacrylamide) microgels under interfacial confinement
Stimuli-responsive behavior of poly(N-isopropylacrylamide) microgels under interfacial confinement Open
The volume phase transition of microgels is one of the most paradigmatic examples of stimuli-responsiveness, enabling a collapse from a highly swollen microgel state into a densely coiled state by an external stimulus. Although well charac…
View article: Three-Dimensional Electrochemical Axial Lithography on Si Micro- and Nanowire Arrays
Three-Dimensional Electrochemical Axial Lithography on Si Micro- and Nanowire Arrays Open
A templated electrochemical technique for patterning macroscopic arrays of single-crystalline Si micro- and nanowires with feature dimensions down to 5 nm is reported. This technique, termed three-dimensional electrochemical axial lithogra…
View article: Surface Patterning with SiO<sub>2</sub>@PNiPAm Core–Shell Particles
Surface Patterning with SiO<sub>2</sub>@PNiPAm Core–Shell Particles Open
Colloidal lithography is a cost-efficient method to produce large-scale nanostructured arrays on surfaces. Typically, colloidal particles are assembled into hexagonal close-packed monolayers at liquid interfaces and deposited onto a solid …