Hans‐Jürgen Butt
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View article: When contact lines remember: Surface charge and the evolving interaction with defects
When contact lines remember: Surface charge and the evolving interaction with defects Open
The motion of contact line plays a crucial role in both natural phenomena and industrial processes. While it is well known that surface defects influence contact line dynamics, we demonstrate that their impact depends not only on geometry,…
View article: Stood-up drop to determine receding contact angles
Stood-up drop to determine receding contact angles Open
A robust alternative method to measure receding contact angles is suggested.
View article: Growing functional artificial cytoskeletons in the viscoelastic confinement of DNA synthetic cells
Growing functional artificial cytoskeletons in the viscoelastic confinement of DNA synthetic cells Open
Intracellular structures, such as cytoskeletons, form within a crowded cytoplasm with viscoelastic properties. While self-assembly in crowding is well studied, the effects of coupled viscoelastic environments remain elusive. Here we engine…
View article: Contact line friction of bubbles
Contact line friction of bubbles Open
Contact line friction (CLF) of bubbles is ubiquitous, from bubbles on a beer glass to H2 bubbles sliding over electrodes in electrolysis. However, a fundamental understanding of CLF of bubbles is still missing, mainly due to the challenge …
View article: Metal Nanodot Array via Thin Oil Layer‐Assisted Dropwise Solid‐State Dewetting
Metal Nanodot Array via Thin Oil Layer‐Assisted Dropwise Solid‐State Dewetting Open
Precise control of metal nanodot arrays is crucial for optimizing their plasmonic, catalytic, and photonic properties. Fabrication methods for homogeneous nanodots generally rely on complex processes, such as lithography or layer‐by‐layer …
View article: A Method for in Situ Interfacial pH Detection
A Method for in Situ Interfacial pH Detection Open
Functionalized silica-based surfaces are widely used across industries, from semiconductors to pharmaceuticals. Aminosilanes are commonly employed as coupling agents during surface functionalization to anchor diverse functional molecules. …
View article: Tethered Cation Size Affects the Imbibition of Polymerized Ionic Liquids and the Ionic Conductivity in Nanopores
Tethered Cation Size Affects the Imbibition of Polymerized Ionic Liquids and the Ionic Conductivity in Nanopores Open
There is a growing interest in new polymerized ionic liquids (PILs) with enhanced ion transport properties especially at low temperatures, in the vicinity of the liquid-to-glass temperature, T g. We employed two structurally similar ionic …
View article: Friction Measurements with Picoliter Droplets Using Scanning Probe Microscopy
Friction Measurements with Picoliter Droplets Using Scanning Probe Microscopy Open
Topographical and chemical defects on solid surfaces tend to pin three-phase contact lines of moving liquid drops. Our quantitative understanding of the pinning process is, however, still poor. Here we use an atomic force microscope to sli…
View article: Surfactants Screen Slide Electrification
Surfactants Screen Slide Electrification Open
Water drops spontaneously accumulate charges when they move on hydrophobic dielectric surfaces by slide electrification. Slide electrification generates electricity with possible applications on tiny devices. The potential of up to 1 KV ge…
View article: Nanofilament-Coated Membranes with Enhanced Scaling and Biofouling Resistance for Membrane Distillation
Nanofilament-Coated Membranes with Enhanced Scaling and Biofouling Resistance for Membrane Distillation Open
Membrane distillation (MD) for water treatment can be applied in high salinity conditions and for treatment of wastewater. Current commercial membranes are made of fluorinated polymers such as polytetrafluoroethylene (PTFE). Here, porous m…
View article: Wetting of Surface Grafted Hydrophilic‐ <i>b</i> ‐Hydrophobic Block Copolymer Brushes
Wetting of Surface Grafted Hydrophilic‐ <i>b</i> ‐Hydrophobic Block Copolymer Brushes Open
The wetting of diblock copolymer brushes by water is studied. Th goal of this work is to understand how the thickness of the bottom and top copolymer block affect the wetting behavior, respectively. For the synthesis of diblock copolymer b…
View article: Tuning the Morphology and Structure of Supraparticles Composed of Ellipsoids
Tuning the Morphology and Structure of Supraparticles Composed of Ellipsoids Open
Evaporating droplets of colloidal dispersions on superamphiphobic surfaces is a versatile way to fabricate supraparticles with complex shape and internal morphology. Here, we investigated experimentally the formation of supraparticles cons…
View article: Spontaneous Charging from Sliding Water Drops Determines the Interfacial Deposition of Charged Solutes
Spontaneous Charging from Sliding Water Drops Determines the Interfacial Deposition of Charged Solutes Open
It has been discovered during the last decade that when water drops slide on hydrophobic surfaces, they spontaneously leave negative charges along the drop path. The drops become positively charged with a potential of 1 kV. This process, c…
View article: Enhancing liquid–vapor phase behavior through multiscale anisotropic wettability gradient in dandelion-inspired nanostructures
Enhancing liquid–vapor phase behavior through multiscale anisotropic wettability gradient in dandelion-inspired nanostructures Open
This research developed an approach to engineering multiscale anisotropic wettability gradients through the design of dandelion-inspired nanostructures, enabling both horizontal and vertical biphilicity.
View article: Drop splitting on hydrophobic wedge-shaped tips after central impact: effect of sharpness and wetting properties
Drop splitting on hydrophobic wedge-shaped tips after central impact: effect of sharpness and wetting properties Open
Does a knife-like wedge-shaped tips always split a centrally impacting water drop? Here, we combine experiments and volume of fluid (VOF) simulations to investigate this process. The answer might surprise you—find out in this manuscript.
View article: Liquid slide electrification: advances and open questions
Liquid slide electrification: advances and open questions Open
This review is about drops of a liquid with high dielectric permittivity that slide over a solid surface with high electrical resistivity.
View article: Surface Engineering of Polymeric Colloidal Crystals by Temperature – Pressure Annealing
Surface Engineering of Polymeric Colloidal Crystals by Temperature – Pressure Annealing Open
Polymer colloidal crystals (PCCs) have been widely explored as acoustic and optical metamaterials and as templates for nanolithography. However, fabrication impurities and fragility of the self‐assembled structures are critical bottlenecks…
View article: Growing functional artificial cytoskeletons in the viscoelastic confinement of DNA synthetic cells
Growing functional artificial cytoskeletons in the viscoelastic confinement of DNA synthetic cells Open
Intracellular structures, like the cytoskeletons, form within a crowded cytoplasm with defined viscoelastic properties. While crowding effects on self-assembly are well studied, the role of viscoelasticity in regulating structure formation…
View article: Surface‐Templated Polymer Microparticle Synthesis Based on Droplet Microarrays
Surface‐Templated Polymer Microparticle Synthesis Based on Droplet Microarrays Open
Polymer microparticle synthesis based on the surface‐templated method is a simple and environmentally friendly method to produce various microparticles. Unique particles with different compositions can be fabricated by simply annealing a p…
View article: Bioinspired Capillary Force-Driven Super-Adhesive Filter
Bioinspired Capillary Force-Driven Super-Adhesive Filter Open
Capturing particles with low, nanonewton scale adhesion is an ongoing challenge for conventional air filters1,2. Inspired by the natural filtration capabilities of mucus-coated nasal hairs3-7, we introduce an efficient biomimetic filter th…
View article: Estimating sliding drop width via side-view features using recurrent neural networks
Estimating sliding drop width via side-view features using recurrent neural networks Open
High speed side-view videos of sliding drops enable researchers to investigate drop dynamics and surface properties. However, understanding the physics of sliding requires knowledge of the drop width. A front-view perspective of the drop i…
View article: Thickness of Nanoscale Poly(Dimethylsiloxane) Layers Determines the Motion of Sliding Water Drops
Thickness of Nanoscale Poly(Dimethylsiloxane) Layers Determines the Motion of Sliding Water Drops Open
Layers of nanometer thick polydimethylsiloxane (PDMS) are applied as hydrophobic coatings because of their environmentally friendly and chemically inert properties. In applications such as heat exchangers or fog harvesting, low water drop …
View article: Control of spontaneous charging of sliding water drops by plasma-surface treatment
Control of spontaneous charging of sliding water drops by plasma-surface treatment Open
Slide electrification is the spontaneous separation of electric charges at the rear of water drops sliding over solid surfaces. This study delves into how surfaces treated with a low-pressure plasma impact water slide electrification. Ar, …
View article: Condensation of water on PDMS-coated copper surfaces for fresh water harvesting
Condensation of water on PDMS-coated copper surfaces for fresh water harvesting Open
With an increased need to solve fresh water scarcity for humanity in many places around the world, dew water harvesting is one promising approach to improve the situation. While condensation from humid air has been a research topic for man…
View article: Contribution of wedge and bulk viscous forces in droplets moving on inclined surfaces
Contribution of wedge and bulk viscous forces in droplets moving on inclined surfaces Open
Employing direct numerical simulations, we investigate water and water-glycerol (85 wt%) droplets ( $$\sim $$ 25 µL) moving on smooth surfaces, with contact angles of around 90 $$^{\circ }$$ , at varying inclinations. Our focus is on …
View article: How Surface and Substrate Chemistry Affect Slide Electrification
How Surface and Substrate Chemistry Affect Slide Electrification Open
When water droplets move over a hydrophobic surface, they and the surface become oppositely charged by what is known as slide electrification. This effect can be used to generate electricity, but the physical and especially the chemical pr…