A5042644230- Nanofabrication and Lithography Techniques
- Surfactants and Colloidal Systems
- Advancements in Photolithography Techniques
- Microfluidic and Capillary Electrophoresis Applications
- Pickering emulsions and particle stabilization
- Advanced Surface Polishing Techniques
- Photochemistry and Electron Transfer Studies
- Photochromic and Fluorescence Chemistry
- Force Microscopy Techniques and Applications
- Nanomaterials and Printing Technologies
- Additive Manufacturing and 3D Printing Technologies
- Microfluidic and Bio-sensing Technologies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Proteins in Food Systems
- Nonlinear Optical Materials Studies
- Biosensors and Analytical Detection
- Surface Modification and Superhydrophobicity
- Liquid Crystal Research Advancements
- Phase Equilibria and Thermodynamics
- Electrostatics and Colloid Interactions
- Diatoms and Algae Research
- Organic Electronics and Photovoltaics
- Analytical Chemistry and Chromatography
- Advanced Biosensing Techniques and Applications
- Analytical Chemistry and Sensors
Joanneum Research
2012-2025
Folkwang University of the Arts
1993-2008
University of Siegen
1994-2008
Infineon Technologies (Germany)
2003-2005
Rutherford Appleton Laboratory
1999-2002
University of Hull
1999-2000
Imperial College London
2000
University of Delaware
1999
We have studied the compression and structure of compressed monolayers sulfate polystyrene latex particles on air/water octane/water interfaces. If sufficiently (on a Langmuir trough) at surfaces give rafts hexagonally packed particles, while those oil/water interfaces undergo transition from originally hexagonal to rhombohedral structure. found that beyond collapse particle both fold corrugate, there is no expulsion individual or aggregates interface. In case interfaces, structuring (below...
Using a laser tweezers method, we have determined the long-range repulsive force as function of separation between two charged, spherical polystyrene particles (2.7 microm diameter) present at nonpolar oil-water interface. At large separations (6 to 12 particle centers) is found decay with distance power -4 and insensitive ionic strength aqueous phase. The results are consistent model in which repulsion arises primarily from presence very small residual electric charge particle-oil This...
Top-down fabrication of nanostructures with high throughput is still a challenge. We demonstrate the fast (>10 m/min) and continuous multilength scale structures by roll-to-roll UV-nanoimprint lithography on 250 mm wide web. The large-area nanopatterning enabled multicomponent UV-curable resist system (JRcure) viscous, mechanical, surface properties that are tunable over range to either allow for usage as polymer stamp material or imprint resist. adjustable elasticity chemistry enable...
We report a study of the compression monolayers monodisperse spherical polystyrene particles at interface between aqueous surfactant solutions and octane. The particle size (2.6 μm diameter) was selected so that direct in situ microscopic observation monolayer structure could be made during lateral "collapse". Monolayers have been formed on miniature Langmuir trough placed microscope stage. Our has focused (a) relationship collapse pressure, Πcol, interfacial tension, γ*, oil/water absence...
Long distance movement (>20 mm) of water droplets across thiol–acrylate photopolymers with inscribed wettability and Laplace pressure gradient is demonstrated.
Lateral flow tests (LFTs) had a pivotal role in combating the spread of SARS-CoV-2 virus throughout COVID-19 pandemic thanks to their affordability and ease use. Most LFT devices were based on nitrocellulose membrane strips whose industrial upscaling billions has already been extensively demonstrated. Nevertheless, assay option an format is largely restricted qualitative detection target antigens. In this research, we surveyed potential UV nanoimprint lithography (UV-NIL) extrusion coating...
Abstract Anti‐sticking coatings are an integral part of imprint processes since they facilitate effortless and defect‐free demolding stamp imprint. A low surface energy is important for easy clean removal the from enabling a long lifetime expensive stamp, whereas conformality anti‐sticking coating to preserve designed structure dimensions (aspect ratio, critical dimensions, pitch size, etc.). Within this paper branched perfluoro polyether acrylate monomer polymerized first time by initiated...
Roll-to-roll UV nanoimprint lithography has superior advantages for high-throughput manufacturing of micro- or nano-structures on flexible polymer foils with various geometries and configurations. Our pilot line provides large-scale structure imprinting cost-effective biochips (4500 biochips/hour), enabling rapid multiplexed detections. A complete high-volume process chain the technology producing structures like μ-sized, triangular optical out-couplers capillary channels (width: from 1 μm...
The diatoms are ubiquitous, exist in large numbers and show a great diversity of features on their porous silica structures. Therefore, they inspire the fabrication nanostructured templates for nanoimprint processes (NIL), where structured areas with nanometer precision required. In this study, two approaches regarding respective challenges potential exploitations followed discussed: first one takes advantage template that is directly made natural occurring diatoms. Here, replication steps...
We report on ITO-free OLEDS with a transparent hybrid Cu nanoparticle grid/PEDOT:PSS electrode processed in ambient conditions. An experimentally based methodology was implemented, where studies alternative PEDOT:PSS derivatives and grid design were performed, to gradually increase the efficiency of lab scale OLEDs. To further performance, inkjet-printed (IJP) Cu-grids are embedded flatten electrode, reduce leakage current enhance homogeneity efficiency. Finally, OLEDs showed power...
The nanoimprint replication of biomimetic nanostructures can be interesting for a wide range applications. We demonstrate the process chain Morpho-blue-inspired nanostructures, which are especially challenging process, since they consist multilayer undercut structures, typically cannot replicated using lithography. To achieve this, we used specially made, proprietary imprint material to firstly allow successful stamp fabrication from an master structure, and secondly enable UV-based...
The problem of capillary condensation vapour between two solid surfaces has been considered. effects on arising from both the line tension at solid/liquid/vapour contact and surface forces bodies have taken into account. stability liquid bridges in different geometries analysed relation to relative pressure, distance their chemistry. main objective investigate how existence influences bridge formation illustrate possible ways for estimation observation beds monodisperse spherical particles...
There is currently considerable interest in the measurement of line tension. A method has been proposed involving capillary condensation vapour around contact (or near contact) a solid sphere and flat plate same material. This configuration locally equivalent to that used conventional surface force apparatus (SFA), which employs (coated) mica surfaces are molecularly smooth.
N-Methylhydroxystilbazolium bromide was photolyzed in aqueous and nonaqueous AOT lyotropic liquid crystalline systems isooctane-based inverted micelles or microemulsions. A competition between trans → cis photoisomerization photodimerization found, the latter prevailing with bent interfaces. The AOT−glycerol phase diagram measured. It exhibits a lamellar at 35 75% w/w an hexagonal >85% AOT. clearing temperatures TLI TiHI (as observed transitions from to isotropic micellar of AOT−water−decane...
We report a large scale preparation of bioimprints layers cultured leukemic HL60 cells which can perform cell shape and size recognition from mixture with peripheral blood mononuclear (PBMCs).
A high throughput manufacturing process of microfluidic chips based on Roll-to-Roll imprinting is presented. With this procedure, patterns can be produced large area polymer substrates. The subsequent steps inlet drilling, bonding and electrode printing are set-up processes, too. Overall, strategy allows highly parallelized processing numbers chips—all costly individual chip handling avoided. were used for the characterization inorganic ions soil nutrient analysis.
We report on our development strategy of photo-curable resists for nanoimprint lithography (NIL) based modularity. Starting with a basic formulation, we address two topics: the integration fluorinated additives and enhancement dry etching stability. prove both concepts by introduction different derived from same formulation. The viscosity novel resist materials was optimized inkjet dispensing at room temperature (RT). can be applied either in NIL batch processes or high-throughput roller...
Roll-to-Roll-UV-nanoimprint lithography (R2R-UV-NIL) enables high resolution large area patterning of flexible substrates and is therefore increasing industrial interest. We have set up a custom-made R2R-UV-NIL pilot machine which able to convert 10 inch wide web with velocities 30 m/min. In addition, we developed self-replicable UV-curable resins tunable surface energy Young's modulus for UV-imprint material as well polymer working stamp/shim manufacturing. Now designed test patterns the...
Roll-to-roll UV nanoimprinting is a powerful method for the mass fabrication of nano- and microstructured surfaces, which are highly interesting many technological applications (e.g., in fields optics, electronics, biomimetic, microfluidics). When setting up production process based on this technique, one main challenges prevention defects (mainly entrapped air during filling fractures demolding). This can be cost- time-intensive as it mainly done by trial error. An improved theoretical...
Abstract Microemulsions composed of Aerosol OT (AOT), isooctane, and water in the mass ratio 1:1. 54:0.75 exhibit percolation, i.e., transition from a w/o to an o/w microemulsion, at 33 °C as revealed by appearance conductivity. In presence 0.01 mol/dm 3 acridizinium bromide percolation temperature increases 38 °C. Irradiation this mixture with glass‐filtered light leads further rise 43 Thus, system can be switched conducting non‐conducting upon irradiation between