A5085065614- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Near-Field Optical Microscopy
- Electrocatalysts for Energy Conversion
- Surface Modification and Superhydrophobicity
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Cellulose Research Studies
- Ferroelectric and Piezoelectric Materials
- Postharvest Quality and Shelf Life Management
- Nanofabrication and Lithography Techniques
- Material Properties and Processing
- Fuel Cells and Related Materials
- Plant Physiology and Cultivation Studies
- Diamond and Carbon-based Materials Research
- Advanced battery technologies research
- Advanced Surface Polishing Techniques
- Electronic and Structural Properties of Oxides
- Advanced MEMS and NEMS Technologies
- Microfluidic and Bio-sensing Technologies
- Multiferroics and related materials
- Catalytic Processes in Materials Science
- Immune Response and Inflammation
- Innovative Microfluidic and Catalytic Techniques Innovation
- Crop Yield and Soil Fertility
- Berry genetics and cultivation research
Institute of Materials Science
2025
Technical University of Darmstadt
2015-2024
Universität Ulm
2024
Mie University
2023
RMIT University
2022
Freshfields Bruckhaus Deringer
2018
University of Arkansas at Monticello
2017
Harris Health System
2013
Center for NanoScience
2003-2012
Ludwig-Maximilians-Universität München
2003-2012
The limiting role of phosphorus on leaf decomposition and primary producers was investigated in a second—order woodland stream Tennessee by experimentally enriching, for 95 d, adjacent reaches with an average 60 450 mg PO 4 —P/L, respectively, over upstream control levels °4 mg/L. Red oak (Quercus rubra) packs the enriched sections lost mass 24% faster than (P < .05). Nitrogen content increased 60% more, P 83% more respective increases Differences loss N between low high enrichments were...
Transient forces between nanoscale objects on surfaces govern friction, viscous flow, and plastic deformation, occur during manipulation of matter, or mediate the local wetting behavior thin films. To resolve transient (sub) microsecond time nanometer length scale, dynamic atomic force microscopy (AFM) offers largely unexploited potential. Full spectral analysis AFM signal completes AFM. Inverting formation process, we measure course effective at sensing tip. This approach yields rich...
The effect of O2 plasma treatment on surface energy, topography and chemistry the negative photoresist epoxy novolak SU-8 was investigated by contact angle goniometry, atomic force microscopy (AFM) x-ray photoelectron spectroscopy (XPS). Directly after treatment, surfaces were completely wetted water with a between below 5°. free energy can be increased significantly depending dose. remained hydrophilic for several months showing moderate hydrophobic recovery. treated showed formation...
Bacterial fouling on surfaces significantly increases the resistance of bacteria toward antibiotics, which leads to medical complications and a corresponding financial burden. Here, we report general robust technique for facile modification various with different antibacterial agents. Our approach in this study was inspired by strong adhesion mussel proteins (MAPs) many types surfaces, including metals, polymers, inorganic materials. Thus, glass polymeric slides were dip-coated dopamine, as...
Nickel oxide/hydroxides [NiOx(OH)y] are considered to be promising materials replace noble metals for the oxygen evolution reaction in alkaline media. While several studies showed that iron impurities promote activity of nickel-based catalysts, effects intrinsic nickel defects and underlying mechanism remain unknown. In this work, X-ray photoelectron spectroscopy is combined with surface-enhanced Raman scattering understand reactivity NiOx thin films, which were prepared at different...
In this work, the influences of various transition metal ions as active sites in high purity metal- and nitrogen-doped carbon catalysts (in short M–N–C), where M: Mn3+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, or Sn4+ catalyst powders, were systematically investigated for electrochemical reduction CO2 aqueous electrolyte. The almost exclusive presence isolated M–N4 centers catalytic was determined by X-ray photoelectron spectroscopy (XPS). electrochemically a gas diffusion electrode arrangement bypass...
Organs-on-a-Chip (OOCs) have recently led to major discoveries and a better understanding of 3D cell organization, cell-cell interactions tissue response drugs biological cues. However, their complexity variability are still limited by the available fabrication technology. Transparent, cytocompatible high-resolution 3D-printing could overcome these limitations, offering flexible low-cost alternative soft lithography. Many advances been made in stereolithography printing regarding resin...
In tapping-mode atomic-force microscopy usually amplitude and phase of the cantilever motion are acquired. These signals related to fundamental oscillation frequency neglecting information at higher frequencies. However, nonlinear contact between tip sample induces vibrations that harmonics fundamental. order recover available full has be analyzed. The can employed for image formation. A setup consists two independently operated lock-in amplifiers is used detect in dynamic signal. Higher...
The first successful growth of diamond layers on levitated seed particles in CH4/H2 plasma is presented. were grown a rf chamber equipped with tungsten hot filament. injected are negatively charged and under the balance several forces, chemical vapor deposition takes place them. SEM images show that crystalline structures formed after coagulation islands. micro-Raman spectroscopy particle hours shows clear peak assigned to diamond.
Abstract Manganese oxide (MnO x ) is considered a promising material for the oxygen evolution reaction (OER) to replace noble metal catalysts in water splitting. The improvement of MnO requires mechanistic and kinetic knowledge four‐electron transfer steps OER. X‐ray photoelectron spectroscopy, widely used tool characterize electronic structure thin films, combination with surface‐enhanced Raman spectroscopy gain deeper different mixed types their respective change chemical composition....
Abstract The linking of our macroscopic world to the nanoscopic single molecules, nanoparticles and functional nanostructures is a technological challenge. Researchers in nanobiotechnology face questions “How extract analyze nano‐object?”, pick place nano‐objects?” prototype nanostructure?”. Here, nanomanipulation by an atomic force microscope (AFM) combination with optical manipulation microbeam laser offers practicable solution. In such system, AFM can be operated as nanorobot for purposes...
Summary A retail package system was used to study the atmosphere modification which developed within packages of shredded Iceberg lettuce, sealed in trays with a range polymer films different gas permeabilities (oxygen permeability 3000 10,000 ml/m 2 /day/atm. at 25°C). Modified atmospheres were produced both naturally by respiration, and application flushing techniques. The effects these modified conditions on visual sensory quality lettuce observed monitoring colour change development...
The dynamics of the microcantilever in atomic force microscopy (AFM) is represented by a multiple-degrees-of-freedom state-space model and discussed within framework system theory. cantilever modeled as linear time-invariant with nonlinear output feedback due to tip-sample interaction. This allows one use same analyze different aspects such contact-mode or tapping-mode AFM. approach dynamic response AFM for numerically efficient simulations. We show that not only eigenfrequency but also...
In order to test for nitrogen limitation and examine ammonium uptake by stream sediments, hydroxide was added continuously at concentrations averaging 100 μg1 ‐1 70 days a second‐ reach of Walker Branch, an undisturbed woodland in Tennessee. Ammonium during the first 4h addition corresponded adsorption kinetics rather than first‐order or Michaelis‐ Menten kinetics. However, calculated partition coefficient two four orders magnitude greater values reported physical ammonium, suggesting that...
Atomic force microscopy on polymer surfaces is commonly carried out in the repulsive amplitude modulation mode (tapping mode). In order to achieve an additional measurement of electrostatic quantities under ambient conditions a higher flexural eigenmode used for electrical characterization surface during imaging. The resonantly excited by small ac-bias voltage between tip and sample. Thus, topography electric potential are measured simultaneously this multifrequency method. However, strong...