A5072076684- Advanced MRI Techniques and Applications
- Advanced MEMS and NEMS Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Photonic and Optical Devices
- Acoustic Wave Resonator Technologies
- Mechanical and Optical Resonators
- Semiconductor Lasers and Optical Devices
- Advanced NMR Techniques and Applications
- Microfluidic and Bio-sensing Technologies
- Electrowetting and Microfluidic Technologies
- Electrochemical sensors and biosensors
- Innovative Energy Harvesting Technologies
- NMR spectroscopy and applications
- Molecular Junctions and Nanostructures
- Adhesion, Friction, and Surface Interactions
- Atomic and Subatomic Physics Research
- Magnetic Bearings and Levitation Dynamics
- Analytical Chemistry and Sensors
- Wireless Power Transfer Systems
- Advanced Battery Materials and Technologies
- Advanced Sensor and Energy Harvesting Materials
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Materials and Mechanics
- High-Temperature Coating Behaviors
- Optical Polarization and Ellipsometry
Karlsruhe Institute of Technology
2015-2024
Karlsruhe University of Education
2024
University of Freiburg
2009-2018
Institute of Non-ferrous and Rare Metals
2003-2018
Sensors (United States)
2007
University of Maryland, College Park
2007
University System of Maryland
2006
École Polytechnique Fédérale de Lausanne
2002-2004
National Institute for Research and Development in Microtechnologies
2000-2003
Sodium superionic conductors (NASICON) are pivotal for the functionality and safety of solid-state sodium batteries. Their mechanical properties ionic conductivity key performance metrics, yet their correlation remains inadequately understood. Addressing this gap is vital concurrent enhancements in both properties. This study summarizes recent literature on sintered polycrystalline NASICON solid electrolyte Na1+xZr2SixP3-xO12 (NZSP, 0≤x ≤ 3), focusing its conductivity, identifies a positive...
We report the fabrication of 3D micro coils made with an automatic wire bonder. Using standard MEMS processes such as spin coating and UV lithography on silicon Pyrex® wafers results in high aspect ratio SU-8 posts diameters down to 100 µm that serve mechanical stabilization yokes for coils. The bonder is employed wind 25 insulated gold around arbitrary (e.g. solenoidal) path, yielding arrays Each coil bonded directly on-chip, so loose ends are avoided and, compared other winding methods,...
Nuclear magnetic resonance spectroscopy (NMR) and imaging (MRI) are important non-destructive investigative techniques for soft matter research. Continuous advancements have not only lead to more sensitive detection, new applications, but also enabled the shrinking of detectable volume sample, a reduction in time needed acquire spectrum or image. At same time, advances microstructuring on-chip laboratories continued unabated. In recent years these two broad areas been productively joined...
We present a completely revised generation of modular micro-NMR detector, featuring an active sample volume ∼ 100 nL, and improvement 87% in probe efficiency. The detector is capable rapidly screening different samples using exchangeable, application-specific, MEMS-fabricated, microfluidic containers. In contrast to our previous design, the holder chips can be simply sealed with adhesive tape, excellent adhesion due smooth surfaces surrounding fluidic ports, so withstand pressures ∼2.5 bar,...
We present for the first time a fully MEMS-integrated technology to manufacture 3D geometrically perfect solenoidal microcoils microscale MRI applications. report 25 µm isotropic resolution MR images of copper sulfate aqueous phantom. These are acquired using with 5 windings insulated diameter Au wire and quality factors as high 46 at operating frequency (400 MHz).
We present a lab on chip (LOC) compatible modular platform for magnetic resonance (MR)-based investigation of sub-millimetre samples. The combines the advantages offered respectively by microcoils (high resolution at microscale) and macroscopic surface coils (large field view) as MR-detectors consists phased array (PAMs) providing flat MR-sensitive area 18.3 mm2 with B0-field uniformity better than 0.25 ppm in sensor centre area. demonstrate both high-resolution imaging (MRI) NMR...
In this study, we report on a novel, multi-use, high-resolution NMR/MRI micro-detection probe for the screening of flat samples. It is based Helmholtz coil pair in centre probe, built out two 1.5 mm diameter wirebonded copper coils, resulting homogeneous distribution magnetic field. For liquids and suspensions, custom fabricated, disposable sample inserts are placed inside aligned automatically, preventing sensor samples from contamination. The was successfully tested 500 MHz (11.7 T)...
High entropy alloys are a newly developed class of alloys, which tend to form single solid solution or mixture solutions with simple crystal structures. These possess excellent mechanical properties, thermal stability and corrosion resistance. In the present paper, an AlCoCrFeNiTi high alloy was obtained by induction melting, influence remelting process on resistance characteristics investigated. Thus, optical scanning electron microscopy revealed less phase segregation fine dendritic...
We present an integrated microfluidic device for on-chip nuclear magnetic resonance (NMR) studies of microscopic samples. The devices are fabricated by means a MEMS compatible process, which joins the automatic wirebond winding solenoidal microcoils and manufacturing complex network using dry-photoresist lamination. wafer-scale cleanroom process is potentially capable mass fabrication. Since non-invasive NMR analysis technique rather insensitive, particularly when sample volumes to be...
Yttria-doped zirconia, lead zirconate titanate (PZT) and barium were successfully obtained using hydrothermal procedures. Based on these results mathematical models describing the correlation between nanopowders' characteristics main synthesis parameters are proposed.
This article describes the development and testing of first automatically microfabricated probes to be used in conjunction with magic angle coil spinning (MACS) NMR technique. spectroscopy is a versatile technique for large range applications, but its intrinsically low sensitivity poses significant difficulties analyzing mass- volume-limited samples. The combination microfabrication technology MACS addresses several well-known issues concerted manner time: (i) reproducible wafer-scale...
We introduce a newly developed polymer magnetic composite for use as high resistivity, permeability core to significantly improve the energy consumption of micromachined inductive suspensions. Compared similar suspension structure without core, electrical current required obtain levitation height 110 μm is 65 mA versus 120 mA. The brings operating temperature in ambient air at 27 °C down from 60 °C, lowest value among all previously reported Beyond this performance improvement, present...
In this letter, we present a new hybrid micromachined contactless suspension based on combining electromagnetic inductive and electrostatic actuation. addition, the stiffness components are dynamically adjusted during operation phase using series of electrodes integrated in structure. We experimentally demonstrate vertical linear positioning disk-shaped proof mass range from 30 to 200 μm, controlled tilting about two orthogonal axes horizontal plane ranges ±1° ±4°, as well oscillation axis...
We present a comprehensive experimental investigation of micromachined inductive suspension (MIS) based on 3D wire-bonded microcoils. A theoretical model has been developed to predict the levitation height disc-shaped proof mass (PM), which good agreement with results. The MIS consists two coaxial coils, inner coil being used for levitation, while outer stabilization PM. behavior is mapped respect input parameters excitation currents applied and coil, respectively: amplitude frequency. At...
We present a new concept for spatial scanning hyperspectral imaging. Spatial is one of the main methods used data acquisition and can provide high spectral resolution over wide range. However, conventional techniques, such as whiskbroom pushbroom suffer from need relative motion between target imaging system, which increases complexity on hardware side limits application possibilities. Our approach combines rotating slit co-rotating Dove prism. The scans image by selecting line at each...
We present a sustainable fabrication method for cheap point-of-care microfluidic systems, employing hot embossing of natural shellac as key feature an energy-efficient that exclusively uses renewable materials consumables. Shellac is low-cost biomaterial features medium hydrophilicity (e.g., water contact angle ca. 73°) and high chemical stability with respect to common solvents such cyclohexane or toluene, rendering it interesting candidate microfluidics competitor well-known systems...
Abstract Dielectrophoresis is a powerful and well-established technique that allows label-free, non-invasive manipulation of cells particles by leveraging their electrical properties. The practical implementation the associated electronics user interface in biology laboratory, however, requires an engineering background, thus hindering broader adoption technique. In order to address these challenges bridge gap between biologists skills required for DEP platforms, we report here custom-built,...
We address the miniaturization of power converters by introducing novel 3-D microtransformers with magnetic core for low-megahertz frequency applications. The is fabricated lamination and microstructuring Metglas 2714A alloy. solenoids are wound around using a ball-wedge wirebonder. wirebonding process fast, allowing fabrication up to 40 turns in 10 s. devices yield high inductance per unit volume 2.95 μH/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...