Jörg Peter Kutter

Realization of a prototype industrial on-line sensing system for ammonium based on micro system technology: results and future perspectives

A prototype sensing-system for ammonia in water matrices has been designed and tested. The sensor is based on colorimetric detection (the indophenol blue reaction). It has been designed keeping in mind the features and performance parameters important for on-line sensing in industrial environments, such as effective sample pre-filtering, auto-calibration, low reagent consumption and short response time.

Integrated Back-side Photodiodes as Part of a Single Substrate Integrated Chemiluminescent Detection System

Back-side contacted photodiodes detecting chemiluminescence in a microsystem are presented. These photodiodes absorb radiation far from their active regions and have a number of advantages compared to traditional photodiodes when integrated in micro total analysis systems (µTAS).

Characterization of Flows in Laser-machined Polymeric Microchannels

We have examined pressure-driven and electroosmotically-driven flows in laser-machined microchannels having characteristic Gaussian-like cross-sections and various degrees of surface roughness.

Computer Modeling as a Design Tool for Microfluidic Structures

As the field of microfluidics is maturing, increasingly intricate microsystems are fabricated. This complexity is making the conventional approach of intuitive design of microfluidic structures more difficult or even impossible. In many cases numerous rounds of design, fabrication and testing are required to arrive at microstructures with optimal performance. Computer modeling can significantly shorten this process by suggesting the optimal design on beforehand. The behavior of individual components as well as the interplay between integrated components can be predicted. Here we present the optimization by computer modeling of a microfluidic structure for single step coaxial flow. Experimental characterization of the fluid behavior in the microfluidic structures is presented and compared to predictions from the model.

In-plane UV-absorbance Detection in Silicon-based Electrophoresis Devices Using Monolithically Integrated Optical Waveguides

A silicon-based capillary electrophoresis device with monolithically integrated UV transparent waveguides and electrically insulated channels is presented. A separation with UV absorbance detection at 254 nm was performed. The applicability of Plasma-enhanced Chemical Vapor Deposited (PECVD) silica as electrical insulation is furthermore investigated.