Publications de Shady Didier Gawad

Substrate arrays of iridium oxide microelectrodes for in-vitro neuronal interfacing

Philippe Renaud, Henry Markram, Marc Olivier Heuschkel, Michele Giugliano, Shady Didier Gawad

The design of novel bidirectional interfaces for in vivo and in vitro nervous systems is an important step towards future functional neuroprosthetics. Small electrodes, structures and devices are necessary to achieve high-resolution and target-selectivity ...

2009

Impedance spectroscopy flow cytometry: On-chip label-free cell differentiation

Philippe Renaud, Shady Didier Gawad, Karen Cheung

Background: The microfabricated impedance spectroscopy flow cytometer used in this study permits rapid dielectric characterization of a cell population with a simple microfluidic channel. Impedance measurements over a wide frequency range provide informati ...

2005

Dielectric spectroscopy in a micromachined flow cytometer: theoretical and practical considerations

Philippe Renaud, Arnaud Bertsch, Shady Didier Gawad, Urban Seger, Karen Cheung

We propose a model to determine the influence of different cell properties, such as size, membrane capacitance and cytoplasm conductivity, on the impedance spectrum as measured in a microfabricated cytometer. A dielectric sphere of equivalent complex permi ...

2004

Cell immersion and cell dipping in microfluidic devices

Philippe Renaud, Arnaud Bertsch, Shady Didier Gawad, Urban Seger

Combining deflective dielectrophoretic barriers with controlled pressure driven liquid flows in microfluidic devices allows accurate handling of particles such as biological cells in suspensions. Working towards cell-based lab-on-a-chip applications, a pla ...

2004

Dielectric spectroscopy in a microfabricated flow cytometer

Shady Didier Gawad

In this thesis, a new microfabricated flow cytometer for single cell discrimination based on dielectric spectroscopy is presented. Integrated tools for rapid in-flow cell handling are also demonstrated. Signal amplification and analysis as well as the chip ...

EPFL2004