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Haute Ecole d'Ingénierie

Etude et amélioration d'une électrovalve

Favre, Lionel ; Chevailler, Samuel (Dir.)

Mémoire de bachelor : Haute Ecole d'Ingénierie, 2017.

L’objectif du projet est d’étudier une électrovanne miniature. Dans certaines applications médicales, le bruit de la vanne est dérangeant, plusieurs solutions diminuant le bruit doivent être étudiées, implémentées et caractérisées.

Université de Neuchâtel

Performance of an Integrated Microoptical System for Fluorescence Detection in Microfluidic Systems

Roulet , Jean-Christophe ; Völkel, Reinhard ; Herzig, Hans Peter ; Verpoorte, Elisabeth ; de Rooij, Nicolaas F. ; Dändliker, René

In: Analytical Chemistry, 2020, vol. 74, no. 14, p. 3400-3407

This article presents a new integrated microfluidic/microoptic device designed for basic biochemical analysis. The microfluidic network is wet-etched in a Borofloat 33 (Pyrex) glass wafer and sealed by means of a second wafer. Unlike other similar microfluidic systems, elements of the detection system are realized with the help of microfabrication techniques and directly deposited on both sides...

Université de Neuchâtel

Carbon Isotope Fractionation During Volatilization of Petroleum Hydrocarbons and Diffusion Across a Porous Medium: A Column Experiment

Bouchard, Daniel ; Höhener, Patrick ; Hunkeler, Daniel

In: Environmental Science & Technology, 2008, vol. 42, no. 21, p. 7801–7806

The study focuses on the effect of volatilization, diffusion, and biodegradation on the isotope evolution of volatile organic compounds (VOCs) in a 1.06 m long column filled with alluvial sand. A liquid mixture of 10 VOCs was placed at one end of the column, and measurements of VOC vapor concentrations and compound-specific isotope ratios (δ13C) were performed at the source and along...

Université de Neuchâtel

Development of an Array of Ion-Selective Microelectrodes Aimed for the Monitoring of Extracellular Ionic Activities

Guenat, Olivier T. ; Generelli, Silvia ; de Rooij, Nicolaas F. ; Koudelka-Hep, Milena ; Berthiaume, François ; Yarmush, Martin L.

In: Analytical Chemistry, 2006, vol. 78, no. 21, p. 7453–7460

In this study, we present the development and the characterization of a generic platform for cell culture able to monitor extracellular ionic activities (K+, NH4+) for real-time monitoring of cell-based responses, such as necrosis, apoptosis, or differentiation. The platform for cell culture is equipped with an array of 16 silicon nitride micropipet-based...

Université de Neuchâtel

Measurement of the Bending Strength of Vapor−Liquid−Solid Grown Silicon Nanowires

Hoffmann, Samuel ; Utke, Ivo ; Moser, Benedikt ; Michler, Johann ; Christiansen, Silke H. ; Schmidt, Volker ; Senz, Stephan ; Werner, Peter ; Gösele, Ulrich ; Ballif, Christophe

In: Nano Letters, 2006, vol. 6, no. 4, p. 622–625

The fracture strength of silicon nanowires grown on a [111] silicon substrate by the vapor−liquid−solid process was measured. The nanowires, with diameters between 100 and 200 nm and a typical length of 2 μm, were subjected to bending tests using an atomic force microscopy setup inside a scanning electron microscope. The average strength calculated from the maximum nanowire deflection before...

Université de Neuchâtel

Monolithically integrated interferometer for optical displacement measurement

Hofstetter, Daniel ; Dändliker, R. (Dir.)

Thèse de doctorat : Université de Neuchâtel, 1996.

A monolithically integrated optical displacement sensor in the GaAs/AlGaAs material system has been developed, fabricated and characterized. The device was a double Michelson interferometer with an integrated light source, photodetectors, couplers and phase shifters. A key point of the work was the development of a single growth-step distributed Bragg reflector laser which served as the light...

Haute Ecole d'Ingénierie

Module de conversion statique : travail de bachelor : diplôme 2016

Dubosson, Maxime ; Barrade, Philippe (Dir.)

Mémoire de bachelor : Haute Ecole d'Ingénierie, 2016.

Ce travail de bachelor consiste au développement d’un module de conversion statique

Haute Ecole d'Ingénierie

Automatisation d’un Réacteur à Plasma

Volic, Davor ; Bützberger, Fariba (Dir.) ; Ellert, Christoph (Codir.)

Mémoire de bachelor : Haute Ecole d'Ingénierie, 2012.

Le but de ce projet est l’instrumentation, l’automatisation et la mise en service d’un réacteur à plasma employé pour la production de nouveaux matériaux. Dans un premier temps, l’effet du plasma est étudié sur des échantillons d’amidon placés dans le réacteur.

Université de Neuchâtel

High Resolution Interference Microscopy: A Tool for Probing Optical Waves in the Far-Field on a Nanometric Length Scale

Rockstuhl, Carsten ; Märki, Iwan ; Scharf, Toralf ; Salt, Martin Guy ; Herzig, Hans-Peter ; Dändliker, René

In: Current Nanoscience, 2006, vol. 2, no. 4, p. 337-350

High Resolution Interference Microscopy (HRIM) is a technique that allows the characterization of amplitude and phase of electromagnetic wave-fields in the far-field with a spatial accuracy that corresponds to a few nanometers in the object plane. Emphasis is put on the precise determination of topological features in the wave-field, called phase singularities or vortices, which are spatial...

Université de Neuchâtel

Synchronous and asynchronous detection of ultra-law light levels using CMOS-compatible semiconductor technologies

Lotto, Christian ; Seitz, Peter (Dir.) ; Charbon, Edoardo (Codir.) ; Enz, Christian (Codir.) ; Farine, Pierre-André (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2010.

This work presents significant improvements of noise performance in synchronous CMOS image sensors and in asynchronous energy-sensitive singlephoton X-ray imaging systems. A detailed analysis of synchronous CMOS low-noise image sensors using conventional architectures reveals room for potential noise performance improvements, namely noise in switched-capacitor column-parallel amplifiers as well...