Publications de Muhamed Niklaus

Electrical conductivity and Young's modulus of flexible nanocomposites made by metal ion implantation of Polydimethylsiloxane: the relationship between nanostructure and macroscopic properties

The mechanical and electrical properties of nanocomposites created by gold and titanium implantation into Polydimethysiloxane (PDMS) are reported for doses from 1015 at/cm2 to 5x1016 at/cm2, and for ion energies of 2.5 keV, 5 keV and 10 keV. TEM cross-sect ...

Elsevier2011

Array of lenses with individually tunable focal-length based on transparent ion-implanted EAPs

Samuel Rosset, Muhamed Niklaus, Herbert Shea

We report on the fabrication and characterization of 2x2 arrays of mm-diameter PDMS lenses whose focal length can be electrically tuned. Dielectric elastomer actuators generally rely on carbon powder or carbon grease electrodes, which are not transparent, ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2010

3-dimensional electrode patterning within a microfluidic channel using metal ion implantation

Samuel Rosset, Muhamed Niklaus, Herbert Shea, Demetri Psaltis, Jae-Woo Choi, James Adleman

The application of electrical fields within a microfluidic channel enables many forms of manipulation necessary for lab-on-a-chip devices. Patterning electrodes inside the microfluidic channel generally requires multi-step optical lithography. Here, we uti ...

Royal Society of Chemistry2010

Metal-Ion Implanted Elastomers : Analysis of Microstructures and Characterization and Modeling of Electrical and Mechanical Properties

Muhamed Niklaus

This thesis reports on the microstructural analysis of metal ion implanted Polydimethylsiloxane (PDMS), and on the characterization and modeling of its electrical and mechanical properties. Low energy (below 35 keV) metal ion implantation into PDMS forms m ...

EPFL2010

Large-Stroke Dielectric Elastomer Actuators With Ion- Implanted Electrodes

Samuel Rosset, Muhamed Niklaus, Herbert Shea

In this paper, we present miniaturized polydimethyl- siloxane (PDMS)-based diaphragm dielectric elastomer actuators capable of out-of-plane displacement up to 25% of their diameter. This very large percentage displacement is made possible by the use of com ...

Institute of Electrical and Electronics Engineers2009

Metal Ion Implanted Compliant Electrodes in Dielectric Electroactive Polymer (EAP) Membranes

Samuel Rosset, Muhamed Niklaus, Herbert Shea

One of the key factors to obtain large displacements and high efficiency with dielectric electroactive polymer (DEAPs) actuators is to have compliant electrodes. Attempts to scale DEAPs down to the mm or micrometer range have encountered major difficulties ...

Trans Tech Publications Ltd2009

Ion-implanted compliant electrodes used in dielectric electroactive polymer actuators with large displacement

Samuel Rosset, Muhamed Niklaus, Herbert Shea

Metal ion implantation is shown here as an effective technique to fabricate highly compliant electrodes at room temperature on polymer substrates. By implanting 5 keV gold ions in polydimethylsiloxane we have fabricated micron-scale electrodes that conduct ...

Elsevier Science, Reg Sales Off, Customer Support Dept, 655 Ave Of The Americas, New York, Ny 10010 Usa2009

Metal Ion Implantation for the Fabrication of Stretchable Electrodes on Elastomers

Samuel Rosset, Muhamed Niklaus, Herbert Shea

We report on low-energy metal ion implantation by filtered cathodic vacuum arc to create highly deformable electrodes on polydimethylsiloxane (PDMS) membranes. Implantation leads to the creation of nanometer-size clusters in the first 50 nm below the surfa ...

Wiley-Blackwell2009

Voltage control of the resonance frequency of dielectric electroactive polymer (DEAP) membranes

Samuel Rosset, Muhamed Niklaus, Herbert Shea

We report on the characterization, active tuning and modeling of the first mode resonance frequency of dielectric electroactive polymer (DEAP) membranes. Unlike other resonance frequency tuning techniques, the tuning procedure presented here requires no ex ...

Institute of Electrical and Electronics Engineers2008

Microstructure of 5 keV gold-implanted polydimethylsiloxane

Samuel Rosset, Muhamed Niklaus, Herbert Shea

The first high-resolution transmission electron microscopy (TEM) cross-section images of flexible electrodes fabricated by gold ion implantation at 5 keV into polydimethylsiloxane (PDMS) are presented. A TEM sample preparation method based on cryoultramicr ...

Elsevier2008

Ion-implanted compliant and patternable electrodes for miniaturized dielectric elastomer actuators

Samuel Rosset, Muhamed Niklaus, Herbert Shea

This article presents metal ion implantation as an alternative technique to fabricate compliant electrodes for small-size dielectric elastomer actuators. When reducing the size of these actuators to below 1 cm, the ability to pattern the electrodes is adde ...

2008

Modification of Conductivity and of Mechanical Properties of Electroactive Polymer (EAP) Thin Films by Titanium Ion Implantation

Samuel Rosset, Muhamed Niklaus, Herbert Shea

We present a study of the influence on Young s modulus, stress and electrical conductivity of poly-dimethylsiloxane membranes implanted with titanium ions at energies from 5 to 35 keV, with doses up to 8x10^16 ions/cm2. The motivation for this study was to ...

Materials Research Society2008

Mechanical characterization of a dielectric elastomer microactuator with ion-implanted electrodes

Samuel Rosset, Muhamed Niklaus, Herbert Shea

We report on the mechanical characterization and modeling of a non-prestretched dielectric elastomer diaphragm microactuator with ion-implanted electrodes under the influence of a distributed load (pressure). Thin polydimethysiloxane (PDMS) membranes (30 u ...

2008