HESEB The Helmholtz state of the art Soft X Ray Undulator beamline at SESAME

SESAME and a consortium of five Helmholtz Centers are designing and installing a state of the art soft X Ray undulator beamline at the SESAME light source in Amman, Jordan. Funding is provided by the Helmholtz Association over a four year project cycle that started in January 2019. This is an interim report covering the first 36 months of the project where the construction and installation has been almost completed and commissioning and characterization of the beamline is about to start. Additionally, seminars, workshops, and a training program are part of the project aimed at establishing a broad user communit

Replica molding for multilevel micro nanostructure replication

The development of micro and nanofabrication processes with the capability to achieve three dimensional structures is of great interest for a wide variety of applications. In this paper, a replica molding process for the replication of combined micro and nanostructures in an epoxy based photo resin is reported. First, multilevel masters were realized using standard micro and nanofabrication processes. The structures from these masters were transferred to poly dimethylsiloxane PDMS stamps by soft lithography. Finally, the PDMS stamps were used for the replication of nano and microstructures in the epoxy based resin by UV casting. With this process, micro and nanostructures of minimal dimensions of 50 nm were successfully replicated. Furthermore, the capabilities of the process were confirmed by the fabrication of a microfluidic device. In this system, the surface of micro channels was structured to modify its wetting properties and create hydrophobic and hydrophilic areas without any additional chemical treatmen

Towards a compact SU 8 micro direct methanol fuell cell

This paperpresentsanall polymermicro directmethanolfuelcell microDMFC fabricatedwithSU 8 photoresist.ThepresentdevelopmentexploitsthecapabilityofSU 8componentstobondtoeach other byahot pressingprocessandobtainacompactdevice.Thedeviceisformedbyamembrane electrode assembly MEA sandwichedbetweentwocurrentcollectors.TheMEAconsistsofaporous SU 8 membranefilledwithaprotonexchangepolymerandcoveredbyathinlayerofcarbon based electrodes withalowcatalystloading 1.0mgcm amp; 8722;2 . Thecurrentcollectorsconsistoftwometalized SU 8 platesprovidedwithagridofthrough holesthatallowdeliveringthereactantstotheMEAby diffusion. Fuelcellcharacterizationwasperformedbymeasuringthepolarizationcurvesunderdifferent methanol concentrationsandtemperatures.Thecomponentswerefirsttestedusinganexternalcasing. A maximumpowerdensityof4.15mWcm amp; 8722;2 was measuredwiththisassemblyworkingwitha4M methanol concentrationandatatemperatureof40 amp; 9702;C. Thecomponentswerethenbondedtoobtaina compact micro directmethanolfuelcellthatyieldedapowerdensityof0.65mWcm amp; 8722;2 under thesame conditions. Despitethisdecreaseinpowerdensityafterbonding,thedrasticreductionofthedevice dimensions resultedinanincreaseofmorethan50timesthepreviousvolumetricpowerdensity.The results obtainedvalidatethisnovelapproachtoanall polymermicro fuelcell. 2010 Elsevier B.V. All rights reserve