Micro-carbon-based membrane

Esquivel et al. (2010) present an all-polymer micro-DMFC fabricated with a SU-8 photoresistor. This development exploits the capability of SU-8 components to bond to each other by a hot-pressing process and obtain a compact device. The device is formed by a MEA sandwiched between two current collectors. The MEA consists of a porous SU-8 membrane filled with a proton-exchange polymer and covered by a thin layer of carbon-based electrodes with a low catalyst loading (1.0 mg/cm ). The current collectors consist of two metalhzed SU-8 plates provided with a grid of through-holes that make it possible to deliver the reactants to the MEA by diffusion. The components were then bonded to obtain a compact micro-DMFC. With this assembly, using a 4 M methanol concentration at a temperature of 40°C, a maximum power density of 4.15 mW/cm was obtained. 

Next, I turn to work on water confined in porous media of carbon-based materials. Bardenhagen and co-workers studied fluid distribution and pore wettability for water and dimethylsufoxide in carbon xerogels. They used H relaxation measurements and related the results to the liquid exchange between micro- and mesopores. Wakai et reported a study of the hydration process of a nafion membrane by H... 

Carbon dioxide in acidified blood samples is transferred through a hydrophobic micro-porous membrane and dissolved in an acceptor stream of basic buffer solution containing an acid-base indicator. The absorbance change is measured by spectrophotometry. 

---