GOMEA: A Conceptual Design of a Membrane Electrode Assembly for a Proton Exchange Membrane Electrolyzer.

We are proposing a conceptual membrane electrode assembly (MEA) of a proton exchange membrane water electrolyzer that includes a layer of graphene oxide (GO) at the cathode side. This GO layer primarily reinforces the MEA to allow operation at a higher pressure difference between the cathode and anode side. Additional benefits would be that a perfect GO layer would prevent both water and hydrogen crossover and thus would allow for pure, dry hydrogen escaping directly from the electrolyzer without losses due to hydrogen crossover, thus eliminating the need for hydrogen clean-up steps.

A study on the influence of ligand variation on formamidinate complexes of yttrium: new precursors for atomic layer deposition of yttrium oxide.

The synthesis and characterization of a series of closely related Y(III) compounds comprising the formamidinate ligands (RNCHNR) (R = alkyl) is reported, with the scope of using them as prospective precursors for atomic layer deposition (ALD) of yttrium oxide (YO) thin films. The influence of the side chain variation on the thermal properties of the resulting complexes is studied and benchmarked by thermal analysis and vapor pressure measurements. Density functional theory (DFT) studies give theoretical insights into the reactivity of the compounds towards water, which was targeted as a co-reactant for the deposition of YO thermal ALD in the next step.

Atomic layer deposition of dielectric YO thin films from a homoleptic yttrium formamidinate precursor and water.

We report the application of tris(,'-diisopropyl-formamidinato)yttrium(iii) [Y(DPfAMD)] as a promising precursor in a water-assisted thermal atomic layer deposition (ALD) process for the fabrication of high quality YO thin films in a wide temperature range of 150 °C to 325 °C. This precursor exhibits distinct advantages such as improved chemical and thermal stability over the existing YO ALD precursors including the homoleptic and closely related yttrium tris-amidinate [Y(DPAMD)] and tris-guanidinate [Y(DPDMG)], leading to excellent thin film characteristics. Smooth, homogeneous, and polycrystalline (fcc) YO thin films were deposited at 300 °C with a growth rate of 1.

[Ultrasonic findings in aggressive abdominal fibromatosis].

A case of aggressive abdominal fibromatosis is reported. Ultrasonography revealed multiple inhomogenous, hypoechoic tumours within the mesenterium and the anterior abdominal wall. Some of these lesions had a hyperechogenic margin.