The impermeability of defect-free graphene to all gases has been recently contested since experimental evidence (see Nature 579, 229–232 (2020)) hydrogen transmission through a two-dimensional carbon layer obtained. By means density functional theory computations here we elucidate flipping mechanism which involves the insertion chemisorbed atom in middle C–C bond via transition state that is re...

Abstract In this paper, we report on an enhanced hydrogen permeation effect along grain boundaries in tungsten. Sputtered nanocolumnar tungsten layers (column lateral dimensions 100–150 nm and layer thickness 2 μm) were analysed by measurements the temperature range 520–705 K. The experiments constitute a direct observation of effect, previously postulated means combination indirect simulations...

Exploring the fundamental mechanisms of hydrogen generation from a lubricated rubbing contact is critical step to mitigate premature failure mechanical elements. This work employs an in-situ uptake technique and molecular dynamics simulations study thermo-mechanical effects on in contacts. The measured AISI 52100 bearing steel at temperature 27 ◦C 85 under applied pressure 140 kPa 350 kPa. Expe...

the aim of the present study was to investigate the influence and the mechanisms of cineoleand terpineol on the in-vitro transdermal delivery of huperzine a from microemulsions, andtheir potential synergistic effect on the permeation enhancement. the transdermal deliveryof huperzine a from microemulsions with different concentrations of cineole and terpineolthrough the rat abdominal skin was de...

Membrane-based separations are an attractive means to separate hydrogen from gas mixtures in order to use hydrogen in energy-related applications. Zeolite membranes are robust materials that are well suited to be used in harsh conditions, but they are not typically selective for hydrogen. Several studies have shown that highly selective separations of hydrogen are possible using zeolite membran...

Hydrogen production from water thermolysis can be enhanced by the use of perovskite-type mixed ionic and electronic conducting (MIEC) membranes, through which oxygen permeation is driven by a chemical potential gradient. In this work, water thermolysis experiments were performed using 0.9 mm thick La0.9Ca0.1FeO3-δ (LCF-91) perovskite membranes at 990 °C in a lab-scale button-cell reactor. We ex...

Hydrogen sulfide (H(2)S) is mainly known for its toxicity but has recently been shown to be produced endogenously in mammalian tissues and to be associated with physiological regulatory functions. To better understand the role of biomembranes in modulating its biological distribution and effects; we measured the partition coefficient of H(2)S in models of biological membranes. The partition coe...