A light-addressable potentiometric sensor (LAPS) is a semiconductor-based chemical sensor, in which the measurement area defined by probe light illuminating plate. In this study, novel method to detect hydrogen permeation through metal was proposed using system, LAPS combined with micro-volume cell. The sensing surface of placed vicinity exit an iron sheet form cell filled Na2HPO4 solution, and...

Hydrogen permeation into high-strength steel during the corrosion process can deteriorate their mechanical properties, thus seriously threatening safety of structures. However, hydrogen behavior steels in corrosive marine environments is not well understood. In this study, and mechanism AISI 4135 different zones was investigated for first time using an situ monitoring system via outdoor indoor ...

The use of organic polymeric membranes to separate gaseous mixtures provides an attractive alternative to other methods such as selective adsorption and cryogenic distillation. The primary advantages of membrane-based separations are their relative energy efficiency and lower costs. Because the flux of a gas across a membrane is inversely proportional to the membrane's thickness, this method re...

The kinetic Monte Carlo reaction-path-following technique is applied to determine the lowest-energy water pathway and the coordinating amino acids in bAQP1 and GlpF channels, both treated as rigid. In bAQP1, water molecules pass through the pore between the asparagine-proline-alanine (NPA) and selectivity filter (SF) sites one at a time. The water chain is interrupted at the SF where one water ...

This paper presents wafer-scale palladium silver alloy membranes, fabricated with a sequence of wellknown thin film and silicon micromachining techniques. The membranes have been tested in a gas permeation system to determine the hydrogen permeability and hydrogen selectivity. Typical flow rates of 1 mol H2 /m.s have been measured with a minimal selectivity of 1500 for H2/He. The membranes have...

Swift heavy ion irradiation produces damage in polymers in the form of latent tracks. Latent tracks can be enlarged by etching it in a suitable etchant and thus nuclear track etch membrane can be formed for gas permeation / purification in particular for hydrogen where the molecular size is very small. By applying suitable and controlled etching conditions well defined tracks can be formed for ...

The effects of temperature and chloride deposition on hydrogen absorption into steel were evaluated during wet/dry cyclic corrosion using a temperature-compensated monitoring system based the electrochemical permeation method. Hydrogen was detected through measurement currents wet periods under corrosion. enhancement mainly caused by changes in solution chemistry wetting drying periods, with de...

The oxygen reduction reaction (ORR) under ultrathin electrolyte layers is a key in many processes, from atmospheric corrosion to energy conversion fuel cells. However, the ORR current difficult measure using conventional electrochemical methods. Hence, reliable data are scarce for micrometer range and totally missing sub-micrometer of layer thickness. Here, we report novel hydrogen-permeation-b...