USE OF MIRAGE EFFECT FOR THE DETECTION OF ADSORPTION OF ORGANIC MOLECULES ON THE SURFACE Pt – 10% Ir ALLOY OF MASS STANDARD

Riadh Hannachi, Zaccaria Silvestri, Daniel du Colombier, Patrick Pinot

Abstract

One among factors responsible of the instability of mass standard is the adsorption and desorption induced by the cleaning products. An optical non-contact method based on mirage effect is proposed to investigate the adsorption/desorption of cleaning solvents on the surface of mass standards at conditions close to normal temperature and pressure (NTP). A model developed for the mirage effect when physical adsorption occurs on a non-porous sample under NTP conditions is recalled. The experimental results of the mirage deflection obtained, in the case of platinum iridium alloy with ethanol
itrogen and ether
itrogen mixture, and the relation between the phase of the mirage deflection and the adsorption isotherm allow the measurement of the parameters characterizing the adsorption process, such as the amount of adsorbed matter in the first monolayer.

Keywords

mirage effect, adsorption

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IMEKO-WC-2009-TC3-409.pdf

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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