The mirage effect to probe the adsorption of organic molecules on the surface of the mass standards

Taillade, F.; Silva, M. Z.; Lepoutre, F.; Lecollinet, M.; Pinot, P.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1873
Academic Journal
Among all the basic SI units, the mass unit is the only one to be defined in terms of a material standard: a prototype called K. All the industrial countries possess their own standards which were compared to the K during the last international comparison showing that unknown evolution occurs, but the adsorption-desorption of cleaning products plays a relatively important role. A few years ago, several laboratories in the U.S.A., Germany, and France reported interesting results of photothermal measurements to detect desorption at normal temperature and pressure (NTP). This paper presents a mirage set-up built to detect the film of condensable gasses on metallic surfaces at NTP conditions. In order to quantify these measurements, an inverse method has been developed to determine the adsorption isotherm involved in the physical process of adsorption-desorption and the linked parameters such as absorbability, type of adsorption, and differential heat of adsorption. The results will be discussed to imagine possible tracks to reduce the instabilities of the standards in the future and for possible new definitions of standards built with silicon. © 2000 American Institute of Physics.


Related Articles

  • The adsorption of simple particles on a 2×N lattice space. Hock, J. L.; McQuistan, R. B. // Journal of Mathematical Physics;Sep85, Vol. 26 Issue 9, p2392 

    Utilizing a 15-term recursion relation that describes exactly the composite nearest neighbor degeneracy for simple indistinguishable particles on a 2×N lattice, the adsorption isotherm is calculated and it is shown analytically that coverage as a function of the gas phase pressure exhibits...

  • Influence of Correction Values on Sorption Parameters:Case of Lead. Diatta, J.B. // Polish Journal of Environmental Studies;2002, Vol. 11 Issue 3, p237 

    Three adsorption equations were applied to verify the influence of correction values (CF) on adsorption parameters calculated using Langmuir, Freundlich and Gunary isotherms. It was found that the inclusion or not of the correction values into the -Langmuir equation did not yield appreciable...

  • Phase transitions at liquid–solid interfaces: Padé approximant for adsorption isotherms and voltammograms. Blum, L.; Huckaby, Dale A. // Journal of Chemical Physics;5/15/1991, Vol. 94 Issue 10, p6887 

    A Padé approximant that is the natural extension of Langmuir’s adsorption isotherm is used to study the adsorption in the liquid–solid interface. The coefficients of this approximant are generated by a recursion relation and can be computed from the fugacity series in closed...

  • Monte Carlo simulation of the adsorption of diblock copolymers from a nonselective solvent. I. Adsorption kinetics and adsorption isotherms. Zhan, Yongjian; Mattice, Wayne L.; Napper, Donald H. // Journal of Chemical Physics;5/1/1993, Vol. 98 Issue 9, p7502 

    The adsorption of diblock copolymers from a nonselective solvent onto a surface that attracts one of the two blocks has been simulated on a cubic lattice. The simulation uses periodic boundary conditions in two directions and places the surface at the edges of the box in the third direction. The...

  • Monte Carlo simulation for the adsorption of diblock copolymers. I. In nonselective solvent. Chen, Ting; Liu, Honglai; Hu, Ying // Journal of Chemical Physics;4/1/2001, Vol. 114 Issue 13 

    Extensive Monte Carlo simulations have been performed to study the adsorption of diblock copolymers from a nonselective solvent on an impenetrable surface. The efforts were concentrated on depicting the microstructure of adsorption layers. In simulations, diblock copolymer molecules are modeled...

  • Induced infrared absorption of oxygen physisorbed on NaCl films. Dai, David J. // Journal of Chemical Physics;4/22/1996, Vol. 104 Issue 16, p6338 

    The fundamental induced infrared absorption of O2 physisorbed on annealed NaCl films is observed for the first time. Analysis of spectroscopic and thermodynamic data is consistent with molecules adsorption on defect sites and on Na+, Cl-, and the center of lattice square of smooth NaCl(100)...

  • The structure and adsorption of the four bonding sites model for associating fluids in.... Kovalenko, Andriy; Pizio, Orest // Journal of Chemical Physics;5/22/1998, Vol. 108 Issue 20, p8651 

    Examines the structure and adsorption of the four bonding sites model for associating fluids in disordered porous media. Use of replica Ornstein-Zernike equations to study the quenched fluid systems; Calculation for the adsorption isotherms; Relationship between coexistence envelope and matrix...

  • A new determination method of absolute adsorption isotherm of supercritical gases under high pressure with a special relevance to density-functional theory study. Murata, Katsuyuki; El-Merraoui, Mustapha; Kaneko, Katsumi // Journal of Chemical Physics;3/1/2001, Vol. 114 Issue 9 

    A new determination method of an absolute adsorbed amount n[sub ab] from the surface excess mass n[sub ex] for high-pressure adsorption isotherms of a supercritical gas was proposed. The effectiveness of new method was examined by using the density-functional theory (DFT). The DFT study showed...

  • Adsorption properties of synthetic piceatannol. Polunin, K.; Kolotilov, P.; Dzardanov, D.; Larin, A.; Polunina, I. // Protection of Metals;Nov2008, Vol. 44 Issue 6, p561 

    The adsorption isotherms of synthetic piceatannol ( trans-3,5,3',4'-tetrahydroxystilbene) from n-hexane-ethyl acetate at nanodispersed silicon, titanium, and aluminum oxides were measured under static conditions. The adsorption properties of piceatannol and other hydroxystilbenes were compared...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics