Title

Quartz Crystal Microbalance (Qcm) In High-Pressure Carbon Dioxide (Co 2): Experimental Aspects Of Qcm Theory And Co 2 Adsorption

Abstract

The quartz crystal microbalance (QCM) technique has been developed into a powerful tool for the study of solid-fluid interfaces. This study focuses on the applications of QCM in high-pressure carbon dioxide (CO 2) systems. Frequency responses of six QCM crystals with different electrode materials (silver or gold) and roughness values were determined in helium, nitrogen, and carbon dioxide at 35-40°C and at elevated pressures up to 3200 psi. The goal is to experimentally examine the applicability of the traditional QCM theory in high-pressure systems and determine the adsorption of CO 2 on the metal surfaces. A new QCM calculation approach was formulated to consider the surface roughness contribution to the frequency shift. It was found that the frequency-roughness correlation factor, C r, in the new model was critical to the accurate calculation of mass changes on the crystal surface. Experiments and calculations demonstrated that the adsorption (or condensation) of gaseous and supercritical CO 2 onto the silver and gold surfaces was as high as 3.6 μg cm -2 at 40°C when the CO 2 densities are lower than 0.85 g cm -3. The utilization of QCM crystals with different roughness in determining the adsorption of CO 2 is also discussed.

Publication Date

4-27-2004

Publication Title

Langmuir

Volume

20

Issue

9

Number of Pages

3665-3673

Document Type

Article

DOI Link

https://doi.org/10.1021/la035502f

Socpus ID

2342567099 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/2342567099

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