A Two-Phase Model for Adsorption from Solution Using Quartz Crystal Microbalance with Dissipation
QCMD Theory revision manuscript clean 7_20_22.pdf
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KAUST DepartmentEnergy Resources and Petroleum Engineering, King Abdullah University of Science and Technology, Thuwal 23955−6900 Saudi Arabia
Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
Physical Science and Engineering (PSE) Division
Energy Resources and Petroleum Engineering Program
Embargo End Date2023-08-11
Permanent link to this recordhttp://hdl.handle.net/10754/680253
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AbstractQuartz crystal microbalance with dissipation (QCM-D) conveniently monitors mass and mechanical property changes of thin films on solid substrates with exquisite resolution. QCM-D is frequently used to measure dissolved solute/sol adsorption isotherms and kinetics. Unfortunately, currently available methodologies to interpret QCM-D data treat the adlayer as a homogeneous medium, which does not adequately describe solution-adsorption physics. Tethering of the adsorbate to the solid surface is not explicitly recognized, and the liquid solvent is included in the adsorbate mass, which is especially in error for low coverages. Consequently, the areal mass of adsorbate (i.e., solute adsorption) is overestimated. Further, friction is not considered between the bound adsorbate and the free solvent flowing in the adlayer. To overcome these deficiencies, we develop a two-phase (2P) continuum model that self-consistently determines adsorbate and liquid-solvent contributions and includes friction between the attached adsorbate and flowing liquid solvent. We then compare the proposed 2P model to those of Sauerbrey for a rigid adlayer and Voinova et al. for a viscoelastic-liquid adlayer. Effects of 2P-adlayer properties are examined on QCM-D-measured frequency and dissipation shifts, including adsorbate volume fraction and elasticity, adlayer thickness, and overtone number, thereby guiding data interpretation. We demonstrate that distinguishing between adsorbate adsorption and homogeneous-film adsorption is critical; failing to do so leads to incorrect adlayer mass and physical properties.
CitationBerlinger, S. A., Chen, X., Yutkin, M., & Radke, C. J. (2022). A Two-Phase Model for Adsorption from Solution Using Quartz Crystal Microbalance with Dissipation. Langmuir. https://doi.org/10.1021/acs.langmuir.2c00998
SponsorsWe acknowledge Mr. Harsh Srivastav, Professor Kranthi Mandadapu, and Professor Amaresh Sahu for helpful discussions.
PublisherAmerican Chemical Society (ACS)
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