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Modified Sauerbrey equation: a facile method to quantitatively probe the conformation of isolated molecules at
Xianbin Du1, Jiajie Fang, Da-Ming Zhu
1State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China. yingfeng@ustc.edu.cn.
The Analyst
|June 9, 2018
Summary
The quartz crystal microbalance (QCM) technique
Area of Science:
- Surface science
- Analytical chemistry
- Physical chemistry
Background:
- Quartz crystal microbalance (QCM) is widely used to monitor solid-liquid interfaces.
- A direct relationship between QCM signal and surface mass is not well-established.
- Understanding interfacial phenomena requires accurate mass determination.
Purpose of the Study:
- To establish a direct relationship between QCM signal and surface mass.
- To elucidate the factors influencing the QCM response at solid-liquid interfaces.
- To develop a modified Sauerbrey equation for accurate interfacial analysis.
Main Methods:
- Investigated the relationship between adsorbed layer viscosity and surface coverage.
- Analyzed the influence of intrinsic viscosity, solvent density, and crystal thickness.
- Developed and applied a modified Sauerbrey equation.
Main Results:
- A proportional relationship between QCM signal and surface mass was found.
- This proportionality is linked to the linear viscosity-coverage relationship and minor viscosity shifts.
- The proportionality coefficient is influenced by intrinsic viscosity, solvent density, and crystal thickness.
Conclusions:
- The modified Sauerbrey equation allows for semi-quantitative description of chain conformations at interfaces.
- Intrinsic viscosity is key, determined by molecular chain conformation or adsorption blobs.
- This work refines QCM analysis for interfacial studies.
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