Abstract

A device was constructed to monitor viscosity of solutions using fundamental frequency of 9 MHz and 10 MHz quartz crystal. Piezoelectric quartz crystals with gold electrodes were mounted by O-ring in between liquid flow cell. Only one side of the crystal was exposed to the solutions which were pumped through silicon tube by a peristaltic pump. The measured frequency shift was observed in order to investigate the interfacial behavior of some selected solution in contact with one surface of Quartz Crystal Microbalance (QCM). An analysis of the interaction between an AT-cut quartz crystal microbalance and various liquid system of analytical interest is presented. The analysis which includes piezoelectric effects and other influences; liquid properties, experimental conditions and the characteristic of the solution are reported. Oscillation in distilled water is taken as a reference. The frequency change caused by the density (ρ, gcm-3) and viscosity (η gcm-1s-1) were found to be proportional to the square root of the product, (ρ η). The result suggested that analysis of small frequency shifts during EQCM studies needs to account for changes in ρ and η of the solution. Generally, all the liquid tested showed an increment of the frequency shift with increasing content of solutes. For each solution, the frequency was recorded as the concentration increases from distilled water to a very concentrated solution. The frequency measurements carried out for saccharide solution produces the maximum changes of frequency shift compared with other solutions.

Highlights

  • Quartz crystal microbalance (QCM) is a wellestablished method for the measurement of small changes in mass, based on the relationship between changes in mass of material attached to the crystal and the oscillation frequency of the crystal

  • Konash and Bastiaans[3] reported that a crystal with one electrode in contact with an organic solvent oscillates. They found that the frequency depends on the density and the arrangement may be used as a detector for liquid chromatography

  • We found that sucrose gave a higher frequency change compared to glucose and maltose for both 9 and 10 MHz QCM

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Summary

INTRODUCTION

Quartz crystal microbalance (QCM) is a wellestablished method for the measurement of small changes in mass, based on the relationship between changes in mass of material attached to the crystal and the oscillation frequency of the crystal. Konash and Bastiaans[3] reported that a crystal with one electrode in contact with an organic solvent oscillates. They found that the frequency depends on the density and the arrangement may be used as a detector for liquid chromatography. Kanazawa and Gordon[4] presented a quantitative description of the influence of the liquid properties on the oscillation frequency. They determined the behavior of the crystal/fluid system by examining the coupling of the elastic shear waves in the crystal to the viscous shear wave in the liquid. The frequency behavior of the QCM immerse in those solutions is reported in this paper

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