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THE QUARTZ PIEZOELECTRIC EFFECT
A piezoelectric material generates an electric charge when mechanically deformed, conversely, when an external electric field is applied to piezoelectric materials they mechanically deform.

The quartz is a piezoelectric material so it has the ability to measure the mass of the thin films sticked to its surface because the measured resonant frequency depends on the mass material deposided on the quartz crystal surface, this frequency changes accordingly to the well established Sauerbrey equation.

QCM - Quartz Crystal Microbalance

The quartz crystal at the begin and  the quartz crystal coated with a film sensible to the substance to be revealed.

j

The substance to be revealed is put in contact with the treated quartz. It begins an affinity reaction between the analyte to be revealed and the quartz.

n

An increase of the mass on the quartz crystal lead to a frequency falling and a decrease of the mass on the quartz crystal lead to a frequency rising.

 

 

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