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Type of accessories

BluQCM-QMD

QMD-300

General function
Operation modes High Resolution Mode
Sweep mode
Tracking Mode
Sensors technologies
Number of cell modules
Temperature control
QCM, HFF-QCM, LOVE
Up to 4 cell modules
Integrated in the system (Peltier)
Sensor
Frequency range 5 MHz – 160 MHz
Frequency resolution 1 mHz
Frequency stability ± 0.05 ppm, over 0 to 50 °C
Frequency accuracy ± 0.1 Hz
General
Remote control and monitoring interface via ethernet
Measurement in air
Dimensions/cm 32x75x45 (HxWxD)
Weight 25 kg
Catalog n°
 1 channel AW-A20/1
2 channels AW-A20/2
3 channels AW-A20/3
4 channels AW-A20/4

 

QMD-FCU (optional)

General function
Up to 4 flow-through modules
The 4 flow-modules can be operated simultaneously
Standard version of QMD-FCU works simultaneously with QMD-300.
Built-in thermostatic system for temperature control of liquids
Degasser
General
Remote control and monitoring interface via IP
Dimensions/cm 45x75x45 (HxWxD)
Weight 35 kg with complete 4 module configuration
Catalog n°
1 channel AW-F20/1
2 channels AW-F20/2
3 channels AW-F20/3
4 channels AW-F20/4

Acoustic sensing principle

The acoustic sensing principle is based on the precise detection of changes on the properties of an acoustic (mechanical) wave traveling through the bulk (QCM-AWS, HFF-AWS) or the surface (LOVE-AWS) of the acoustic wave sensor.

QCM-AWS sensors consist of a thin piece of quartz confined between a pair of metal-based electrodes. An alternating current applied to the quartz crystal induces mechanical oscillations on the quartz due to the piezoelectric effect. A wave is generated and propagated through the sensor and the films attached to it.
The Quartz crystal microbalance is a mass-sensitive detector based on frequency changes of an oscillating quartz crystal. The oscillation frequency of the crystal
is proportional to the mass of the crystal, as well as solution properties near the surface (including viscosity, density, temperature, and compression waves).

The resonance frequency of this wave depends on the oscillating mass of the sensor and its adhering layers. When a thin film is attached to the sensor, the properties of the wave change as well, modifiying the resonance frequency and amplitude. If the film is thin and rigid, the decrease in frequency is proportional to the mass of the film. In this way, the QCM works in the so-called gravimetric regime and the mass of the film can be calculated using the well-known Sauerbrey equation. If the film is not rigid, the measurement of the damped resonance enables the measurement of the viscoelastic changes of the film, allowing the characterization of the QCM working in the non-gravimetric regime.

A mass increase results in a frequency decrease. Sauerbrey was the first to provided a description and experimental verification of the mass/frequency relationship between foreign layers firmly attached
to the quartz crystal resonator(1)(2).

(1): G. Sauerbrey, Phys. Verh., 1957, 8, 113-114.
(2): G. Sauerbrey, Z. Phys., 1959, 155, 206-222.

The Sauerbrey equation is defined as:

ƒ0: resonant frequency (Hz)
∆ƒ: frequency change (Hz)
∆m: mass change (g)
A: piezoelectrically active crystal area
(area between electrodes, cm²)
ρq: density of quartz (?q = 2.648 g/cm³)
µq: shear modulus of quartz for AT-cut crystal
(µq = 2.947×1011 g/(cm.s²))

 

 

Sensor QCM 14 mm wrapped QCM 1’’ wrapped QCM 1’’ wrapped
Cell
In-batch
eQCM
AW-GBQ01Q (Glove box)
AW-BEQ01Q
AW-GBQ02Q (Glove box)
AW-BEQ02Q
AW-BEQ01HQ
Flow eQCM AW-FEQ01Q AW-FEQ01HQ
Flow
QCM
AW-FQ01Q N/A AW-FQ01HQ
In-batch
QCM
AW-BQ01Q AW-BQ02Q AW-BQ01HQ
In-batch
eQCM
AW-BEQ10Q AW-BEQ11Q AW-BEQ10HQ
Flow eQCM AW-FEQ10Q AW-FEQ10HQ
In-batch probe
eQCM
N/A AW-PEQ10Q
Flow
QCM
AW-FQ10Q AW-FQ11Q AW-FQ11HQ
In-batch
QCM
AW-BQ10Q AW-BQ11Q AW-BQ11HQ

Reference and counter electrodes have to be purchased separately (except for eQCM flow cells where the Pt plate counter electrode is integrated in the lid of the cell).. Compatible counter and reference electrodes are shown in the following table:

Reference electrode Counter
electrode
Aqueous Non-aqueous
In-batch eQCM cells RE-1B
A-012167
RE-7
A-012171
Pt wire 23 cm coiled
A-002234
Flow eQCM cells RE-1S
A-012168
RE-7S
A-012172
Pt disk integrated in the cell lid