EQCM

	resolution 0.1 ng
	automatic tests of crystal
	100 measurments p/s
	range 100 ug
	computer interface RS 232C
	analog output
	two analog inputs

The Model M106 Electrochemical Quartz Crystal Microbalance is an extremely sensitive instrument for precision measurement of very small mass changes in the ranges from 1 ng to 100 ug.

Quartz Crystal Microbalance M106 consists of two basic units: Oscillator unit and Central unit. The task of Oscillator unit is to record the frequency changes of quartz crystal, which is coupled with measuring oscillator.

The oscillation frequency changes with any change of mass rigidly attached to the metal electrode (gold or platinum) evaporated on the quartz surface. The frequency change is measured by the instrument and converted to the mass units. The crystal is attached to the bottom of an electrochemical cell using a silicone - rubber. The cell is placed into a holder, which is connected to easily changed insert. In this way fast replacement of the crystal is possible (it takes seconds). One of two electrodes present on opposite faces of the quartz crystal, which has contact with solution, is the working electrode (WE). The instrument uses the AT-cut 10 MHz quartz crystals 14 mm in diameter.

Model M106 EQCM measures changes of frequency using two methods: interval measurements (fast) and classic (one second) method. An internal computer translates interval measurements to frequency and then both values to mass change. Before the start of measurements the instrument performs automatic tests of crystal in order to make the measurements more precisely.

APPLICATIONS:

Adsorption studies
Surface oxidation
Electroplating
Corrosion
Etching
Protective films
Lithium batteries
Drug release

ADDITIONAL POSSIBILITIES:

Compatible with any potentiostat thanks to two measuring channels X and Y with analog to digital conversion.
Compatible with any potentiostat having an analog input and with any analog plotter.
PC remote operation via RS-232 interface.

SPECIFICATIONS:

Fundamental frequency of crystal	10.000 MHz ±10kHz
Range of frequency change	0 - 100 kHz.
Frequency resolution	0,1 Hz
Number of measurements in 1s (for f > 200Hz)	~100
Range of mass change	1ng - 100µg
Mass resolution	0,1 ng
Analog output voltage	0 - 10V
Analog output accuracy	±0,1% of value,±0,1% FS, ±1mV
Analog input voltage X and Y	-10V - +10 V
Analog input accuracy	±1% of value, ±0.5% FS
Power supply	220 V, 50 Hz

ARTICLES

Electrochemical quartz crystal microbalance and spectroelectrochemical studies of the influence of cations on the formation and electroactivity of poly(N-vinylcarbazole) films in acetonitrile solutions.
V. Carlier, M. Skompska, C. Buess-Herman

More informations: meeck@meeck.pl