MÁY PHÂN TÍCH THẾ ZETA

Key benefits

• No electro-osmosis → Artifact-free measurements
• Improved LDE technology → Efficient, reliable & simple
• High-resolution measurement → Accurate & repeatable Zeta potential analysis
• High durability electrodes → robustness & cost-effectiveness
• Designed for standard disposable and quartz cuvette → Easy-to-fill, compatible with organic solvents and high-pH suspensions
• Advanced software functionalities (Time, pH, Temperature kinetic modes, SOPs, reporteditor, etc.)
• Easy-to-use and intuitive Graphical User Interface (GUI) software

Technologies & innovations

Dip cell : simple, robust, artifact-free

• Simple and easy sample preparation ; no risk of bubble
• Robust : high durability vitreous carbon electrodes
• Artifact-free : optimized dip cell electrodes design → no electro-osmosis bias
• High resolution measurements : sampling frequency 30 times higher than competitors / significantly improving measurement resolution down to 0,1 mV

Main characteristics

• Zeta potential measurement range: -200mV to +200 mV
• High resolution measurement: better than 0.1 mV
• Dip cell with unique high durability amorphous carbon electrodes
• ZetaQ proprietary software (lien vers onglet ZetaQ)
• Compliant with ISO 13099-2 Colloidal system – methods for Zeta potential determination – Part 2

Zeta potential (ζ)

Is a fundamental property of colloidal suspension related to the effective surface electrical charges of particles immersed in a solvent.

ζ measurement is very important because it gives an indication on formulation stability and electrophoretic properties of NPs. Zeta potential is measured by the well-known technique of Laser Doppler Electrophoresis.

Laser Doppler Electrophoresis principle :

An alternative electrical field/voltage is applied between two electrodes immersed deeply in the colloidal suspension; the charged particles are forced into a translation motion (electrophoresis) with a speed (ν) proportional to the applied electrical field. The electrophoretic mobility is defined by the ratio between the particle speed and the applied field amplitude.

Specifications:

Specifications
Zeta potential range	-500 mV to 500 mV
Mobility range	10-10 to 10-7 m2/V.s
Particle size (For zeta measurement)	1 nm up to 100 µm
Sample concentration	0.0001% to 10% w/% (solvent dependent)
Temperature control range inside the cell	10°C to 70°C +/-0,1°C (depending on cuvette cell material)
Cell options	Cuvette cell with optical quality windows compatible with organic solvents
Sample volume	Typically 750 µL (Hellma cell – 10 mm light path)
Maximum sample conductivity	300 mS/cm
Sample Type	Aqueous & organic solvents – pH: 1-14 (depending on cuvette cell material)
Signal processing
Measurement technology	Laser Doppler Electrophoresis (LDE)
Laser source	Highly reliable 20 mW diode @635 nm coupled to automated optical attenuation system. Other wavelengths available upon request
Measurement angle	Single angle for Zeta potential at 17°
Data processing algorithm	Fast Fourier Transform
Resolution	Mobility = 10-10 m2/V.s or Zeta = 0,1 mV ( in water)
Detector	Avalanche Photodiode – APD
General
Computer interface	USB 2.0 – Windows XP, Seven
Dimensions	33 cm x 33 cm x 38 cm (HWD)
Weight	16 kg
Power	100-115/220-240 VAC, 50/60 Hz, 100 W max
System Compliance
CE certification	ISO 13099-2 : 2012 – Colloidal system – methods for zeta-potential determination – Part 2 : Optical methods