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SZ Particle Size Analyser

Nano particle analyser

Product Category: Particle Size Analysis

Industry: Life Sciences, Particle and surface science

Supplier: Horiba


The SZ-100 nanopartica series instruments are flexible analytical tools for characterizing the physical properties of small particles. Depending on the configuration and application the system can be used as a particle size analyzer, or also used to measure zeta potential, molecular weight, (MW) and second virial coefficient (A2). Typical applications for the SZ-100 include nanoparticles, colloids, emulsions, and submicron suspensions.

Particle size analysis is performed by dynamic light scattering (DLS). Depending on the physical properties of the sample, the dynamic range is 0.3 nm – 8 µm. The lower limit is influenced by concentration, how strongly the sample scatters light, and the presence of large, unwanted particles. The upper limit is influenced by the density of the sample since DLS is modeled on all motion coming from Brownian motion, not gravitational settling.

The charge on the surface of particles is characterized by the SZ-100 by measuring the zeta potential of a suspension. The sample is injected into a disposable cell and a measurement of the particle electrophoretic mobility results in the calculated zeta potential. The zeta potential of the sample is most often used as an indicator of dispersion stability. Large magnitude zeta potential values indicate that an electrostatically stabilized suspension will remain stable.  The zeta potential is often measured as a function of pH or other change in the chemistry to help formulators create new products with a long shelf life.  Conversely identifying conditions at which the zeta potential is zero (that is, the sample is at the isoelectric point) allows one to choose optimum conditions for flocculating and separating particles.

The same instrument can also be used to measure the molecular weight and second virial coefficient of proteins, polymers, and other molecules. The user prepares several solutions with known concentrations and then uses the system in a static light scattering mode to create a Debye plot, which results in a calculation of both MW and A2.


  • Particle size, zeta potential, molecular weight, and second virial coefficient all in one instrument
  • Wide range of particle sizes and concentrations
  • Particles size measurements at both 90° and 173°
  • Multiple particle size measurement modes for working with small particles and weak scatterers
  • Small volume cells for both particle size and zeta potential
  • Optional pH controller for automatic titration of zeta potential vs.pH


Particle size: Dynamic Light Scattering (DLS) technique

Measurement range

  • Particle diameter: 0.3nm-8.0μm

Measurement Accuracy

  • Particle size: ISO 13321/22412 compliant.
  • NIST traceable polystyrene latex particle standard: 100nm measurement accuracy = +/- 2%


  • Lower limit of 0.1 mg/mL of lysozyme
  • Upper limit of 40 wt %, depending on sample

Measurement time

  • Approx. 2 minutes in general for particle size analysis

Sampling cell

  •  Cuvette cell

Sampling volume

  • 12μ 4ml* (* The sampling volume depends on the cell volume capacity.)

Zeta potential: Laser doppler electrophoresis technique

Measurement range

  • -200 – +200mV

Measurement time

  • Approx. 2 minutes in general

Sampling cell

  •  Dedicated disposable cell or dip cell 

Sampling volume

  • ~100μl for disposable cell

Molecular weight: Static light scattering Debye plot technique

Measurement Range

  •  Mw: 1×10- 2×107 g/mol

Sampling cell

  •  Cuvette cell


Power supply: AC 100-240V, 50/60Hz, 150VA

Laser: DPSS 532 nm, 10 mW Class I

Interface: USB 2.0, between the analyzer and PC

External dimensions: 385(D) ´ 528(W) ´ 273(H) mm (Except for projections)

Mass approx: 25kg

Temp control range: 1-90 for particle size, 1-70 for zeta potential

Operating temp and humidity: 15-35, Relative humidity = 85% or less, no condensation

Condensation control: Purge port connection available


Scientific Solutions

Scientific Solutions have been providing carefully selected laboratory and analytical equipment to Australian Industries such as Environmental, Pharmaceutical, Food and Beverage and Research markets of the Science Industry for over a decade.

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