Zetasizer Nano Z/ZS/ZS90 Specifications Zeta Potential Maximum Concentration Limit 40% w/v

This technical note contains details of the procedures and results from measurements of a 40% polyurethane dispersion as demonstration of this maximum concentration specification for zeta potential using the Zetasizer Nano Z, ZS or ZS90

Introduction

For the Zetasizer Nano Z, ZS or ZS90 instrument, the maximum concentration specification for zeta potential measurements is 40% w/v.

Introduction

This technical note contains details of the experimental procedures and results obtained from measurements of a 40% polyurethane dispersion as demonstration of this maximum concentration specification for zeta potential measurements.

Experimental

Materials

  • 40% polyurethane dispersion from Baxenden, a Chemtura company
  • 5% v/v triethylamine for preparation of various concentrations of the polyurethane dispersion
  • High concentration zeta potential cell (ZEN1010)

Method

Various concentrations of the polyurethane dispersion were prepared in 5% v/v triethylamine (to maintain ionic strength). All samples were measured on a Zetasizer Nano ZS at 25oC using the high concentration zeta potential cell ZEN1010. A field of 40V was applied across the electrode spacing of 16mm (field strength of 25V/cm). 

Figure 1: Zeta potential values (mV) calculated as a function of sample concentration (% w/v) using the viscosity of water for all samples
MRK1766 fig 1
Figure 2: Phase plots obtained for repeat measurements of the 40% polyurethane dispersion
MRK1766 fig 2

Results

Figure 1 shows a plot of zeta potential as a function of concentration for an aqueous polyurethane dispersion with the addition of 5% triethylamine. The concentration dependence seen in the zeta potential results is discussed in reference 1.

Figure 2 shows the phase plots obtained from a 40% w/v polyurethane dispersion. These results demonstrate the ability of the Zetasizer Nano to measure samples up to 40%w/v concentration.

Conclusions

The results reported in this technical note confirm that the maximum concentration capability for zeta potential measurements with the Zetasizer Nano Z, ZS or ZS90 is 40% w/v.

Reference

[1] M. Kaszuba, J. Corbett, F.M Watson and A. Jones (2010) Phil. Trans. R. Soc. A368, 4439-4451.

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