I am having trouble in explaning results zeta size have only one peak at 139.7 nm with 100% intensity then why zeta average size is 166nm if 139.7 is with 100% intensity with s.d 32..
In zeta potential there are three peaks firt at -2.50 mV with 83 % area st d. 7.9 mV
second peak 55.5 mV with 6.7% area and s.d 6.4 mV
third peak at 27mV with 5% area and s.d 4.8 mV
then how average zeta potential is -0.66mV ???
How to explain these results ???
I assume you've verified the performance of the system with (size) a 100 nm latex and (zeta) the zeta potential transfer standard. The z-average is a mean value so if you have some material outside your selected range then this will contribute to the overall result. If you have a Malvern Zetasizer then you'll have a quality report. What did this say? Are you using plastic cuvettes.Multiple peaks in the zeta spectrum are highly unusual and need questioning. What is the system you are measuring? Are you measuring in DI water not the mother liquor? Zeta potential measurements require conductivity in the continuous phase.
Again with a Malvern, contact your local partner or post your raw data file (not the result) here or email to me. Why are you using multiple question marks?
Thanx alan yes im using plastic cuettes and yes i have malvern zeta sizer instrument and yes im using distilled water making the disperion of silver nanoparticles in distilled water.
Zetasizer Ver. 7.11
And sorry sir for multiple question marks
For the first question: it is not the "zeta average size". It is "z-average". Nothing to do with zeta. The z-average size is weighted by light intensity and is always larger than the weight-average size, unless the particles are all identical. This is explained in the manual and online help!
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