@ Vahid Forooqi Motlaq

I am not sure what sort of standard you're requiring and the application area of your research. Is it a size, zeta potential, or molecular weight standard you are seeking?

For DLS size, ISO 22412:2017 and ASTM 2490-09(15) recommend a standard in the 100 nm region. Malvern Panalytical uses such sizes (and 60 and 220 nm) but many others can be selected from the ThermoFisher Scientific catalog.

For zeta potential (really mobility) the only primary standard is the NIST SRM 1980 but there's a secondary material obtainable from Malvern Panalytical that's referenced against this primary mobility standard.

For MW there's a bunch of materials again and also a Rayleigh constant material is required and MP provides a sealed tube with an appropriate ultra pure and clean toluene material.

So we need more information as to what you want. Your best bet is to contact your local Malvern Panaytical subsidiary also based in Uppsala. Details follow in the next post.

Malvern Nordic Sweden, Vallongatan 1, Uppsala 752 28, Sweden

Tel: Sales: + 46 (0) 18 55 24 55 Tel: Support: + 46 (0) 18 55 24 55

Fax: + 46 (0) 18 55 11 14

Also go on to the website for more information:

https://www.malvernpanalytical.com/en

https://www.malvernpanalytical.com/en/about-us/contact-us/