Nanoparticles size measurement – TEM

According to the current definition provided by the European Commission in the REACH Regulations No. 1907/2006 and CLP 1272/2008, nanomaterials are materials in a free or aggregate state, where more than 50% of the particles have one external dimension in the size range from 1 to 100 nm.
The first problem scientists face when measuring a size is the choice of method. The factors influencing the decision are the price of the test, repeatability and data that can be obtained from a specific apparatus. It is important to capture the actual size of the particles themselves and not of their agglomerates. Such possibilities are possessed by SEM and TEM techniques. DLS is also a popularized measurement technique, but despite its advantages such as measurement efficiency and low price, it does not distinguish the shape of the tested material and brings it closer to a uniform sphere. In other words, it measures the hydraulic size of the particle agglomerate.
Wion Technology obtains images of produced iron (II, III) oxide nanoparticles using the Tecnai TF 20 X-TWIN (FEI) Transmission Electron Microscope (STEM). We provide photos in the product analysis sheets. The photo shows an agglomerate of IONSOL12W particles. Darker fields indicate a higher concentration of particles in these places.

Feel free to download TDS of IONSOL products. Free samples are available to conduct your research.