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Intermethod comparison of the particle size distributions of colloidal silica nanoparticles

Jani Tuoriniemi ; Ann-Catrin J. H. Johnsson ; Jenny Perez-Holmberg ; Stefan Gustafsson (Institutionen för teknisk fysik, Eva Olsson Group ; SuMo Biomaterials) ; Julian A. Gallego-Urrea ; Eva Olsson (Institutionen för teknisk fysik, Eva Olsson Group ) ; Jan B. C. Pettersson ; Martin Hassellöv
Science and Technology of Advanced Materials (1468-6996). Vol. 15 (2014), 3, p. artikel 035009.
[Artikel, refereegranskad vetenskaplig]

There can be a large variation in the measured diameter of nanoparticles depending on which method is used. In this work, we have strived to accurately determine the mean particle diameter of 3040 nm colloidal silica particles by using six different techniques. A quantitative agreement between the particle size distributions was obtained by scanning electron microscopy (SEM), and electrospray-scanning mobility particle sizer (ES SMPS). However, transmission electron microscopy gave a distribution shifted to smaller sizes. After confirming that the magnification calibration was consistent, this was attributed to sample preparation artifacts. The hydrodynamic diameter, d(h), was determined by dynamic light scattering (DLS) both in batch mode, and hyphenated with sedimentation field flow fractionation. Surprisingly the dh were smaller than the SEM, and ES SMPS diameters. A plausible explanation for the smaller sizes found with DLS is that a permeable gel layer forms on the particle surface. Results from nanoparticle tracking analysis were strongly biased towards larger diameters, most likely because the silica particles provide low refractive index contrast. Calculations confirmed that the sensitivity is, depending on the shape of the laser beam, strongly size dependent for particles with diameters close to the visualization limit.

Nyckelord: particle morphology, gel layer, surface properties, validation, method comparison, particle diameter



Denna post skapades 2014-08-28. Senast ändrad 2016-03-21.
CPL Pubid: 202081

 

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Institutioner (Chalmers)

Institutionen för kemi och molekylärbiologi (GU)
Institutionen för teknisk fysik, Eva Olsson Group (2012-2015)
SuMo Biomaterials

Ämnesområden

Analytisk kemi

Chalmers infrastruktur