Publikation: Quantitative analysis of polymer colloids by cryo-transmission electron microscopy
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The structure of colloidal latex particles in dilute suspension at room temperature is investigated by cryogenic transmission electron microscopy (cryo-TEM). Two types of particles are analyzed: (i) core particles made of polystyrene with a thin layer of poly(N-isopropylacrylamide) (PNIPAM) and (ii) core-shell particles consisting of core particles onto which a network of cross-linked PNIPAM is affixed. Both systems are also studied by small-angle X-ray scattering (SAXS). The radial density profile of both types of particles have been derived from the cryo-TEM micrographs by image processing and compared to the results obtained by SAXS. Full agreement is found for the core particles. There is a discrepancy between the two methods in case of the core-shell particles. The discrepancy is due to the buckling of the network affixed to the surface. The buckling is clearly visible in the cryo-TEM pictures. The overall dimensions derived from cryo-TEM agree well with the hydrodynamic radius of the particles. The comparison of these data with the analysis bySAXSshows thatSAXSis only sensitive to the average radial structure as expected. All data show that cryo-TEMmicrographs can be evaluated to yield quantitative information about the structure of colloidal particles.
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CRASSOUS, Jérôme J., Christophe N. ROCHETTE, Alexander WITTEMANN, Marc SCHRINNER, Matthias BALLAUFF, Markus DRECHSLER, 2009. Quantitative analysis of polymer colloids by cryo-transmission electron microscopy. In: Langmuir. 2009, 25(14), pp. 7862-7871. ISSN 0743-7463. Available under: doi: 10.1021/la900442xBibTex
@article{Crassous2009-07-21Quant-20187,
year={2009},
doi={10.1021/la900442x},
title={Quantitative analysis of polymer colloids by cryo-transmission electron microscopy},
number={14},
volume={25},
issn={0743-7463},
journal={Langmuir},
pages={7862--7871},
author={Crassous, Jérôme J. and Rochette, Christophe N. and Wittemann, Alexander and Schrinner, Marc and Ballauff, Matthias and Drechsler, Markus}
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<dcterms:abstract xml:lang="eng">The structure of colloidal latex particles in dilute suspension at room temperature is investigated by cryogenic transmission electron microscopy (cryo-TEM). Two types of particles are analyzed: (i) core particles made of polystyrene with a thin layer of poly(N-isopropylacrylamide) (PNIPAM) and (ii) core-shell particles consisting of core particles onto which a network of cross-linked PNIPAM is affixed. Both systems are also studied by small-angle X-ray scattering (SAXS). The radial density profile of both types of particles have been derived from the cryo-TEM micrographs by image processing and compared to the results obtained by SAXS. Full agreement is found for the core particles. There is a discrepancy between the two methods in case of the core-shell particles. The discrepancy is due to the buckling of the network affixed to the surface. The buckling is clearly visible in the cryo-TEM pictures. The overall dimensions derived from cryo-TEM agree well with the hydrodynamic radius of the particles. The comparison of these data with the analysis bySAXSshows thatSAXSis only sensitive to the average radial structure as expected. All data show that cryo-TEMmicrographs can be evaluated to yield quantitative information about the structure of colloidal particles.</dcterms:abstract>
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