Quantitative measurement of nanoparticle halo formation around colloidal microspheres in binary mixtures.
A new colloidal stabilization mechanism, known as nanoparticle 'haloing' (Tohver, V.; Smay, J. E.; Braem, A.; Braun, P. V.; Lewis, J. A. Proc. Natl. Acad. Sci. U.S.A. 2001, 98, (16), 8950-8954), has been predicted theoretically and inferred experimentally in microsphere--nanoparticle mixtures that possess high charge and size asymmetry. The term 'halo' implies the existence of a nonzero separation distance between the highly charged nanoparticles and the negligibly charged microspheres that they surround. By means of ultrasmall-angle X-ray scattering, we have quantified the microsphere--nanoparticle separation distance as well as the number of nanoparticles and their lateral separation distance within the self-organized halos that form in these binary mixtures.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 935294
- Report Number(s):
- ANL/XSD/JA-61928; LANGD5; TRN: US200815%%477
- Journal Information:
- Langmuir, Vol. 24, Issue 13 ; Jul. 1, 2008; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- ENGLISH
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