Carboxylic acid-directed clustering and dispersion of ZrO2 nanoparticles in organic solvents: a study by small-angle x-ray/neutron scattering and NMR

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dc.contributor.authorWang, SHen_AU
dc.contributor.authorSun, YSen_AU
dc.contributor.authorChiang, ASTen_AU
dc.contributor.authorHung, HFen_AU
dc.contributor.authorChen, MCen_AU
dc.contributor.authorWood, Ken_AU
dc.date.accessioned2011-12-06T04:34:48Zen_AU
dc.date.available2011-12-06T04:34:48Zen_AU
dc.date.issued2011-06-23en_AU
dc.date.statistics2011-12-06en_AU
dc.description.abstractThe stable dispersion of nanoparticles in organic solvents, essential for their practical application, is often achieved by the grafting of organic dispersants. Good dispersion is usually assumed when a transparent colloidal sol is formed. However, even in such a case, the dispersion may not be in the form of distinct nanoparticles. In this study, zirconia nanoparticles have been modified with a series of carboxylic acids so that they can be dispersed in polar protic/aprotic solvents or nonpolar organic solvents as transparent colloidal sols. The dispersed state in these solvents was characterized by SAXS and SANS. In most cases, the transparent sol consists of "soft" secondary clusters generated from the ZrO2 nanoparticles. The size and fractal structure of the dispersed clusters varied with the acid modifier. Only in the linoleic acid-modified case and with chloroform as the solvent was the ZrO2 dispersed as primary particles. However, the same modification leads to secondary clusters in other solvents, such as toluene and benzene, with similar solubility parameters. The difference in the dispersion states calls for a molecular-level interpretation. It was proposed that the grafted LOA exists as a swollen and extended brush in benzene and toluene, but as a folded and compact shell in chloroform. The proposed shell structures were then confirmed by the proximity of the chain tail with the middle section observed on 2D NOESY H-1 NMR spectra. © 2011, American Chemical Societyen_AU
dc.identifier.citationWang, S.H., Sun, Y.S., Chiang, A.S.T., Hung, H.F., Chen, M.C., Wood, K. (2011). Carboxylic acid-directed clustering and dispersion of ZrO(2) nanoparticles in organic solvents: a study by small-angle x-ray/neutron scattering and NMR. Journal of Physical Chemistry C, 115(24), 11941-11950. doi:10.1021/jp202243zen_AU
dc.identifier.govdoc3825en_AU
dc.identifier.issn1932-7447en_AU
dc.identifier.issue24en_AU
dc.identifier.journaltitleJournal of Physical Chemistry Cen_AU
dc.identifier.pagination11941-11950en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/jp202243zen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3922en_AU
dc.identifier.volume115en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectCarboxylic acidsen_AU
dc.subjectSmall angle scatteringen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectFilmsen_AU
dc.subjectOrganic solventsen_AU
dc.subjectCoatingsen_AU
dc.titleCarboxylic acid-directed clustering and dispersion of ZrO2 nanoparticles in organic solvents: a study by small-angle x-ray/neutron scattering and NMRen_AU
dc.typeJournal Articleen_AU
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