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231223s2006 xx ||||| 00| ||eng c |
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|a eng
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|a Qiu, Dong
|e verfasserin
|4 aut
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|a Small-angle neutron scattering study of concentrated colloidal dispersions
|b the electrostatic/steric composite interactions between colloidal particles
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|c 2006
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|b nc
|2 rdacarrier
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|a Date Completed 03.08.2007
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|a Date Revised 27.06.2006
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Small-angle neutron scattering was used to investigate the interactions in concentrated colloidal dispersions containing silica or polystyrene latex with adsorbed polyethyleneoxide (PEO). In these dispersions of charged particles, both electrostatic and steric repulsions are present. The PEO layer was made invisible to neutrons through contrast matching. The effect of the interparticle repulsion was clearly shown in the scattering spectra by the appearance of a peak at low Q. The effective potentials can be well described by the Hayter-Penfold/Yukawa (HPY) potential. In the silica dispersions studied, the layer thickness is small, hence the electrostatic potential dominates and the potential has a lower concentration dependence. In the dispersions of polystyrene latex, the adsorbed layer is thicker; consequently, the electrostatic potential dominates at low volume fraction (the potential has a lower concentration dependence), and the steric potential dominates at higher volume fraction (the potential has a higher concentration dependence). This study also suggests that when more than one potential is present the stronger one has a dominant influence in determining the structure factor. This finding makes it possible to describe the multicomponential interactions by a single function
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|a Journal Article
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|a Cosgrove, Terence
|e verfasserin
|4 aut
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|a Howe, Andrew M
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 22(2006), 14 vom: 04. Juli, Seite 6060-7
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
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| 773 |
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|g volume:22
|g year:2006
|g number:14
|g day:04
|g month:07
|g pages:6060-7
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|d 22
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|h 6060-7
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