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|a eng
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| 100 |
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|a Sierra-Martín, B
|e verfasserin
|4 aut
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|a Thermal control over the electrophoresis of soft 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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|2 rdacarrier
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|a Date Completed 09.07.2007
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|a Date Revised 04.04.2006
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a We study the electrophoresis of surface-charged thermosensitive microgel particles based on poly-N-isopropylacrylamide (PNIPAM); these deswell with increasing temperature T. Our results show that the electrophoretic mobility mu is affected by the temperature-induced volume phase transition. It increases with increasing temperature, as a result of the charge density increase induced by particle deswelling. Temperature thus allows control of mu, in contrast to the more conventional charged hard spheres for which mu is T independent. Salt also affects the mu behavior and gives rise to rich phenomenology, sharing common characteristics with charged hard spheres and polyelectrolyte-coated colloids depending on whether the microgels are swollen or deswollen. We interpret the effects of salt concentration n by considering that particle charges are located in an external shell, as confirmed by titrations, and that it is this shell-salt-induced compression that affects the resulting mu behavior
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|a Journal Article
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|a Romero-Cano, M S
|e verfasserin
|4 aut
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|a Fernández-Nieves, A
|e verfasserin
|4 aut
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|a Fernández-Barbero, A
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 22(2006), 8 vom: 11. Apr., Seite 3586-90
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|x 1520-5827
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|g volume:22
|g year:2006
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|g day:11
|g month:04
|g pages:3586-90
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