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|a DE-627
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|a eng
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| 100 |
1 |
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|a Kayano, Yoshisada
|e verfasserin
|4 aut
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| 245 |
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|a Nanorheology of dioctyl phthalate confined between surfaces coated with long alkyl chains
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| 264 |
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|c 2007
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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 02.10.2007
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|a Date Revised 24.07.2007
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a To shed light on the mechanism related to the high viscosity of a precipitated calcium carbonate (PCC) dispersion in dioctyl phthalate (DOP), the viscosity of DOP in a nanometer space was investigated using the shear resonance measurement. We used mica surfaces modified with dioctadecyldimethylammonium bromide (DODA) as a model of a PCC surface which bears long alkyl chains and bare mica surfaces as a reference. We found that a resonance peak for DOP of high water content (1164 ppm) confined between the DODA-modified surfaces gradually decreased upon approach from a distance of 320.6 nm and disappeared at ca. 57 nm. This indicated that the viscosity of DOP increased with decreasing distance, and a highly ordered state appeared at a large separation of 57 nm. This highly ordered state, however, cannot be observed for DOP of low water content (469 ppm) confined between the DODA-modified surfaces. The resonance peak for DOP of high water content (1164 ppm) between bare mica surfaces gradually decreased upon approach from a distance of 358.4 nm and disappeared at 10.7 nm, which is much shorter than the value for the DODA-modified surfaces. These results could be correlated with the high macroscopic viscosity of a dispersion of PCC coated with long alkyl chains in DOP. We propose the interpenetration of the long alkyl chains and the hydrogen-bonding network of DOP molecules mediated by water molecules as a plausible model for interpreting the high viscosity of coated PCC dispersions
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|a Journal Article
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|a Sakuma, Hiroshi
|e verfasserin
|4 aut
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|a Kurihara, Kazue
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 23(2007), 16 vom: 31. Juli, Seite 8365-70
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|x 1520-5827
|7 nnns
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| 773 |
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|g volume:23
|g year:2007
|g number:16
|g day:31
|g month:07
|g pages:8365-70
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