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|a 10.1021/la202176u
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|a eng
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1 |
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|a Lee, Jung-Hyun
|e verfasserin
|4 aut
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| 245 |
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|a Non-DLVO silica interaction forces in NMP-water mixtures. II. An asymmetric system
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|c 2011
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|a Text
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|a ƒaComputermedien
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|a Date Completed 09.01.2012
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|a Date Revised 09.08.2011
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The interaction between energetically asymmetric hydrophilic and hydrophobic surfaces has fundamental and practical importance in both industrial and natural colloidal systems. The interaction forces between a hydrophilic silica sphere and a silanated, hydrophobic glass plate in N-methyl-2-pyrrolidone (NMP)-water binary mixtures were measured using atomic force microscopy (AFM). A strong and long-range attractive force was observed in pure water and was attributed to the formation of capillary bridges associated with nanoscale bubbles initially present on the hydrophobic surface. When NMP was added, the capillary force and corresponding pull-off force became less attractive, which was explained readily in terms of the surface wettability by the binary solvent mixture. Similar to the case of symmetric (two hydrophilic) surfaces, the range of attraction between the asymmetric surfaces was maximized at around 30 vol % NMP, which is consistent with the formation of a thick adsorbed macrocluster layer on the hydrophilic silica surface
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|a Journal Article
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|a Meredith, J Carson
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|t Langmuir : the ACS journal of surfaces and colloids
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