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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la1007457
|2 doi
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|a eng
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| 100 |
1 |
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|a Karpitschka, Stefan
|e verfasserin
|4 aut
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| 245 |
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|a Quantitative experimental study on the transition between fast and delayed coalescence of sessile droplets with different but completely miscible liquids
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|c 2010
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|a Text
|b txt
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 01.12.2010
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|a Date Revised 29.07.2010
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Quantitative experimental data on the coalescence behavior of sessile droplets with different but completely miscible liquids are presented. The liquids consist of various aqueous mixtures of different nonvolatile diols and carbon acids with surface tensions ranging from 33 to 68 mN/m, contact angles between 9 degrees and 20 degrees, and viscosities from 1 to 12 cP. Two distinctly different coalescence behaviors, a delayed and a fast regime, are found. The transition between the two behaviors is remarkably sharp. It is found that the coalescence mode depends predominantly on the differences in the surface tensions of the two droplets. If the surface tension difference exceeds approximately 3 mN/m, the coalescence is delayed. If it is less, droplet fusion occurs fast. Within the investigated parameter space, the transition seems independent from droplet size, absolute values of the surface tensions, and viscosity. Certain aspects of the experimental findings are explained with the simple hydrodynamic model presented in a recent publication
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|a Journal Article
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|a Riegler, Hans
|e verfasserin
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|t Langmuir : the ACS journal of surfaces and colloids
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|g 26(2010), 14 vom: 20. Juli, Seite 11823-9
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