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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.7b00723
|2 doi
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|a pubmed25n0909.xml
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|a (DE-627)NLM272741817
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|a (NLM)28594563
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Yu, Kai
|e verfasserin
|4 aut
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| 245 |
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|a Foaming Behavior of Polymer-Coated Colloids
|b The Need for Thick Liquid Films
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|c 2017
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 17.07.2018
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|a Date Revised 17.07.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The current study examined the foaming behavior of poly(vinylpyrrolidone) (PVP)-silica composite nanoparticles. Individually, the two components, PVP and silica nanoparticles, exhibited very little potential to partition at the air-water interface, and as such, stable foams could not be generated. In contrast, combining the two components to form silica-PVP core-shell nanocomposites led to good "foamability" and long-term foam stability. Addition of an electrolyte (Na2SO4) was shown to have a marked effect on the foam stability. By varying the concentration of electrolyte between 0 and 0.55 M, three regions of foam stability were observed: rapid foam collapse at low electrolyte concentrations, delayed foam collapse at intermediate concentrations, and long-term stability (∼10 days) at the highest electrolyte concentration. The observed transitions in foam stability were better understood by studying the microstructure and physical and mechanical properties of the particle-laden interface. For rapidly collapsing foams the nanocomposite particles were weakly retained at the air-water interface. The interfaces in this case were characterized as being "liquid-like" and the foams collapsed within 100 min. At an intermediate electrolyte concentration (0.1 M), delayed foam collapse over ∼16 h was observed. The particle-laden interface was shown to be pseudo-solid-like as measured under shear and compression. The increased interfacial rigidity was attributed to adhesion between interpenetrating polymer layers. For the most stable foam (prepared in 0.55 M Na2SO4), the ratio of the viscoelastic moduli, G'/G″, was found to be equal to ∼3, confirming a strongly elastic interfacial layer. Using optical microscopy, enhanced foam stability was assessed and attributed to a change in the mechanism of foam collapse. Bubble-bubble coalescence was found to be significantly retarded by the aggregation of nanocomposite particles, with the long-term destabilization being recognized to result from bubble coarsening. For rapidly destabilizing foams, the contribution from bubble-bubble coalescence was shown to be more significant
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Zhang, Huagui
|e verfasserin
|4 aut
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| 700 |
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|a Hodges, Chris
|e verfasserin
|4 aut
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| 700 |
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|a Biggs, Simon
|e verfasserin
|4 aut
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| 700 |
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|a Xu, Zhenghe
|e verfasserin
|4 aut
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| 700 |
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|a Cayre, Olivier J
|e verfasserin
|4 aut
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| 700 |
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|a Harbottle, David
|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 1985
|g 33(2017), 26 vom: 05. Juli, Seite 6528-6539
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:33
|g year:2017
|g number:26
|g day:05
|g month:07
|g pages:6528-6539
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|u http://dx.doi.org/10.1021/acs.langmuir.7b00723
|3 Volltext
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