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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la902427r
|2 doi
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|a pubmed24n0642.xml
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|a (NLM)19874006
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|a DE-627
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|c DE-627
|e rakwb
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|a eng
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1 |
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|a Wang, Chih-Wei
|e verfasserin
|4 aut
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| 245 |
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|a Controlled self-assembly of quantum dot-block copolymer colloids in multiphase microfluidic reactors
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 11.03.2010
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|a Date Revised 13.01.2010
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|a published: Print
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|a Citation Status MEDLINE
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|a The controlled self-assembly of large compound quantum dot micelles (QDCMs), consisting of constituents of polymer-stabilized quantum dots (QDs) and amphiphilic polystyrene-b-poly(acrylic acid) stabilizing chains, in gas-liquid segmented microfluidic reactors is demonstrated. Self-assembly is initiated by fast mixing of water with the polymer constituents via chaotic advection, as liquid plugs containing reactants move through a sinusoidal mixing channel. The resulting QDCMs are then processed within a postformation channel, where circulating flow patterns develop within the liquid plugs, followed by off-chip quenching and analysis by transmission electron microscopy (TEM). Particle processing via circulating flow is found to involve a combination of particle growth via collision-induced coalescence and shear-induced particle breakup. The final mean QDCM sizes represent kinetic states arising from the competition between these two mechanisms, depending on tunable chemical and flow parameters. A systematic investigation of the experimental variables that influence particle size and polydispersity, including water concentration, flow rate, and the gas-to-liquid flow ratio, is conducted, demonstrating tunability of QDCM sizes in the range of approximately 40-140 nm. The importance of shear-induced particle breakup in the limit of high shear is illustrated by a common minimum particle size, 41 +/- 1 nm, which is achieved for all water contents by increasing the total flow rate to sufficiently high values
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Colloids
|2 NLM
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|a Micelles
|2 NLM
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|a Polymers
|2 NLM
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1 |
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|a Oskooei, Ali
|e verfasserin
|4 aut
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|a Sinton, David
|e verfasserin
|4 aut
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|a Moffitt, Matthew G
|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 26(2010), 2 vom: 19. Jan., Seite 716-23
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:26
|g year:2010
|g number:2
|g day:19
|g month:01
|g pages:716-23
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|u http://dx.doi.org/10.1021/la902427r
|3 Volltext
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