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231223s2008 xx |||||o 00| ||eng c |
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|a 10.1021/la800860q
|2 doi
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|a pubmed24n0605.xml
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|a (DE-627)NLM181375788
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|a (NLM)18680324
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Ali, Nauman
|e verfasserin
|4 aut
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|a Micellar structures of poly(styrene-b-4-vinylpyridine)s in THF/toluene mixtures and their functionalization with gold
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|c 2008
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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
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|2 rdacarrier
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|a Date Completed 13.11.2008
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a The effects of the block copolymer composition and the solvent selectivity on the micellar morphologies of poly(styrene- b-4-vinylpyridine)s (PS- b-P4VPs) and their functionalizations with gold were studied in 10 mg/mL solutions using small-angle X-ray scattering and transmission electron microscopy (TEM). The solvent selectivity for the PS block was controlled by toluene/tetrahydrofuran (THF) mixtures in which toluene and THF are selective for PS and nonselective, respectively. The micellar structure was strongly dependent on phi (wt % toluene in toluene/THF mixture) and the composition of the block copolymers. PS(12K)- b-P4VP(11.8K) (symmetric) showed spherical micelles in the entire range of phi except phi = 0 (THF, nonselective solvent). PS(3.3K)- b-P4VP(18.7K) (asymmetric, longer P4VP) showed multiple morphologies with transitions from spheres to cylinders and finally to vesicles with an increase in phi. PS(19.6K)- b-P4VP(5.1K) (asymmetric, longer PS) showed spherical micelles only at the narrow ranges of 90 wt % <or= phi <or= 100 wt % and an isotropic state at the other ranges. The micelles formed a complex with HAuCl 4 and were reduced with hydrazine in the solvent mixtures. The morphologies of micelles, hybrid micelles, and gold nanoparticles were investigated by using TEM and UV/vis spectroscopy. The possible mechanisms leading to these morphological changes and the formation of the nanosized gold particles were also discussed
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Furans
|2 NLM
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|a Micelles
|2 NLM
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|a Polymers
|2 NLM
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|a Polystyrenes
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|a Polyvinyls
|2 NLM
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|a Pyridines
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|a Solvents
|2 NLM
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|a polystyrene-block-poly(4-vinylpyridine)
|2 NLM
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|a Toluene
|2 NLM
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|a 3FPU23BG52
|2 NLM
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|a tetrahydrofuran
|2 NLM
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|a 3N8FZZ6PY4
|2 NLM
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|a Gold
|2 NLM
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|a 7440-57-5
|2 NLM
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|a Park, Soo-Young
|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 24(2008), 17 vom: 02. Sept., Seite 9279-85
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:24
|g year:2008
|g number:17
|g day:02
|g month:09
|g pages:9279-85
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|u http://dx.doi.org/10.1021/la800860q
|3 Volltext
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