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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.0c00554
|2 doi
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|a pubmed24n1032.xml
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|a (DE-627)NLM309761832
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|a (NLM)32393027
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Bondaz, Louis
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Controlled Synthesis of Gold Nanoparticles in Copolymers Nanomolds by X-ray Radiolysis
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|c 2020
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| 336 |
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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 Revised 09.06.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We show by X-ray and neutron small-angle scattering that gold nanoparticles with controlled sizes and morphologies can be obtained by the metallic reduction of AuCl4- ions trapped in 3D organic molds by X-ray radiolysis. The molds are spherical frozen micelles of polystyrene-b-poly(dimethylaminoethyl methacrylate) (PS-b-PDMAEMA) block copolymer in acidic aqueous solution with a PS spherical core surrounded by a corona of PDMAEMA chains in good solvent. The behavior of micelles is controlled by the [AuCl4-]/[DMAEMA] ratio RAuCl4-/DMAEMA. At low gold concentration, AuCl4- ions condense on the positively charged DMAEMA moieties without changing the behavior of the PDMAEMA chains. At intermediate gold concentration, the ions induce a progressive contraction of the corona's chains and dehydration of micelles. At large gold concentration, the corona becomes a fully dry phase loaded with gold ions, which induces micelle aggregation. Radiolysis of the solution by an intense X-ray beam produces different types of gold nanoparticles with respect to RAuCl4-/DMAEMA and irradiation time. At RAuCl4-/DMAEMA = 0.033, irradiation produces in the first step gold clusters in the micelle corona which in the second step merge to form nanoparticles of a similar size to that of the micelle. Conversely, at RAuCl4-/DMAEMA = 0.33, micelles do not operate as templates but only as nucleation zones and large nanoparticles grow outside the micelles
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|a Journal Article
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1 |
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|a Fontaine, Philippe
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Muller, François
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Pantoustier, Nadège
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Perrin, Patrick
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Morfin, Isabelle
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Goldmann, Michel
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Cousin, Fabrice
|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 36(2020), 22 vom: 09. Juni, Seite 6132-6144
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:36
|g year:2020
|g number:22
|g day:09
|g month:06
|g pages:6132-6144
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|u http://dx.doi.org/10.1021/acs.langmuir.0c00554
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