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231223s2007 xx ||||| 00| ||eng c |
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|a pubmed24n0566.xml
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|a (DE-627)NLM169624021
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|a (NLM)17429987
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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 Nuopponen, Markus
|e verfasserin
|4 aut
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|a Gold nanoparticles protected with pH and temperature-sensitive diblock copolymers
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 27.06.2007
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|a Date Revised 21.11.2008
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Aqueous dispersions of gold nanoparticles protected with a stimuli-sensitive diblock copolymer were studied as a function of pH and temperature. Poly(methacrylic acid)-block-poly(N-isopropylacrylamide), PMAA-b-PNIPAM, copolymer was synthesized using the RAFT technique. A one-pot method utilizing the dithiobenzoate functionalized polymer was used to prepare gold nanoparticles protected with PMAA-b-PNIPAM. The gold nanoparticles coated with block copolymers, with the PNIPAM block bound to the particle surface and PMAA as an outer block form stimuli-sensitive aggregates in water. The changes in the absorption maxima of the surface plasmon resonance, SPR, of the gold particles and in the size of the aggregates were investigated as a function of pH and temperature. pH was observed to affect the size of the aggregates, whereas the effect of temperature was moderate. However, a blue shift in the SPR was observed both with decreasing pH and increasing temperature. Whereas the PMAA blocks control the colloidal stability of the particles and their aggregates, the thermo-sensitive PNIPAM blocks have a noticeable effect on the polarity of the immediate surroundings of the particles
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Acrylic Resins
|2 NLM
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|a Polymethacrylic Acids
|2 NLM
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|a poly-N-isopropylacrylamide
|2 NLM
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|a 25189-55-3
|2 NLM
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|a Gold
|2 NLM
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|a 7440-57-5
|2 NLM
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| 700 |
1 |
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|a Tenhu, Heikki
|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 23(2007), 10 vom: 08. Mai, Seite 5352-7
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:23
|g year:2007
|g number:10
|g day:08
|g month:05
|g pages:5352-7
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|a AR
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|d 23
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|h 5352-7
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