Gold Nanoparticles Protected with pH and Temperature-Sensitive Diblock Copolymers
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...
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| Veröffentlicht in: | Langmuir 2007-05, Vol.23 (10), p.5352-5357 |
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| creator | Nuopponen, Markus Tenhu, Heikki |
| description | 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. |
| doi_str_mv | 10.1021/la063240m |
| format | Article |
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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.</description><identifier>ISSN: 0743-7463</identifier><identifier>EISSN: 1520-5827</identifier><identifier>DOI: 10.1021/la063240m</identifier><identifier>PMID: 17429987</identifier><identifier>CODEN: LANGD5</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Acrylic Resins ; Chemistry ; Colloidal state and disperse state ; Exact sciences and technology ; General and physical chemistry ; Gold ; Hot Temperature ; Hydrogen-Ion Concentration ; Metal Nanoparticles ; Physical and chemical studies. Granulometry. 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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.</description><subject>Acrylic Resins</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Gold</subject><subject>Hot Temperature</subject><subject>Hydrogen-Ion Concentration</subject><subject>Metal Nanoparticles</subject><subject>Physical and chemical studies. Granulometry. Electrokinetic phenomena</subject><subject>Polymethacrylic Acids</subject><subject>Surface Plasmon Resonance</subject><issn>0743-7463</issn><issn>1520-5827</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpt0Etv1DAUhmELUdGhsOAPoGxAYhHqu50lmsIUqeqFDmwtxzkRbp04tR2g_56gGXU2rLzwo09HL0JvCP5IMCWnwWLJKMfDM7QiguJaaKqeoxVWnNWKS3aMXuZ8hzFuGG9eoGOiOG0arVboZhNDV13aMU42Fe8C5Oo6xQKuQFf99uVnNZ1XduyqLQwTJFvmBPUtjNkX_wuqM9-G6O6rdZxieBwg5VfoqLchw-v9e4K-f_m8XZ_XF1ebr-tPF7VlmpQarJBWtZ2jjHaYCitAOEWh4Q4Ub7XWPWfgFGNSKSAdFn3POWm55hxLqdkJer_bnVJ8mCEXM_jsIAQ7QpyzUZhLohq5wA876FLMOUFvpuQHmx4NweZfP_PUb7Fv96NzO0B3kPtgC3i3BzY7G_pkR-fzwS1EadYsrt45nwv8efq36d7IhQizvb419MdG4DN8Y74ddq3L5i7OaVza_efAv4r2koQ</recordid><startdate>20070508</startdate><enddate>20070508</enddate><creator>Nuopponen, Markus</creator><creator>Tenhu, Heikki</creator><general>American Chemical Society</general><scope>BSCLL</scope><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20070508</creationdate><title>Gold Nanoparticles Protected with pH and Temperature-Sensitive Diblock Copolymers</title><author>Nuopponen, Markus ; Tenhu, Heikki</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a381t-ea56a7bdc232d025a5e5c72e94ce74b888f43ec733677e1d05ff441b484406683</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Acrylic Resins</topic><topic>Chemistry</topic><topic>Colloidal state and disperse state</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Gold</topic><topic>Hot Temperature</topic><topic>Hydrogen-Ion Concentration</topic><topic>Metal Nanoparticles</topic><topic>Physical and chemical studies. Granulometry. Electrokinetic phenomena</topic><topic>Polymethacrylic Acids</topic><topic>Surface Plasmon Resonance</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nuopponen, Markus</creatorcontrib><creatorcontrib>Tenhu, Heikki</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Langmuir</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nuopponen, Markus</au><au>Tenhu, Heikki</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Gold Nanoparticles Protected with pH and Temperature-Sensitive Diblock Copolymers</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>2007-05-08</date><risdate>2007</risdate><volume>23</volume><issue>10</issue><spage>5352</spage><epage>5357</epage><pages>5352-5357</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><coden>LANGD5</coden><abstract>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.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>17429987</pmid><doi>10.1021/la063240m</doi><tpages>6</tpages></addata></record> |
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| subjects | Acrylic Resins Chemistry Colloidal state and disperse state Exact sciences and technology General and physical chemistry Gold Hot Temperature Hydrogen-Ion Concentration Metal Nanoparticles Physical and chemical studies. Granulometry. Electrokinetic phenomena Polymethacrylic Acids Surface Plasmon Resonance |
| title | Gold Nanoparticles Protected with pH and Temperature-Sensitive Diblock Copolymers |
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