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@ARTICLE{Granite:22223,
      author       = {Granite, M. and Radulescu, A. and Cohen, Y.},
      title        = {{S}mall-{A}ngle {N}eutron {S}cattering from {A}queous
                      {D}ispersions of {S}ingle-{W}alled {C}arbon {N}anotubes with
                      {P}luronic {F}127 and {P}oly(vinylpyrrolidone)},
      journal      = {Langmuir},
      volume       = {28},
      issn         = {0743-7463},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {PreJuSER-22223},
      pages        = {11025 - 11031},
      year         = {2012},
      note         = {This research was supported by the Israel Science
                      Foundation (grant no. 191/07). This work is based in part on
                      experiments performed at the Julich Centre for Neutron
                      Science JCNS at FRM-II, Munich, Germany. This project has
                      been supported by the European Commission under the Seventh
                      Framework Program through the key action Strengthening the
                      European Research Area, Research Infrastructures (contract
                      no. 283883 (NMI3-II)).},
      abstract     = {Amphiphilic block copolymers are excellent dispersants for
                      single-walled carbon nanotubes (SWCNT) in aqueous
                      environments, where their noncovalent attachments do not
                      affect the π chemical bonding. In this small-angle neutron
                      scattering (SANS) study, we investigate whether the coverage
                      of Pluronic F127 polymers around the CNTs depends on the
                      solution concentration in the range of $1-6\%$ (w/w). The
                      observations indicate that at these concentrations the SWCNT
                      surface is fully saturated at about 14 chains per unit
                      length of 100 Å. Furthermore, we seek to verify whether the
                      unusual effect observed in a previous study by contrast
                      variation, interpreted as being due to a dense hydration
                      layer around the polymer chains, also appears using a
                      homopolymer (polyvinylpyrrolidone - PVP) that does not
                      contain poly(ethylene oxide) (PEO) units. The SANS patterns
                      showed again a minimal intensity value at much higher
                      solvent composition $(75\%$ D(2)O) than the expected value
                      of $29\%$ D(2)O. The minimum scattering curve exhibited a
                      nearly q(-1) power law at small angles, an indication of
                      rodlike entities. A model of a CNT thin bundle with loosely
                      adsorbed polymer chains around it (core-chains) was
                      reasonably well fitted to the data. The polymer chains are
                      assumed to be surrounded by a water layer with a slightly
                      higher density than bulk water, having partial selectivity
                      for D(2)O.},
      keywords     = {J (WoSType)},
      cin          = {ICS-1 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / JCNS-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)ICS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung (FUEK505) / 544 - In-house Research
                      with PNI (POF2-544) / NMI3-II - Neutron Scattering and Muon
                      Spectroscopy Integrated Initiative (283883)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(DE-HGF)POF2-544 /
                      G:(EU-Grant)283883},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      shelfmark    = {Chemistry, Multidisciplinary / Chemistry, Physical /
                      Materials Science, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22762521},
      UT           = {WOS:000309199900009},
      doi          = {10.1021/la302307m},
      url          = {https://juser.fz-juelich.de/record/22223},
}