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001     12063
005     20240619091942.0
024 7 _ |2 DOI
|a 10.1039/C0SM00671H
024 7 _ |2 WOS
|a WOS:000286110900038
024 7 _ |2 Handle
|a 2128/7258
037 _ _ |a PreJuSER-12063
041 _ _ |a eng
082 _ _ |a 530
084 _ _ |2 WoS
|a Chemistry, Physical
084 _ _ |2 WoS
|a Materials Science, Multidisciplinary
084 _ _ |2 WoS
|a Physics, Multidisciplinary
084 _ _ |2 WoS
|a Polymer Science
100 1 _ |0 P:(DE-HGF)0
|a Li, X.
|b 0
245 _ _ |a pH Responsiveness of Polyelectrolyte Dendrimers: A Dynamical Perspective
260 _ _ |a Cambridge
|b Royal Society of Chemistry (RSC)
|c 2011
300 _ _ |a 618 - 622
336 7 _ |a Journal Article
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440 _ 0 |0 16881
|a Soft Matter
|v 7
|x 1744-683X
|y 2
500 _ _ |a This research at Oak Ridge National Laboratory's SNS was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. CNMS is sponsored at ORNL by the Division of Scientific User Facilities, U.S. Department of Energy.
520 _ _ |a A combined quasi-elastic neutron scattering (QENS) and high-resolution solution NMR spectroscopy study was conducted to investigate the internal dynamics of aqueous (D2O) G5 PAMAM dendrimer solutions as a function of molecular protonation at room temperature. Localized motion of the dendrimer segments was clearly exhibited in the QENS data analysis while the global, center-of-mass translational diffusion was measured by NMR. Our results unambiguously demonstrate an increased rapidity in local scale (similar to 3 angstrom) motion upon increasing the molecular protonation. This is contrary to an intuitive picture that increased charge stiffens the dendrimer segments thereby inhibiting local motion. These charge-induced changes may be a result of interactions with the surrounding counterions and water molecules as the segments explore additional intra-dendrimer volume made available by slight electrostatic swelling and redistribution of mass in the dendrimer interior. This observation is relevant to development of a microscopic picture of dendrimer-based packages as guest-molecule delivery vehicles because reorganization of the confining dendrimer segments must be a precursor to guest-molecule release.
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|a Hong, K.
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|a Shew, C.-Y.
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|a Chen, W.-R.
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773 _ _ |0 PERI:(DE-600)2191476-X
|a 10.1039/c0sm00671h
|g Vol. 7, p. 618 - 622
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|t Soft matter
|v 7
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|y 2011
856 7 _ |u http://dx.doi.org/10.1039/C0SM00671H
856 4 _ |u https://juser.fz-juelich.de/record/12063/files/FZJ-12063.pdf
|y Published under German "Allianz" Licensing conditions on 2010-11-23. Available in OpenAccess from 2011-11-23
|z Published final document.
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