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@ARTICLE{Sharma:908553,
author = {Sharma, Aakash and Kruteva, Margarita and Zamponi, Michaela
and Ehlert, Sascha and Richter, Dieter and Förster,
Stephan},
title = {{Q}uasielastic neutron scattering reveals the temperature
dependent rotational dynamics of densely grafted oleic acid},
journal = {The journal of chemical physics},
volume = {156},
number = {16},
issn = {0021-9606},
address = {Melville, NY},
publisher = {American Institute of Physics},
reportid = {FZJ-2022-02677},
pages = {164908 -},
year = {2022},
abstract = {We study the dynamics of pure oleic acid and grafted oleic
acid synthesized by decomposing iron oleate into oleic acid
grafted iron oxide nanoparticles. Our quasielastic neutron
scattering study shows that oleic acid dominantly performs
translational diffusion at room temperature. On the other
hand, in nanocomposites, constraints imposed by grafting and
crowding of neighboring chains restrict the grafted oleic
acid to uniaxial rotation. Interestingly, it also manifests
mobility in grafted oleic acid below the crystallization
temperature of pure oleic acid. The data from grafted oleic
acid could be effectively described using a uniaxial
rotational diffusion model with an additional elastic
scattering contribution. This kind of elastic scattering
arises due to the restricted bond mobility and increases
with decreasing temperature. The radius of rotation obtained
from the fitted data agrees very well with the geometry of
the molecule and grafting density. These results open
possibilities of research on the confined surfactant
systems, which could be analyzed using the approach
described here},
cin = {JCNS-FRM-II / MLZ / JCNS-1 / JCNS-2 / JCNS-4 / PGI-4 /
JARA-FIT},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
I:(DE-Juel1)JCNS-4-20201012 / I:(DE-Juel1)PGI-4-20110106 /
$I:(DE-82)080009_20140620$},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
(POF4-6G4) / 632 - Materials – Quantum, Complex and
Functional Materials (POF4-632)},
pid = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
experiment = {EXP:(DE-MLZ)SPHERES-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {35490007},
UT = {WOS:000818945100017},
doi = {10.1063/5.0089874},
url = {https://juser.fz-juelich.de/record/908553},
}