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@ARTICLE{Knig:861056,
author = {König, Nico and Willner, Lutz and Pipich, Vitaliy and
Zinn, Thomas and Lund, Reidar},
title = {{C}ooperativity during {M}elting and {M}olecular {E}xchange
in {M}icelles with {C}rystalline {C}ores},
journal = {Physical review letters},
volume = {122},
number = {7},
issn = {1079-7114},
address = {College Park, Md.},
publisher = {APS},
reportid = {FZJ-2019-01640},
pages = {078001},
year = {2019},
abstract = {Molecular exchange processes are important equilibration
and transport mechanisms in both synthetic and biological
self-assembled systems such as micelles, vesicles, and
membranes. Still, these processes are not entirely
understood, in particular the effect of crystallinity and
the interplay between cooperative melting processes and
chain exchange. Here we focus on a set of simple polymer
micelles formed by binary mixtures of poly(ethylene
oxide)-mono-n-alkyl-ethers (Cn−PEO5) which allows the
melting point to be tuned over a wide range. We show that
the melting transition is cooperative in the confined 4–5
nm micellar core, whereas the exchange process is widely
decoupled and unimeric in nature. As confirmed by
differential scanning calorimetry, the total activation
energy for ejecting a molecule out of the micellar core
below the melting point is the sum of the enthalpy of fusion
and the corresponding activation energy in the melt state.
This suggests that a “local, single-chain melting
process” preludes the molecular diffusion out of the
micelle during chain exchange.},
cin = {JCNS-1 / ICS-1 / JCNS-FRM-II},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218},
pnm = {551 - Functional Macromolecules and Complexes (POF3-551) /
6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
pid = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
G:(DE-HGF)POF3-6215},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000459311800010},
doi = {10.1103/PhysRevLett.122.078001},
url = {https://juser.fz-juelich.de/record/861056},
}