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@ARTICLE{Pipich:859753,
author = {Pipich, Vitaliy and Schlenstedt, Kornelia and Dickmann,
Marcel and Kasher, Roni and Meier-Haack, Jochen and
Hugenschmidt, Christoph and Petry, Winfried and Oren, Yoram
and Schwahn, Dietmar},
title = {{M}orphology and porous structure of standalone aromatic
polyamide films as used in {RO} membranes – {A}n
exploration with {SANS}, {PALS}, and {SEM}},
journal = {Journal of membrane science},
volume = {573},
issn = {0376-7388},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2019-00590},
pages = {167 - 176},
year = {2019},
abstract = {This report presents a study about the morphology of a
cross-linked aromatic polyamide (PA) film in its dry and wet
state using small-angle neutron scattering (SANS), positron
annihilation lifetime spectroscopy (PALS), and scanning
electron microscopy (SEM). PA is used as active skin layer
for reverse osmosis membranes and determines the selectivity
of the membrane with respect to water and salt molecules.
This selectivity of PA is largely determined from its
morphology. The PA film scatters the neutrons much stronger
and shows a different profile as expected from randomly
distributed nanoscopic large pores. SANS contrast variation,
using supercritical CO2 as contrast medium, confirms that
pores are the only scattering centers. The analysis shows
that interconnected pores of an average radius of about 16
Å determine the scattering. The pores are formed as a
network of channels showing a fractal structure. PALS
determines pores of ∼6 Å diameter representing the
diameter of such channels. The volume fraction of the pores
is estimated as $∼10\%$ which after water up-take
increases by $∼30\%$ due to slightly swelling of the
pores.},
cin = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
ddc = {570},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15) / 6215 - Soft Matter,
Health and Life Sciences (POF3-621)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15 /
G:(DE-HGF)POF3-6215},
experiment = {EXP:(DE-MLZ)KWS1-20140101 / EXP:(DE-MLZ)KWS3-20140101 /
EXP:(DE-MLZ)NEPOMUC-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000454830600018},
doi = {10.1016/j.memsci.2018.11.055},
url = {https://juser.fz-juelich.de/record/859753},
}