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@ARTICLE{Yeh:887893,
author = {Yeh, Yi-Qi and Su, Chun-Jen and Wang, Chen-An and Lai,
Ying-Chu and Tang, Chih-Yuan and Di, Zhenyu and
Frielinghaus, Henrich and Su, An-Chung and Jeng, U-Ser and
Mou, Chung-Yuan},
title = {{D}iatom-inspired self-assembly for silica thin sheets of
perpendicular nanochannels},
journal = {Journal of colloid and interface science},
volume = {584},
issn = {0021-9797},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2020-04499},
pages = {647-659},
year = {2021},
abstract = {Hypothesis: Multistage silicate self-organization into
light-weight, high-strength, hierarchically pat-terned
diatom frustules carries hints for innovative silica-based
nanomaterials. With sodium silicate in a biomimetic sol-gel
system templated by a tri-surfactant system of
hexadecyltrimethylammonium bro-mide, sodium dodecylsulfate,
and poly(oxyethylene-b-oxypropylene-b-oxyethylene) (P123),
mesoporous silica nanochannel plates with perpendicular
channel orientation are synthesized. The formation process,
analogous to that of diatom frustules, is postulated to be
directed by an oriented self-assembly of the block copolymer
micelles shelled with charged catanionic surfactants upon
silication.Experiments: The postulated formation process for
the oriented silica nanochannel plates was investi-gated
using time-resolved small-angle X-ray and neutron scattering
(SAXS/SANS) and freeze fracture replication transmission
electron microscopy (FFR-TEM).Findings: With fine-tuned
molar ratios of the anionic, cationic, and nonionic
surfactants, the catanionic combination and the nonionic
copolymer form charged, prolate ternary micelles in aqueous
solutions, which further develop into prototype monolayered
micellar plates. The prolate shape and maximized surfactant
adsorption of the complex micelles, revealed from combined
SAXS/SANS analysis, are of crit-ical importance in the
subsequent micellar self-assembly upon silicate deposition.
Time-resolved SAXS and FFR-TEM indicate that the silicate
complex micelles coalesce laterally into the prototype
micellar nanoplates, which further fuse with one another
into large sheets of monolayered silicate micelles of
in-plane lamellar packing. Upon silica polymerization, the
in-plane lamellar packing of the micelles fur-ther
transforms to 2D hexagonal packing of vertically oriented
silicate channels. The unveiled structural features and
their evolution not only elucidate the previously unresolved
self-assembly process of through-thickness silica
nanochannels but also open a new line of research mimicking
free-standing frus-tules of diatoms.},
cin = {JCNS-FRM-II / JCNS-1 / MLZ},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
experiment = {EXP:(DE-MLZ)KWS1-20140101},
typ = {PUB:(DE-HGF)16},
pubmed = {33198979},
UT = {WOS:000600220000005},
doi = {10.1016/j.jcis.2020.10.114},
url = {https://juser.fz-juelich.de/record/887893},
}