TY  - JOUR
A1  - Noack, Sebastian
A1  - Schanzenbach, Dirk
A1  - Koetz, Joachim
A1  - Schlaad, Helmut
T1  - Polylactide-based amphiphilic block copolymers
BT  - Crystallization-Induced Self-Assembly and Stereocomplexation
JF  - Macromolecular rapid communications
N2  - The aqueous self-assembly behavior of a series of poly(ethylene glycol)-poly(l-/d-lactide) block copolymers and corresponding stereocomplexes is examined by differential scanning calorimetry, dynamic light scattering, and transmission electron microscopy. Block copolymers assemble into spherical micelles and worm-like aggregates at room temperature, whereby the fraction of the latter seemingly increases with decreasing lactide weight fraction or hydrophobicity. The formation of the worm-like aggregates arises from the crystallization of the polylactide by which the spherical micelles become colloidally unstable and fuse epitaxically with other micelles. The self-assembly behavior of the stereocomplex aggregates is found to be different from that of the block copolymers, resulting in rather irregular-shaped clusters of spherical micelles and pearl-necklace-like structures.
KW  - crystallization
KW  - polylactide
KW  - self-assembly
KW  - stereocomplexation
Y1  - 2018
U6  - https://doi.org/10.1002/marc.201800639
SN  - 1022-1336
SN  - 1521-3927
VL  - 40
IS  - 1
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Stanglmair, Christoph
A1  - Neubrech, Frank
A1  - Pacholski, Claudia
T1  - Chemical routes to surface enhanced infrared absorption (SEIRA) substrates
JF  - Zeitschrift für physikalische Chemie : international journal of research in physical chemistry and chemical physics
N2  - Bottom-up strategies for fabricating SEIRA substrates are presented. For this purpose, wet-chemically prepared gold nanoparticles are coated with a polystyrene shell and subsequently self-assembled into different nanostructures such as quasi-hexagonally ordered gold nanoparticle monolayers, double layers, and honeycomb structures. Furthermore elongated gold nanostructures are obtained by sintering of gold nanoparticle double layers. The optical properties of these different gold nanostructures are directly connected to their morphology and geometrical arrangement - leading to surface plasmon resonances from the visible to the infrared wavelength range. Finally, SEIRA enhancement factors are determined. Gold nanoparticle double layers show the best performance as SEIRA substrates.
KW  - bottom-up
KW  - gold nanoparticles
KW  - self-assembly
KW  - surface enhanced spectroscopy
Y1  - 2018
U6  - https://doi.org/10.1515/zpch-2018-1132
SN  - 0942-9352
VL  - 232
IS  - 9-11
SP  - 1527
EP  - 1539
PB  - De Gruyter
CY  - Berlin
ER  -