TY  - GEN
A1  - Jiang, Yi
A1  - Mansfeld, Ulrich
A1  - Kratz, Karl
A1  - Lendlein, Andreas
T1  - Programmable microscale stiffness pattern of flat polymeric substrates by temperature-memory technology
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - Temperature-memory technology was utilized to generate flat substrates with a programmable stiffness pattern from cross-linked poly(ethylene-co-vinyl acetate) substrates with cylindrical microstructures. Programmed substrates were obtained by vertical compression at temperatures in the range from 60 to 100 degrees C and subsequent cooling, whereby a flat substrate was achieved by compression at 72 degrees C, as documented by scanning electron microscopy and atomic force microscopy (AFM). AFM nanoindentation experiments revealed that all programmed substrates exhibited the targeted stiffness pattern. The presented technology for generating polymeric substrates with programmable stiffness pattern should be attractive for applications such as touchpads. optical storage, or cell instructive substrates.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1102 
KW  - shape
KW  - surfaces
KW  - modulus
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-469745
SN  - 1866-8372
VL  - 9
IS  - 1
SP  - 181
EP  - 188
ER  - 
TY  - GEN
A1  - Liebig, Ferenc
A1  - Sarhan, Radwan Mohamed
A1  - Prietzel, Claudia Christina
A1  - Reinecke, Antje
A1  - Koetz, Joachim
T1  - “Green” gold nanotriangles: synthesis, purification by polyelectrolyte/micelle depletion flocculation and performance in surface-enhanced Raman scattering
N2  - The aim of this study was to develop a one-step synthesis of gold nanotriangles (NTs) in the presence of mixed phospholipid vesicles followed by a separation process to isolate purified NTs. Negatively charged vesicles containing AOT and phospholipids, in the absence and presence of additional reducing agents (polyampholytes, polyanions or low molecular weight compounds), were used as a template phase to form anisotropic gold nanoparticles. Upon addition of the gold chloride solution, the nucleation process is initiated and both types of particles, i.e., isotropic spherical and anisotropic gold nanotriangles, are formed simultaneously. As it was not possible to produce monodisperse nanotriangles with such a one-step procedure, the anisotropic nanoparticles needed to be separated from the spherical ones. Therefore, a new type of separation procedure using combined polyelectrolyte/micelle depletion flocculation was successfully applied. As a result of the different purification steps, a green colored aqueous dispersion was obtained containing highly purified, well-defined negatively charged flat nanocrystals with a platelet thickness of 10 nm and an edge length of about 175 nm. The NTs produce promising results in surface-enhanced Raman scattering.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 317 
KW  - morphological transformation
KW  - halide-ions
KW  - nanoparticles
KW  - shape
KW  - size
KW  - nanoprisms
KW  - vesicles
KW  - nanorods
KW  - silver
KW  - poly(ethyleneimine)
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-394430
SP  - 33561
EP  - 33568
ER  - 
TY  - GEN
A1  - Thete, Aniket
A1  - Rojas, Oscar
A1  - Neumeyer, David
A1  - Koetz, Joachim
A1  - Dujardin, Erik
T1  - Ionic liquid-assisted morphosynthesis of gold nanorods using polyethyleneimine-capped seeds
N2  - Seed-mediated gold nanorods with tunable lengths are prepared using new polyethyleneimine-capped gold nanoparticles synthesized in ionic liquid. The effect of polyethyleneimine and ionic liquid during nanorod growth is investigated and shows a marked effect on their final aspect ratio.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 245 
KW  - aqueous-solution
KW  - aspect-ratio
KW  - cationic surfactants
KW  - chemical-synthesis
KW  - delivery
KW  - metal nanoparticles
KW  - mixtures
KW  - shape
KW  - silver nanowires
KW  - surface-plasmon resonance
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-95196
SP  - 14294
EP  - 14298
ER  -