Chen, Xuelian; Schröder, Jan; Hauschild, Stephan; Rosenfeldt, Sabine; Dulle, Martin; Förster, Stephan
Simultaneous SAXS/WAXS/UV–Vis Study of the Nucleation and Growth of Nanoparticles: A Test of Classical Nucleation Theory
Despite the increasing interest in the applications of functional nanoparticles, a comprehensive understanding of the formation mechanism starting from the precursor reaction with subsequent nucleation and growth is still a challenge. We for the first time investigated the kinetics of gold nanoparticle formation systematically by means of a lab-based in…
Orientation behaviour of the minor director of homeotropically oriented nematic elastomers in mechanical fields
Brömmel, F.; Benzie, P.; Osterwinter, G. J.; Kramer, D.; Finkelmann, H.; Elston, S.; Hoffmann, A.
Soft Matter, 2013, vol 9, 9, pp. 2646–2651DOI:Visit the full articleBack to the overview
Shear deformation and ferroelectricity in chiral SmC* main-chain elastomers
Heinze, Patrick; Finkelmann, Heino
Macromolecules, 2010, vol 43, 16, pp. 6655–6665DOI:Visit the full articleBack to the overview
Mechanically induced tilt in smectic-A elastomers
Kramer, Dominic; Finkelmann, Heino
Recently it has been predicted that shear forces can unlock the director and the layer normal in smectic-A elastomers, leading to a smectic-C like tilt analogous to the electroclinic effect of chiral SA* phases. In order to investigate this phenomenon, we present detailed X-ray investigations of SA elastomers under shear,…
Solvothermal synthesis of hierarchical Eu 2 O 3 nanostructures templated by PS-b-PMAA: morphology control via simple variation of water contents
Xiao, Ying; Wang, Xiaoyan; Wagner, Thomas; Thiel, Jürgen; Yao, Yuan; Lin, Yichao; Metwalli, Ezzeldin; Liu, Rui; Butt, Hans Jürgen; Müller-Buschbaum, Peter; others
Journal of Materials Chemistry A, 2015, vol 3, 11, pp. 5789–5793DOI:Visit the full articleBack to the overview
Influence of the Main-Chain Configuration on the Mechanical Properties of Linear Aliphatic Polyesters
Pepels, Mark P. F.; Govaert, Leon E.; Duchateau, Rob
Linear aliphatic polyesters have been investigated extensively over the last decades. However, the relation between the configuration of the ester groups in the main chain and the mechanical properties is only poorly understood. Therefore, in this work the influence of the composition of these polymers on the morphology, mechanical properties…
Monodisperse PEGylated Spheres: An Aqueous Colloidal Model System
Ulama, Jeanette; Zackrisson Oskolkova, Malin; Bergenholtz, Johan
Fluorinated core?shell spheres have been synthesized using a novel semibatch emulsion polymerization protocol employing slow feeding of the initiator. The synthesis results in aqueous dispersions of highly monodisperse spheres bearing a well-defined poly(ethylene glycol) graft (PEGylation). Measurements are consistent with the synthesis achieving a high grafting density that moreover consists…
Organic Semiconductor Thin Films Deposited by Resonant Infrared Matrix-Assisted Pulsed Laser Evaporation: A Fundamental Study of the Emulsion Target
Liu, Yuankai; Atewologun, Ayomide; Stiff-Roberts, Adrienne D.
ABSTRACT Poly (3-hexylthiophene) (P3HT) thin films were deposited using emulsion-based, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) from emulsions containing different solvents and different alcohols, to investigate the impact of emulsion on film morphology. The atomic force microscopy (AFM) and grazing-incidence, wide angle x-ray scattering (GIWAXS) results show that…
3D titania photonic crystals replicated from gyroid structures in butterfly wing scales: approaching full band gaps at visible wavelengths
Mille, Christian; Tyrode, Eric C.; Corkery, Robert W.
3D titania photonic crystals are replicated from single gyroid structures found in the butterfly Callophrys rubi. Photonic crystals were characterised using SEM imaging, X-ray and Raman scattering and reflection spectroscopy. The overall symmetry and topology of the original single gyroid structures is replicated with high fidelity. Titania replicas display photonic…
Two processes of α-phase formation in polypropylene at high supercooling
Schawe, Jürgen E. K.; Vermeulen, Paul A.; van Drongelen, Martin
The non-isothermal and isothermal crystallization of different types of commercial polypropylenes (PP) are investigated by fast scanning calorimetry and wide-angle X-ray scattering. Typically, PP shows two different crystallization processes: below 55 °C the mesophase formation and at higher temperatures the α-phase formation. Here we report the first observation of an…