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Year of publication
- 2016 (213) (remove)
Document Type
- Article (156)
- Doctoral Thesis (33)
- Postprint (21)
- Other (2)
- Review (1)
Is part of the Bibliography
- yes (213)
Keywords
- X-ray structure (4)
- nanoparticles (4)
- Ion mobility spectrometry (3)
- Nanoparticles (3)
- biomaterials (3)
- configuration (3)
- conformation (3)
- copper(II) (3)
- crystal structure (3)
- crystallization (3)
Institute
- Institut für Chemie (213) (remove)
Kyriakos, Konstantinos ; Philipp, Martine ; Lin, Che-Hung ; Dyakonova, Margarita ; Vishnevetskaya, Natalya ; Grillo, Isabelle ; Zaccone, Alessio ; Miasnikova, Anna ; Laschewsky, Andre ; Müller-Buschbaum, Peter ; Papadakis, Christine M.
The aggregation kinetics of thermoresponsive core-shell micelles with a poly(N-isopropyl acrylamide) shell in pure water or in mixtures of water with the cosolvents methanol or ethanol at mole fractions of 5% is investigated during a temperature jump across the respective cloud point. Characteristically, these mixtures give rise to cononsolvency behavior. At the cloud point, aggregates are formed, and their growth is followed with time-resolved small-angle neutron scattering. Using the reversible association model, the interaction potential between the aggregates is determined from their growth rate in dependence on the cosolvents. The effect of the cosolvent is attributed to the interaction potential on the structured layer of hydration water around the aggregates. It is surmised that the latter is perturbed by the cosolvent and thus the residual repulsive hydration force between the aggregates is reduced. The larger the molar volume of the cosolvent, the more pronounced is the effect. This framework provides a molecular-level understanding of solvent-mediated effective interactions in polymer solutions and new opportunities for the rational control of self-assembly in complex soft matter systems.
Zhong, Qi ; Metwalli, Ezzeldin ; Rawolle, Monika ; Kaune, Gunar ; Bivigou Koumba, Achille Mayelle ; Laschewsky, Andre ; Papadakis, Christine M. ; Cubitt, Robert ; Wang, Jiping ; Müller-Buschbaum, Peter
The rehydration of thermoresponsive polystyrene-block-poly(methoxy diethylene glycol acrylate)-block-polystyrene (PS-b-PMDEGA-b-PS) films forming a lamellar microphase-separated structure is investigated by in situ neutron reflectivity in a D2O vapor atmosphere. The rehydration of collapsed PS-b-PMDEGA-b-PS films is realized by a temperature change from 45 to 23 degrees C and comprises (1) condensation and absorption of D2O, (2) evaporation of D2O, and (3) reswelling of the film due to internal rearrangement. The hydrophobic PS layers hinder the absorption of condensed D2O, and a redistribution of embedded D2O between the hydrophobic PS layers and the hydrophilic PMDEGA layers is observed. In contrast, the rehydration of semiswollen PS-b-PMDEGA-b-PS films (temperature change from 35 to 23 degrees C) shows two prominent differences: A thicker D2O layer condenses on the surface, causing a more enhanced evaporation of D2O. The rehydrated films differ in film thickness and volume fraction of D2O, which is due to the different thermal protocols, although the final temperature is identical.
Oertel, Jana ; Keller, Adrian ; Prinz, Julia ; Schreiber, Benjamin ; Huebner, Rene ; Kerbusch, Jochen ; Bald, Ilko ; Fahmy, Karim
Self-assembling biomolecules provide attractive templates for the preparation of metallic nanostructures. However, the intuitive transfer of the "outer shape" of the assembled macromolecules to the final metallic particle depends on the intermolecular forces among the biomolecules which compete with interactions between template molecules and the metal during metallization. The shape of the bio-template may thus be more dynamic than generally assumed. Here, we have studied the metallization of phospholipid nanodiscs which are discoidal particles of similar to 10 nm diameter containing a lipid bilayer similar to 5 nm thick. Using negatively charged lipids, electrostatic adsorption of amine-coated Au nanoparticles was achieved and followed by electroless gold deposition. Whereas Au nanoparticle adsorption preserves the shape of the bio-template, metallization proceeds via invasion of Au into the hydrophobic core of the nanodisc. Thereby, the lipidic phase induces a lateral growth that increases the diameter but not the original thickness of the template. Infrared spectroscopy reveals lipid expansion and suggests the existence of internal gaps in the metallized nanodiscs, which is confirmed by surface-enhanced Raman scattering from the encapsulated lipids. Interference of metallic growth with non-covalent interactions can thus become itself a shape-determining factor in the metallization of particularly soft and structurally anisotropic biomaterials.