Hierarchische Strukturbildung von der molekularen Selbstorganisierung 2
Physikalische Chemie von Molekülen, Flüssigkeiten und Grenzflächen, Biophysikalische Chemie
Zusammenfassung der Projektergebnisse
This Project unraveled how small molecules, such as semifluorinatedalkanes, self-organize and form hierarchical structures, ranging over several orders of lengthscales from short-range intermolecular correlation (~ Å), formation of highly uniform nanodomains (~ 10 nm), to long-range correlation over ~ 1 µm. To precisely determine the shape, size and correlation of such self-assembled nanostructures, we employed grazing incidence small-angle X-ray scattering (GTSAXS). One of our unique achievements is to fully calculate the form factor F(q) arid the structure factor S(q) of the scattering signal collected by a two-dimensional detector. This enables us to precisely determine how subtle changes in molecular structures influence the individual domains as well as their collective behavior. In addition to the structural characterization, we quantitatively determined the mechanical properties of such self-organized nanodomains as a function of molecular structures. Here, we found that self-organized nanodomains of semifluorinatedalkanes could form two-dimensional physical gels even at zero surface pressures. This is clearly different from commonly used surfactants and polymers, which form gels only uder high compressions. Intringuingly, the selforganized nanodomains also exhibited a very prominent nonlinear viscoelasticity, suggesting that the unique properties of small molecules, such as weak cohesion and dipole repulsion, results in highly unique material properties. Finally, we modeled how the control of self-organization can potentially be used to fme-adjust the stability of microbubbles used in ultrasound image diagnostics. The obtained results have demonstrated that the precise quantification of structure-mechanics relationships as a function of molecular structures allows for the rational design of small molecules with optimal functions by tailoring their self-organizing capability.
Projektbezogene Publikationen (Auswahl)
- Influence of Semifluorinated Alkane Surface Domains on Phase Behavior and Linear and Nonlinear Viscoelasticity of Phospholipid Monolayers. Langmuir
S. Mielke, X. Liu, M.P. Krafft, M. Tanaka
(Siehe online unter https://doi.org/10.1021/acs.langmuir.9b03521) - Size, Shape and Lateral Correlation of Highly Uniform, Mesoscopic, Self-Assembled Domains of Fluorocarbon-Hydrocarbon Diblocks at the Air/Water Interface: A GISAXS Study. ChemPhysChem, 18, 2791 (2017)
M. Veschgini, W. Abuillan, S. Inoue, A. Yamamoto, S. Mielke, X. Liu, O. Konovalov, M.P. Krafft, M. Tanaka
(Siehe online unter https://doi.org/10.1002/cphc.201700325) - Two-Dimensional Physical Gels Can Exist even at Zero Surface Pressure at the Air/Water Interface - Rheology of Self-Assembled Domains of Small Molecules. Angew. Chem. Int. Edit 56, 12603 (2017)
M. Veschgini, T. Habe, S. Mielke, S. Inoue, X. Liu, M.P. Krafft, M. Tanaka
(Siehe online unter https://doi.org/10.1002/ange.201707009) - 2D Spherulites of a Semi-Fluorinated Alkaric: Controlled Access to Either Radial Or Ring-Banded Morphologies. ChemPhysChem 19, 29 (2018)
X. Liu, S. Mielke, C. Contal, D. Favier, A. Yamamoto, M. Tanaka, M.P. Krafft
(Siehe online unter https://doi.org/10.1002/cphc.201701064) - Emergence of Strong Nonlinear Viscoelastic Response of Semifluorinated Alkane Monolayers. Langmuir 34, 2489 (2018)
S. Mielke, T. Habe, M. Veschgini, X. Liu, K. Yoshikawa, M.P. Krafft, M. Tanaka
(Siehe online unter https://doi.org/10.1021/acs.langmuir.7b03997) - Neutron Scattering Reveals Water Confined in a Watertight Bilayer Vesicle. J. Am. Chem. Soc. 140, 11261 (2018)
W. Abuillan, A.S. Becker, B. Demé, T. Homma, H. Isobe, K. Harano, E. Nakamura, M. Tanaka
(Siehe online unter https://doi.org/10.1021/jacs.8b04066) - “Nonlinear Viscoelasticity of Highly Ordered, Two-Dimensional Assemblies of Metal Nanoparticles Confined at the Air/Water Interface’" Langmuir 3A, 13025-13034 (2018)
S. Masuda, S. Mielke, F. Amadei, A. Yamamoto, P. Wdaang, T. Taniguchi, K. Yoshikawa, K. Tama, M. Tanaka
(Siehe online unter https://doi.org/10.1021/acs.langmuir.8b02713) - Influence of Perfluorohexane-Enriched Atmosphere on Viscoelasticity and Structural Order of Self-Assembled Semifluorinated Alkanes at the Air-Water Interface. ChemPhysChem 20, 1698-1705 (2019)
S. Mielke, W. Abuillan, M. Veschgini, X. Liu, O. Konovalov, M.P. Krafft, M. Tanaka
(Siehe online unter https://doi.org/10.1002/cphc.201900316) - Long-Range Lateral Correlation between Self-Assembled Domains of Fluorocarbon-Hydrocarbon Tetrablocks by Quantitative GISAXS. ChemPhysChem 20, 898-904 (2019)
W. Abuillan, M. Veschgini, S. Mielke, X. Liu, O. Konovalov, M.P. Krafft, M. Tanaka
(Siehe online unter https://doi.org/10.1002/cphc.201800967)
