TY - JOUR A1 - Li, Junbai A1 - Miller, Reinhard A1 - Wüstneck, Rainer A1 - Möhwald, Helmuth A1 - Neumann, A. W. T1 - News of pendant drop technique as a film balance at liquid/liquid interfaces Y1 - 1995 ER - TY - JOUR A1 - Li, Junbai A1 - Miller, Reinhard A1 - Krägel, Jürgen A1 - Kretzschmar, Günter A1 - Möhwald, Helmuth T1 - Dynamische Eigenschaften von Phospholipid-Monoschichten an Luft/Flüssig - und Flüssig/Flüssig Grenzflächen Y1 - 1995 ER - TY - JOUR A1 - Struth, Bernd A1 - Decher, Gero A1 - Schmitt, J. A1 - Hofmeister, Wolfgang A1 - Neißendorfer, Frank A1 - Pietsch, Ullrich A1 - Brezesinski, Gerald A1 - Möhwald, Helmuth T1 - Chemical modification of Topaz surfaces Y1 - 1999 SN - 0928-4931 ER - TY - JOUR A1 - Neißendorfer, Frank A1 - Pietsch, Ullrich A1 - Breszisinski, G. A1 - Möhwald, Helmuth T1 - Energy-dispersive reflectometry and diffractometry at the WLS of BESSY-I Y1 - 1999 ER - TY - JOUR A1 - Pietsch, Ullrich A1 - Grenzer, Jörg A1 - Geue, Thomas A1 - Neißendorfer, Frank A1 - Brezesinski, Gerald A1 - Symietz, Christian A1 - Möhwald, Helmuth A1 - Gudat, Wolfgang T1 - The energy dispersive reflectometer at BESSY II : a challenge for thin film analysis Y1 - 2001 SN - 0167- 5087 ER - TY - JOUR A1 - Bodenthin, Yves A1 - Grenzer, Jörg A1 - Lauter, Robert A1 - Pietsch, Ullrich A1 - Lehmann, Pit A1 - Kurth, Dirk G. A1 - Möhwald, Helmuth T1 - Temperature and time resolved x-ray scattering at thin organic films Y1 - 2002 ER - TY - JOUR A1 - Pietsch, Ullrich A1 - Panzner, Tobias A1 - Leitenberger, Wolfram A1 - Grenzer, Jörg A1 - Bodenthin, Th. A1 - Geue, Thomas A1 - Möhwald, Helmuth T1 - Coherence experiments at the energy-dispersive reflectometry beamline at BESSY II Y1 - 2003 ER - TY - JOUR A1 - Tedeschi, Concetta A1 - Li, L. A1 - Möhwald, Helmuth A1 - Spitz, Christian A1 - von Seggern, David A1 - Menzel, Ralf A1 - Kirstein, Stefan T1 - Engineering of layer-by-layer coated capsules with the prospect of materials for efficient and directed electron transfer N2 - We show a Lefschetz fixed point formula for holomorphic functions in a bounded domain D with smooth boundary in the complex plane. To introduce the Lefschetz number for a holomorphic map of D, we make use of the Bergman kernel of this domain. The Lefschetz number is proved to be the sum of the usual contributions of fixed points of the map in D and contributions of boundary fixed points, these latter being different for attracting and repulsing fixed points Y1 - 2004 ER - TY - JOUR A1 - Li, L. A1 - Möhwald, Helmuth A1 - Spitz, Christian A1 - von Seggern, David A1 - Mucke, M. A1 - Menzel, Ralf T1 - Long-lived photoinduced charge separation inside polarity gradient capsules Y1 - 2005 ER - TY - JOUR A1 - Pietsch, Ullrich A1 - Bodenthin, Yves A1 - Grenzer, Jörg A1 - Geue, Thomas A1 - Möhwald, Helmuth A1 - Kurth, Dirk G. T1 - Structure and temperature behavior of metallo-supramolecular assemblies N2 - A detailed structural analysis of a Langmuir-Blodgett (LB) multilayer composed of a polyelectrolyte-amphiphile complex (PAC) is presented. The PAC is self-assembled from metal ions, ditopic bis-terpyridines, and amphiphiles. The vertical structure of the LB multilayer is investigated by X-ray reflectometry. The multilayer has a periodicity of 57 A, which corresponds to an architecture of flat lying metallo-supramolecular coordination polyelectrolyte (MEPE) rods and upright-standing amphiphiles (dihexadecyl phosphate, DHP). In-plane diffraction reveals hexagonal packing of the DHP molecules. Using extended X-ray absorption fine structure (EXAFS) experiments, we prove that the central metal ion is coordinated to the terpyridine moieties in a pseudo-octahedral coordination environment. The Fe-N bond distances are 1.82 and 2.0 angstrom, respectively. Temperature resolved measurements indicate a reversible phase transition in a temperature range up to 55 degrees C. EXAFS measurements indicate a lengthening of the average Fe-N bond distance from 1.91 to 1.95 angstrom. The widening of the coordination cage upon heating is expected to lower the ligand field stabilization, thus giving rise to spin transitions in these composite materials Y1 - 2005 ER - TY - JOUR A1 - Pietsch, Ullrich A1 - Bodenthin, Yves A1 - Möhwald, Helmuth A1 - Kurth, Dirk G. T1 - Inducing spin crossover in metallo-supramolecular polyelectrolytes through an amphiphilic phase transition N2 - A phase transition in an amphiphilic mesophase is explored to deliberately induce mechanical strain in an assembly of tightly coupled metal ion coordination centers. Melting of the alkyl chains in the amphiphilic mesophase causes distortion of the coordination geometry around the central transition metal ion. As a result, the crystal field splitting of the d-orbital subsets decreases resulting in a spin transition from a low-spin to a high-spin state. The diamagnetic-paramagnetic transition is reversible. This concept is demonstrated in a metallo-supramolecular coordination polyelectrolyte-amphiphile complex self-assembled from ditopic bis-terpyridines, Fe(II) as central transition metal, and dialkyl phosphates as amphiphiles. The magnetic properties are studied in a Langmuir-Blodgett multilayer. The modularity of this concept provides extensive control of structure and function from molecular to macroscopic length scales and gives access to a wide range of new molecular magnetic architectures such as nanostructures, thin films, and liquid crystals Y1 - 2005 ER - TY - JOUR A1 - Kiel, Mareike A1 - Möhwald, Helmuth A1 - Bargheer, Matias T1 - Broadband measurements of the transient optical complex dielectric function of a nanoparticle/polymer composite upon ultrafast excitation JF - Physical review : B, Condensed matter and materials physics N2 - We determined experimentally the complex transient optical dielectric function of a well-characterized polyelectrolyte/gold-nanoparticle composite system over a broad spectral range upon short pulse laser excitation by simultaneously measuring the time-dependent reflectance and transmittance of white light pulses with femtosecond pump-probe spectroscopy. We extracted directly the ultrafast changes in the real and imaginary parts of the effective dielectric function, epsilon(eff)(r) (omega,t)and epsilon(eff)(i) (omega,t), from the experiment. This complete experimental set of information on the time-dependent complex dielectric function challenges theories modeling the transient dielectric function of gold particles and the effective medium. Y1 - 2011 U6 - https://doi.org/10.1103/PhysRevB.84.165121 SN - 1098-0121 VL - 84 IS - 16 PB - American Physical Society CY - College Park ER - TY - JOUR A1 - Li, Hongguang A1 - Babu, Sukumaran Santhosh A1 - Turner, Sarah T. A1 - Neher, Dieter A1 - Hollamby, Martin J. A1 - Seki, Tomohiro A1 - Yagai, Shiki A1 - Deguchi, Yonekazu A1 - Möhwald, Helmuth A1 - Nakanishi, Takashi T1 - Alkylated-C-60 based soft materials regulation of self-assembly and optoelectronic properties by chain branching JF - Journal of materials chemistry : C, Materials for optical and electronic devices N2 - Derivatization of fullerene (C-60) with branched aliphatic chains softens C-60-based materials and enables the formation of thermotropic liquid crystals and room temperature nonvolatile liquids. This work demonstrates that by carefully tuning parameters such as type, number and substituent position of the branched chains, liquid crystalline C-60 materials with mesophase temperatures suited for photovoltaic cell fabrication and room temperature nonvolatile liquid fullerenes with tunable viscosity can be obtained. In particular, compound 1, with branched chains, exhibits a smectic liquid crystalline phase extending from 84 degrees C to room temperature. Analysis of bulk heterojunction (BHJ) organic solar cells with a ca. 100 nm active layer of compound 1 and poly(3-hexylthiophene) (P3HT) as an electron acceptor and an electron donor, respectively, reveals an improved performance (power conversion efficiency, PCE: 1.6 + 0.1%) in comparison with another compound, 10 (PCE: 0.5 + 0.1%). The latter, in contrast to 1, carries linear aliphatic chains and thus forms a highly ordered solid lamellar phase at room temperature. The solar cell performance of 1 blended with P3HT approaches that of PCBM/P3HT for the same active layer thickness. This indicates that C-60 derivatives bearing branched tails are a promising class of electron acceptors in soft (flexible) photovoltaic devices. Y1 - 2013 U6 - https://doi.org/10.1039/c3tc00066d SN - 2050-7526 VL - 1 IS - 10 SP - 1943 EP - 1951 PB - Royal Society of Chemistry CY - Cambridge ER -