218 citations · 500 across the 8 of their papers we have counts for
8 papers
Temperature-dependent EXAFS measurements of the Pb L3-edge allow quantification of the anharmonicity of the lead-halide bond of chlorine-substituted methylammonium (MA) lead triiodide
Götz Schuck, Daniel M. Többens, Dirk Wallacher +3
This article reports on studies of chlorine-substituted MAPbI3 using combined temperature-dependent XRD synchrotron and Pb-L3 edge EXAFS to analyze the anharmonicity of the lead ha…
A ferroelectric liquid crystal confined in cylindrical nanopores: Reversible smectic layer buckling, enhanced light rotation and extremely fast electro-optically active Goldstone excitations
Mark Busch, Andriy V. Kityk, Wiktor Piecek +7
The orientational and translational order of a thermotropic ferroelectric liquid crystal (2MBOCBC) imbibed in self-organized, parallel, cylindrical pores with radii of 10, 15, or 2…
Hydraulic Transport Across Hydrophilic and Hydrophobic Nanopores: Flow Experiments with Water and n-Hexane
Simon Gruener, Dirk Wallacher, Stefanie Greulich +2
We experimentally explore pressure-driven flow of water and n-hexane across nanoporous silica (Vycor glass monoliths with 7 or 10 nm pore diameters, respectively) as a function of…
Controlled pore formation on mesoporous single crystalline silicon nanowires: threshold and mechanisms
Stefan Weidemann, Maximilian Kockert, Dirk Wallacher +4
Silicon nanowires are prepared by the method of the two-step metal-assisted wet chemical etching. We have analyzed the structure of solid, rough and porous nanowire surfaces of bor…
Molecular dynamics of n-hexane: A quasi-elastic neutron scattering study on the bulk and spatially nanochannel-confined liquid
Tommy Hofmann, Dirk Wallacher, Maria Mayorova +3
We present incoherent quasi-elastic neutron scattering measurements in a wavevector transfer range from 0.4 AA^{-1} to 1.6AA^{-1} on liquid n-hexane confined in cylindrical, parall…
Capillary rise of water in hydrophilic nanopores
Simon Gruener, Tommy Hofmann, Dirk Wallacher +2
We report on the capillary rise of water in three-dimensional networks of hydrophilic silica pores with 3.5nm and 5nm mean radii, respectively (porous Vycor monoliths). We find cla…
Melting and freezing of argon in a granular packing of linear mesopore arrays
Christof Schaefer, Tommy Hofmann, Dirk Wallacher +2
Freezing and melting of Ar condensed in a granular packing of template-grown arrays of linear mesopores (SBA-15, mean pore diameter 8 nanometer) has been studied by specific heat m…
Quenching of lamellar ordering in an n-alkane embedded in nanopores
Patrick Huber, Dirk Wallacher, Johann Albers +1
We present an X-ray diffraction study of the normale alkane nonadecane C_{19}H_{40} embedded in nanoporous Vycor glass. The confined molecular crystal accomplishes a close-packed s…