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Published in Chad A. Mirkin, Spherical Nucleic Acids, 2020
Soyoung E. Seo, Mary X. Wang, Chad M. Shade, Jessica L. Rouge, Keith A. Brown, Chad A. Mirkin
SAXS experiments were performed at sector 5-ID of the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) beamline at the Advanced Photon Source (APS) at Argonne National Laboratory. X-rays of wavelength 1.24 Å (10 keV) were used to probe the sample and the scattering angle was calibrated against a silver behenate standard. All SAXS data was collected at RT. To perform a SAXS measurement, roughly 80 µL of sample was loaded into 1.5 mm quartz capillary (Charles Supper Co.) and placed into a sample stage in the X-ray beam path. Two sets of slits were used to define and collimate the X-ray beam, and a pinhole was used. The X-ray beam cross section measured 200 µm in diameter and a 0.5 s exposure time was used. A CCD area detector was used and dark current frames were subtracted from all data.
Alkoxy-bromo-azulenes displaying ambient temperature smectic E-phases
Published in Liquid Crystals, 2021
Finn Schulz, Philipp Ehni, Bianca Wank, Alina Bauer, Wolfgang Frey, Sabine Laschat
Measurements of the X-ray diffraction were performed using a Bruker AXS Nanostar C with a ceramic tube generator (1500 W) having cross-coupled Goebel mirrors providing monochromatic Cu Kα radiation (1.5405 Å). Diffraction patterns were recorded with Bruker HI-STAR or VÅNTEC 500 detectors. Calibration was carried out using the diffraction pattern of silver behenate at room temperature. The compounds were examined in sealed glass capillaries from Hilgenberg GmbH (external diameter of 0.7 mm, wall thickness 0.01 mm). Measured values were analysed with the software SAXS from Bruker. The diffraction patterns were further processed using the software Datasqueeze, Origin and LCDiXray. For UV/Vis spectroscopy solvents were obtained in spectroscopic grade from the supplier and were not further purified. For absorption spectra, a Perkin Elmer Lambda 35 spectrometer was employed. Fits were obtained using origin software and the goodness of fit judged by the reduced χ2 value and residual plot shape.
The smectogenity as a crucial factor of broadening of the selective light reflection peak in cholesteric photopolymerizable mixtures
Published in Liquid Crystals, 2022
Valeriia Muraveva, Václav Kozmík, Michal Kohout, Andrew Manko, Alexey Piryazev, Dimitri Ivanov, Sergey Abramchuk, Martin Cigl, Alexey Bobrovsky
The X-ray scattering experiments were carried out with a Xenox WAXS/SAXS System diffractometer equipped with a Genix3D radiation source (wavelength 1.54 Å, beam size 300 × 300 μm2). Diffraction patterns were recorded using a two-dimensional Pilatus300k detector. The sample-to-detector distance was calibrated using several orders of the fundamental diffraction peak of silver behenate. The integration and processing of scattering curves was performed in the software package created by the authors in the Igor Pro software (Wavemetrics Ltd.) environment. The experiments were carried out in transmission geometry.