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  • 1.
    Larsson, Emanuel
    Hamburg University of Technology,Germany.
    De Carlo, Francesco (Contributor)
    Lilleodden, Erica (Contributor)
    Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg 21073, Germany.
    Storm, Malte (Contributor)
    Wilde, Fabian (Contributor)
    Kaixiong, Hu (Contributor)
    Müller, Martin (Contributor)
    Greving, Imke (Contributor)
    Nanoporous gold: a hierarchical and multiscale 3D test pattern for characterizing X-ray nano-tomography systems2019In: Journal of Synchrotron Radiation, ISSN 0909-0495, E-ISSN 1600-5775, Vol. 26, no 1Article in journal (Refereed)
    Abstract [en]

    Full-field transmission X-ray microscopy (TXM) is a well established technique, available at various synchrotron beamlines around the world as well as by laboratory benchtop devices. One of the major TXM challenges, due to its nanometre-scale resolution, is the overall instrument stability during the acquisition of the series of tomographic projections. The ability to correct for vertical and horizontal distortions of each projection image during acquisition is necessary in order to achieve the effective 3D spatial resolution. The effectiveness of such an image alignment is also heavily influenced by the absorption properties and strong contrast of specific features in the scanned sample. Here it is shown that nanoporous gold (NPG) can be used as an ideal 3D test pattern for evaluating and optimizing the performance of a TXM instrument for hard X-rays at a synchrotron beamline. Unique features of NPG, such as hierarchical structures at multiple length scales and high absorbing capabilities, makes it an ideal choice for characterization, which involves a combination of a rapid-alignment algorithm applied on the acquired projections followed by the extraction of a set of both 2D- and 3D-descriptive image parameters. This protocol can be used for comparing the efficiency of TXM instruments at different synchrotron beamlines in the world or benchtop devices, based on a reference library of scanned NPG samples, containing information about the estimated horizontal and vertical alignment values, 2D qualitative parameters and quantitative 3D parameters. The possibility to tailor the ligament sizes of NPG to match the achievable resolution in combination with the high electron density of gold makes NPG an ideal 3D test pattern for evaluating the status and performance of a given synchrotron-based or benchtop-based TXM setup.

  • 2.
    Wieland, D. C. F.
    et al.
    Institute for Materials Research, Germany; EMBL Hamburg, Germany.
    Zander, T.
    Institute for Materials Research, Germany.
    Garamus, V. M.
    Institute for Materials Research, Germany.
    Krywka, C.
    Institute for Materials Research, Germany.
    Dedinaite, A.
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials. KTH Royal Institute of Technology, Sweden .
    Claesson, P.
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials. KTH Royal Institute of Technology, Sweden.
    Willumeit-Römer, R.
    Institute for Materials Research, Germany.
    Complex solutions under shear and pressure: A rheometer setup for X-ray scattering experiments2017In: Journal of Synchrotron Radiation, ISSN 0909-0495, E-ISSN 1600-5775, Vol. 24, p. 646-652Article in journal (Refereed)
    Abstract [en]

    A newly developed high-pressure rheometer for in situ X-ray scattering experiments is described. A commercial rheometer was modified in such a way that X-ray scattering experiments can be performed under different pressures and shear. First experiments were carried out on hyaluronan, a ubiquitous biopolymer that is important for different functions in the body such as articular joint lubrication. The data hint at a decreased electrostatic interaction at higher pressure, presumably due to the increase of the dielectric constant of water by 3% and the decrease of the free volume at 300 bar.

  • 3.
    Wieland, D. C. Florian
    et al.
    Helmholtz-Zentrum Geestacht, Germany.
    Garamus, Vasil M.
    Helmholtz-Zentrum Geestacht, Germany.
    Zander, Thomas
    Helmholtz-Zentrum Geestacht, Germany.
    Krywka, C.
    Helmholtz-Zentrum Geestacht, Germany.
    Wang, M.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor. KTH Royal Institute of Technology, Sweden.
    Dédinaité, Andra A.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science. KTH Royal Institute of Technology, Sweden.
    Claesson, Per M.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
    Willumeit-Römera, Regine
    Helmholtz-Zentrum Geestacht, Germany.
    Studying solutions at high shear rates: A dedicated microfluidics setup2016In: Journal of Synchrotron Radiation, ISSN 0909-0495, E-ISSN 1600-5775, Vol. 23, no 2, p. 480-486Article in journal (Refereed)
    Abstract [en]

    The development of a dedicated small-angle X-ray scattering setup for the investigation of complex fluids at different controlled shear conditions is reported. The setup utilizes a microfluidics chip with a narrowing channel. As a consequence, a shear gradient is generated within the channel and the effect of shear rate on structure and interactions is mapped spatially. In a first experiment small-angle X-ray scattering is utilized to investigate highly concentrated protein solutions up to a shear rate of 300000 s-1. These data demonstrate that equilibrium clusters of lysozyme are destabilized at high shear rates.

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