The modular small-angle X-ray scattering data correction sequence

Pauw, Brian R.; Smith, Andrew J.; Snow, Tim; Terrill, Nicholas J.; Thünemann, Andreas F.

doi:10.1107/s1600576717015096

Cited by 104 publications

(108 citation statements)

References 34 publications

Supporting

Mentioning

101

Contrasting

Unclassified

Order By: Relevance

“…Data from both detectors have been processed using the DAWN software package 44 , according to the latest available procedures. 45 The data have been (in the following order) masked, corrected for counting time, darkcurrent, transmission, primary beam flux, background, thickness and solid angle, scaled to absolute units, followed by an azimuthal integration step.…”

Section: Methodsmentioning

confidence: 99%

Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1

Zorn

Yin

Lohstroh

et al. 2018

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Polymers with intrinsic microporosity are promising candidates for the active separation layer in gas separation membranes. Here, the vibrational density of states (VDOS) for PIM-1, the prototypical polymer with intrinsic microporosity, is investigated by means of inelastic neutron scattering. The results are compared to data measured for a more conventional high-performance polyimide used in gas separation membranes (Matrimid). The measured data show the characteristic low frequency excess contribution to VDOS above the Debye sound wave level, generally known as the Boson peak in glass-forming materials. In comparison to the Boson peak of Matrimid, that of PIM-1 is shifted to lower frequencies. This shift is discussed considering the microporous, sponge-like structure of PIM-1 as providing a higher compressibility at the molecular scale than for conventional polymers. For an annealed PIM-1 sample, the Boson peak shifts to higher frequencies in comparison to the un-annealed sample. These changes in the VDOS of the annealed PIM-1 sample are related to changes in the microporous structure as confirmed by X-ray scattering.

show abstract

Section: Methodsmentioning

confidence: 99%

Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1

Zorn

Yin

Lohstroh

et al. 2018

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…This pre-processing steps involved a number of corrections described by Pauw et al in refs. 19,20 and implemented into DAWN, as well as integration to 1D scattering curves and subtraction of an instrumental background (i.e. an "empty beamline" background).…”

Section: Saxs/waxs Data Collection and Processingmentioning

confidence: 99%

Nucleation Pathway of Calcium Sulfate Hemihydrate (Bassanite) from Solution: Implications for Calcium Sulfates on Mars

et al. 2020

View full text Add to dashboard Cite

CaSO 4 minerals (i.e. gypsum, anhydrite and bassanite) are widespread in natural and industrial environments. During the last several years, a number of studies have revealed that nucleation in the CaSO 4 -H 2 O system is non-classical, where the formation of crystalline phases involves several steps. Based on these recent insights we have formulated a tentative general model for calcium sulfate precipitation from solution. This model involves primary species that are formed through the assembly of multiple Ca 2+ and SO 4 2ions into nanoclusters. These nanoclusters assemble into poorly ordered (i.e. amorphous) hydrated aggregates, which in turn undergo ordering into coherent crystalline units.The thermodynamic (meta)stability of any of the three CaSO 4 phases is regulated by temperature, pressure and ionic strength with gypsum being the stable form at low temperatures and low to medium ionic strengths, and anhydrite the stable phase at high temperatures and lower temperature at high salinities. Bassanite is metastable across the entire phase diagram but readily forms as the primary phase at high ionic strengths across a wide range of temperatures, and can persist up to several months. Although the physicochemical conditions leading to bassanite formation in aqueous systems are relatively well established, nanoscale insights into the nucleation mechanisms and pathways are still lacking. To fill this gap, and to further improve our general model for calcium sulfate precipitation, we conducted in situ scattering measurements at small-and wide-angles (SAXS/WAXS) and complemented these with in situ Raman spectroscopic characterization.Based on these experiments we show that the process of formation of bassanite from aqueous solutions is very similar to the formation of gypsum: it involves the aggregation of small primary species into larger disordered aggregates, only from which the crystalline phase develops. These data thus confirm our general model of CaSO 4 nucleation and provide clues to explain the abundant occurrence of bassanite on the surface of Mars (and not on the surface of Earth).

show abstract

“…Solid samples were fixed in place, within the evacuated sample chamber, whilst liquid samples were flowed through a low-noise cell equipped with SiN windows. The resulting data has been processed and scaled to absolute units using the DAWN software package according to standardized procedures [14,15].…”

Section: Experimental Generalmentioning

confidence: 99%

Gold and silver dichroic nanocomposite in the quest for 3D printing the Lycurgus cup

Kool¹,

Dekker²,

Bunschoten³

et al. 2020

Beilstein J. Nanotechnol.

Self Cite

View full text Add to dashboard Cite

The Lycurgus cup is an ancient glass artefact that shows dichroism as it looks green when a white light is reflected on it and a red colouring appears when a white light is transmitted through it. This peculiar dichroic effect is due to silver and gold nanoparticles present in the glass. In this research we show the synthesis of dichroic silver nanoparticles and their embedding in a 3D printable nanocomposite. The addition of gold nanoparticles to the silver nanoparticle composite, gave a 3D printable nanocomposite with the same dichroism effect of the Lycurgus cup.

show abstract

The modular small-angle X-ray scattering data correction sequence

Cited by 104 publications

References 34 publications

Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1

Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1

Nucleation Pathway of Calcium Sulfate Hemihydrate (Bassanite) from Solution: Implications for Calcium Sulfates on Mars

Gold and silver dichroic nanocomposite in the quest for 3D printing the Lycurgus cup

Contact Info

Product

Resources

About