Synchrotron applications of pixel and strip detectors at Diamond Light Source

Marchal, J.; Tartoni, N.; Nave, C.

doi:10.1016/j.nima.2009.01.076

Cited by 14 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Immediately after mixing, the suspensions were continuously pumped via a peristaltic pump through a capillary in line with the synchrotron beam. Simultaneous 2D SAXS (collected with a RAPID detector) and 1D WAXS (collected with a HOTWAXS detector) patterns (λ = 1Å) were collected at one second time frames for the total reaction duration of ∼35 min. SAXS patterns were only collected for the pure ACC and SO 4(repl) experiments.…”

Section: Methodsmentioning

confidence: 99%

“…The crystallization of pure ACC (without additive) was performed both offline and online, using the same method and experimental setup, by rapidly mixing equal volumes of molar solutions of calcium chloride (1 M, CaCl 2 •2H 2 O, >99% purity) and sodium carbonate (1 M, Na 2 CO 3 , >99% purity). These pure ACC experiments were complemented with sets of experiments performed with either 10 mol % of the Na 2 CO 3 replaced by Na 2 SO 4 (SO 4(repl) experiments) as sulfate is thought to replace carbonate in some calcium carbonate phases 18 and with 10 mol % Na 2 SO 4 added to the Na 2 CO 3 solution (SO 4(add) experiments) to determine the effects of sulfate as a true additive. During mixing and throughout the whole experimental time, the suspensions were vigorously stirred to ensure rapid and continual homogenization.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Mechanistic Insights into the Crystallization of Amorphous Calcium Carbonate (ACC)

Bots

Benning

Rodríguez-Blanco

et al. 2012

Crystal Growth & Design

352

356

View full text Add to dashboard Cite

Many organisms use amorphous calcium carbonate (ACC) during crystalline calcium carbonate biomineralization, as a means to control particle shape/size and phase stability. Here, we present an in situ small-and wide-angle X-ray scattering (SAXS/WAXS) study of the mechanisms and kinetics of ACC crystallization at rapid time scales (seconds). Combined with offline solid and solution characterization, we show that ACC crystallizes to vaterite via a threestage process. First, hydrated and disordered ACC forms, then rapidly transforms to more ordered and dehydrated ACC; in conjunction with this, vaterite forms via a spherulitic growth mechanism. Second, when the supersaturation of the solution with respect to vaterite decreases sufficiently, the mechanism changes to ACC dissolution and vaterite crystal growth. The third stage is controlled by Ostwald ripening of the vaterite particles. Combining this information with previous studies, allowed us to develop a mechanistic understanding of the abiotic crystallization process from ACC to vaterite and all the way to calcite. We propose this is the underlying abiotic mechanism for calcium carbonate biomineralization from ACC. This process is then augmented or altered by organisms (e.g., using organic compounds) to form intricate biominerals. This study also highlights the applicability of in situ time-resolved SAXS/WAXS to study rapid crystallization reactions.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Mechanistic Insights into the Crystallization of Amorphous Calcium Carbonate (ACC)

Bots

Benning

Rodríguez-Blanco

et al. 2012

Crystal Growth & Design

352

356

View full text Add to dashboard Cite

show abstract

“…In practice, this means that there is a premium for the detector to have adequate angular resolution, a requirement that is met by CCD systems. The emerging forms of hybrid pixel detectors offer enormous potential in this application but so far only offer a pixel size that is too large for most applications [391]. The emerging X-ray free electron laser sources are driving a considerable amount of effort in this direction and small X-ray active pixel sensors are now beginning to emerge [392].…”

Section: Detectors For Coherent Imagingmentioning

confidence: 99%

Coherent methods in the X-ray sciences

Nugent

2010

Advances in Physics

451

340

View full text Add to dashboard Cite

X-ray sources are developing rapidly and their coherent output is growing extremely rapidly. The increased coherent flux from modern X-ray sources is being matched with an associated rapid development in experimental methods. This article reviews the literature describing the ideas that utilise the increased brilliance from modern Xray sources. It explores how ideas in coherent X-ray science are leading to developments in other areas, and vice versa. The article describes measurements of coherence properties and uses this discussion as a base from which to describe partially-coherent diffraction and X-ray phase contrast imaging, with its applications in materials science, engineering and medicine. Coherent diffraction imaging methods are reviewed along with associated experiments in materials science. Proposals for experiments to be performed with the new X-ray free-electron-lasers are briefly discussed. The literature on X-ray photon correlation spectroscopy is described and the features it has in common with other coherent X-ray methods are identified. Many of the ideas used in the coherent X-ray literature have their origins in the optical and electron communities and these connections are explored. A review of the areas in which ideas from coherent X-ray methods are contributing to methods for the neutron, electron and optical communities is presented.

show abstract

“…The MYTHEN detector system has been replaced with an upgraded version which now covers 120 and has been in operation since summer 2007 (Bergamaschi et al, 2009). Large MYTHEN detector systems and single modules have also been delivered by the Paul Scherrer Institut (PSI) to other synchrotron facilities (Marchal et al, 2009;Haverkamp & Wallwork, 2009). The detector is now marketed by the DECTRIS spin-off company (http://www.dectris.com/).…”

Section: Synchrotron Radiation Detectors For Powder Diffractionmentioning

confidence: 99%

The MYTHEN detector for X-ray powder diffraction experiments at the Swiss Light Source

et al. 2010

View full text Add to dashboard Cite

The MYTHEN single-photon-counting silicon microstrip detector has been developed at the Swiss Light Source for time-resolved powder diffraction experiments. An upgraded version of the detector has been installed at the SLS powder diffraction station allowing the acquisition of diffraction patterns over 120 in 2 in fractions of seconds. Thanks to the outstanding performance of the detector and to the calibration procedures developed, the quality of the data obtained is now comparable with that of traditional high-resolution point detectors in terms of FWHM resolution and peak profile shape, with the additional advantage of fast and simultaneous acquisition of the full diffraction pattern. MYTHEN is therefore optimal for time-resolved or dose-critical measurements. The characteristics of the MYTHEN detector together with the calibration procedures implemented for the optimization of the data are described in detail. The refinements of two known standard powders are discussed together with a remarkable application of MYTHEN to organic compounds in relation to the problem of radiation damage.

show abstract

Synchrotron applications of pixel and strip detectors at Diamond Light Source

Cited by 14 publications

References 7 publications

Mechanistic Insights into the Crystallization of Amorphous Calcium Carbonate (ACC)

Mechanistic Insights into the Crystallization of Amorphous Calcium Carbonate (ACC)

Coherent methods in the X-ray sciences

The MYTHEN detector for X-ray powder diffraction experiments at the Swiss Light Source

Contact Info

Product

Resources

About