A specimen chamber for soft X-ray spectromicroscopy on aqueous and liquid samples

Neuhäusler, U.; Jacobsen, Chris; Schulze, Darrell G.; Stott, D. A.; Abend, Sven

doi:10.1107/s0909049599015940

Cited by 46 publications

(20 citation statements)

References 6 publications

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“…A schematic representation of the STXM set-up is shown in Fig. 1 (image taken from Neuhä usler et al, 2000). HA and PAA suspensions were investigated in the fully hydrated state, sandwiched between two silicon nitride membranes (thickness 100 nm).…”

Section: Stxm/c 1s-nexafsmentioning

confidence: 99%

Humic acid metal cation interaction studied by spectromicroscopy techniques in combination with quantum chemical calculations

Plaschke¹,

Rothe²,

Armbruster³

et al. 2010

J Synchrotron Radiat

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Humic acids (HA) have a high binding capacity towards traces of toxic metal cations, thus affecting their transport in aquatic systems. Eu(III)-HA aggregates are studied by synchrotron-based scanning transmission X-ray microscopy (STXM) at the carbon K-edge and laser scanning luminescence microscopy (LSLM) at the (5)D(0) --> (7)F(1,2) fluorescence emission lines. Both methods provide the necessary spatial resolution in the sub-micrometre range to resolve characteristic aggregate morphologies: optically dense zones embedded in a matrix of less dense material in STXM images correspond to areas with increased Eu(III) luminescence yield in the LSLM micrographs. In the C 1s-NEXAFS of metal-loaded polyacrylic acid (PAA), used as a HA model compound, a distinct complexation effect is identified. This effect is similar to trends observed in the dense fraction of HA/metal cation aggregates. The strongest complexation effect is observed for the Zr(IV)-HA/PAA system. This effect is confirmed by quantum chemical calculations performed at the ab initio level for model complexes with different metal centres and complex geometries. Without the high spatial resolution of STXM and LSLM and without the combination of molecular modelling with experimental results, the different zones indicating a ;pseudo'-phase separation into strong complexing domains and weaker complexing domains of HA would never have been identified. This type of strategy can be used to study metal interaction with other organic material.

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Section: Stxm/c 1s-nexafsmentioning

confidence: 99%

Humic acid metal cation interaction studied by spectromicroscopy techniques in combination with quantum chemical calculations

Plaschke¹,

Rothe²,

Armbruster³

et al. 2010

J Synchrotron Radiat

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show abstract

“…However, experiments with samples in equilibrium with water vapor have not been published so far. Though, scanning transmission X-ray microscopy (STXM) has been performed in wet environmental samples before (Neuhausler, Jacobsen, Schulze, Stott, and Abend, 2000) and in a reaction cell for an in situ catalysis study (de Smit et al, 2008). The combination of single particle analysis with STXM, which is restricted to a few facilities worldwide that offers limited access only, exhibits the drawback that only a limited amount of particles can be studied.…”

mentioning

confidence: 99%

Direct observation of water uptake and release in individual submicrometer sized ammonium sulfate and ammonium sulfate/adipic acid particles using X-ray microspectroscopy

Zelenay

Ammann

Křepelová

et al. 2011

Journal of Aerosol Science

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“…We plan to mount the sample kinematically to the piezo stage and to also allow the use of a wet specimen chamber developed by U. Neuhäusler. 23 We will have room for accommodating three detectors on a motorized platform. Long range, encoded stepping stages will allow easy and reproducible switching among detectors.…”

Section: Design Of the New Stxmmentioning

confidence: 99%

<title>Applications and instrumentation advances with the Stony Brook scanning transmission x-ray microscope</title>

et al. 1998

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Scanning transmission X-ray microscopes (STXM) are well matched to the optics of high resolution monochromators, offer a variety of imaging modes and can minimize radiation damage to the specimen. We describe the Stony Brook STXM at the NSLS. This microscope is used for a variety of studies by many users; we briefly outline its use for studies of hydrated colloidal systems and for dark field microscopy on immunogold labeled specimens as examples. In order to keep pace with developments in zone plate optics, spectroscopy and a variety of imaging modalities, the microscope is being redesigned and its characteristics are discussed. Its primary x-ray detector will be a new multiwire proportional counter with high count rate capability.

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A specimen chamber for soft X-ray spectromicroscopy on aqueous and liquid samples

Abstract: A specimen chamber is described for soft X-ray spectromicroscopy of hydrated specimens and solutions. Applications include imaging and carbon edge spectroscopy of hydrated clay/polymer suspensions.

Cited by 46 publications

References 6 publications

Humic acid metal cation interaction studied by spectromicroscopy techniques in combination with quantum chemical calculations

Humic acid metal cation interaction studied by spectromicroscopy techniques in combination with quantum chemical calculations

Direct observation of water uptake and release in individual submicrometer sized ammonium sulfate and ammonium sulfate/adipic acid particles using X-ray microspectroscopy

<title>Applications and instrumentation advances with the Stony Brook scanning transmission x-ray microscope</title>

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