A sample carrier for measuring discrete powdered samples with an ITRAX XRF core scanner

2017 ◽  
Vol 47 (1) ◽  
pp. 58-62 ◽  
Author(s):  
Christian Ohlendorf
Keyword(s):  
Xrf Core Scanner ◽  
Sample Carrier

scholarly journals Surface cleaning and sample carrier for complementary high-resolution imaging techniques

2020 ◽  
Vol 15 (2) ◽  
pp. 021005
Author(s):  
Pietro Benettoni ◽  
Jia-Yu Ye ◽  
Timothy R. Holbrook ◽  
Federica Calabrese ◽  
Stephan Wagner ◽  
...  
Keyword(s):  
High Resolution ◽  
Imaging Techniques ◽  
Surface Cleaning ◽  
High Resolution Imaging ◽  
Resolution Imaging ◽  
Sample Carrier

Evaluation of Electrospray as a Sample Preparation Tool for Electron Microscopic Investigations: Toward Quantitative Evaluation of Nanoparticles

2017 ◽  
Vol 23 (1) ◽  
pp. 163-172 ◽  
Author(s):  
Johannes Mielke ◽  
Pavla Dohányosová ◽  
Philipp Müller ◽  
Silvia López-Vidal ◽  
Vasile-Dan Hodoroaba
Keyword(s):  
Sample Preparation ◽  
Deposition Efficiency ◽  
Number Concentration ◽  
Spherical Particles ◽  
Electron Microscopic ◽  
Electron Microscopes ◽  
Controlled Preparation ◽  
First Time ◽  
Preparation Techniques ◽  
Sample Carrier

AbstractThe potential of electrospray deposition, for the controlled preparation of particles for imaging in electron microscopes, is evaluated on various materials: from mono-modal suspensions of spherical particles to multimodal suspensions and to real-world industrial materials. It is shown that agglomeration is reduced substantially on the sample carrier, compared with conventional sample preparation techniques. For the first time, it is possible to assess the number concentration of a tri-modal polystyrene suspension by electron microscopy, due to the high deposition efficiency of the electrospray. We discovered that some suspension stabilizing surfactants form artifact particles during electrospraying. These can be avoided by optimizing the sprayed suspension.

A sequence of temporally separated element peaks; the fingerprint of a biogeochemical event initiated by sedimentary exhalative (SEDEX) brine expulsion

2021 ◽  
Author(s):  
Michiel Arts ◽  
Bradley Cramer ◽  
Mikael Calner ◽  
Christian Rasmussen ◽  
Alyssa Bancroft ◽  
...  
Keyword(s):  
High Resolution ◽  
Hydrothermal System ◽  
Type System ◽  
Ore Deposits ◽  
High Resolution Data ◽  
System A ◽  
Xrf Core Scanner ◽  
Extinction Event ◽  
Age Model ◽  
Resolution Data

<p>The Ireviken Biogeochemical Event (IBE) consists of the Ireviken Extinction Event (IEE) and is superseded by the Ireviken positive d13Ccarb Excursion (ICIE). During the Ireviken Extinction Event 80% of the conodont species and 50% of the trilobite species went extinct and Acritarchs, chitinozoans, graptolites, corals, and brachiopods communities were severely affected as well. Currently there are no indications that the Ireviken Biogeochemical event can be linked to a LIP or a bolide impact which are the usual triggers for most known biogeochemical events. The IBE has been tentatively linked to SEDEX brine expulsion, however convincing high-resolution data supporting the SEDEX brine expulsion theory was lacking.</p><p>The Altajme core from Gotland Sweden covers the entirety of the Ireviken Biogeochemical Event and using an ITRAX XRF core scanner  we were able to create a new dataset with a 1cm(~150-400 yr.) resolution. This dataset enables us to shed new light on the origin of the IBE and serves as a template for a cyclostratigraphic age model (using the detrital proxies of Ti and Al) which puts the IBE within a precise temporal framework.</p><p>The occurrence of peak values of Nb, Mn, Cu, Ba, Pb, Zn, As, Ag in the Altajme core follows the temporal sequence of element peaks which is characteristic for the cooling of a hydrothermal system. A Pb:Zn ratio of >1 and low Cu/(Zn+Pb) ratio categorises the hydrothermal system as being the sedimentary exhalative (SEDEX) brine expulsion type system. Through these results we can undoubtedly link the Ireviken Biogeochemical Event to a SEDEX brine expulsion. Numerous SEDEX style ore deposits of Proterozoic to Cenozoic age are known, but it has been difficult to connect them with similarly aged biogeochemical events.  This study demonstrates that through extremely high resolution XRF/element data we can observe the far-field signature of a SEDEX brine expulsion and thus showing us the way to recognize more biogeochemical events triggered by SEDEX brine expulsions. </p>

Artificial intelligence for discrimination of sediment facies based on high-resolution elemental and colour data from coastal sediments of the East Frisian Wadden Sea, Germany

2020 ◽  
Author(s):  
An-Sheng Lee ◽  
Dirk Enters ◽  
Sofia Ya Hsuan Liou ◽  
Bernd Zolitschka
Keyword(s):  
Machine Learning ◽  
High Resolution ◽  
Wadden Sea ◽  
Environmental Variability ◽  
Conventional Approach ◽  
Coastal Sediments ◽  
Supervised Machine Learning ◽  
Chemical Information ◽  
Xrf Core Scanner ◽  
Physical And Chemical

<p>Sediment facies provide vital information for the reconstruction of past environmental variability. Due to rising interest for paleoclimate data, sediment surveys are continually growing in importance as well as the amount of sediments to be discriminated into different facies. The conventional approach is to macroscopically determine sediment structure and colour and combine them with physical and chemical information - a time-consuming task heavily relying on the experience of the scientist in charge. Today, rapidly generated and high-resolution multiproxy sediment parameters are readily available from down-core scanning techniques and provide qualitative or even quantitative physical and chemical sediment properties. In 2016, an interdisciplinary research project WASA (Wadden Sea Archive) was launched to investigate palaeo-landscapes and environments of the Wadden Sea. The project has recovered 92 up to 5 m long sediment cores from the tidal flats, channels and off-shore around the island of Norderney (East Frisian Wadden Sea, Germany). Their facies were described by the conventional approach into glacioflucial sands, moraine, peat, tidal deposits, shoreface sediments, etc. In this study, those sediments were scanned by a micro X-ray fluorescence (µ-XRF) core scanner to obtain high-resolution records of multi-elemental data (2000 µm) and optical images (47 µm). Here we propose a supervised machine-learning application for the discrimination of sediment facies using these scanning data. Thus, the invested time and the potential bias common for the conventional approach can be reduced considerably. We expect that our approach will contribute to developing a more comprehensive and time-efficient automatic sediment facies discrimination.</p><p>Keywords: the Wadden Sea, µ-XRF core scanning, machine-learning, sediment facies discrimination</p>

Thermo-Gravimetric Analysis (TGA) of Combustion and Gasification of Styrene-Butadiene Copolymer (SBR)

2005 ◽  
Author(s):  
Marco J. Castaldi ◽  
Eilhann Kwon
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Combustion Efficiency ◽  
Unexpected Result ◽  
Gravimetric Analysis ◽  
Heating Rates ◽  
Thermo Gravimetric ◽  
Pure Nitrogen ◽  
Rubber Waste ◽  
Styrene Butadiene ◽  
Sample Carrier

An investigation has been initiated to determine the effects of various atmospheres (6.9% O2/N2, 21% O2/N2 (air), 30% O2/N2, 3% H2/N2 and pure N2) on the efficiency of gasifying or combusting rubber waste to produce synthesis gas or generate steam or power. This paper reports on the findings from a series of TGA experiments at various heating rates on styrene-butadiene copolymer (SBR), which is the main starting component for tire manufacturing. The results indicate that oxygen enhanced atmospheres have a significant effect on increasing combustion efficiency at the tested heating rates. A hydrogen-spiked atmosphere, surprisingly, did not have a significant effect on the gasification rates of SBR at any heating rate; in addition, this atmosphere resulted in a carbon residual that remained in the sample carrier, something that was not observed in the other atmospheres, including pure nitrogen. An unexpected result of the N2-O2 tests was the development of a plateau in the mass-loss versus temperature curves, at temperatures near 500°C.

A Sample Holder for X-Ray Powder Diffraction Studies of Flakiness and Block Sample

2013 ◽  
Vol 544 ◽  
pp. 433-436
Author(s):  
Hua Yong Zhang ◽  
Xiao Jian Liu ◽  
Hai Yan Sun ◽  
Chun Sheng Fan
Keyword(s):  
Solid State ◽  
Powder Diffraction ◽  
Low Cost ◽  
Sample Holder ◽  
X Ray Diffraction ◽  
X Ray ◽  
Block Sample ◽  
Powder Diffractometer ◽  
Analytical Results ◽  
Sample Carrier

Powder X-ray diffraction (XRD) is one of the primary techniques used to characterize solid state materials. But there is not a sample holder which can be fit into the sample carrier of the Bruker D8-Advance x-ray powder diffractometer for flakiness and block samples test. In this article, we will design, manufacture and evaluate a sample holder for flakiness and block samples. Materials of the holder are steel, glass and plasticine etc. The holder is low cost, easy to be processed, convenience to prepare the samples, and accurately obtain the best analytical results.

scholarly journals Effect of oxygen in sample carrier gas on laser-induced elemental fractionation in U–Th–Pb zircon dating by laser ablation ICP-MS

2014 ◽  
Vol 29 (5) ◽  
pp. 832-840 ◽  
Author(s):  
Jan Košler ◽  
Simon E. Jackson ◽  
Zhaoping Yang ◽  
Richard Wirth
Keyword(s):  
Laser Ablation ◽  
Elemental Fractionation ◽  
Zircon Dating ◽  
Carrier Gas ◽  
Ms Analysis ◽  
Icp Ms ◽  
Effect Of Oxygen ◽  
Sample Carrier

The presence of oxygen during U–Th–Pb LA ICP-MS analysis of zircon controls the laser-induced elemental fractionation and ICP-MS sensitivity.

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