Characterization of particles created by laser-driven hydrothermal processing

Camargo, A. P. P.

doi:10.1016/j.matchar.2017.09.018

Cited by 3 publications

(6 citation statements)

References 13 publications

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“…3), surrogate samples contain small inclusions as compared to tektite with relatively large sub-millimeter sized inclusions. Previous work on tektites found some of the observed inclusions were rich in Fe and Ti [9], the same was found in this work. At higher magnifications of heat-treated surrogate samples, EDS analysis revealed Fe-rich inclusions.…”

Section: Microscopy and Microanalysissupporting

confidence: 90%

“…X-ray diffraction of naturally occurring tektite, as presented by Menon et al [9], shows regions with an amorphous phase and regions with high crystallinity; in contrast, every part of the specimens analyzed herein showed the same pattern, thus inhomogeneity in XRD was not observed in as-fabricated surrogates. Calcium carbonate (CaCO 3 ), aluminum silicate (Al 2 O 3 -SiO 2 ), and sodium aluminum silicate (Na 1.15 Al 1.15 Si 0.85 O 4 ) were identified as the dominant crystalline components in tektite.…”

Section: X-ray Diffractionmentioning

confidence: 48%

“…For both acid and base, EtOH and the chemical catalyst was added to DI water. Then the chemical precursors were added to solution 2A or 2B one by one until completely Table 1 Chemical composition of Indonesian tektite (Mama's Minerals, Albuquerque, NM, USA) measured by EDS [9] and compared to the average composition of tektite gathered from the Australasian strewn field [18] Chemical composition of Australasian tektites and microtektites were determined by atomic absorption spectroscopy and emission spectroscopy [19] and electron microprobe analysis [20] respectively Measured composition (wt%) from [9] Average composition (wt%) from [18][19][20] dissolved and/or a homogeneous mixture was reached. The final mixing step, both for 2A and 2B solutions, was to add finely crushed iron (III) nitrate nonahydrate and mix until completely dissolved.…”

Section: Fabricationmentioning

confidence: 99%

“…Initial testing of LDHP was performed on quartzite [6] and concrete [8] by Mariella et al Further studies conducted at the Naval Postgraduate School by Menon et al, was performed on naturally occurring minerals, tektite and obsidian [9,10]. The aim of the later work was to characterize LDHP processed material like trinitite, a glass which was formed during the first atomic bomb test.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of surrogate glasses with tektite composition

Foos

Ansell

Mariella

et al. 2019

J Radioanal Nucl Chem

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Surrogate glasses were fabricated by the sol-gel process aiming to produce compositions similar to naturally occurring tektite. The volatile species in the xerogel samples were removed by heat treatments. All products were characterized by thermal analysis, scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopic techniques. The elemental distribution in the surrogates was found to be more homogeneous than the one observed in natural materials. This work presents an alternative to generate target materials for the validation of techniques aimed to comminute samples in the nuclear forensics field, making the comparison between the pre and post-treatments more viable.

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Section: Microscopy and Microanalysissupporting

confidence: 90%

Section: X-ray Diffractionmentioning

confidence: 48%

Section: Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of surrogate glasses with tektite composition

Foos

Ansell

Mariella

et al. 2019

J Radioanal Nucl Chem

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“…Again, no cross-sectional measurements were taken to distinguish between a mechanism that formed colorless material versus a mechanism that simply removed any colored covering material to reveal pre-existing colorless material (see also, figure 4 of [2]). More recently, we observed qualitative enrichment of iron in the sub-μm particles that were dispersed from 1053 nm laser pulses on water-submerged obsidian, whose crater was again lined with colorless particles after hundreds of laser pulses [4].…”

mentioning

confidence: 90%

Laser-driven hydrothermal processing: a new, efficient technique to effect separation of silica from other oxides for analysis

Mariella¹,

Mills²

2018

Laser Phys. Lett.

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We observed what appeared to be an unstudied regime of laser-matter interactions, when modest-intensity, modest-fluence laser pulses struck weakly-absorbing, silica-rich material that was submerged in water: material was efficiently removed from the surface and colorless particles were left behind, decorating crater’s surface. One explanation for this color loss was a transient dissolution of the material, due to the pressure and temperature pulse caused by the laser absorption and thermally-driven expansion of the material. However, other explanations were possible. Here, we have studied this process with laser intensity and fluence so low that no crater was formed, when a sample of natural quartzite rock was submerged in deionized water and illuminated with 40 MW cm−2, 527 nm laser pulses. After one hundred laser pulses, the treated surface of the originally colored quartzite was colorless. We cut the quartzite in cross section and examined the colorless material on the surface with x-ray fluorescence. We report that the transition element Fe was found to be significantly depleted in this colorless layer, while Si was not. This supports the hypothesis that the laser exposure led to a transient hydrothermal dissolution of the material, followed by a recrystallization process of the SiO2 that preferentially released iron oxides into the submerging water.

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Rapid dissolution without elemental fractionation by laser driven hydrothermal processing

Durrant,

Brennecka,

Wimpenny

et al. 2024

Journal of Laser Applications

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Traditional dissolution of geologic samples often requires a significant time investment. Here, we present an alternative method for the dissolution of geologic materials using laser-driven hydrothermal processing (LDHP). LDHP uses laser energy directed onto a submerged sample, which increases the temperature and pressure at the liquid–sample interface and drives the hydrothermal dissolution coupled with photomechanical spallation, an ablative process. This uses focused 527 nm laser energy at 40 W average power, 1 kHz pulse repetition rate, and 115 ns pulse duration. When LDHP is performed on basalt geostandards (BCR-2 and BHVO-2) using the conditions outlined, we show that LDHP does not produce significant elemental fractionation and, thus, can be considered an alternative processing method to traditional mechanical crushing and acid digestion. Additionally, it is possible using LDHP to utilize the spatially confined beam to target and selectively isolate individual phases in a rock, potentially alleviating the need for mechanical separation of inclusions that are difficult to physically isolate. Furthermore, using this outlined method of LDHP, we demonstrate full dissolution of 120 mg of obsidian in 85 minu, meaning that LDHP is a potentially very useful method when sample processing is time sensitive.

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Characterization of particles created by laser-driven hydrothermal processing

Cited by 3 publications

References 13 publications

Fabrication of surrogate glasses with tektite composition

Fabrication of surrogate glasses with tektite composition

Laser-driven hydrothermal processing: a new, efficient technique to effect separation of silica from other oxides for analysis

Rapid dissolution without elemental fractionation by laser driven hydrothermal processing

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