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

Mariella, Raymond P.; Mills, Bernice E.

doi:10.1088/1612-202X/aad87c

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

Journal Article · Thu Aug 23 00:00:00 EDT 2018 · Laser Physics Letters

DOI:https://doi.org/10.1088/1612-202X/aad87c· OSTI ID:1557033

Mariella, Raymond P. ^[1]; Mills, Bernice E. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

We report on 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. Yet, 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 bolsters 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0003525

OSTI ID:: 1557033

Alternate ID(s):: OSTI ID: 1429709
OSTI ID: 22987780

Report Number(s):: LLNL-JRNL--743402; 898309

Journal Information:: Laser Physics Letters, Journal Name: Laser Physics Letters Journal Issue: 10 Vol. 15; ISSN 1612-2011

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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