The effect of silica nanoparticles on the dustiness of industrial powders

Garavito, Maria Camila Jiménez; Pacheco, Mariano Garrido; Witschger, Olivier; Bau, Sébastien; Gérardin, Fabien; Falk, Véronique

doi:10.1016/j.apt.2023.104105

Cited by 3 publications

(2 citation statements)

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“…Dry nanoparticles have been identified as a health risk to practitioners when applied as fingerprint powders owing to the greater inhalation risk posed by nanoscale materials compared to their micron-scale counterparts [9]. Furthermore, other studies of powdered materials combined with silica nanoparticles have exhibited increased dustiness indices [20].…”

Section: Safety Considerationsmentioning

confidence: 99%

“…The donors placed their fingerpads on the center of a microscope slide for 1-2 s.Microscope slides were cleaned prior to use, first by washing with dish soap and water, then by spraying with ethanol, and finally drying each slide using a fresh Kimwipe. The quality of visualization of TA B L E 1 Categorizing powder flow Behavior derived from angle of repose[20]. then assessed under both white light and phosphorescent afterglow inducing conditions (See Section 2.2.6).…”

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confidence: 99%

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Improving flow dynamics and storage longevity of a low‐cost phosphorescent fingerprint powder

Harrington,

Gee

2024

Journal of Forensic Sciences

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An inexpensive, commercially available doped strontium aluminate phosphor with long‐lived afterglow was prepared as a luminescent fingerprint dusting powder suited for challenging, highly patterned substrates; however, prolonged exposure to humidity was found to reduce that powder's affinity for fingermarks. Here, an enhanced preparation for synthesizing that fingerprint dusting powder is presented that prevents powder aggregation and loss of function upon exposure to humid environments. This was achieved by introducing a flow regulator during synthesis: hydrophobic silica SIPERNAT® D10 or SIPERNAT® D17. Increasing the hydrophobicity of the powder prevents aggregation by inhibiting the uptake of water, thereby improving the material's flow dynamics and transfer behavior from brush to fingermark. The angle of repose and flow characteristics made by the modified powders were quantified, with excellent affinity for fingermarks observed, even after being stored under 85% (±5%) humidity for 4 weeks. A preliminary comparison of the performance of the modified hydrophobic powders relative to the unmodified precursor revealed that more of the SIPERNAT® treated powder typically adhered to fingermarks while simultaneously imparting less background development. In addition, fewer clumps of particulate were observed in the developed fingermarks after addition of a hydrophobic flow regulator. This technical report outlines the updated method for synthesizing the fingerprint powder, with summarized flow performance results, and a demonstration of the modified powder's affinity for simulated fingermark evidence.

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Section: Safety Considerationsmentioning

confidence: 99%

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confidence: 99%