Triboelectrically Mediated Surface Reduction of Quartz Sand by Tumbling in Hydrogen Gas

TY - JOUR

T1 - Triboelectrically Mediated Surface Reduction of Quartz Sand by Tumbling in Hydrogen Gas

AU - Bregnhøj, Mikkel

AU - Wili, Nino

AU - Nielsen, Anders Bodholt

AU - Jensen, Svend J.Knak

AU - Nørnberg, Per

AU - Nielsen, Niels Chr

AU - Skibsted, Jørgen

AU - Finster, Kai

N1 - Publisher Copyright: © 2025 American Chemical Society.

PY - 2025/6/19

Y1 - 2025/6/19

N2 - We investigate the triboelectrically driven reduction of quartz sand when mechanically abraded (i.e., tumbled) in an atmosphere of hydrogen gas. Using diffuse reflectance IR spectroscopy, solid-state NMR spectroscopy, and quantum chemical computations, we show that hydrogen is incorporated into the abraded quartz sand in the form of silanol (Si-OH) and silane (Si-H) surface moieties. Furthermore, we use electron paramagnetic resonance (EPR) spectroscopy to characterize the paramagnetic radicals that are formed on the surface of the quartz sand particles during erosion. These radicals are stable when stored in ambient air for at least 6 months and they tolerate heating up to temperatures of ∼230 °C. The radicals are partially quenched by sonication in water.

AB - We investigate the triboelectrically driven reduction of quartz sand when mechanically abraded (i.e., tumbled) in an atmosphere of hydrogen gas. Using diffuse reflectance IR spectroscopy, solid-state NMR spectroscopy, and quantum chemical computations, we show that hydrogen is incorporated into the abraded quartz sand in the form of silanol (Si-OH) and silane (Si-H) surface moieties. Furthermore, we use electron paramagnetic resonance (EPR) spectroscopy to characterize the paramagnetic radicals that are formed on the surface of the quartz sand particles during erosion. These radicals are stable when stored in ambient air for at least 6 months and they tolerate heating up to temperatures of ∼230 °C. The radicals are partially quenched by sonication in water.

UR - https://www.scopus.com/pages/publications/105007499856

U2 - 10.1021/acs.jpcc.5c02082

DO - 10.1021/acs.jpcc.5c02082

M3 - Journal article

AN - SCOPUS:105007499856

SN - 1932-7447

VL - 129

SP - 10900

EP - 10910

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 24

ER -