Investigation of contact-induced charging kinetics on variably modified glass surfaces

Triboelectric properties of calcium aluminosilicate glass surfaces

“…Based on the reported RST and ESG results, it appears as if charge transfer between the high SiO 2 ‐containing glasses (70%‐60%) and a metal interrogator follow an expected trajectory, where the glass accumulates negative net charge while the metal simultaneously accumulates positive net charge. These findings agree with our previous work on display glass compositions, which are of the same general family as those studied here . When SiO 2 content drops below ~60% in these glasses, the data suggest the standard convention may change fundamentally.…”

“…Figure A‐D show raw RST data collected under ~8%RH in order of decreasing SiO 2 content. A proton‐based charge transfer mechanism as proposed in ref . would likely have led to a more negative charge response with decreasing SiO 2 content, as opposed to a complete flipping of polarity, as we have observed here.…”

“…Rolling sphere testing was performed at variable relative humidity (~8%‐45%) using a similar approach as in previous work, with a few notable changes. Because the CAS patties were significantly thick (~20 mm), the RST apparatus had to be modified so that the magnet housing, driving motor assembly and electrode support could be suspended above the surface as opposed to below it.…”

“…Flat glass surfaces, as utilized in consumer electronics industries, are specifically prone to static charging due to their insulating nature and disproportionately large surface area. This can lead to a plethora of issues within the flat panel display manufacturing process, including, but not limited to, field‐induced electrostatic discharge failure of electronic components; particulate‐based contamination stemming from electrostatic attraction; and electrostatic stiction‐induced glass breakage during packaging and processing . Unfortunately, the physics that dictate both why and how (i) glass surfaces become charged, (ii) how charge carriers migrate once located on the surface, and (iii) how they discharge, are all incompletely understood.…”

“…The CAS ternary system was chosen for two primary reasons. First, because our initial experiments were conducted on complicated multicomponent glass compositions, important structural/compositional factors that may be related to surface charging remain difficult to differentiate. Here, we simplify to alkali‐free aluminosilicate compositions that are fundamentally analogous to display substrates.…”