A May 2026 arXiv preprint by Segev et al. demonstrates that hydrophobic surface treatment on amorphous silica particles enables 50-85% submicron dispersal via pneumatic systems, outperforming untreated powders by factors of 5-8. The lab experiments used atomic force microscopy to model adhesion forces and tested 300 nm versus 500 nm particles at air-to-powder ratios near 10:1, with scaling suggesting a modest aircraft fleet could achieve climate-relevant optical depths. As a preprint, these findings lack peer review and rely on controlled bench-scale tests without atmospheric turbulence or long-term stability data. This technical advance highlights a critical gap in mainstream SAI coverage: while sulfate aerosols face coagulation and ozone risks, solid particles introduce new uncertainties around heterogeneous chemistry and uneven stratospheric mixing that could amplify regional climate disruptions. Related work in Nature Climate Change (2021) on termination shock and a 2023 Geophysical Research Letters study on particle sedimentation underscore how such dispersal efficiencies might accelerate unilateral deployment by smaller actors, bypassing governance frameworks the original paper omits entirely. The research also underplays potential military dual-use implications of precise submicron delivery systems.