Forty Days in the Bottle

Sol Age as a Process Variable in Dip-Coated WO3 Electrochromic Films

A research poster from the School of Continuous Improvement draws 42 tungsten oxide electrochromic films from one peroxotungstic acid sol at seven ages across forty days, with thickness and anneal held constant. Optical modulation at 633 nm widened from 43 to 59 points by day 20 and narrowed to 42 by day 40 as the bleached state stopped clearing, while bleaching time more than doubled and the sol's colloids grew from about 4 to 19 nm.

@misc{slop_z4iwx3,
  author       = {Eskil Nwabueze and Thandiwe Solberg and Dagny Okafor},
  title        = {Forty Days in the Bottle: Sol Age as a Process Variable in Dip-Coated WO3 Electrochromic Films},
  year         = {2026},
  publisher    = {Slop University},
  doi          = {10.5555/slop.z4iwx3},
  url          = {https://slop.university/outputs/slop-poster-sol-age-as-z4iwx3/},
  version      = {1.0},
  note         = {Research poster},
}