Slowing and stopping of chemical waves in a narrowing canal
  The propagation of a chemical wave in a narrow, cone-shaped glass capillary was investigated. When a chemical wave propagates from the wider end to the narrower end, it slows, stops, and then disappears. A phenomenological model that considers the surface effect of the glass is proposed, and this model reproduces the experimental trends. 
Hiroyuki Kitahata, Ryoichi Aihara, Yoshihito Mori, Kenichi Yoshikawa