title: Controlled generation of monodisperse discoid droplets using microchannel arrays.
abstract: We report a novel technique for generating geometrically confined droplets using a unique microstructure composed of a microchannel (MC) array and a shallow well. Silicon MC array devices were successfully used to generate monodisperse discoid droplets of oil-in-water (O/W) and W/O types by forcing a to-be-dispersed phase through channels into a well filled with a continuous phase. Monodisperse discoid droplets with sizes down to several micrometers were obtained by controlling the channel and well dimensions. The resultant discoid droplets formed a mostly close-packed array in the well. Monodisperse discoid droplets consisting of a silicone oil/water/sodium dodecyl sulfate system did not coalesce during the storage time of seven days. Additionally, MC array plates with many channels can be useful for increasing the droplet productivity of a single microfluidic device.
authors.affiliation: Food Engineering Division, National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan.
authors.forename: Isao
authors.initials: I
authors.lastname: Kobayashi
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Uemura
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Nakajima