title: Size sorting of biological micro-particles by Newton-ring nano-gap device.
abstract: The size determination and the size sorting of micrometer-sized particles were carried out by using a piezo-controlled nano-gap. The nano-gap was built by combining a plano-convex lens and a flat glass plate. The fabricated gap had a gradient, while the center of the lens was narrow and the outer side was wide. When the sample solution was injected into the gap, a meniscus force carried the sample particles toward the center of the lens with solvent evaporation; then the individual particle was trapped at the specific position where the particle diameter was equal to the gap distance. The size determination ability of this new method was certified by using the standard polystyrene particles and the size measurements of DNA molecules and yeast cells were demonstrated.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Monjushiro
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hatta
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Watarai
mesh_terms: D004247:DNA / Q000737:chemistry; D004864:Equipment and Supplies; D036103:Nanotechnology; D010316:Particle Size
chemical_list: D004247:DNA