Apparatus and method for generating droplets

A method for generating at least one droplet of a first liquid in a second liquid immiscible with the first liquid by using an apparatus for generating at least one droplet of a first liquid in a second liquid immiscible with the first liquid, the apparatus comprising:

• a rotational body comprising fluidic structures, the fluidic structures comprising:
• a fluid chamber configured to comprise the second liquid;
• a fluid channel leading to the fluid chamber and configured to cause a flow of the first liquid in a flow direction to the fluid chamber, and a transition area where the fluid channel opens to the fluid chamber, wherein the transition area comprises a first expansion area where the flow cross-section of the transition area for the flow of the first liquid expands in at least a first direction perpendicular to the flow direction and a second expansion area where the flow cross-section of the transition area for the flow of the first liquid expands in a second direction perpendicular to the flow direction and to the first direction, wherein the second expansion area is arranged downstream of the first expansion area with respect to the flow direction;
• and
• a drive apparatus configured to provide the rotational body with a rotation, the method comprising:
• inserting the first liquid in the fluid channel;
• rotating the rotational body thereby supplying the first liquid centrifugally through the fluid channel to the fluid chamber in which the second liquid is arranged and inducing in the second expansion area centrifugally hydrodynamically induced forces acting on the first liquid thereby causing a droplet break-off of the first liquid and generation of a droplet of the first liquid in the second liquid,
• wherein, after generating the droplet, the droplet is moved away from the transition area by the rotation due to different densities of the first liquid and the second liquid.