Method for forming a body comprising at least one through-going passage

A method for forming a body comprising a plurality of through-going passages, said method comprising the steps of:

• a) providing a mixture comprising a plurality of liquid pockets inside a curable matrix, wherein the liquid pockets are in the form of droplets;
• b) forming said body by stretching the liquid pockets to extend from a first surface of said body to a second surface of said body by subjecting said mixture to a first alternating voltage having a first frequency, thereby forming said plurality of through-going passages wherein each through-going passage lacks curable matrix, and
• c) curing said curable matrix into a cured matrix,
• wherein the mixture of step a) is provided by application of a second alternating voltage having a second frequency to a mixture of liquid and said curable matrix,
• wherein each through-going passage of the plurality of through-going passages in cross-section has a shape of a column, an ellipsoid, a spheroid, an hourglass, or a meniscus.