| abstract |
The invention relates to a delivery device formed by an aggregation of a plurality of individual particles in a host fluid, wherein one or more individual particles of the plurality of individual particles has a density of less than the host fluid, preferably less than water, and a bonding property which permits the initially separate individual particles to aggregate in said host fluid, i.e. to be connected one to another in said host fluid, to form the aggregation. The invention further relates to a method for producing a plurality of individual particles and to a method of forming a delivery device from a plurality of particles in a host fluid at an aggregation site. |