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Abstract

Described is a method for obtaining hollow particles, having a particle wall and a particle lumen, the particle having dimensions of between 1 nm and 100 μm, from a mixture comprising a liquid medium comprising at least one colloid or solute, the method comprising freezing said mixture and lyophilising the obtained frozen mixture, characterised in that a volume of at least 0.1 μl of the mixture is subjected to a freezing step comprising: (a) (1) quench freezing the mixture resulting in a quench frozen mixture, and (2) incubating said quench frozen mixture at a temperature above the quench freezing temperature and below the melting point of the liquid medium, orb) (1) reducing the temperature of the mixture at a rate of 1 to 100° C./minute to below the freezing temperature of the mixture and (2) incubating said frozen mixture at a temperature above the temperature of the mixture and below the melting point of the liquid medium. Further, hollow particles obtainable by the said method, compositions comprising said hollow particles and uses thereof are described.

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First Claim