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A method for synthesising mesoporous silica microparticles comprising the steps of:
producing mesoporous particles of silica with an average diameter of up to 50 µm by preparing a sol from an ammonium catalysed hydrolysis and condensation reaction of a pre-sol solution comprising a silica precursor and a structure directing agent which is a surfactant dissolved in a mixed solvent system comprising water and an alcohol which is one or more of ethanol, methanol, 1-propanol, 2- propanol, and 1-butanol;