There are many attempts to imrpove drug delivering systems. This work investigates a possible future way for targeted drug delivery. A gel out of water and oil phases that is able to change its structure in dependence of the pH value. We were able to create phases which have enclosed water compartments at around pH 2. This structure changes to an open hexagonal phase at pH 7.4 which corresponds to the physiological pH. Succesful migration experiments have been carried out. This promissing technique is undergoing further research.