I am the discoverer of Nanopathology. Now I am working in neuropathology. Can someone indicate me where I ?can find /buy samples of brain affected by neurological diseases

I have already analyzed (and published ) analyses of baby brain died for Sudden Infant Death Syndrome. these samples were full of inorganic nanoparticles. I analysed brain samples affected by Fronto Temporal Dementia and they are full of nanoparticles. Now I want to analyse brain samples  affected by Alzheimer and Parkinson by mans of a Fiedl Emission Gun Environmental Scanning Electron Microscope coupled with an X ray microsensor of a Energy Dispersive System.Can someone give me indications on how I can collect these samples? Now I am in a Foundation not in a hospital.