(1) SWCNTs could partially destroy the preformed Aβ fibrils and form the Aβ-surrounded–SWCNTs conjugates, as well as reduce the β-sheet structures; (2) SWCNTs Dissociate the Preformed Aβ1−42 Fibrils and Form Large Aβ1−42 Surrounded SWCNTs Conjugates;