Quantum dot
Quantum dots conjugated with DNA are subject to electrostatic repulsion and Van der Waals forces which affect the colloidal stability of the quantum dot-DNA conjugates. Binding DNA to the surface of a quantum dot increases the stability of the quantum dots. The DNA chains provide more electrostatic repulsion than the surface of the quantum dots, which prevents them from aggregating and falling out of solution. The colloidal stability is estimated from the total interaction energy between two particles which calculated by the DLVO equation