Abstract
In this work, interaction and bond properties of anticancer drug doxorubicin (DOX), (6,6) armchair single-walled carbon nanotube (SWCNT), and hydroxyl- and carboxyl-functionalized SWCNT (ƒ-SWCNT) have been investigated based on DFT theory to design, improve and expand carbon nanotube (CNT) drug carriers for any biomedical system. Geometrical, structural, electrical, bonding and thermodynamic properties as well as equilibrium distances, adsorption energies, quantum molecular descriptors and frontier molecular orbitals or different drug arrangements on CNT at the highest equilibrium at WB97XD/6-31+G (d, p) level of theory at aqueous and gas phases were explored. Our calculations showed that hydrogen bonds between active sites of the spontaneous adsorption of doxorubicin (DOX) molecule and hydroxyl- and carboxyl-functionalized CNTs played a more important role than those with pristine CNTs in the adsorption and fixation of the studied complexes. Using quantum theory of atoms in molecules (QTAIMs) method, intermolecular interactions and corresponding descriptors at critical bonding points in aqueous and gas phases were also investigated. Evaluation of the results obtained from the natural bond orbital (NBO) analysis showed that the direction of electron movement was generally from drug molecule to CNT...
M.Ing. (Mechanical Engineering)