Second Hyper-Zagreb Index of Titania Nanotubes and Their Applications

Abstract

Topological index is a numerical descriptor of a molecule based on a topological feature of the corresponding molecular graph, and it can correlate with chemical properties. This paper computes the second Hyper-Zagreb index and coindex of titania nanotubes and compares the second Hyper-Zagreb index with physicochemical properties such as density, molar volume, acentric factor and entropy through correlation coefficients.