THESIS
2011
xii, 59 p. : ill. ; 30 cm
Abstract
Carbon nanotubes (CNTs) have been becoming increasingly important in a variety of fields within science and engineering. The transport properties of CNTs in a gas stream are critical because they are suspended in carrier gas in many applications. Drag and thermophoretic forces on CNTs in simple dilute gas can be formulated in free molecule regime (Kn1) on the basis of gas-kinetic theory. However, classical treatment subjected to micro-particles assumes gas-particle scattering to be rigid-body interaction, which is inadequate for nano-particles, including CNTs. In this thesis, it is aimed to offer a complete analytical picture of drag and thermophoretic forces on CNTs which have diameter of a few nano-meters or below in simple low density gas. The drag and thermophoretic coefficients of...[
Read more ]
Carbon nanotubes (CNTs) have been becoming increasingly important in a variety of fields within science and engineering. The transport properties of CNTs in a gas stream are critical because they are suspended in carrier gas in many applications. Drag and thermophoretic forces on CNTs in simple dilute gas can be formulated in free molecule regime (Kn>>1) on the basis of gas-kinetic theory. However, classical treatment subjected to micro-particles assumes gas-particle scattering to be rigid-body interaction, which is inadequate for nano-particles, including CNTs. In this thesis, it is aimed to offer a complete analytical picture of drag and thermophoretic forces on CNTs which have diameter of a few nano-meters or below in simple low density gas. The drag and thermophoretic coefficients of CNTs can be expressed in terms of a set of Chapman-Enskog collision integrals which account for both collision dynamics and interaction potential. The objective of this thesis is two-fold: (1) gas-CNT interaction potential is determined empirically; and (2) collision integrals associated with gas-CNT interaction potential are calculated and tabulated. Finally, molecular dynamics (MD) simulations are performed to directly calculate the drag force on CNTs and this is agreed well with theoretical predictions.
Post a Comment