Charge Interaction Effects in Epoxy with Cation Exchanged Montmorillonite Clay and Carbon Nanotubes. Page: 32
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diameters, as well as individual MWCNT are comparable to the dimension of the
gallery height in MLS.
Nanotubes are either semiconducting or conducting along their length
depending on their chirality, or degree of twist along the cylindrical axis of the
tube. Half of naturally formed nanotubes are of the conductive variety. The
practical limit of conductivity in a carbon nanotube is essentially limited by the
continuity of the nanotube. In all cases, the external layer of the nanotube
determines the nature of the conductivity of electrons along their length. The
aspect ratio of as much as 1:1000 for single walled carbon nanotubes make them
ideal candidates to study space-charge separation effects for one-dimensional
rods.
Colloidal rod shaped particles may be stabilized by two means: (1) double
layers, and (2) by a sufficient number of contacts with rigid fiber extensions.
These extensions may be other nanotubes, or may be polymer brushes that
become completely immobilized by surrounding fibers, according to the review of
theory and experiment by Wierenga and Philipse [42]. This effect is known as
fiber caging. Fiber caging was described in detail by the statistical treatment of
Philipse and Verberkmoes [43, 44]. The latter work describes the size of a hard
sphere (or agglomerate) particle that will be unable to enter a cooperative fiber
network based on aspect ratios and the volume fractions of each type of particle.
A special case of particle electrophoresis is when colloidal suspensions of
rod shaped inductive particles express a movement due to an applied magnetic
field that acts through a resistant medium. The viscous (time-dependent)32
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Butzloff, Peter Robert. Charge Interaction Effects in Epoxy with Cation Exchanged Montmorillonite Clay and Carbon Nanotubes., dissertation, May 2005; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc4786/m1/45/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .