Optical and Electrical Properties of Oxide Multilayers

Han, Sangmin; Yu, Jieun; Lee, Sang Yeol

doi:10.4313/teem.2016.17.4.235

Cited by 3 publications

(1 citation statement)

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“…At a larger TiO 2 thickness, its resistance becomes too high, which would indicate that as it tends to infinity, the total resistance and conductivity would match those of the uncoated Ti-6Al-4V. A parallel resistance arrangement and a lower-resistance material acting as the dominant current path are generally associated with multi-layered materials [41,42].…”

Section: Analytical Approachmentioning

confidence: 99%

The Effect of the TiO2 Anodization Layer in Pedicle Screw Conductivity: An Analytical, Numerical, and Experimental Approach

Fonseca,

Goethel,

Vilas-Boas

et al. 2024

Bioengineering

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The electrical stimulation of pedicle screws is a technique used to ensure its correct placement within the vertebrae pedicle. Several authors have studied these screws’ electrical properties with the objective of understanding if they are a potential source of false negatives. As titanium screws are anodized with different thicknesses of a high electrical resistance oxide (TiO2), this study investigated, using analytical, numerical, and experimental methods, how its thickness may affect pedicle screw’s resistance and conductivity. Analytical results have demonstrated that the thickness of the TiO2 layer does result in a significant radial resistance increase (44.21 mΩ/nm, for Ø 4.5 mm), and a decrease of conductivity with layers thicker than 150 nm. The numerical approach denotes that the geometry of the screw further results in a decrease in the pedicle screw conductivity, especially after 125 nm. Additionally, the experimental results demonstrate that there is indeed an effective decrease in conductivity with an increase in the TiO2 layer thickness, which is also reflected in the screw’s total resistance. While the magnitude of the resistance associated with each TiO2 layer thickness may not be enough to compromise the ability to use anodized pedicle screws with a high-voltage electrical stimulator, pedicle screws should be the subject of more frequent electrical characterisation studies.

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Section: Analytical Approachmentioning

confidence: 99%