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Vibrational Analysis of Carbon Nanoscroll tubes

Jadid Ahari, Ali | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52101 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi; Assempour, Ahmad
  7. Abstract:
  8. In recent year carbon nanostructures (CNS) has been the pinnacle of academic and industrial research. After development and refinement of better methods of controlled fabrication of high-quality CNS, these structures started substituting nanotubes in their renowned applications including nanochannels and nanocarriers. Due to the tunable core size of CNS using electric fields, they can be used as controlled ion channels and nanocarriers with controlled drug release as well as more dynamics oriented applications including nano-oscillators, nano-actuators and artificial muscle tissue. However lack of vibrational studies on CNS has hindered researchers in this path. In this thesis vibrational analysis is conducted on CNS using molecular structural method. In this method, CNS is modeled using a 3D structure of beam elements. These beam elements are used to model the carbon-carbon bonds. Mechanical properties of these beams is calculated by replacing field potential functions used in MD methods with strain energies of beam element. Atomic massed are point masses to simulate the carbon atoms. Van-der-Waals interactions of adjacent layers are considered as nonlinear spring elements and their respective stiffness curve is calculated using Lenard-Jones potential function. The effect of axial electric field is applied using induced dipole interactions between carbon atoms. This finite element model is then studied in different boundary conditions and for CNS with varying geometries. Studies show increase length and harsher boundary conditions result in higher natural frequencies. Natural frequencies and vibrational mode are approximately chiral independent. However applying electric field may increase or decrease the natural frequencies depending on their mode shapes
  9. Keywords:
  10. Carbon Nanoscroll ; Natural Frequency ; Modal Analysis ; Finite Element Method ; Vibrational Analysis

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