Research Publications Authored by SLIIT Staff

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This collection includes all SLIIT staff publications presented at external conferences and published in external journals. The materials are organized by faculty to facilitate easy retrieval.

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Subject: search.filters.subject.Carbon nanotubes

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    PublicationOpen Access
    Efficient photocatalysis of carbon coupled TiO2 to degrade pollutants in wastewater – A review
    (Elsevier, 2022-08-27) Thambiliyagodage, C
    Water pollution caused by human activities is a monumental problem that the world is facing today. The use of polluted water for domestic, industrial, and agricultural applications creates severe hazardous issues. Therefore, decontamination of polluted water is greatly important. The advanced oxidation process is preferred to purify contaminated water as the pollutants are completely degraded to harmless products. TiO2 is the most widely researched photocatalyst due to its chemical stability, low cost and eco-friendliness. However, the use of TiO2 is limited as it is only sensitive to UV range due to its high band gap (3.0 eV for rutile) and the possible electron-hole pair recombination. TiO2 has been coupled with carbon-based materials to enhance photocatalytic activity by enhancing charge separation and visible light absorption. This review summarizes the recent use of TiO2 coupled to activated carbon, carbon nanotubes, graphene derivatives, and g-C3N4 to degrade different pollutants found in water including dyes, pesticides, pharmaceuticals, phenols and heavy metals. The advantages and disadvantages of using each carbon-based material are discussed. Further, the challenges and opportunities associated with all the materials are presented. Finally, recommendations and possible future outlooks are briefed in this review.
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    PublicationEmbargo
    Torsional buckling of carbon nanotubes based on nonlocal elasticity shell models
    (Elsevier, 2010-06-01) Khademolhosseini, F; Rajapakse, R. K. N. D; Nojeh, A
    This paper investigates size-effects in the torsional response of single walled carbon nanotubes (SWCNTs) by developing a modified nonlocal continuum shell model. The purpose is to facilitate the design of devices based on SWCNT torsion by providing a simple, accurate and efficient continuum model that can predict the corresponding buckling loads. To this end, Eringen’s equations of nonlocal elasticity are incorporated into the classical models for torsion of cylindrical shells given by Timoshenko and Donnell. In contrast to the classical models, the nonlocal model developed here predicts non-dimensional buckling torques that depend on the values of certain geometric parameters of the CNT, allowing for the inclusion of size-effects. Molecular dynamics simulations of torsional buckling are also performed and the results of which are compared with the classical and nonlocal models and used to extract consistent values of shell thickness and the nonlocal elasticity constant (e0). A thickness of 0.85 Å and nonlocal constant values of approximately 0.8 and 0.6 for armchair and zigzag nanotubes respectively are recommended for torsional analysis of SWCNTs using nonlocal shell models. The size-dependent nonlocal models together with molecular dynamics simulations show that classical shell models overestimate the critical buckling torque of SWCNTs and are not suitable for modeling of SWCNTs with diameters smaller than 1.5 nm.