The Effect of Different Oxygen Surface Functionalization of Carbon Nanotubes on the Electrical Resistivity and Strain Sensing Function of Cement Pastes
| Autor: | Rosa Navarro, Itahisa Marcelino Rodríguez, F.J. Baeza, M D Romero Sánchez, O. Galao, N. Arnáiz, B Calderón, B Del Moral, Emilio Zornoza, I Martín Gullón, Pedro Garcés |
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| Přispěvatelé: | Universidad de Alicante. Departamento de Ingeniería Civil, Universidad de Alicante. Departamento de Ingeniería Química, Durabilidad de Materiales y Construcciones en Ingeniería y Arquitectura, Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN), Grupo de Ensayo, Simulación y Modelización de Estructuras (GRESMES) |
| Rok vydání: | 2020 |
| Předmět: |
cement
Materials science General Chemical Engineering Carbon nanotubes Cement 0211 other engineering and technologies chemistry.chemical_element Mechanical properties 02 engineering and technology Carbon nanotube mechanical properties Oxygen Article Mecánica de los Medios Continuos y Teoría de Estructuras law.invention lcsh:Chemistry Stress (mechanics) law Electrical resistivity and conductivity 021105 building & construction sensing function General Materials Science Ingeniería de la Construcción Composite material Functionalization EU H2020 carbon nanotubes 021001 nanoscience & nanotechnology Sensing function Ingeniería Química lcsh:QD1-999 chemistry Agglomerate electrical properties Electrical properties functionalization Surface modification 0210 nano-technology Dispersion (chemistry) MASTRO project |
| Zdroj: | Nanomaterials Nanomaterials, Vol 10, Iss 807, p 807 (2020) RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) Volume 10 Issue 4 |
| ISSN: | 2079-4991 |
| DOI: | 10.3390/nano10040807 |
| Popis: | Different studies in the literature indicate the effectiveness of CNTs as reinforcing materials in cement&ndash matrix composites due to their high mechanical strength. Nevertheless, their incorporation into cement presents some difficulties due to their tendency to agglomerate, yielding a non-homogeneous dispersion in the paste mix that results in a poor cement&ndash CNTs interaction. This makes the surface modification of the CNTs by introducing functional groups on the surface necessary. In this study, three different treatments for incorporating polar oxygen functional groups onto the surface of carbon nanotubes have been carried out, with the objective of evaluating the influence of the type and oxidation degree on the mechanical and electrical properties and in strain-sensing function of cement pastes containing CNTs. One treatment is in liquid phase (surface oxidation with HNO3/H2SO4), the second is in gas phase (O3 treatment at 25 and 160 ° C), and a third is a combination of gas-phase O3 treatment plus NaOH liquid phase. The electrical conductivity of cement pastes increased with O3- and O3-NaOH-treated CNTs with respect to non-treated ones. Furthermore, the oxygen functionalization treatments clearly improve the strain sensing performance of the CNT-cement pastes, particularly in terms of the accuracy of the linear correlation between the resistance and the stress, as well as the increase in the gage factor from 28 to 65. Additionally, the incorporation of either non-functionalized or functionalized CNTs did not produce any significant modification of the mechanical properties of CNTs. Therefore, the functionalization of CNTs favours the de-agglomeration of CNTs in the cement matrix and consequently, the electrical conductivity, without affecting the mechanical behaviour. |
| Databáze: | OpenAIRE |
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