Effective medium electrical response model of carbon nanotubes cement-based composites

Autor: Oscar Mendoza, Enrique García-Macías, Daniel Andrés Triana Camacho, David Alejandro Miranda Mercado, Jorge Hernan Quintero Orozco
Rok vydání: 2022
Předmět:
Zdroj: Digibug. Repositorio Institucional de la Universidad de Granada
instname
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2022.128293
Popis: The electrical properties of carbon nanotubes (CNT) cement-based composites have been modeled in previous works by circuit models or homogenization theories. An alternative approach is the use of an effective medium theory with induced polarization: In this work, a new model based on the generalized effective medium theory of induced polarization (GEMTIP) with cylindrical inclusions is proposed. The presented results and discussion show its applicability to interpret the electrical impedance spectra of cylindrical cement samples doped with multi-walled CNTs (MWCNTs). The MWCNTs were dispersed in different media: one nonionic surfactant, two superplasticizers, a cationic type polycarboxylate ether, and an anionic type naphthalene sulfonate. Particle dispersion and their sizes were analyzed by Ultraviolet–Visible (UV–Vis) spectroscopy, and Scanning Electron Microscopy (SEM) measurements. Two electrode electrical impedance spectra were measured and analyzed by circuital models and the proposed GEMTIP model. The results demonstrate the efficiency of the proposed model in describing the Alternating Current (AC) response of cement/CNT composites irrespective of the dispersant agent used to elaborate the samples.
CBUA
Consejería de Transformación Económica, Conocimiento, Empresas Universidades de la Junta de Andalucía P18-RT-3128
MinCiencias 82779
Piezoresistividad en Pasta de Cemento con Adición de Nanopartículas de Oro o Materiales Carbonosos
Universidad de Granada
Instituto Colombiano de Crédito Educativo y Estudios Técnicos en el Exterior
Databáze: OpenAIRE
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