Abstract
The purpose of this study is to analyse the effective method of dispersion of MWCNTs for the application in cement-based composites. Efficient dispersion of Carbon Nanotubes (CNTs) is one of the most challenging and crucial aspects for the application in cement-based composite. In this study, two different CNTs, pristine and functionalized (p-MWCNTs and f-MWCNTs) were dispersed in de-ionized water using different surfactants, Polyvinylpyrrolidone (PVP k-30 and PVP k-90) & Sodium Dodecyl Sulfate (SDS) and conducted a comparative investigation of the effects. Dispersion using an ultrasonic, treatment with surfactant and integrated method of both were analysed. The influence of CNTs dispersion on the electrical conductivity of the aqueous solution and to cement composites has been studied. Among the surfactant used PVPk-30 provide the best-dispersing effect while PVPk-30+SDS shows an extraordinary enhancement of conductivity of an aqueous solution. Analysis of electrical conductivity of Various % CNTs’ loaded specimen (0,0.001,0.003,0.025 wt.%) with different curing period (3,7,14,21,28 days) showed that the electrical resistivity decreases with CNTs’ loading. Dispersion effect of surfactant on p-MWCNTs and f-MWCNTs has been characterized by Ultraviolet-visible Spectroscopy (UV-Vis) and electrical resistivity measurement is carried for investigation and comparison on enhancement of electrical conductivity.
Highlights
Beginning with the first evidence of the tubular hollow graphitic nature of nano-sized carbon filaments of 50 nm in diameter by Monthioux and Kuznetsov [1], which dates back as far as 1952
It is because PVP k-90 having a higher molecular weight a long polymer chain could have wrapped more than a single MWCNTs together or single nanotube wrapped entirely, which leaded to higher surface coverage compromising the formation of a conductive route
For the set of an experiment which was conducted taking two different types of CNTs with 0.04 wt.% loading, CNTs/Surfactant ratio 1:05 and followed by ultrasonic treatment (50% magnitude, 450 w) of an aqueous solution
Summary
Beginning with the first evidence of the tubular hollow graphitic nature of nano-sized carbon filaments of 50 nm in diameter by Monthioux and Kuznetsov [1], which dates back as far as 1952. Their further rediscoveries, including the high impact report on the synthesis of hollow carbon molecules & their crystal structures by arc discharge evaporation method for the first time by Japanese researcher Sumio Iijima published in 1991 [2], the field of CNTs continues to be one of the hottest topics in nanoscience and nanotechnology which has been already around 30 years. Two models can be used to describe the structure of MWCNTs, Russian model explains as sheets of graphite which are arranged in concentric cylinders within larger single SWCNTs while the parchment model describes as a single sheet of graphite rolled in around itself, resembling a scroll of parchment or rolled paper
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