Durability sensor using low concentration carbon nano additives

Abstract

In this paper, nanocomposite durability sensors were developed in order to detect the diffusion of chemicals in real-time. Polymer nanocomposite based sensors usually consist of conductive nano-additives such as CNT (carbon nanotube), graphene, carbon black, silver nanoparticles, etc. However, these nanocomposite sensors use a high content of nanomaterials to ensure good conductivity. In this study, a special approach for a chemical sensor with a low concentration (0.1 wt%-2 wt%) carbon nano-additive was carried out and tested in the 1[M] H 3 PO 4 solution. Responding time and electrical resistance of each stage were analyzed against the nano-additives' concentration. The sensing behavior is represented by the decrease of electrical resistance from 100 MΩ level to 100 Ω level. A numerical multi-stage model was developed to evaluate the formation of the conductive network and its sensing property. The modeling work shows two major parameters affect the sensing behavior:(1) The aspect ratio of conductive nano-additive. (2) Diffusion coefficient ratio of different ions in different phases.

Novel wireless sensing design for composite durability study

“…Previously, we have explored the use of carbon nanomaterials and conjugated polymer in detecting the acid penetration in the polymer nanocomposites [13][14][15][16]. Based on our experimental and modeling results, we have confirmed that the change in conductivity of the polymeric matrix can be used as a primary indicator to monitor the acid penetration in the composite.…”

“…Previously, we have explored the diffusion of acid aqueous in epoxy based carbon nanocomposite [13,16]. We find that the diffusion of some ions is much faster than the others.…”

A review of the recent trend in the synthesis of carbon nanomaterials derived from oil palm by-product materials

“…Table 4 compiled the different properties between some selected CNMs. Thus, promoting and exploiting the CNMs into various applications in our daily life such as in sensors [91], catalyst [92], fillers in composites [93], and energy conversion and storage [94,95] to drug carries in cancer treatment [96]. Owing to the excellent performance of the CNMs, they have received a lot of attention from researchers.…”

A contactless characterization of CNT/Epoxy nanocomposites behavior under acid exposure

“…High corrosion resistance and chemical durability are imperative characteristics to withstand saline, corrosive and aggressive acids. Although polymer composite provides a high corrosion barrier and durability, unexpected structural failure before the designed service lifetime has been reported [12][13][14]. Direct contact with chemicals provokes unavoidable diffusion phenomena.…”

“…To identify and mitigate failure, structural health monitoring (SHM) techniques are deployed to evaluate the structural condition. Usually, SHM employs the implementation of sensors and actuators, however, chemical storage facilities often evaluate the structural health with weight and volume measurements, and colour-based methods [14,[17][18][19]. Although these methods can reasonably predict the structural state, they are mostly used post-use and impractical, as they require disassembly of the structure and complex machinery, resulting in time-consuming and expensive approaches.…”