Nanocontainer-based corrosion sensing coating

Maia, Frederico; Tedim, João; Bastos, A.C.; Ferreira, M.G.S.; Zheludkevich, Mikhail L.

doi:10.1088/0957-4484/24/41/415502

Cited by 80 publications

(39 citation statements)

References 14 publications

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“…Strain sensing tests revealed that its electrical resistance increased linearly at relatively low levels of applied strain (e < 18,000 µe) and increased nonlinearly at higher strains (18,000 µe < e < 71,000 µe). On the other hand, Maia et al [6] developed mesoporous silica nanomaterialbased corrosion-sensitive coatings. The corrosion sensitive coatings were fabricated by loading mesoporous silica nanocontainers (Si-NC) with phenolphthalein (PhPh) embedded in transparent epoxy.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotube thin film strain sensor models assembled using nano- and micro-scale imaging

2017

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Nanomaterial-based thin films, particularly those based on carbon nanotubes (CNT), have brought forth tremendous opportunities for designing next-generation strain sensors. However, their strain sensing properties can vary depending on fabrication method, post-processing treatment, and types of CNTs and polymers employed. The objective of this study was to derive a CNT-based thin film strain sensor model using inputs from nano-/micro-scale experimental measurements of nanotube physical properties. This study began with fabricating ultra-lowconcentration CNT-polymer thin films, followed by imaging them using atomic force microscopy. Image processing was employed for characterizing CNT dispersed shapes, lengths, and other physical attributes, and results were used for building five different types of thin film percolation-based models. Numerical simulations were conducted to assess how the morphology of dispersed CNTs in its 2D matrix affected bulk film electrical and electromechanical (strain sensing) properties. The simulation results showed that CNT morphology had a significant impact on strain sensing performance.

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Section: Introductionmentioning

confidence: 99%

Carbon nanotube thin film strain sensor models assembled using nano- and micro-scale imaging

2017

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“…The encapsulation of a phenolphthalein dye as a corrosion sensor in mesoporous silica nanocontainers or multifunctional protective coatings has been reported. The phthalein‐based method is used in next generation corrosion‐sensing coatings and is useful for identifying corrosion degradation at an early stage .…”

Section: Industrial Applications Of Phthalein Dyesmentioning

confidence: 99%

Developments in the chemistry and applications of phthalein dyes. Part 1: industrial applications

Sabnis¹

2018

Coloration Technology

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This review describes the huge impact of phthalein dyes on multiple industries. Although phthalein dyes demonstrate several vital applications, there appears to be no review in the literature. Part 1 of this review focuses on developments in the chemistry and industrial applications of phthalein dyes. The industrial applications of phthalein dyes are grouped into building/construction applications, coating applications, electronic/electrical applications and miscellaneous applications. The importance of these dyes in various commercial products is also revealed, and patent analysis is provided in the appendix. The uses of phthalein dyes in various fields are important but their growing popularity with fascinating colour change features is particularly notable. Part 2 of the review will focus on the developments in the chemistry and biological applications of phthalein dyes.

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“…Over time, many corrosion sensors or probes based on electrochemical or nonelectrochemical theory have been developed and applied to corrosive environments in industry [112][113][114][115]. One suitable route to prevent the failure of the structure is the using of a corrosion control coating filled with pH-sensitive carriers [60][61][62][116][117][118][119][120][121]. The main cathodic reaction in the presence of oxygen involves the reduction of oxygen with formation of hydroxide ions that lead an increase in the local pH (eq.…”

Section: Ph-sensitive Self-release Microcapsulesmentioning

confidence: 99%

“…Maia et al developed a sensing coating by encapsulating PhPh in silica nanocontainers. The authors discovered that PhPh, instead of being released in to the coating, reacts with the hydroxide anions diffused within the capsule and turns them from colourless to pink [119]. Later, the same authors encapsulated PhPh in polyurea microcapsules dispersed in polyurethane based coating [120].…”

Section: Ph-sensitive Self-release Microcapsulesmentioning

confidence: 99%

6. Smart coatings for corrosion protection by adopting microcapsules

Palumbo¹

2015

Microencapsulation

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For decades, iron and steel have been two of the most important materials in our daily lives due to their good mechanical properties, availability and relatively reasonable cost. However, iron does not exist in nature as iron, but as a compound such as iron oxide. In order to get a usable material, these compounds must be refined and processed from their natural state. The conversion process (reduction, eq. 6.1) of iron from iron ore is undertaken by heating, therefore providing energy, with carbon under careful control, in order to prevent the reverse reaction. 2Fe 2 O 3 + 3C → 4Fe + 3CO 2 (6.1)According to the second law of thermodynamics [1, 2], there is a strong tendency for the system to move from order to disorder: its energy tends to be transformed from high energy states into lower levels energy states available, in order to reach the state of complete randomness and be unavailable for further work. Corrosion occurs due to this tendency of metals to recombine with components of the environment to reach its low energy state. In the case of iron, the metal tends to be oxidized into a reddish oxide, commonly known as rust, leading to a gradual destruction or deterioration of the metal [3-7]. All metals, with a few exceptions such as gold and silver, show this natural tendency to return to their lower energy state to form oxide and hydrate and therefore are prone to corrosion. Corrosion degradation is one of the main reasons for large industrial losses. One of the most suitable methods to protect metal for the external environment is the application of coatings on the metal's surface. Coatings are designed to protect the metal by physically isolating and preventing the diffusion of aggressive species towards the metal surface. However, coatings are prone to degrade, either because of the long exposure time -processes commonly known as weathering and ageing (e.g. moisture, UV radiation, thermo-oxidation, etc.) -or mechanical factors (e.g. damage due to impacts, scratches, defects, etc.). These chemical and mechanical degradation processes will eventually lead to the formation of microcracks and premature failure of the coating system. When the coating fails, the corrosion of the substrate is greatly accelerated. Repairs and maintenance of failed coatings are well-known to be both expensive and time consuming. Therefore, an active protection in addition to the time-limited passive protection is required. In order to prolong the service life of the metallic structures, scientists have developed a new class of intelligent polymeric coatings able to fully or partially regenerate their structural integrity resulting from external damage, without the help of any external Unauthenticated Download Date | 6/22/16 4:26 PM

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Nanocontainer-based corrosion sensing coating

Cited by 80 publications

References 14 publications

Carbon nanotube thin film strain sensor models assembled using nano- and micro-scale imaging

Carbon nanotube thin film strain sensor models assembled using nano- and micro-scale imaging

Developments in the chemistry and applications of phthalein dyes. Part 1: industrial applications

6. Smart coatings for corrosion protection by adopting microcapsules

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