Cellulose microfibers (CMFs) as a smart carrier for autonomous self-healing in epoxy coatings

Nawaz, Muddasir; Habib, Sehrish; Khan, Arfaat; Shakoor, Abdul; Kahraman, Ramazan

doi:10.1039/c9nj06436b

Cited by 34 publications

(7 citation statements)

References 36 publications

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“…The electrochemical performance of the plain epoxy coatings (reference coating) has already been previously reported in our recent works. 29,72 Contrary to the scratched reference coating, whose global impedance decreases with the immersion time, SLPC showed increasing global impedance values over the 7 days of immersion time, as shown in Figure 10A. For example, after the 1st day of immersion, the global impedance observed was approximately 6 MΩ cm 2 , which is higher than that of the reference one and further increments after the 3rd day, reflecting the gradual release initiation of the loaded inhibitor from the HNTs at the scratched zone.…”

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confidence: 99%

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Hassanein

Khan

Fayyad

et al. 2021

ACS Appl. Mater. Interfaces

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Smart polymeric composite coatings demonstrating multilevel self-healing characteristics were developed and characterized. The pHresponsive smart carriers were synthesized by loading halloysite nanotubes (HNTs) with the benzotriazole corrosion inhibitor (BTA) using the vacuum cycling method, referred to as (BTA-loaded HNTs). Similarly, mechanically triggered melamine urea-formaldehyde microcapsules encapsulated with the boiled linseed oil-self-healing agent (LO) denoted as (MUFMCs) having an average size of a ∼120 μm diameter with a wall thickness of ∼1.84 μm were synthesized by the in situ polymerization technique. The newly designed double-layered smart polymeric composite coatings (DLPCs) were developed by mixing 3 wt % BTA-loaded HNTs with epoxy and applying it on the clean steel substrate to form a primer layer. After its complete curing, a top layer of epoxy containing 5 wt % of MUFMCs was deposited on it. For an exact comparison, single-layer polymeric composite coatings (SLPCs) containing 3 wt % BTA-loaded HNTs were also developed. The Fourier transform infrared radiation spectra of MUFMCs and BTA-loaded HNTs indicate the existence of all desired functional groups, confirming the presence of loaded chemical species such as LO and BTA into the smart carriers. Thermogravimetric analysis (TGA) indicates that ∼18% BTA is successfully loaded into HNTs. Quantitative UV-spectroscopic analysis indicates a pH-responsive release of BTA from BTA-loaded HNTs, which is time-dependent, attaining its maximum value of ∼ 90% in an acidic medium after 30 h. Electrochemical impedance spectroscopy analysis conducted in 3.5 wt % NaCl solution at room temperature for different immersion times reveals that SLPC exhibits the maximum chargetransfer resistance (R ct ) of 55.47 GΩ cm 2 after the 7th day of immersion, and then, a declining trend is observed, reaching 26.6 GΩ cm 2 after the 9th day. However, in the case of DLPC, the R ct values show a continuous increment, attaining a maximum value of 82.11 GΩ cm 2 after the 9th day of immersion. The improved performance of DLPC can be ascribed to the efficient triggering of the individual carriers in the isolated matrices, resulting in the release of LO and BTA to form individual protective films at the damaged area due to the oxidative polymerization process and triazoles' ability of passive film formation on the substrate, respectively. The tempting self-healing properties of DLPCs justify their decent role for long-term corrosion protection in many industrial applications.

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confidence: 99%

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Hassanein

Khan

Fayyad

et al. 2021

ACS Appl. Mater. Interfaces

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“…In the literature, many categories of coatings have been described to avoid steel constituents corrosion; coatings based on polymeric materials have been the most extensively utilized owing to their excellent barrier characteristics [7]. The corrosion protection of polymeric coatings results from the coating blocks' influence and the protection of the corroding locations [8]. The first needs the application of impermeable and thick coatings that avoid the interaction of the metal surface with the aggressive medium (15% HCl solution) [9], while the second includes the distribution of anti-deterioration pigments that hinder corrosion when the defensive barrier influence vanishes [10].…”

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confidence: 99%

Experimental and In-Silico Computational Modeling of Cerium Oxide Nanoparticles Functionalized by Gelatin as an Eco-Friendly Anti-Corrosion Barrier on X60 Steel Alloys in Acidic Environments

et al. 2022

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An eco-friendly and a facile route successfully prepared novel cerium oxide nanoparticles functionalized by gelatin. The introduced CeO2@gelatin was investigated in terms of FE-SEM, EDX, TEM, chemical mapping, FT-IR, and (TGA) thermal analyses. These characterization tools indicate the successful synthesis of a material having CeO2 and gelatin as a composite material. The prepared composite CeO2@gelatin was used as an environment-friendly coated film or X60 steel alloys in acidizing oil well medium. Moreover, the effect of CeO2 percent on film composition was investigated. LPR corrosion rate, Eocp-time, EIS, and PDP tools determined the corrosion protection capacity. The CeO2@gelatin composite exhibited high protection capacity compared to pure gelatin; in particular, 5.0% CeO2@gelatin coating film shows the highest protection capacity (98.2%), with long-term anti-corrosive features. The % CeO2@gelatin-coated films formed the protective adsorbed layer on the steel interface by developing a strong bond among nitrogen atoms in the CeO2@gelatin film and the electrode interface. Surface morphology using FESEM measurements confirmed the high efficiency of the fabricated CeO2@gelatin composite on the protection X60 steel alloys. DFT calculations and MC simulations were explored to study the relations between the protection action and the molecular construction of the coated systems, which were in good alignment with the empirical findings.

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“…Cellulose nanofibrils (CNFs) are a nanoscale derivative of cellulose that are capable of forming dense film/coating networks (through intramolecular hydrogen bonds) with high mechanical properties and low oxygen permeability. , To date, the functionality of CNFs as a barrier coating has primarily focused on paper/board applications, , whereas its application for the protection of metallic surfaces is limited. The primary reason for this limitation could be due to the hydrophilic/hygroscopic nature of cellulose, although a few studies have exploited the water-swelling behavior of cellulose-containing coatings as a basis for release of corrosion inhibitors or healing agents. − …”

Section: Introductionmentioning

confidence: 99%

Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles

Dastpak

Ansell

Searle

et al. 2021

ACS Appl. Mater. Interfaces

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This study presents a process for preparation of cellulose−lignin barrier coatings for hot-dip galvanized (HDG) steel by aqueous electrophoretic deposition. Initially, a solution of softwood kraft lignin and diethylene glycol monobutyl ether was used to prepare an aqueous dispersion of colloidal lignin particles (CLPs) via solvent exchange. Analysis of the dispersion showed that it comprised submicron particles (D = 146 nm) with spherical morphologies and colloidal stability (ζ-potential = −40 mV). Following successful formation, the CLP dispersion was mixed with a suspension of TEMPO-oxidized cellulose nanofibers (TOCN, 1 and 2 g•L −1 ) at a fixed volumetric ratio (1:1, TOCN− CLPs), and biopolymers were deposited onto HDG steel surfaces at different potentials (0.5 and 3 V). The effects of these variables on coating formation, dry adhesion, and electrochemical properties (3.5% NaCl) were investigated. The scanning electron microscopy results showed that coalescence of CLPs occurs during the drying of composite coatings, resulting in formation of a barrier layer on HDG steel. The scanning vibrating electrode technique results demonstrated that the TOCN−CLP layers reduced the penetration of the electrolyte (3.5% NaCl) to the metal−coating interface for at least 48 h of immersion, with a more prolonged barrier performance for 3 V-deposited coatings. Additional electrochemical impedance spectroscopy studies showed that all four coatings provided increased levels of charge transfer resistance (R ct )compared to bare HDG steelalthough coatings deposited at a higher potential (3 V) and a higher TOCN concentration provided the maximum charge transfer resistance after 15 days of immersion (13.7 cf. 0.2 kΩ•cm 2 for HDG steel). Overall, these results highlight the potential of TOCN−CLP biopolymeric composites as a basis for sustainable corrosion protection coatings.

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Cellulose microfibers (CMFs) as a smart carrier for autonomous self-healing in epoxy coatings

Abstract: .The cellulose microfibers (CMFs) were synthesized to assist the self-release of loaded product, that provides better corrosion inhibition and self-healing of epoxy coatings.

Cited by 34 publications

References 36 publications

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Experimental and In-Silico Computational Modeling of Cerium Oxide Nanoparticles Functionalized by Gelatin as an Eco-Friendly Anti-Corrosion Barrier on X60 Steel Alloys in Acidic Environments

Biopolymeric Anticorrosion Coatings from Cellulose Nanofibrils and Colloidal Lignin Particles

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