Investigation of loaded halloysite nanotubes with novel inhibitor as a smart anticorrosion epoxy coating

Hoseinzadeh, Alireza; Javadpour, Sirus

doi:10.1088/2053-1591/ab3f12

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…The adsorption data indicated the SSA in the low-pressure range, and the total pore volume was attained from desorption isotherms of N 2 at 120 °C with the Barret− Joyner−Halenda approach. 60,61 The adsorption−desorption isotherms of HNTs and BTA-loaded HNTs follow type 3 (H3) of hysteresis loops classified by IUPAC, and such loops expand over all the relative pressure (P/P 0 ) values due to the polar molecules' irreversible interlayer intercalation and clay particles' expansion and contraction. 62 Moreover, Figure S5 depicts the decrease in the adsorbed-desorbed volume due to the reduction in the total pore volume and BET SSA, as displayed in Table 1.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Unlike other tubular carriers, HNTs are natural, nontoxic, and environmentally friendly with great potential to store the active species for corrosion protection. 20,28,29 However, because of the firm van der Waals attractive forces in HNTs itself, it is difficult to ensure the uniform dispersion of these nanosize carriers in organic solvents. 26,30 Furthermore, the direct modification of the surface of HNTs is quite tricky because the majority of the hydroxyl groups reside on the inner surfaces of the tubes, and only a few are present on the outer surface.…”

Section: Introductionmentioning

confidence: 99%

“…Hollow carriers are the most studied particles as these have the capability to store the active agents in the lumen of the carrier efficiently. , HNTs have hollow inner lumens in nanosize covered by the multiwalled aluminum silicate (Al 2 Si 2 O 5 (OH) 4 ·2H 2 O). Unlike other tubular carriers, HNTs are natural, nontoxic, and environmentally friendly with great potential to store the active species for corrosion protection. ,, However, because of the firm van der Waals attractive forces in HNTs itself, it is difficult to ensure the uniform dispersion of these nanosize carriers in organic solvents. , Furthermore, the direct modification of the surface of HNTs is quite tricky because the majority of the hydroxyl groups reside on the inner surfaces of the tubes, and only a few are present on the outer surface. , One other major limitation is that these carriers hold individual active species, while the coating matrix requires simultaneously multiple active species to self-heal the damaged matrix . Hence, it is preferable for the carriers to host multiples of the active agents in order to minimize the use of the carriers. , …”

Section: Introductionmentioning

confidence: 99%

Hybrid Halloysite Nanotubes as Smart Carriers for Corrosion Protection

Khan

Hassanein

Habib

et al. 2020

ACS Appl. Mater. Interfaces

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Novel hybrid halloysite nanotubes (HHNTs) were developed and used as smart carriers for corrosion protection of steel. For this purpose, as-received halloysite nanotubes (HNTs) were loaded with a corrosion inhibitor, imidazole (IM), by vacuum encapsulation. In the next step, a layer by layer technique was employed to intercalate another inhibitor, dodecylamine (DDA), in the polyelectrolyte multilayers of polyethylenimine and sulfonated polyether ether ketone, leading to the formation of HHNTs. During this process, IM (5 wt %) was successfully encapsulated into the lumen of HNTs, while DDA (0.4 wt %) was effectively intercalated into the polyelectrolyte layers. Later, the HHNTs (3 wt %) were thoroughly dispersed into the epoxy matrix to develop smart hybrid self-healing polymeric coatings designated as hybrid coatings. For a precise evaluation, epoxy coatings containing as-received HNTs (3 wt %) without any loading denoted to as reference coatings and modified coatings containing HNTs loaded with IM-loaded HNTs (3 wt %) were also developed. A comparative analysis elucidates that the hybrid coatings demonstrate decent thermal stability, improved mechanical properties, and promising anticorrosion properties compared to the reference and modified coatings. The calculated corrosion inhibition efficiencies of the modified and hybrid coatings are 92 and 99.8%, respectively, when compared to the reference coatings. Noticeably, the superior anticorrosion properties of hybrid coatings can be attributed to the synergetic effect of both the inhibitors loaded into HHNTs and their efficient release in response to the localized pH change of the corrosive medium. Moreover, IM shows an active release in both acidic and basic media, which makes it suitable for the protection of steel at the early stages of damage, while DDA being efficiently released in the acidic medium may contribute to impeding the corrosion activity at the later stages of deterioration. The tempting properties of hybrid coatings demonstrate the beneficial role of the development of novel HHNTs and their use as smart carriers in the polymeric matrix for corrosion protection of steel.

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