Castor oil-TiO2 hyperbranched poly (ester amide) nanocomposite: a sustainable, green precursor-based anticorrosive nanocomposite coatings

Bhat, Shahidul Islam; Ahmad, Sharif

doi:10.1016/j.porgcoat.2018.06.010

Cited by 41 publications

(12 citation statements)

References 60 publications

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“…The polymer coatings form the protective films on the metal/alloy surfaces. This helps to protect the surfaces of metals/alloys against corrosion in various aggressive environments 3–7 . However, the extensive exposures of the coated metals/alloys to the aggressive environments cause the failures of the materials which are used in all the industrial sectors, especially, pipeline, shipping, boiler, seabridge, and so forth.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Effects of newly synthesized nanocomposites containing multifunctionalized silicon nitride nanoparticles: A study on structural, thermal, electrochemical, mechanical, morphological, water repellent properties for aerospace components

Xavier

2022

J of Applied Polymer Sci

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The silicon nitride (Si 3 N 4 ) nanoparticles modified by 2,5-Bis-(4-aminophenyl)-1,3,4-oxadiazole (BAPOD) investigated by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX), transmission electron microscopy, thermogravimetry (TGA), X-ray diffraction (XRD), and atomic force microscopy (AFM) were reinforced with polyurethane (PU). The newly synthesized formulations such as PU-Si 3 N 4 , PU-BAPOD, and PU-BAPOD/ Si 3 N 4 nanocomposite coated AA7055 aluminum alloy were electrochemically studied by scanning electrochemical microscopy (SECM), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) for their anticorrosion behaviors and compared with pure PU coating. EIS studies revealed excellent protection behavior for the PU-BAPOD/Si 3 N 4 coated AA7055 aluminum alloy in 3.5% NaCl solution. The coating resistance of PU-BAPOD/ Si 3 N 4 nanocomposite was found to be 5995.23 kΩ.cm 2 whereas lower coating resistance was observed for the pure PU coating (141.24 kΩ.cm 2 ). It is found that the coating resistance of PU-BAPOD/Si 3 N 4 nanocomposite is over 42% higher than that of the PU. The measured current for aluminum ions by SECM investigation over the EP-BAPOD/Si 3 N 4 nanocomposite coating was very low (1.6 nA) compared with PU-Si 3 N 4 (7.6 nA) and pure PU coated AA7055 (14.9 nA). The surface morphological studies of the coated AA7055 by SEM/EDX analysis and XRD analysis revealed that the Si 3 N 4 nanoparticles were enriched at the corrosion products which prevented corrosion initiation processes. The enhanced mechanical properties were noticed by mechanical analysis for the PU-BAPOD/Si 3 N 4 nanocomposite coating when the concentration of nanoparticles was 2 wt%. However, there was a decrease in their mechanical properties beyond 2 wt% due to the aggregation of nanoparticles in the PU coated specimen. The results showed that the newly developed PU-BAPOD/Si 3 N 4 nanocomposite coating possessed superior corrosion protection and enhanced hydrophobic behaviors (WCA: 149 ). Therefore, it was concluded that the newly synthesized PU-BAPOD/Si 3 N 4 nanocomposite provided excellent

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Effects of newly synthesized nanocomposites containing multifunctionalized silicon nitride nanoparticles: A study on structural, thermal, electrochemical, mechanical, morphological, water repellent properties for aerospace components

Xavier

2022

J of Applied Polymer Sci

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“…The preparation methods of BA/EGCD and TiO 2 precursor particles are detailed in the SI, Experimental Section. − The nanoparticles can be formed by amidation reaction and hydrogen bond interaction − on the surface of the TiO 2 precursor nanoparticle particles in which oxidized dextran was used as cross-linking agent. Briefly, 0.50 g of TiO 2 precursor particles, 0.25 g of EDC, 0.15 g of NHS, 0.50 g of BA/EGCD, and 1.00 g of gelatin were dispersed in 100 mL of water, and the pH of the mixture was adjusted to 6.0 with 0.01 mol L –1 hydrochloric acid.…”

Section: Experimental Sectionmentioning

confidence: 99%

Synthesis of Gelatin-Based Dual-Targeted Nanoparticles of Betulinic Acid for Antitumor Therapy

Lu¹,

Fan²,

Wang³

et al. 2020

ACS Appl. Bio Mater.

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Betulinic acid (BA) is a natural antitumor agent and has biological activity against multiple human tumor cell lines with low cytotoxicity to normal cells, while the high hydrophobicity and the short half-life of this compound limit its clinical application. Here, gelatin-based dual-targeted nanoparticles of BA are promising to solve this problem. Hydrophobic BA is loaded in cyclodextrin to increase its solubility and prolong the circulation time in vivo. The nanoscale drug delivery systems can further enhance the bioavailability and the antitumor effect of BA and are passively targeted to the tumor tissue sites by enhanced permeability and retention effect. The RGD sequence of gelatin specifically recognizes tumor cells and brings agents into tumor cells. The nanoparticles were characterized by transmission electron microscopy, Fourier transform infrared, nuclear magnetic resonance, etc. In addition, we observed antitumor activity of the nanoparticles using both cell-based assays and mouse xenograft tumors, which proved that betulinic acid/gelatin-γ-cyclodextrin nanoparticles had a better tumor inhibition effect than betulinic acid/γ-cyclodextrin inclusion compound.

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“…The protective films formed by the polymer coatings on the metal/alloy surfaces help to protect the metal/alloy surfaces against corrosion in different aggressive environments. [1][2][3][4][5] However, the failures of the materials are caused by the extensive exposure of the coated metal/ally to the aggressive electrolytes. In order to enhance the protective performance of the polymer coatings, nanoparticles are added to the polymers.…”

Section: Introductionmentioning

confidence: 99%

“…The various applications of polymeric materials in industrial sectors are because of their good electrical, mechanical, thermal and barrier properties. The protective films formed by the polymer coatings on the metal/alloy surfaces help to protect the metal/alloy surfaces against corrosion in different aggressive environments [1–5] . However, the failures of the materials are caused by the extensive exposure of the coated metal/ally to the aggressive electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Effects of Triazole Functionalized SiO₂/TiO₂ Nanoparticles in Polyurethane Coating: A Study on Structural, Thermal, Dynamic Mechanical, Morphological and Electrochemical Properties in Marine Environment

Xavier

2022

ChemistrySelect

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Newly synthesized functional nanoparticles, 3-amino-1, 2, 4triazole-5-thiol (ATAT)/SiO 2 À TiO 2 nanoparticles, investigated by Transmission electron microscopy (TEM), Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/ EDX), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) analysis, were added to the polyurethane (PU) matrix. The produced PU-ATAT/SiO 2 À TiO 2 nanocomposite coated steel specimen was studied by Scanning electrochemical microscopy (SECM), potentiodynamic polarization and Electrochemical impedance spectroscopy (EIS) for their barrier properties against corrosion. The coating resistance (R coat ) of the PU-ATAT/SiO 2 À TiO 2 nanocomposite was found to be 2956.90 kΩ.cm 2 . It was found that the coating resistance of PU-ATAT/SiO 2 À TiO 2 nanocomposite coating was over 50 % higher than that of the PU coating. The current measured along the scratched surface of the PU-ATAT/SiO 2 À TiO 2 nanocomposite coating was found to be very less (1.65 nA). The degradation products analyzed by SEM/EDX and XRD displayed the enriched ATAT/SiO 2 À TiO 2 nanoparticles which hindered the passage of electrolytes into the interface of coating. The hydrophobic nature of the PU-ATAT/SiO 2 À TiO 2 nanocomposite coating (θ = 115.4°) was confirmed by water contact angle measurement. The least oxygen permeability was observed in the PU-ATAT/SiO 2 À TiO 2 . The improved mechanical properties were found by dynamic mechanical analysis (DMA) for the PU-ATAT/SiO 2 À TiO 2 nanocomposite coating. Therefore, the newly synthesized PU-ATAT/SiO 2 À TiO 2 nanocomposite provided an outstanding barrier and mechanical properties due to the addition of ATAT/SiO 2 À TiO 2 nanoparticles to the polyurethane, which obstructed the degradation of materials and assisted in prolonging the life of the coated steel.

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Castor oil-TiO2 hyperbranched poly (ester amide) nanocomposite: a sustainable, green precursor-based anticorrosive nanocomposite coatings

Cited by 41 publications

References 60 publications

RETRACTED: Effects of newly synthesized nanocomposites containing multifunctionalized silicon nitride nanoparticles: A study on structural, thermal, electrochemical, mechanical, morphological, water repellent properties for aerospace components

RETRACTED: Effects of newly synthesized nanocomposites containing multifunctionalized silicon nitride nanoparticles: A study on structural, thermal, electrochemical, mechanical, morphological, water repellent properties for aerospace components

Synthesis of Gelatin-Based Dual-Targeted Nanoparticles of Betulinic Acid for Antitumor Therapy

Effects of Triazole Functionalized SiO₂/TiO₂ Nanoparticles in Polyurethane Coating: A Study on Structural, Thermal, Dynamic Mechanical, Morphological and Electrochemical Properties in Marine Environment

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Castor oil-TiO2 hyperbranched poly (ester amide) nanocomposite: a sustainable, green precursor-based anticorrosive nanocomposite coatings

Cited by 41 publications

References 60 publications

RETRACTED: Effects of newly synthesized nanocomposites containing multifunctionalized silicon nitride nanoparticles: A study on structural, thermal, electrochemical, mechanical, morphological, water repellent properties for aerospace components

RETRACTED: Effects of newly synthesized nanocomposites containing multifunctionalized silicon nitride nanoparticles: A study on structural, thermal, electrochemical, mechanical, morphological, water repellent properties for aerospace components

Synthesis of Gelatin-Based Dual-Targeted Nanoparticles of Betulinic Acid for Antitumor Therapy

Effects of Triazole Functionalized SiO2/TiO2 Nanoparticles in Polyurethane Coating: A Study on Structural, Thermal, Dynamic Mechanical, Morphological and Electrochemical Properties in Marine Environment

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Effects of Triazole Functionalized SiO₂/TiO₂ Nanoparticles in Polyurethane Coating: A Study on Structural, Thermal, Dynamic Mechanical, Morphological and Electrochemical Properties in Marine Environment