Abstract
The pursuit of low-cost manufacturing of newly effective pigments is a pressing economic need. Thus, in this work, low-cost ZnFe2O4 spinel nanoparticles (ZF-NPs) with an average diameter of 20 nm were successfully synthesized using a simple sol–gel method, which can be extended for large-scale fabrication of a reddish nano pigment. TGA/DTA, XRD, DRS, HRTEM, and SEM/EDX investigations were used to characterize the as-prepared product. The color of synthesized NPs was studied using CIE L*a*b* colorimetric method with color coordinates of L* = 41.7, a* = 72.2, and b* = 48.8. The newly developed pigment was examined to be superior to the traditional pigment (M6001/Fe2O3: L* = 30.4, a* = 42.16, and b* = 45.7). After that, the synthesized nano pigment was integrated into both ink and paint formulations as a multifunctional coating. The inclusion of synthesized nano pigment in metal coating printing ink formulation was done to produce a good alternative and cost-effective substitute for the commercially available pigment used in the inks industry. Also, the effect of the fabricated nanoparticles on corrosion resistance and thermal stability of epoxy-based paint formulations was evaluated using different standard tests. Therefore, the ZnFe2O4 pigment should be applied as a highly efficient inorganic nano pigment.
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Introduction
The coatings industry has recently shown a great deal of interest in the use of nanoparticles because of the ways in which they improve paints and bring about new features.1 Nanoparticle use in coatings has been shown to improve coating performance as well as add new functions to the system, enabling the development of coatings with multiple uses. Resistance to abrasion, erosion, and chemicals, UV light resistance, antifouling qualities, and other advantages of nanomodified paint are just few examples.2
Coatings are indispensable to our daily lives. Coated materials today cover a wide range of products we use in our daily lives, including our homes and other materials for a variety of reasons, including decorative, protective, and utilitarian, but in most cases, a combination of these considerations is used.3 The term “multi-functional coatings” refers to a single-layered coat that can perform multiple functions. These coatings could provide decoration and protection, as well as additional features such as self-cleaning, easy-to-clean, anticorrosion, thermal stability, and antibacterial properties, among others. Preparing multifunctional coatings could also assist to reduce costs, as well as overcome the drawback of a multilayered system, in which the activities are separated. In a multilayered system, coating activities are influenced by each layer in the system, and if one layer is distorted, the entire system is disrupted.4,5
Nowadays, inorganic pigments have been used in many fields in industry such as plastic, polymer, paints, ink, glasses, and ceramics. Most of these pigments are metal-based compounds.6 Pigments with particle size in the nanoscale are more important in the market since they have higher surface area, which translates to a better surface coverage, a higher number of reflectance points and therefore improved color scattering.7,8
For many years, ferrite pigments containing spinel structures have been researched. Typically, they produce high-quality, heat-stable, tan-colored pigments with great thermal stability that are suited for a variety of demanding purposes.9,10,11 The extremely significant class of inorganic pigments known as anticorrosive pigments are characterized by an inhibitory effect when added to paintings.12 Spinel pigments are representative of the large category of potential anticorrosive pigments.13 The spinel structure, denoted by the formula AB2O4, is comprised of a virtually cubic arrangement of oxygen, with the cations occupying tetrahedral and octahedral interstitial sites.14,15 The spinel pigments are extremely durable and maintain their color in a lot of circumstances. The activity of the common ferrite pigments is predicated on their hydrolysis in the coating. In this process, hydroxides are created, which act as a corrosion inhibitor and counteract the creation of soaps of alkaline earth metals in some binders (alkyds, epoxy esters), passivation caused by the presence of OH– ions, and corrosion brought on by the higher pH.10,16
Most nano inorganic pigments, which are blends of metal oxides, are created utilizing a variety of techniques. Quite frequently, the preparation would begin with the mixing of oxides, calcination at high-temperatures, typically higher than 1200 °C, and then crushing to guarantee correct particle size distribution of powders.17 Sol–gel, emulsion precipitation, hydrothermal method, low combustion approach, and others are also employed to create inorganic pigment.18,19,20,21 Simple procedures like sol–gel and solid state chemical reactions produce mixed oxides with large specific surface area and uniform particle sizes.22,23,24 Recently, various mixed metal oxides that are nanosized were created as novel high heat- and/or corrosion-resistant pigments, including Ca2CuO3, Ca3Co2O6, and NiSb2O6.25,26 Color, particle size, and durability in acidic and alkaline conditions are just some of the physicochemical aspects of inorganic pigments that can be significantly impacted by the synthesis process chosen.5,27,28
Lately, non-toxic anticorrosive pigments based on iron oxide and oxides of divalent metals in ferrites of various colors have been created; these ferrite pigments exhibit improved corrosion protection.29,30 They are increasingly frequently employed in coating and plastic compositions that require both low toxicity and great processing stability due to their increasing popularity.31 We discovered by looking through the literature that additional study is still required to develop more efficient nanosized pigments for the coatings industry. Consequently, in the current study, a multifunctional coating based on low-cost zinc ferrite nanoparticles (ZF-NPs) with high chromaticity (a*) was created using the favorable sol–gel process. The solid pigments were identified through TGA/DTA, XRD, HRTEM, SEM/EDX, DRS analyses. The synthesized reddish pigment was also applied in printing inks formulation and as an anticorrosive pigment.
Experimental
Materials
To reduce the economic cost, the chemicals and solvents utilized in this study to produce nanoparticles were obtained commercially and employed without additional purification. Zinc acetate hydrate (Zn(CH3COO)2·2H2O), ferric chloride hydrate (FeCl3·6H2O), cetyl-trimethyl-ammonium-bromide (CTAB), ammonium hydroxide (NH4OH, 28%), and absolute ethanol (C2H5OH) were supplied from Adwic company, Egypt.
Synthesis of ZnFe2O4 NPs
The efficient sol–gel technique was used to fabricate spinel ZnFe2O4 nanoparticles (ZF-NPs) on a massive scale, as documented in the literature.32 In a typical procedure, a solution containing 10.97 g of Zn(Ac)2·2H2O was combined with FeCl3·6H2O solution (27.03 g, 100 mL) in the presence of 2.0% (w/v) CTAB to retain a molar ratio molar ratio of (1 Zn2+:2 Fe3+). The mixture was violently swirled for 1 h at room temperature, then NH4OH (28%) was drop wisely added to the mixture with regular stirring until the desired pH was reached (9–10). The suspension was aged for 24 h after complete precipitation. The resulting reddish-brown residue was refined, rinsed multiple times with deionized water, and dried at 80 °C overnight, yielding spinel dry hydrogel. TGA/DTG thermogram of the spinel dried gel is shown in Fig. 1. Finally, after drying, the sample was ground and calcined in an air muffle at a temperature of 500 °C for 3 h. ZF-NPs were the designation given to the blasted sample for further experimental work.
Instrumentation
Thermal gravimetric analyzer (TGA/DTG, PerkinElmer, USA) and X-ray diffraction (XRD, RigakuD/MAX 2550, k140.15418 nm) were used for phase configuration identification. Scanning electron microscopy (SEM/EDX, JEOLJSM-7500F) was also used to examine the surface morphology of the synthesized specimens. Characterizations were carried out using a JEOLTEM-2100 apparatus for (HRTEM) studies. On a Shimadzu UV-2700 spectrophotometer, UV–visible spectra in the 200–800 nm range were obtained.
Pigment evaluation
Physicochemical measurements
Color test (ASTM D387), melting point test (ASTM D127), oil absorption test (ASTM D281) and specific gravity test (ASTM C329) were carried out at Pachin Company according to standard methods.33,34,35 The “Commission Internationale de l'Eclairage (CIE)” used and recommended the CIE 1976 L*a*b* colorimetric method in the range of 200–800 nm using ten standard observed angles, D65 illumination, and a white standard.36 Three parameters (L*, a*, and b*) are used as color axes in this method. The first two are called a* and b* hue dimensions. The blue color is linked to the negative value of b*. The positive value has to do with yellow color. The green color is linked to the negative value of a*. Red is a positive color and has a positive value. The third is L*, which stands for lightness axis that has a value of 0 for black and a value of 100 for white and CIElab difference ΔE, is calculated by \(\Delta E=\) √[(L*)2 + (a*)2 + (b*)2].
Diffuse reflectance UV–Vis spectroscopy (DRS) analysis
All the synthesized samples’ optical absorbance spectra are measured between the wavelengths of 200 and 800 nm. The samples’ bandgap energies are then inferred from those spectra. The direct bandgap energy (Eg) of as-synthesized samples was determined by fitting the absorption data to the direct transition equation (Tauc’s equation):37
where α is the absorption coefficient, hυ is the photon energy, Eg is the direct bandgap of the material and A is constant.
The bandgap energies of as-prepared samples have been measured by plotting (αhυ)2 as a function of photon energy (hυ) and extrapolating the linear portion of the curve to an absorption equal to zero.21,38
Corrosion tests
Accelerated corrosion laboratory test
A 1 mm X scribe was carved on the dry coated film to expose the underlying steel to the aggressive medium for 28 days. Following the exposure period, the panels were evaluated for the following characteristics: degree of rusting under film (ASTM D 610-00), degree of blistering on coated steel panel according to (ASTM D 714-07), degree of coating adhesion by a cross-cut test (ASTM D 3359-97), and filiform corrosion resistance test was conducted by photographic detection according to (ASTM D 2803-93).
Electrochemical impedance spectroscopy (EIS)
In a three-electrode cell configuration, SCE, platinum spiral and panel covered with coatings were used as reference counter and working electrodes. EIS measurements were done in the frequency range of 10 and 20 mHz and by applying 20 mV sinusoidal perturbation in accordance with the principles of EIS investigation of high resistance coating. The impedance spectra for different Nyquist plots were analyzed by fitting the experimental data to a simple Randles circuit mode [Rs + Cdl/Rct)] as shown in Fig. 2. The equivalent circuit represents the corrosion process on the bare surface, and it consists of the electrolyte resistance (Rs) in series with both double layer capacitance (Cdl) and charge-transfer resistance (Rct) which are in parallel with each other.
Results and discussion
Characterization of the fabricated ZF-NPs
Powder XRD (X-ray diffraction) analysis was done to confirm the crystallinity and phase purity of the newly made nano pigment. The powder XRD patterns of synthesized ZnFe2O4 NPs (Fig. 3) shows diffraction peaks indexed at (111), (220), (311), (222), (400), (331), (422), (511), (440), (531), (620), (533), and (444) planes. Similar XRD pattern for nanosized ZnFe2O4 has also been observed by several reports.39,40 The XRD pattern revealed no extra peaks, confirming the purity of the sample. As a result, the diffraction patterns obtained indicated the creation of pure, crystalline, and single-phase materials with Fd-3m space group cubic spinel zinc ferrite nanostructure (JCPDS 82-1049).41 The mean crystallite size of the manufactured sample is estimated from the full-width-half-maximum (FWHM) of the fundamental diffraction peaks utilizing the Scherrer equation:20
where D is the crystallite size, λ is the wavelength of the incident X-ray radiation, typically 1.54 Å, \(\theta \) is the Bragg angle, \(\beta \) is the FWHM in radians and k is the shape factor equal to 0.89. The average crystallite size of synthesized ZnFe2O4 NPs was found to be 22.5 nm.
Figure 4 shows TEM image of ZF sample generated through dispersion in alcohol. It was discovered that the particles are virtually spherical and within nanoscale size of 20 nm. The results also reveal a narrow particle-size fluctuation throughout the micrograph's field. In addition, the surface morphology of the produced pigment in concern was examined using a scanning electron microscope (SEM) at a tenfold magnification, as shown in Fig. 5a. The crystals ranged in size from nanometer (about 30 nm) to micrometers (approximately 10 μm) and gave homogenous particle size. Energy dispersive X-ray spectroscopy (EDX) was also used to investigate the purity and elemental composition of ZnFe2O4 nanostructure as illustrated in Fig. 5b. It is abundantly evident that the manufactured ZnFe2O4 nanostructure did not include any form of elemental contaminants with purity of 100%. As a result, this approach can be used to make nanoparticulated pigment in industry.
The solid state DRS of the synthesized nano pigment are displayed in Fig. 6. ZF nanostructure shows a sharpening at 350 nm and light absorption tails at about 700 nm, supporting that the as-prepared material has a wide visible light absorption range.42 For materials with narrow bandgaps, the optical absorption coefficient of zinc ferrite is consistent with Tauc's equation.43,44 The bandgap value derived from the absorption spectra of ZF sample was found to be 1.7 eV. It is reported also that the estimated bandgaps of the iron oxide red, M6001/ZF-NPs, and M6001/iron oxide red pigments are 2.2, 1.75, and 2.22 eV, respectively. Accordingly, the red color coordinate a* being 72.22 vs 42.16 of the commercial pigment (M6001/Fe2O3), is significantly higher (Table 1) indicating the higher potential of the synthesized ZF-NPs as basis for new efficient red pigments. The correlation between bandgap energies and the coloristic appearance of materials becomes apparent in this study as reported in recent work.45 Smaller bandgaps allow light with lower energy to excite electrons from the valence into the conduction band, which causes the absorption of the respective wavelength ranges. Therefore, the colors of the materials change because of reflection at various wavelengths. In our situation, the pigments absorb more yellow light (red shift) as a result of the smaller bandgap, giving rise to a more striking reddish appearance.45,46
Applications of the synthesized ZF nano pigment
Printing ink industry
The new nano inorganic pigment ZnFe2O4 NPs was formulated with metal coating ink as epoxy resin binder and butyl glycol as solvent as shown in Table 2. These new printing inks have been applied on metals or tin substrate at room temperature (25 °C). Their efficiency was compared to the commercial printing inks which already exist in Pachin Company (Egypt). Figure 7 shows the color appearance clarity of the new printing inks containing the new nano inorganic pigments ZnFe2O4 NPs compared to M6001. The visual inspection of the printing ink containing new nano inorganic pigments ZnFe2O4 NPs showed that its color was typically similar to the color of the commercial ink (M6001) with lower pigment loading of 40% versus 60%. The prepared inks were stable at the room temperature without any change or decomposition. Furthermore, after 6 months of storage, the produced ink samples showed no change in color or viscosity or when used in printing as mentioned in Fig. 8. These results are very promising and prove that the prepared nano pigment has high efficiency with low economic cost in this application. Therefore, the creation of this new nanosized pigment can be used locally as an alternative to traditional imported pigments.
Anticorrosive paint performance
The new inorganic pigment ZF-NPs was formulated in paints industry as epoxy resin, a binder, and xylene as solvent as shown in Table 3. The corrosion resistance of the produced nano pigment is evaluated here.
Accelerated corrosion laboratory test
Table 4 summarizes the results of a 28-day immersion test in sea water (3.5 percent NaCl) for a paint film incorporated with ZF-NPs. According to the results, the coat incorporating ZF nano pigment has a high level of adhesion, as shown in Fig. 9. The presence of aliphatic hydroxyl and ether groups in the epoxy resin chain and the cured epoxy polymer may contribute to the high polarity of the epoxy resin chain and the cured epoxy polymer.47 The presence of ZF-NPs on the treated steel surface creates a powerful electromagnetic attraction between the two materials. The hydroxyl group concentration of the epoxy compound is directly proportional to the coating adhesion strength to steel. Coating adhesion is increased by the formation of chemical interactions between active hydrogen on the steel surface and epoxide groups in the coating.48 The lack of blisters on the coat was due to the good adhesion. Moreover, the coated film containing nano zinc ferrite pigment has a promising corrosion resistance.
Electrochemical impedance (EIS) results
Table 5 and Fig. 10 provide the impedance data and Nyquist plot of the coated film after 28 days of seawater immersion. The experimental results were compared to the corresponding simple Randles circuit is shown in Fig. 2. The charge-transfer resistance was 11,769 Ohm cm2 on the first day, according to the impedance data in Table 5, and then gradually decreased until 14 days. The charge-transfer resistance increases again between 21 and 28 days due to the creation of a passive layer. The production of porous, soluble hydroxide precipitates over cathodic sites is linked to the anticorrosion action of ferrites in coatings.49,50,51 Cathodic current is reduced by partially blocking the cathodic sites, which also lowers total corrosion. The production of porous, insoluble hydroxide precipitates over cathodic sites is related to ferrites' anticorrosion mechanism in coatings. By partially blocking the cathodic sites, the cathodic current is reduced, and thus total corrosion is reduced.10 This behavior indicates that the semicircles correspond to an adsorption coating on the steel surface containing ZF-NPs. These deposits can result from a number of simple and complicated inorganic processes that produce chemicals that collect on metallic surfaces and are usually beneficial to improve inhibitory behavior.52 Furthermore, the excellent corrosion resistance was attributed to the strong adhesion of paint films to the substrate, which was ascribed to strong homogeneity and high dispersion of nano pigments, which aids in their corrosion resistance. In addition, ferrite pigments can protect steel against corrosion by preventing corrosive elements from penetrating the layer. As a result, they can bind Cl−, O2, and H2O, which are three of the most common causes of excessive corrosion.53 Ferrites passivate steel substrates by creating an oxide layer with a stoichiometry like Fe3O4 on the surface. The hydrolysis of ferrite results in the creation of a passive layer on the steel that controls the medium. The corrosive processes on the cathode accelerate the hydrolysis of this pigment, which buffers the medium. The Fe3+ oxide in the external layer can be hydrated, forming Fe2O3 + H2O or FeOOH, or oxyhydroxide FeOOH.50 In this particular context, we want to make it clear that this behavior is deemed to be unique in comparison with the behavior of zinc ferrite that was manufactured in the bulk condition.54
Conclusions
Reddish inorganic nano pigment “ZnFe2O4 NPs” was successfully synthesized via facile sol–gel method. XRD measurements validated the produced pigment's single-phase spinel structure. The SEM/EDX results revealed that the crystalline particles are homogeneous, nano in size and extremely pure. The produced nanosized pigment has superior physicochemical properties than commercial bulk ones. The bandgap energy of ZF-NPs was measured to be 1.7 eV, and its reddish value (a* = 41.8) was found to be comparable to that of M6001-iron oxide red used in commercial products. The printing ink containing inorganic nano pigments looked like commercial ink (M6001) with less pigmentation weight percent. Moreover, the coated film containing nano pigment has a promising corrosion resistance and high thermal stability. These results were reproducible and could be mass-produced at a reasonable cost on a massive scale. As a result, (ZF-NPs) has the potential to be an economically viable inorganic pigment with multiple applications in printing ink and paints industry.
Data availability
Methods, including statements of data and materials availability and any associated accession codes and references, are available in the online version of this paper.
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Acknowledgments
The authors would like to express the deepest appreciation to Dr. Walaa M. Abd El-Gawad, a researcher in Polymers and Pigments Department, National Research Centre, Cairo, Egypt for her valuable assistance in the implementation and interpretation of corrosion tests of this work.
Funding
Open access funding provided by The Science, Technology & Innovation Funding Authority (STDF) in cooperation with The Egyptian Knowledge Bank (EKB). No funds, grants, or other support was received.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by [MAS] and [WMA]. The first draft of the manuscript was written by [MAS] and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript. Conceptualization, methodology, investigation, resources and writing—review and editing, were contributed by [MAS]. Conceptualization, Methodology, and investigation were contributed by [WMA]. Investigation, supervision were contributed by [SMT]. Investigation, resources were contributed by [AME]. Visualization, supervision were contributed by [MMA].
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Sayed, M.A., Abdelmaksoud, W.M.A., Teleb, S.M. et al. Low-cost fabrication and physicochemical characterization of ZnFe2O4 nanoparticles as an efficient multifunctional inorganic pigment. J Coat Technol Res 20, 1997–2006 (2023). https://doi.org/10.1007/s11998-023-00793-4
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DOI: https://doi.org/10.1007/s11998-023-00793-4