Effect of synthesized NiFe 2 O 4 -silica nanocomposite on the performance of an ecofriendly silane sol–gel coating

Gharagozlou, Mehrnaz; Naderi, Reza; Baradaran, Zahra

doi:10.1016/j.porgcoat.2015.08.009

Cited by 27 publications

(8 citation statements)

References 44 publications

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“…The broad peak at around 23 for SC powder can be attributed to the characteristic diffraction peak of amorphous siloxane matrix. 46 Adding fGO nanosheets to SC resulted in the appearance of a second peak attributed to the fGO at 7.62 with an interlayer spacing of 12.45 A, which displays a relative decline in 2 theta angle and an increase in d-spacing compared with that of the original graphene oxide (8.64 and 10.22 A, respectively). These observations declare that fGO nanosheets were successfully intercalated in the silane lm.…”

Section: Characterization Of Silane Coating Lmsmentioning

confidence: 99%

Hybrid silane coating reinforced with silanized graphene oxide nanosheets with improved corrosion protective performance

2016

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Section: Characterization Of Silane Coating Lmsmentioning

confidence: 99%

Hybrid silane coating reinforced with silanized graphene oxide nanosheets with improved corrosion protective performance

2016

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“…Furthermore, silica is commonly used to protect or give special features to surfaces. In terms of protection, organosilanes are well known as corrosion protectors for metallic surfaces such as steel and aluminum alloys [18], where other metal such as cerium [19], metallic nanoparticles such as NiFe 2 O 4 [20] and other compounds such as phosphonic acid [21] can also be added to the coating to enhance the protection. The surface characteristics are another feature that are able to be tuned by the silica coatings.…”

Section: Introduction On Silica-based Materialsmentioning

confidence: 99%

Fourier Transform Infrared and Raman Characterization of Silica-Based Materials

Capeletti¹,

Zimnoch²

2016

Applications of Molecular Spectroscopy to Current Research in the Chemical and Biological Sciences

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Fourier Transform Infrared and Raman are powerful techniques to evaluate silica and hybrid silica structure. It is possible to evaluate the silica network formation along the hydrolysis and condensation reactions in terms of siloxane rings formation and Si-O(-Si) angle deformation due to the introduction of organic groups, the employed synthetic route or encapsulated species interaction. The siloxane four-or six-membered rings imply in a more rigid or flexible network, respectively, in order to accommodate the organic groups. A structural analysis of the materials is of high importance, since interactions between the encapsulated molecules and the matrix are critical for the device performance, such as sensors. This type of device needs the permeation of an analyte to activate the encapsulated receptor molecules inside the silica structure. Fourier transform infrared spectrometry can be also used to determine parameters of the silica network as a function of the hydrophilicity/hydrophobicity degree and the siloxane ring structure with respect to thin film porosity. This silica structural analysis is reviewed along the text in a tentative of better exploring the data resulting from these powerful techniques. In addition, the functionalization of silica structures by the use of organoalkoxysilanes, which is important to the creation of high-specific materials, can be well described by these two complementary techniques. The Si-C bonds and the maintenance of the organic substituents such as methyl, octyl, octadecyl, vinyl, phenyl, aminopropyl, mercaptopropyl, isocyanatopropyl, iodopropyl, chloropropyl and glicydoxypropyl could be evaluated after the sol-gel synthesis process. The literature regarding silica vibrational spectroscopy is also explored creating a data bank of wave numbers for the most important bonds for different types of silica and hybrid silica materials obtained by different synthetic routes.

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“…Figure 10 depicts the Bode (Figure 10a) and Nyquist (Figure 10b) plots of bare and coated AA 2024-T3 obtained after immersion into 50 mM NaCl solution for 24 h. The Bode diagram for the bare AA 2024-T3 demonstrates one time constant in the middlelow frequency range due to charge transfer processes based on corrosion activity s and a second time constant in the low frequency range that is ascribed to a diffusion limitation of the corrosion process [26]. The Bode plots for both the coatings AA-coat-CeMo and AA-coat-MBT present a relaxation time in the high frequency range that is assigned to the coating properties, a second time constant in the middle frequency domain that is related to the response of both the intermediate oxide layer as well as the Al-O-Si covalent bonds formed due to interaction between interfacial Al-OH and Si-OH groups, and a third time constant in the low frequencies that is attributed to the corrosion onset due to the pits that have been formed into the intermediate oxide layer [8]. The Bode plots for the coatings AA-coat-CeMo-MBT and AA-coat reveal two time constants, one in the high frequency domain due to the coating properties, and a second time constant in the middle frequencies due to the intermediate oxide layer and the Al-O-Si covalent bonds formed via interaction between interfacial Al-OH and SiOH groups.…”

Section: Corrosion Studymentioning

confidence: 99%

“…Nevertheless, this disadvantage can be overcome by the addition of inorganic or organic corrosion inhibitors into the coatings that can provide self-healing properties to sol-gel coatings [6][7][8]. Furthermore, the corrosion inhibitors can be encapsulated into containers before their incorporation into the coatings in order to control the release of inhibitor without loss of the coatings coherence [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Advancement in corrosion resistance of AA 2024-T3 through sol-gel coatings including nanocontainers

2017

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-The current study investigates the effect of nanocontainers incorporation into sol-gel coatings for the protection improvement of aluminium alloys 2024-T3 against corrosion. The nanocontainers were synthesized via a combination of radical polymerization process and sol-gel technique. They consist of cerium and molybdenum oxides and loaded with the anodic corrosion inhibitor 2-mercaptobenzothiazole (MBT). The preparation of the coating matrix was accomplished using (3-glycidoxypropyl)trimethoxysilane as precursor. These organic modified silicate based sol-gel films were evaluated for their corrosion behaviour as well as nanomechanical properties using electrochemical and nanoindentation techniques, respectively. The results reveal that the presence of loaded nanocontainers improved the corrosion protection of the coatings; outcome that can be attributed to either the increase coherence of the coating or the simultaneously inhibition action of cerium and molybdate ions together with the corrosion inhibitor MBT. Moreover, the addition of nanocontainers empty or loaded with inhibitor amount strengthens (increase of wear resistance) the coating and decreases the coefficient of friction.

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Effect of synthesized NiFe 2 O 4 -silica nanocomposite on the performance of an ecofriendly silane sol–gel coating

Cited by 27 publications

References 44 publications

Hybrid silane coating reinforced with silanized graphene oxide nanosheets with improved corrosion protective performance

Hybrid silane coating reinforced with silanized graphene oxide nanosheets with improved corrosion protective performance

Fourier Transform Infrared and Raman Characterization of Silica-Based Materials

Advancement in corrosion resistance of AA 2024-T3 through sol-gel coatings including nanocontainers

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