Effects of TiO2 Nanofluid on the Surface State of Brass

2018 ◽  
Vol 18 (12) ◽  
pp. 8321-8326
Author(s):  
Kai Wu ◽  
Hong-Hua Ge ◽  
Feng Wang ◽  
Jun-Yi Sha ◽  
Le-Tian Wang ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Sodium Dodecyl ◽  
Cooling Water ◽  
Surface States ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
X Ray Diffraction ◽  
Brass Surface ◽  
Zinc Compound ◽  
Zn Ions ◽  
Cu And Zn

The surface states of brass in simulated cooling water (SCW) containing or free of sodium dodecyl benzene sulfonate (SDBS) and TiO2 nanofluid were analyzed by means of scanning electron microscope (SEM), energy spectrum analysis (EDS) and X-ray diffraction (XRD). The concentrations of Cu and Zn ions in the solution after brass immersion were analyzed using a plasma emission spectrometer. The relationship between the surface states and corrosion resistance of brass was investigated by electrochemical impedance spectroscopy (EIS). The results showed that the brass surface was mainly covered with zinc compound Zn5(OH)6(CO3)2 as corrosion product in SCW. In SCW containing SDBS, a large amount of SDBS was adsorbed on the brass surface. In TiO2 nanofluid, the brass surface was relatively bare and mainly contained cuprous oxide. There was no obvious adhesion of SDBS aggregates and no accumulation of zinc compound on brass surface in TiO2 nanofluid. TiO2 nanoparticles inhibit the adsorption of SDBS on brass surface. Solution analysis results showed that the concentrations of Cu and Zn ions in TiO2 nanofluid was obviously higher than that in SCW and SCW containing SDBS, indicating that most of corrosion products of brass dissolved into the nanofluid. The EIS results illustrated the brass electrode had a larger reaction resistance in SCW containing SDBS, indicating the good protective performance of the adsorbed SDBS film on brass surface. The reaction resistance of the brass electrode was the smallest in TiO2 nanofluid, which illustrated that TiO2 nanoparticles in solution promoted the corrosion of brass.

scholarly journals Comparison of the Corrosion Behavior of Brass in TiO2 and Al2O3 Nanofluids

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1046
Author(s):  
Siyu Xie ◽  
Yi Zhang ◽  
Yanfang Song ◽  
Fang Ge ◽  
Xin Huang ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Corrosion Behavior ◽  
Sodium Dodecyl ◽  
Cooling Water ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Al2o3 Nanoparticles ◽  
Protective Film ◽  
Base Solution ◽  
Brass Surface ◽  
Dodecyl Benzene Sulfonate

The corrosion behavior of brass in TiO2 and Al2O3 nanofluids using a simulated cooling water (SCW) as the base solution and sodium dodecyl benzene sulfonate (SDBS) as the dispersant was studied by electrochemical measurements and surface analysis in this paper. It was found that SDBS could be adsorbed on the brass surface to form a protective film and have a corrosion inhibition effect on brass in SCW. In the SCW-SDBS-TiO2 nanofluid, some negatively charged TiO2 nanoparticles were attached to the brass surface and no obvious SDBS adsorption film was found, and the SDBS in this nanofluid had almost no corrosion inhibition on brass. In the SCW-SDBS-Al2O3 nanofluid, the brass surface was covered by a uniformly distributed SDBS film containing some Al2O3 nanoparticles which were positively charged, and the corrosion inhibition of brass was significantly improved in this nanofluid. It is concluded that the adsorption of SDBS on the brass surface in nanofluids is related to the charge status of the nanoparticles, which makes brass have different corrosion resistance in various nanofluids.

scholarly journals Study on Crack Initiation and Propagation of New Corrosion Inhibitor during Stress Corrosion of Aluminum Alloy

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Juan Du ◽  
Zi-ming Wei ◽  
Xu-dong Yang ◽  
Qing-mao Liu ◽  
Hai-peng Song ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Crack Initiation ◽  
Corrosion Inhibitor ◽  
Electrochemical Impedance ◽  
Sodium Succinate ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Inhibition Mechanism ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation

In this paper, a novel method combining electrochemical impedance spectroscopy (EIS) and phase shift was used to systematically study the effect of corrosion inhibitor (sodium succinate, sodium dodecyl benzene sulfonate, and new corrosion inhibitor, namely, bis [2-amino-3-(dodecyl dimethyl quaternary ammonium) propyl]-propylamine dichloro) on crack initiation and propagation of aluminum alloy during the slow strain rate tensile process. Using a variety of characterization methods to verify the feasibility of using the new method for in-situ prediction, Kramers–Kronig transformations have been used to validate the experimental data obtained with the EIS measurements. The corrosion inhibition mechanism of these three kinds of inhibitors in the SSRT process was analyzed.

scholarly journals Synthesis of aluminum hydroxide nanoparticles in spontaneously generated vesicles

1993 ◽  
Vol 8 (3) ◽  
pp. 573-577 ◽  
Author(s):  
Iskandar I. Yaacob ◽  
Suhas Bhandarkar ◽  
Arijit Bose
Keyword(s):  
Electron Diffraction ◽  
High Vacuum ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Good Control ◽  
High Energy ◽  
Symmetric Pair ◽  
X Ray Diffraction ◽  
X Ray ◽  
Aluminum Ions

Unilamellar vesicles, formed spontaneously by mixing single-tailed cationic (cetyl trimethyl ammonium tosylate, CTAT) and anionic aqueous solutions of (sodium dodecyl benzene sulfonate, SDBS) surfactants have been used as reactors for the aqueous phase precipitation of nanometer sized particles within their inner cores. AlCl3 solution was encapsulated within these vesicles, aluminum ions were replaced with sodium ions in the extravesicular phase, and sodium hydroxide was then added to the extravesicular region. Hydroxyl ions penetrate through the vesicle walls and react with the available aluminum in the intravesicular region to form the product. The morphology and sizes of these particles were examined by transmission electron microscopy, while their phase and crystalline nature were probed by electron and x-ray diffraction. The product particles were nanometer-sized with near spherical morphology. Good control of particle size was achieved by varying the initial concentration of electrolyte. Single particle electron diffraction revealed a symmetric pair of spots, indicating that the particles were either single crystals or polycrystalline with á low number of grain boundaries or defects. Although wide area electron diffraction showed that the product was δ–Al2O3, powder x-ray diffraction revealed that these particles were, in fact, Al(OH)3. It is likely that heating of these nanoparticles by the high energy electron beam in a high vacuum environment causes a phase transformation, resulting in the difference between the electron and x-ray diffraction results. These results represent the first demonstration of precipitation within vesicles produced spontaneously by mixing appropriate ratios of inexpensive single-tailed surfactants, and may potentially make intravesicular precipitation a commercially viable route for making nanometer-sized particles.

scholarly journals Synthesis of functional magnetic porous SrFe12O19/P(St-DVB-MAA) microspheres by a novel suspension polymerization

2008 ◽  
Vol 6 (4) ◽  
pp. 627-633 ◽  
Author(s):  
Sifang Kong ◽  
Jiang Cheng ◽  
Yangsheng Liu ◽  
Xiufang Wen ◽  
Pihui Pi ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Suspension Polymerization ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Conductometric Titration ◽  
Average Diameter ◽  
X Ray Diffraction ◽  
Uniform Size ◽  
Porous Microspheres ◽  
Magnetic Porous Microspheres

AbstractIn this study, a novel and effective suspension polymerization has been employed to prepare functional magnetic porous SrFe12O19/P(St-DVB-MAA) microspheres in the presence of bilayer surfactants (sodium dodecyl benzene sulfonate (SDBS) and oleic acid (OA)) coated on micro-size magnetic SrFe12O19. This was achieved by pre-polymerizing the organic phase, which contained co-monomers, porogens and treated magnetic particles, at 65°C for 0.5 h under ultrasound conditions. Aqueous solutions containing a dispersion agent were then added to effect suspension polymerization. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and magnetic property measurement system (MPMS) were used to characterize the functional magnetic porous microspheres. The results show that the microparticles are well shaped with a uniform size distribution of about 0.5 ∼ 0.7 mm and the surfaces of the microspheres have many micro-pores with an average diameter of 0.533 µm. There are carboxyl groups (−COOH) on the surface of the microspheres to the extent of 0.65 mmol g−1, as determined by conductometric titration. According to the XRD spectra, iron oxide consists mainly of SrFe12O19 which reveals hexahedral structure. The content of magnetic SrFe12O19 reaches 17.81% (by mass), and the microspheres have good heat resistance. The magnetic porous microspheres are ferromagnetic with high residual magnetization and coercivity, 21.59 emu g−1 and 4.13 kOe, respectively. The saturation magnetisation is around 42.85 emu g−1.

Influence of Al2O3 Nanoparticles on Corrosion Inhibition Performance of Benzotriazole to Brass

2018 ◽  
Vol 18 (12) ◽  
pp. 8327-8332
Author(s):  
Feng Wang ◽  
Hong-Hua Ge ◽  
Kai Wu ◽  
Jun-Yi Sha ◽  
Le-Tian Wang ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Electrochemical Impedance ◽  
Water System ◽  
Optical Microscope ◽  
Al2o3 Nanoparticles ◽  
X Ray Diffraction ◽  
Isothermal Adsorption ◽  
X Ray ◽  
Brass Surface ◽  
Inhibition Performance

The influence of Al2O3 nanoparticles on corrosion inhibition of benzotriazole (BTA) in brass/ simulated water system was studied by potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS). The results show that BTA has good corrosion inhibition effect on brass. Al2O3 nanoparticles could reduce the corrosion inhibition performance of BTA. The higher the concentration of Al2O3 nanoparticles in simulated water, the lower corrosion inhibition performance of BTA. The isothermal adsorption of BTA on brass surface in simulated water and Al2O3 nanofluids was analyzed. The results indicated that the adsorption of BTA on brass surface followed the Langmuirs’ adsorption isotherm, the adsorption Gibbs free energy ΔG was less than −40 kJ/mol, corresponding to chemical adsorption, in both simulated water and Al2O3 nanofluids. The −ΔG value of BTA on brass surface decreased in Al2O3 nanofluids, indicating the weakening of the BTA adsorption on the brass surface. Surface analysis of brass samples by optical microscope and X-ray diffraction confirmed the above results.

Preparation of Silver Nanoplates in SDBS System

2009 ◽  
Vol 620-622 ◽  
pp. 533-536 ◽  
Author(s):  
Yong Hui Song ◽  
Yong Yang ◽  
Wen Wen Gao ◽  
Xin Zhe Lan
Keyword(s):  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Xrd Analysis ◽  
Benzene Sulfonate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silver Nanoplates ◽  
Dodecyl Benzene Sulfonate ◽  
Tension Analysis ◽  
Scanning Electron

Silver nanoplates were prepared in the solution of sodium dodecyl benzene sulfonate (SDBS) and polyvinyl pyrrolidone (PVP) via reducing silver nitrate with hydrazine hydrate. X-ray diffraction (XRD) and Scanning electron microscope (SEM) were applied to identify phase and observe microstructure. The surface tension analysis showed that in SDBS + PVP system, the γ-C curve acted as dual-platform and the corresponding concentration turning points were C1 (0.8g/L) and C2 (6.0g/L) respectively. XRD analysis confirmed that the reduction product was element silver. SEM observation revealed that nano-plates silver were obtained when the SDBS concentration was between C1 and C2, otherwise spherical-shaped nanoparticles were synthesized.

The Influence Research of Cu2+ on CuXFe1-XO•Fe2O3 Magnetic Fluids

2011 ◽  
Vol 236-238 ◽  
pp. 2004-2007
Author(s):  
Ye Ji ◽  
Hui Ping Shao ◽  
Zhi Meng Guo ◽  
Dong Hua Yang
Keyword(s):  
Saturation Magnetization ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Magnetic Fluids ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Dodecyl Benzene Sulfonate ◽  
20 Nm

In order to increase the magnetic fluids in target-based cancer treatment, the Cu2+has been studied in this study. The Fe3O4and Cu0.1Fe0.9O•Fe2O3magnetic nanoparticles were prepared by ultrasonic emulsion method, and then disperse them into water with sodium dodecyl benzene sulfonate (SDBS) as surfactants to make magnetic fluids. The cubic inverse spinel structure of Fe3O4and Cu0.1Fe0.9O•Fe2O3nanoparticles were analyzed by X-ray diffraction technique (XRD).The saturation magnetization of Fe3O4and Cu0.1Fe0.9O•Fe2O3were 79.55 emu•g-1and 75.90 emu•g-1by vibrating sample magnetometer (VSM). The morphologies of nanoparticles were observed by transmission electron microscope (TEM). The particle size was uniform 10-20 nm, and their shape was approximately spherical. The Cu0.1Fe0.9O•Fe2O3magnetic particle functional group and the surface of particle coated with SDBS have been detected by Fourier Transform Infrared Spectroscopy (FT-IR). The magnetic fluids with a high saturation magnetization and stability have been prepared successfully in this study.

Morphology Controllable Synthesis of ScF3:Er3+, Yb3+ Nano/Sub-Microncrystals by Hydrothermal/Solvothermal Process

2016 ◽  
Vol 16 (4) ◽  
pp. 3710-3714
Author(s):  
Lili Han ◽  
Hua Li ◽  
Zhipeng Ci ◽  
Yuhua Wang
Keyword(s):  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Excitation Power ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Red Phosphors ◽  
Two Photon ◽  
Photon Process ◽  
Dodecyl Benzene Sulfonate ◽  
Co Doped

In this paper, red phosphors Yb3+–Er3+ co-doped ScF3 nano/microcrystals were successfully prepared by a facile hydrothermal/solvothermal route using the sodium dodecyl benzene sulfonate (SDBS) as the surfactant. The structure, morphologies and up-conversion (UC) photoluminescence properties of the as-prepared products were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectra, respectively. The SEM images show that the obtained samples are the uniform cubic and cuboid crystals. With the increase of the surfactant SDBS or the change in the solvent types, the sample change their size from nanometer to submicron. Upon the 980 nm laser diode excitation, the ScF3:Er3+, Yb3+ nanocrystals exhibit red emission which can be assigned to the characteristic 4F9/2/4I15/2 transition of Er3+. In order to understand the emission mechanisms of ScF3:Er3+, Yb3+ nanocrystals, the dependence of UC luminescence intensity on the 980 nm excitation power was measured, suggesting that the UC phenomenon results from a two-photon process. Meanwhile, the emission intensities of the Yb3+–Er3+ codoped ScF3 nano/sub-micro crystals with different solution composition show an obvious change under the 980 nm laser excitation. Therefore, the phosphors Yb3+–Er3+ co-doped ScF3 possibly have a potential application in the biological applications.

Coordination Assemblies of CoII, NiII, ZnII, and CuII with 3,3′,4,4′-Biphenyltetracarboxylic Acid and Three Positional Isomeric Ligands

2013 ◽  
Vol 66 (11) ◽  
pp. 1378 ◽  
Author(s):  
Wei Luo ◽  
Di Yao ◽  
Haiye Li ◽  
Fuping Huang ◽  
Qing Yu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Coordination Polymers ◽  
Crystallographic Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Stability Of Complexes ◽  
Stability Of Complexes ◽  
Zn Ions ◽  
Thermal Stability Of ◽  
Cu And Zn

Eight different complexes with three positional isomeric dipyridyl ligands (3,3′-Hbpt, 3,4′-Hbpt, and 4,4′-Hbpt) (here, 3,3′-Hbpt = 1H-3,5-bis(3-pyridyl)-1,2,4-triazole, 3,4′-Hbpt = 1H-3-(3-pyridyl)-5-(4-pyridyl)-1,2,4-triazole, and 4,4′-Hbpt = 1H-3,5-bis(4-pyridyl)-1,2,4-triazole), as well as 3,3′,4,4′-biphenyltetracarboxylic acid (H4bptc), namely, {[M(bptc)0.5(3,3′-Hbpt)(H2O)2]·H2O}n (M = Co (1), M = Ni (2)), {[Zn2(bptc)(3,3′-Hbpt)2]·3H2O}n (3), [Co(bptc)0.5(3,4′-Hbpt)(H2O)]n (4), [Ni(bptc)0.5(3,4′-Hbpt)2(H2O)2]n (5), {[Cu(bptc)0.5(3,4′-Hbpt)(H2O)]·H2O}n (6), and {[M(bptc)0.5(4,4′-Hbpt)2(H2O)]·4H2O}n (M = Co (7), and Ni (8)) were synthesised and characterised by single-crystal X-ray diffraction. The crystallographic analysis demonstrates that bptc influences the MII (M = Co, Ni, Cu, and Zn) ions to form 2D layers, which are further connected via the isomeric bpt connectors, leading to many types of coordination polymers, such as 2D layers(for 1–3, 5), 3D four-connected nets with a short Schläfli symbol of (64.82) (for 4, 6), and 3D four-connected nets with a short Schläfli symbol of (64.82)(5.63.72)0.5 (for 7–8). This work demonstrates that the isomeric effects of the bpt ligands influence the construction of these frameworks. The thermal stability of complexes 1–6 was investigated.

On the Properties of an Ion Conductive System Incorporated in Hybrid Films

2000 ◽  
Vol 628 ◽  
Author(s):  
G. González ◽  
P. J. Retuert ◽  
S. Fuentes
Keyword(s):  
Electrochemical Impedance ◽  
Ternary Phase Diagram ◽  
Lithium Perchlorate ◽  
Molar Ratio ◽  
Ionic Conductors ◽  
X Ray Diffraction ◽  
Poly Ethylene Oxide ◽  
Ion Conducting ◽  
Poly Ethylene ◽  
High Degree

ABSTRACTBlending the biopolymer chitosan (CHI) with poly (aminopropilsiloxane) oligomers (pAPS), and poly (ethylene oxide) (PEO) in the presence of lithium perchlorate lead to ion conducting products whose conductivity depends on the composition of the mixture. A ternary phase diagram for mixtures containing 0.2 M LiClO4 shows a zone in which the physical properties of the products - transparent, flexible, mechanically robust films - indicate a high degree of molecular compatibilization of the components. Comparison of these films with binary CHI-pAPS nanocomposites as well as the microscopic aspect, thermal behavior, and X-ray diffraction pattern of the product with the composition PEO/CHI/pAPS/LiClO4 1:0.5:0.6:0.2 molar ratio indicates that these films may be described as a layered nanocomposite. In this composite, lithium species coordinated by PEO and pAPS should be inserted into chitosan layers. Electrochemical impedance spectroscopy measurements indicate the films are pure ionic conductors with a maximal bulk conductivity of 1.7*10-5 Scm-1 at 40 °C and a sample-electrode interface capacitance of about 1.2*10-9 F.

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