Anodic Electrophoretic Deposition of TiO2 Nanoparticles Synthesized Using Sol Gel Method

2013 ◽  
Vol 832 ◽  
pp. 633-638
Author(s):  
Khatijah Aisha Yaacob ◽  
David Jason Riley
Keyword(s):  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Anatase Phase ◽  
Sol Gel ◽  
Particle Diameter ◽  
Deposition Process ◽  
Titanium Isopropoxide ◽  
Solid Loading ◽  
Charged Nanoparticles ◽  
Positively Charged

Many researches on electrophoretic deposition of TiO2 nanoparticles (NPs) use commercial TiO2 nanoparticles from Degussa. TiO2 from Degussa is not use in this research because in order to make the TiO2 nanoparticle electronically charged and move under an applied constant voltage, a small amount of iodine and acetylacetone needs to be added to the suspension. It is suggested that the H+ ions generated by the reaction is absorbed on the suspended particles making them positively charged. For anodic EPD, negatively charged nanoparticles are required. In this research TiO2 nanoparticles were prepared by adding 1 ml of titanium isopropoxide dilute with 1 ml ethanol to 10 ml DI water and stirrer under 0°C for 4 hr. As prepared TiO2 nanoparticle were centrifuged at 5500 rpm for 10 min to isolate the particles from the solution. Then the TiO2 nanoparticles were resuspended in ethanol or water. TiO2 nanoparticle with particle diameter of 4.66 nm and anatase phase were produced. Important electrophoretic deposition process parameters, such as apparent pH of the TiO2 NPs, applied voltage, deposition time and solid loading, were studied during electrophoretic deposition of TiO2 nanoparticles.

How Electrophoretic Deposition with Ligand-Free Platinum Nanoparticles Affects Contact Angle

2015 ◽  
Vol 654 ◽  
pp. 218-223 ◽  
Author(s):  
Alexander Heinemann ◽  
Sven Koenen ◽  
Kerstin Schwabe ◽  
Christoph Rehbock ◽  
Stephan Barcikowski
Keyword(s):  
Contact Angle ◽  
Electrophoretic Deposition ◽  
Platinum Nanoparticles ◽  
Deposition Time ◽  
Deposition Process ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Ligand Free ◽  
Vital Parameters ◽  
Scanning Electron

Electrophoretic deposition of ligand-free platinum nanoparticles has been studied to elucidate how wettability, indicated by contact angle measurements, is linked to vital parameters of the electrophoretic deposition process. These parameters, namely the colloid concentration, electric field strength and deposition time, have been systematically varied in order to determine their influence on the contact angle. Additionally, scanning electron microscopy has been used to confirm the homogeneity of the achieved coatings.

Fabrication of Barium Titanate Inverse Opals by Sol-Gel Electrophoretic Deposition Process

2010 ◽  
Vol 434-435 ◽  
pp. 247-252 ◽  
Author(s):  
Bo Li ◽  
Jin Qing Wang ◽  
Rei Fujiwara ◽  
Makoto Kuwabara ◽  
Ming Fu ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Photonic Crystals ◽  
Electrophoretic Deposition ◽  
Sol Gel ◽  
Deposition Process ◽  
Visible Range ◽  
Face Centered Cubic ◽  
Sem Images ◽  
Inverse Opals ◽  
Opal Template

Barium titanate (BTO) inverse opal photonic crystals were fabricated by a process of self-assembly of polystyrene opal template in combination with electrophoretic deposition (EPD) of nanoparticles from BTO suspension. In this process, stable monodispersed suspension of BTO nanoparticles was prepared by dispersing BTO gel into a mixed solvent of 2-methoxyethanol and acethylacetone. Then the BTO nanoparticles were infilled into the interstices of the opal template formed by monodisperse polystyrene microspheres by electrophoretic deposition, and then polystyrene template was removed by calcining the specimen at a final temperature of 500oC. SEM images show that the inverse opals possess face-centered cubic (fcc) structure with center to center distant of the air spheres 310 nm. A photonic bandgap in the visible range is observed from reflection spectra of the sample. Such BTO inverse opals as photonic crystals should be useful in device applications.

scholarly journals Controlled Synthesis and Microstructural Properties of Sol-Gel TiO2 Nanoparticles for Photocatalytic Cement Composites

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 26 ◽  
Author(s):  
Elena Cerro-Prada ◽  
Sara García-Salgado ◽  
M.Angeles Quijano ◽  
Fernando Varela
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Tio2 Nanoparticles ◽  
Anatase Phase ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Titania Nanoparticles ◽  
Structural Defects ◽  
Microstructural Properties ◽  
Anatase Nanoparticles

Titania nanoparticles are intensely studied for photodegradation applications. Control of nanoscale morphology and microstructural properties of these materials is critical for photocatalytic performance. Uniform anatase-type TiO2 nanoparticles were prepared by the sol-gel process using titanium isopropoxide as precursor. Controlled annealing up to 400 ℃ established crystallization and particle size ranging between 20 and 30 nm. Detailed thermal examination reveals that anatase phase transformation into rutile is affected by the annealing temperature and by the initial particle size. The anatase to rutile phase transformation occurs in the nanoparticles at 550 ℃. The Total Reflection X-ray Fluorescence (TXRF) study of the anatase nanoparticles shows a shift towards higher energy in the Ka Ti line of 10 eV, related to structural defects. These features were discussed in the photocatalytic behavior of several cement-based materials modified with the so-prepared anatase nanoparticles. The photocatalytic activity of the anatase-type TiO2/cement mortar system is evaluated from the degradation of Methylene Blue (MB) under UV irradiation, monitored through the absorbance at 665 nm. The results show that the photocatalytic composites exhibit up to 76.6% degradation efficiency. Mechanical testing of the nano-TiO2 modified cementitious composites evinces a moderate reinforcement of the strength properties at long ages.

scholarly journals Novel and facile synthesis of transparent-monolithic TiO2 gels by sol-gel method based on an esterification reaction

2016 ◽  
Vol 34 (3) ◽  
pp. 633-640 ◽  
Author(s):  
Kais Elghniji ◽  
Zohra Anna-Rabah ◽  
Elimame Elaloui
Keyword(s):  
Acetic Acid ◽  
Anatase Phase ◽  
Sol Gel ◽  
Gelation Time ◽  
Chelating Agent ◽  
Active Role ◽  
Titanium Isopropoxide ◽  
Esterification Reaction ◽  
X Ray Diffraction ◽  
External Water

AbstractTransparent TiO2 monoliths were obtained through a modified sol-gel route from titanium isopropoxide as a precursor. By controlling the hydrolysis of this precursor through the intermediate of esterification reaction between acetic acid and isopropanol at 40 °C, transparent TiO2 xerogel monoliths were obtained. The monoliths prepared by this method were transparent in the wavelengths between 400 nm and 700 nm. Fourier transform infrared (FT-IR) spectroscopy suggested that the acetic acid played also an active role as a chelating agent, forming Ti[(OH)y(OOCCH3)x] less reactive species. Powder X-ray diffraction confirmed the amorphous-to-anatase phase transformation with the formation of unknown Ti-containing complex at 90 °C. Only anatase TiO2 could be observed in the samples calcined at 250 °C and 450 °C. Optical aspects of the gel (transparent-transluscent transformation of monolithic gel) and gelation time were controlled by changing the amount of external water.

A study of the electrophoretic deposition of polycaprolactone-chitosan-bioglass nanocomposite coating on stainless steel (316L) substrates

2021 ◽  
pp. 088391152110635
Author(s):  
Zahra Sadeghinia ◽  
Rahmatollah Emadi ◽  
Fatemeh Shamoradi
Keyword(s):  
Stainless Steel ◽  
Surface Treatment ◽  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Sol Gel ◽  
Nanocomposite Coating ◽  
Deposition Method ◽  
Stainless Steel 316L ◽  
Gel Method

In this research, bioglass nanoparticles were synthesized via sol-gel method and a polycaprolactone-chitosan-bioglass nanocomposite coating was formed on SS316L substrate using electrophoretic deposition method. Then, the effects of voltage and deposition time on morphology, thickness, roughness, and wettability of final coating were investigated. Finally, biocompatibility and toxicity of the coating were evaluated. The results showed that increase of both time and voltage enhanced the thickness, roughness, and wettability of coating. Also, increase of deposition time increased the agglomeration. Therefore, it can be concluded that voltage of 20 V and time of 10 min are suitable for the formation of a uniform agglomerate-free coating. The presence of bioglass nanoparticles also led to the increase of roughness and improvement of polycaprolactone hydrophobicity. The results also showed higher bioactivity in polycaprolactone-chitosan-1% bioglass nanocomposite coating sample. This sample had a roughness ( Ra) of 1.048 ± 0.037 μm and thickness of 2.54 ± 0.14 μm. In summary, the results indicated that coating of polycaprolactone-chitosan-bioglass nanocomposite on SS316L substrate could be a suitable surface treatment to increase its in vivo bioactivity and biocompatibility.

Preparation of TiO2 Nanorod Arrays by Electrophoretic Deposition of Titania Nanoparticles

2007 ◽  
Vol 119 ◽  
pp. 67-70 ◽  
Author(s):  
Zhang Qi ◽  
Yong Joo Kim ◽  
Wan In Lee
Keyword(s):  
Electrophoretic Deposition ◽  
Anatase Phase ◽  
Sol Gel ◽  
Titania Nanoparticles ◽  
Nanorod Arrays ◽  
Anodized Aluminum ◽  
Sem Images ◽  
Tio2 Nanorod ◽  
Tio2 Nanorod Arrays ◽  
Anatase Titania

The TiO2 nanorod arrays were fabricated by the electrophoretic deposition (EPD) of the 4.5 and 7 nm-sized anatase titania nanoparticles using the anodized aluminum oxide (AAO) as the template. Each of the TiO2 nanoparticle was plus-charged by adjusting the pH of the electrolyte. The growth rate of TiO2 nanorod arrays with this new method was dramatically higher than that of the arrays obtained from the conventional EPD method employing sol-gel solutions. In addition, the robust anatase-phase TiO2 nanorod arrays were obtained without post-thermal treatment. The scanning electron microscope (SEM) images showed that the titania nanoparticles were tightly interconnected to form the highly uniform and well-organized TiO2 nanorod arrays. The diameter of the TiO2 nanorod arrays was 55~58 nm with the length of 15 0m, which corresponded to the size of AAO templates.

A Study of Photocatalyst of the TiO2 Thin Film with Acid Dispersed CNT for Dye-Sensitized Solar Cell

2010 ◽  
Vol 297-301 ◽  
pp. 764-770
Author(s):  
Yong Woo Kim ◽  
Eun Nara Cho ◽  
Soo Chang Choi ◽  
Deug Woo Lee
Keyword(s):  
Thin Film ◽  
Solar Cell ◽  
Tio2 Thin Film ◽  
Anatase Phase ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Rutile Phase ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized ◽  
Carbon Nano Tubes

M-CNTs (Multiwall Carbon Nano Tubes) can be used as an electrode, transferring electrons and heat very easily. This property helps transfer electrons created in TiO2 layer of DSSC (Dye-sensitized Solar Cell). CNTs layer with TiO2 utilized for the photocatalyst is expected to contribute to improve the efficiency of the solar cell. The Photocatalyst of TiO2 thin film was manufactured from titanium isopropoxide, ethanol, and HCl by a sol-gel process. To determine the property of TiO2 thin film with CNT, we performed to mix acid dispersed CNT in TiO2 Sol-gel and make coating membranes using sol-gel with different densities of CNT. It was found that the crystal structure changed from the anatase phase to the rutile phase having higher efficiency by XRD measure after treatment of high temperature sintering. To demonstrate the property of each sample, the transmittance of the TiO2 thin film was measured by a spectrometer and dispersion of CNT of the thin film was measured by SEM. In conclusion, the capacitance as the parameter which can affect performance of DSSC was investigated.

Electrophoretic Deposition of Ni Nano-Particles for Self-Repairing of Heat Exchanger Tubes

2007 ◽  
Vol 534-536 ◽  
pp. 1453-1456
Author(s):  
Gyoung Ja Lee ◽  
Su Il Pyun ◽  
Chang Kyu Rhee
Keyword(s):  
Heat Exchanger ◽  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Constant Electric Field ◽  
Deposition Process ◽  
Nano Particles ◽  
Alloy Specimen ◽  
Gas Condensation ◽  
Ni Alloy ◽  
Current Value

The electrophoretic deposition process of Ni nano-particles in organic suspension was employed for self-repairing of heat exchanger tubes. For this purpose, Ni nano-particles prepared by levitation-gas condensation were dispersed into the solution of ethanol with the addition of dispersant. The pitted Ni alloy specimen was prepared by applying a potential of 0.9 V (vs. Ag/AgCl) in aqueous 0.1 M NaCl solution. For electrophoretic deposition of Ni nano-particles on the specimen, a constant electric field of 100 V cm-1 was applied to the specimen for 180 s in Nidispersed solution. It was found that as the electrophoretic deposition time increased, the size of the pit remarkably decreased due to the agglomeration of Ni nano-particles at the pit with a higher current value rather than the outer surfaces of the specimen with a lower current value. Moreover, the current density increased with electrophoretic deposition time and reached a constant value. From the above, it is concluded that as the electrophoretic deposition proceeds, the pit becomes smaller in size, and hence the nano-particles more extensively aggregate at the pit by lyosphere distortion.

Electrophoretic Deposition of Sol-Gel-Derived Ceramic Coatings

1992 ◽  
Vol 271 ◽  
Author(s):  
Yining Zhang ◽  
C. Jeffrey Brinker ◽  
Richard M. Crooks
Keyword(s):  
Electrophoretic Deposition ◽  
Deposition Time ◽  
Sol Gel ◽  
Ceramic Coatings ◽  
Dip Coating ◽  
Refractive Indices ◽  
Chemical Characteristics ◽  
Ceramic Films ◽  
The Individual ◽  
Dip Coated Films

ABSTRACTThe physical, optical, and chemical characteristics of electrophoretically- and dip-coated sol-gel ceramic films are compared. The results indicate that electrophoresis may allow a higher level of control over the chemistry and structure of ceramic coatings than dip-coating techniques. For example, controlled-thickness sol-gel coatings can be prepared by adjusting the deposition time or voltage. Additionally, electrophoretic coatings prepared in a four-component alumino-borosilicate sol display interesting optical characteristics. For example, the ellipsometrically-measured refractive indices of electrophoretic coatings are higher than the refractive indices of dip-coated films cast from identical sols, and they are also higher than any of the individual sol components. This result suggests that there are physical and/or chemical differences between films prepared by dip-coating and electrophoresis.

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