scholarly journals Synthesis of Nanostructured Nanoclay-Zirconia Multilayers: a Feasibility Study

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Hao Chen ◽  
Guoping Zhang ◽  
Kathleen Richardson ◽  
Jian Luo
Keyword(s):  
Structural Integrity ◽  
Dip Coating ◽  
Functionally Graded ◽  
Layer By Layer ◽  
Deposition Technique ◽  
X Ray ◽  
Coating Method ◽  
Potential Applications ◽  
Ultrathin Oxide Films ◽  
Dip Coating Method

This paper reports the first effort to synthesize a new class of inorganic nanostructured materials consisting of alternating ultrathin layers of nanoclays and oxide ceramics. A novel solution-based layer-by-layer (LBL) deposition technique was developed to prepare multilayers of hydrated Zr cations and nanoclays. This LBL deposition technique is devised by integrating an electrostatic-mediated dip coating method for making nanoclay-polymer multilayers with a successive ionic layer adsorption and reaction method for making ultrathin oxide films. Nanostructured clay-zirconia multilayer composites formed through subsequent annealing. Characterization by scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction confirmed that these films are uniform and crack-free, consist of no detectable impurities, and possess nanoscale-layered structure. The incorporation of nanoclays facilitates the electrostatic-mediated assembling of multilayers, enhances the structural integrity, and provides a generic framework to construct functionally graded materials. Potential applications are envisaged.

scholarly journals Sol-Gel Synthesis of TiO2/SiO2 and ZnO/SiO2 Composite Films and Evaluation of Their Photocatalytic Activity towards Methyl Green

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
V. L. Chandraboss ◽  
B. Karthikeyan ◽  
J. Kamalakkannan ◽  
S. Prabha ◽  
S. Senthilvelan
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Composite Films ◽  
Dip Coating ◽  
Methyl Green ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Coating Method ◽  
Dip Coating Method

The TiO2/SiO2 and ZnO/SiO2 composite films were prepared by sol-gel dip coating method. The surface morphology and crystal structure of thin films were characterized by means of scanning electron microscopy (SEM) with elementary dispersive X-ray analysis (EDX) and X-ray diffractometer (XRD). Optical properties of films have been investigated using ultraviolet and visible spectroscopy (UV-visible spectroscopy). The photocatalytic activity was established by testing the degradation and decolorization of methyl green (MG) from aqueous solution with artificial UV-light.

scholarly journals Photoetching of Immobilized --PVC Composite for Improved Photocatalytic Activity

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
M. A. Nawi ◽  
Y. S. Ngoh ◽  
S. M. Zain
Keyword(s):  
Oxygen Demand ◽  
Dip Coating ◽  
Bet Surface Area ◽  
Photocatalytic Efficiency ◽  
Solution Ph ◽  
X Ray ◽  
Coating Method ◽  
Compact Fluorescent Lamp ◽  
Dip Coating Method ◽  
Repeated Runs

Commercially acquired TiO2photocatalyst (99% anatase) powder was mixed with epoxidized natural rubber-50 (ENR50)/polyvinyl chloride (PVC) blend by ultrasonication and immobilized onto glass plates as TiO2-ENR50-PVC composite via a dip-coating method. Photoetching of the immobilized TiO2-ENR50-PVC composite was investigated under the irradiation of a 45 W compact fluorescent lamp and characterized by chemical oxygen demand (COD) analysis, scanning electron microscopy-energy dispersive X-ray (SEM-EDX) spectrometry, thermogravimetry analysis (TGA), and fourier transform infrared (FTIR) spectroscopy. The BET surface area of the photoetched TiO2composite was observed to be larger than the original TiO2powder due to the systematic removal of ENR50while PVC was retained within the composite. It also exhibited better photocatalytic efficiency than the TiO2powder in a slurry mode and was highly reproducible and reusable. More than 98% of MB removal was consistently achieved for 10 repeated runs of the photo-etched photocatalyst system. About 93% of the 20 mg L−1MB was mineralized over a period of 480 min. The presence of , , and Cl−anions was detected in the mineralized solution where the solution pH was reduced from 7 to 4.

Fabrication of Uniformly Growing Graphene Films via the Dip-Coating Method

2013 ◽  
Vol 320 ◽  
pp. 185-189
Author(s):  
Juan Yang ◽  
Hong Bo Sun ◽  
Dan Li
Keyword(s):  
Sheet Resistance ◽  
Photoelectron Spectroscopy ◽  
Dip Coating ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Graphene Films ◽  
Coating Method ◽  
Dip Coating Method ◽  
Dip Coating Technique

The graphene (GE) films were fabricated in this paper through the deposition of graphene oxide (GO) sheets onto the quartz slide by means of dip-coating technique, followed by thermal annealing. The growth process and transmittance of the film were monitored by ultraviolet and visible spectrophotometer (UV-Vis), the surface morphology and structure were investigated by Atomic force microscopy (AFM), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Raman. The sheet resistance of the film was also tested and results showed that the sheet resistance is about 60 kΩ-1and the transmittance is as high as 81 % (at 550 nm).

scholarly journals Surface Modification of LiMn2O4for Lithium Batteries by Nanostructured LiFePO4Phosphate

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
B. Sadeghi ◽  
R. Sarraf-Mamoory ◽  
H. R. Shahverdi
Keyword(s):  
Electron Microscopy ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Transmission Electron ◽  
Coating Method ◽  
Dip Coating Method ◽  
Spinel Cathode

LiMn2O4spinel cathode materials have been successfully synthesized by solid-state reaction. Surface of these particles was modified by nanostructured LiFePO4via sol gel dip coating method. Synthesized products were characterized by thermally analyzed thermogravimetric and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). The results of electrochemical tests showed that the charge/discharge capacities improved and charge retention of battery enhanced. This improved electrochemical performance is caused by LiFePO4phosphate layer on surfaces of LiMn2O4cathode particles.

Preparation and Properties of TiO2/SiO2 Thin Films on Enamel Substrates

2016 ◽  
Vol 848 ◽  
pp. 717-721
Author(s):  
Li Yun Chen ◽  
Xiao Ping Liao ◽  
Wei Zhong Jiang ◽  
Jia Yi Ye ◽  
Hui Le Jin ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Ccd Camera ◽  
Dip Coating ◽  
Micro Structure ◽  
X Ray ◽  
Hydrophilic Property ◽  
Coating Method ◽  
Dip Coating Method ◽  
Scanning Electron

nanosize TiO2/SiO2 thin films were deposited by sol-gel dip-coating method on enamel substrates. Crystal structure, micro-structure, hydrophilic property, gloss property was investigated by X-ray diffract meter, scanning electron microscope, CCD camera, enamel gloss meter. The results show that the hydrophilic property of the enamel was greatly increased by heating the enamel with coating TiO2/SiO2 film; the gloss property of the enamel surface greatly increased after the enamel coated with TiO2/SiO2 film. The main crystals in TiO2/SiO2 film on the enamel were anatase when the baking temperature was below the 700°C.

Improved hydrophilicity of zinc oxide-incorporated layer-by-layer polyelectrolyte film fabricated by dip coating method

2012 ◽  
Vol 18 (4) ◽  
pp. 1441-1445 ◽  
Author(s):  
T. Charinpanitkul ◽  
W. Suthabanditpong ◽  
H. Watanabe ◽  
T. Shirai ◽  
K. Faungnawakij ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Dip Coating ◽  
Layer By Layer ◽  
Coating Method ◽  
Polyelectrolyte Film ◽  
Dip Coating Method

The Influence of Formula and Process on Physical Properties and the Release Profile of PVA/BSA Nanofibers Formed by Electrospinning Technique

2015 ◽  
Vol 31 ◽  
pp. 103-116 ◽  
Author(s):  
Chandra Risdian ◽  
Muhamad Nasir ◽  
Annisa Rahma ◽  
Heni Rachmawati
Keyword(s):  
Dip Coating ◽  
Differential Scanning Calorimetric ◽  
X Ray Diffraction ◽  
Successful Development ◽  
Electrospinning Technique ◽  
X Ray ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Electrospinning Method ◽  
Coating Method ◽  
Dip Coating Method

Electrospinning is a simple versatile process to produce nanofibers. However, it requires careful approach to form appropriates fibers for different purposes. This report describes aspects influencing successful development of nanofiber containing BSA using electrospinning method. Optical and scanning electron microscopy, energy dispersive X-Ray and Fourier transformed infrared spectroscopy, differential scanning calorimetric, and X-Ray diffraction analysis of nanofiber were performed. Modification of PVA/BSA nanofiber with Eudragit L-100 was conducted by dip coating method. The presence of BSA increased the diameter of the fibers. Modification of PVA/BSA nanofiber with Eudragit L-100 delayed the release of BSA in acidic medium but promoting its release in intestinal mimicking medium.

scholarly journals DESIGNING AND FABRICATION OF A LOW-COST DIP-COATER FOR RAPID PRODUCTION OF UNIFORM THIN FILMS

Química Nova ◽  
2021 ◽  
Author(s):  
David Castillo-Vilcatoma ◽  
Steveen Loarte ◽  
Arturo Fernandez-Chillcce ◽  
Elizabeth Pastrana ◽  
Roxana Pastrana
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Dip Coating ◽  
Oxide Glass ◽  
Step Motor ◽  
Control Panel ◽  
Layer By Layer ◽  
Ambient Conditions ◽  
Coating Method ◽  
Dip Coating Method

In this work, a self-made dip-coater equipment was developed for the fabrication of thin films. The assembly of the apparatus was carried out using simple mechanical and electronic pieces, recycle parts, and spending an inexpensive budget suitably. The production, software design, and features of the device were focused on the sol-gel dip-coating method, which involves gravitational draining and drying processes, as well as continued condensation reactions. The dip-coater was based on the Arduino microcontroller and a step motor. The immersion speed in the solution, the waiting time, and the withdrawal process were typed by a digital control panel, where the optimal range found for speed was 0.1 – 6.0 mm s-1 without vibration interferences. The total fabrication cost of the fabricated dip coater was less than 100 USD and the assembly process was not complicated. Finally, the performance of the dip-coater was evaluated through the deposit of copper oxide and iron oxide films on fluorine-doped tin oxide glass substrates layer by layer. The field emission scanning electron microscopy cross-section images confirm the formation of thin films with thickness in the nanoscale range, with good stability and sameness achieved through the control thickness during the dip-coating method under ambient conditions.

Characterization of Nickel-Antimony Doped Tin Oxide Electrodes Prepared via Sol-Gel Dip-Coating Method

2013 ◽  
Vol 734-737 ◽  
pp. 2155-2158 ◽  
Author(s):  
Yun Hai Wang ◽  
Zi Zhou Nie ◽  
Yong Rong Liang
Keyword(s):  
Tin Oxide ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Generation Efficiency ◽  
X Ray ◽  
Ozone Generation ◽  
Oxide Electrodes ◽  
Coating Method ◽  
Dip Coating Method

Nickel and antimony doped tin oxide (NATO) electrodes were prepared by sol-gel dip-coating method. The effect of doping levels was investigated via scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The electrochemical ozone generation efficiency was also tested. The results showed that sol-gel prepared electrodes had a smoother surface morphology and lower current efficiency for ozone generation than electrodes prepared by traditional pyrolysis method. The nickel and antimony doping lead to a decrease in the crystallites size, while its effects on ozone generation efficiency were complex.

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