scholarly journals Preparation of Micro-Patterned CaMn7O12 Ceramic Films via a Photosensitive Sol-Gel Method

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 650 ◽  
Author(s):  
Wang ◽  
Zhao ◽  
Wu ◽  
Duan
Keyword(s):  
Sol Gel ◽  
Calcium Nitrate ◽  
Chelating Agent ◽  
Dip Coating ◽  
Raw Material ◽  
Ceramic Film ◽  
Ceramic Films ◽  
Calcium Source ◽  
Sensitive Characteristics ◽  
Solvent Washing

Mn/acetylacetone chelate was synthesized using Mn(CH3COO)2·4H2O as raw material, methanol as the solvent, and acetylacetone as the chelating agent. The ultraviolet (UV)-absorption peak of the synthesized chelate was found around 298 nm. CaMn7O12 sol was subsequently prepared using the Mn/AcAc chelate as the Mn source and calcium nitrate as the calcium source. The UV test indicates that the CaMn7O12 sol has the UV-sensitive characteristics. Owing to its photo-sensitivity, micro-patterned CaMn7O12 ceramic film can be prepared without photoresist, only through dip-coating, drying, UV-irradiation, solvent-washing, and heat treatment. The magnetic test result indicates that the micro-patterned CaMn7O12 ceramic film has a saturation magnetization of 112.8 emu/cm3, which is close to that of non-patterned CaMn7O12 ceramic film.

scholarly journals Corrosion Behavior of Amorphous Sol–Gel TiO2–ZrO2 Nano Thickness Film on Stainless Steel

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 988
Author(s):  
Lidija Ćurković ◽  
Helena Otmačić Ćurković ◽  
Irena Žmak ◽  
Mihone Kerolli Mustafa ◽  
Ivana Gabelica
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Chelating Agent ◽  
Dip Coating ◽  
Emission Spectrometry ◽  
Aisi 316L ◽  
Corrosion Properties ◽  
Sol Gel Process

In this work, a single-layer TiO2–ZrO2 thin film is deposited on the AISI 316L austenitic stainless steel by the sol–gel process and the dip coating method to improve its corrosion resistance properties. For the sol preparation, titanium isopropoxide and zirconium butoxide are used as the precursors, yttrium acetate hydrate is used for the ZrO2 stabilization, i-propanol as the solvent, nitric acid as the catalyst, acetylacetone as the chelating agent, and the distilled water for the hydrolysis. The deposited films are annealed at 400 °C or 600 °C. Morphology and phase composition of the sol–gel TiO2–ZrO2 films and powders are analyzed by scanning electron microscopy (SEM) equipped with EDX detector and X-ray diffraction (XRD), respectively. The thickness of the sol–gel TiO2–ZrO2 films deposited on the stainless steel is determined by glow discharge optical emission spectrometry (GD-OES). The corrosion behavior of the stainless steel, coated by amorphous films, is evaluated in 3 wt% NaCl and 0.5 mol dm−3 HCl by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. It is found that the sol–gel TiO2–ZrO2 films with the amorphous structure, deposited by the sol–gel process, and calcined at 400 °C significantly enhance the corrosion properties of AISI 316L in both chloride media.

Study on Gas Sensing Properties of WO3 Thin Films

2007 ◽  
Vol 280-283 ◽  
pp. 319-322
Author(s):  
Miao Jiang ◽  
Feng Hou ◽  
Ting Xian Xu ◽  
Ming Xia Xu
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Sol Gel ◽  
Chelating Agent ◽  
Response Speed ◽  
Dip Coating ◽  
Tungstic Acid ◽  
Sensing Properties ◽  
Average Grain Size ◽  
Gas Sensing Properties

Tungsten oxide thin films were prepared by an inorganic-sol-gel dip-coating process, where the sol was obtained by adding citric acid, as chelating agent, to the ammonia solution of tungstic acid. The resultant thin films were a mixture of monoclinic and tetragonal phases of WO3 and, after being pretreated at 600°C and sintered at 650°C, the average grain size of the polycrystalline films was about 500 nm. The gas-sensing properties of WO3 thin films were tested at temperatures ranging from 500° to 600°C and in nitrogen gas containing 5vol% O2 or 5vol% H2. The WO3 sensors exhibited a good sensitivity and response speed at the temperature of 550°C.

Fabrication of Bi-2212 Films on Ag Substrate by Dip-Coating Method

2012 ◽  
Vol 512-515 ◽  
pp. 360-363 ◽  
Author(s):  
Jie Xu ◽  
Ming Ya Li ◽  
Xiao Yan Wang
Keyword(s):  
Sol Gel ◽  
Chelating Agent ◽  
Polyvinyl Butyral ◽  
Dip Coating ◽  
Metal Nitrates ◽  
Sol Gel Process ◽  
Ethylenediaminetetracetic Acid ◽  
Coating Method ◽  
Dip Coating Method ◽  
Ag Substrate

In this study, Bi2Sr2CaCu2Ox (Bi-2212) thick films on Ag substrate were fabricated using the dip-coating method. Firstly, the Bi-2212 powders were prepared by Sol-Gel process. Metal nitrates were used as starting materials and ethylenediaminetetracetic acid (EDTA) was used as chelating agent. Secondly, the resulting powders were used as solute, and polyvinyl butyral (PVB) was used as solvent to prepare suspension via stirring and ultrasonic vibration. Then the suspension was dip-coated on Ag substrate. After heat treatments, the phase compositions of the samples were characterized using the XRD. The microstructure was observed using SEM. Experimental results show that the sintering temperature strongly influence the phase formation of Bi–2212.

Research on Nano Porous Cu Films Prepared by Sol-Gel Method

2011 ◽  
Vol 415-417 ◽  
pp. 606-610 ◽  
Author(s):  
Hui Jun Zhang ◽  
Ming Yu Li ◽  
Qing Xuan Zeng ◽  
Chang Gen Feng
Keyword(s):  
Grain Size ◽  
Pore Size ◽  
Spin Coating ◽  
Sol Gel ◽  
Chelating Agent ◽  
Raw Material ◽  
Spin Coating Technique ◽  
Gel Method ◽  
Cu Films ◽  
Coating Technique

Nanocrystalline porous Cu films were prepared on glass subtrates by sol-gel spin coating technique with copper(II) acetate as raw material and NH(C2H2OH)2as chelating agent. The characteristics of films were analyzed by IR, TG-DTG, XRD and SEM. The structure of Cu films was remarkable influenced by sol concentration and PEG content. The effects of calcining temperature and the way of the gelation on grain size were discussed. The results showed that the pore size and density are homogeneous when the sol concentration was 0.6 mol/L and the PEG content was 0.35 g.

Sol-Gel Deposition of Electronic Ceramic Films.

1990 ◽  
Vol 180 ◽  
Author(s):  
J.M. Bell ◽  
B. Ben-Nissan ◽  
M. Anast ◽  
B.O. West ◽  
L. Spiccia ◽  
...  
Keyword(s):  
Sol Gel ◽  
Barium Copper Oxide ◽  
Ceramic Coatings ◽  
Dip Coating ◽  
Barium Copper ◽  
Ceramic Films ◽  
Coating Method ◽  
Yttrium Barium ◽  
Processing Defects ◽  
Dip Coating Method

ABSTRACTWe describe a dip-coating method of depositing thin electronic ceramic coatings on various substrates from sol-gel solutions. The solutions we use are alkoxide-based, although the specific formulations depend on the system being deposited. We are working with two electronic ceramic systems: barium titanate on glass, and alumina, and yttrium barium copper oxide on alumina. We discuss methods used to reduce and remove processing defects such as crazing, cracking and pin-holing. We are also studying the effects of varying the processing conditions (dipping, hydrolysis and firing) on the electronic properties of the films. Initial results on BaTiO3 indicate that it is better to deposit thin films (∼0.1 – 0.2μm) and build up the coating thickness by repeated dipping.

Properties of Transparent Color Coating Glass Fabricated by Sol-Gel Technology

2007 ◽  
Vol 544-545 ◽  
pp. 817-820
Author(s):  
Tae Yeoung Lim ◽  
Y.M. Park ◽  
Jong Hee Hwang ◽  
Chang Yeoul Kim ◽  
Cheol Y. Kim
Keyword(s):  
Sol Gel ◽  
Surface Hardness ◽  
Dip Coating ◽  
Raw Material ◽  
Light Transmittance ◽  
Withdrawal Speed ◽  
Coating Method ◽  
Transparent Color ◽  
Color Coating ◽  
Dip Coating Method

Color sol was fabricated and coated it on glass substrate using sol-gel method. Silicate sol prepared by the use of commercially available tetraethoxysilane(TEOS), tetramethoxysilane (TMOS), methoxysilane(MTSO), phenytrimethoxysilane(PTMS) as a raw material of alkoxysilane family, and C.I. solvent red 122 and C.I. solvent yellow 82 as a organic dye, and C.I. pigment blue 28 and C.I. pigment red 26 as a pigment. Colored thin films were fabricated with changing the withdrawal speed by dip coating method, and heat treatment at 100~400°C. The visible light transmittance of colored thin film was measured with UV/VIS spectrophotometer, the surface hardness measured by pencil test, the surface turbidity measured by haze meter, and the film thickness was measureded by Alpha-step surface profiler.

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.

scholarly journals STUDY OF PREPARATION AND CHARACTERIZATION OF HYDROXYAPATITE COATINGS BY SOL-GEL TECHNIQUE

2017 ◽  
Vol 19 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Sutapa Roy Ramanan ◽  
Ramanan Venkatesh
Keyword(s):  
Sol Gel ◽  
Calcium Nitrate ◽  
Dip Coating ◽  
Final Thickness ◽  
Cross Sectional ◽  
Glass Substrates ◽  
Smooth Interface ◽  
Hydroxyapatite Coatings ◽  
Coating Method ◽  
Dip Coating Method

Hydroxyapåtite (HAP) coatings were prepared on glass substrates by sol-gel dip coating method, using a isopropanol solution of calcium nitrate and 2-butanol solution of phosphorous pentoxide as starting precursors and mixing them to get a coating solution with Ca/P ratio of 1.67. The prepared coatings were dried at 150°C and subsequently  fired at 500°C to obtain dense coatings. Multilayer coatings were prepared to increase the final thickness. For some samples, SiO2, TiO2, Al2O, and Zr02 coatings modified the interface between the glass and HAP. X-ray diffraction, scanning electron microscopy, FTIR and DTA/TG were used for characterization. All the coatings obtained at 500°C in air had only crystalline hydroxyapatite phase, characteristics FTIR signature peaks of HAP and dense and smooth morphology with the apparent presence of micropores. The cross-sectional microstructure of the coatings showed presence of smooth interface.

Synthesis of Hydroxyapatite via Sol-Gel Dip-Coating Method on Ceramic Support

2015 ◽  
Vol 1113 ◽  
pp. 599-604
Author(s):  
Norliza Ibrahim ◽  
Rafizah Zaiton ◽  
Mohd Akmal Askalani
Keyword(s):  
Sol Gel ◽  
Calcium Nitrate ◽  
Xrd Analysis ◽  
Porous Ceramics ◽  
Dip Coating ◽  
Calcium Nitrate Tetrahydrate ◽  
Filling Material ◽  
Coating Method ◽  
Silica Alumina ◽  
Dip Coating Method

Hydroxyapatite (HA) has been used extensively in application of biomedical either in the form of porous ceramics, dense ceramics, powders or granules for gap filling or coatings for implants. Synthetic HA also has an excellent ion exchange properties that used as a filling material for chromatography columns. Furthermore, many researchers have reported that high removal efficiency of the heavy metals can be achieved by using synthetic HA. In this study, HA was synthesized via sol-gel method by using calcium nitrate tetrahydrate and triethyl phosphate as the precursors and 2-metoxiethanol ether as an organic solvent. Then, HA sol was deposited on silica-alumina based ceramics whose made by recycled sanitary ware waste by dip-coating method. The obtained coated substrates were then dried at 150°C and subsequently subjected to calcination up to 1000°C. Fourier Transform Infrared (FTIR) characterization for the HA powders dried at 150°C and calcined at 600°C, 800°C and 1000°C were carried out to come out with the spectral characteristic indicative of chemical bonding. High Purity of the obtained hydroxyapatite was confirmed by XRD analysis. The SEM micrographs displayed the microstructure of the HA coatings.

Phase separation in sol gel-derived ceramic films of silica-zirconia, alumina-zirconia, and titania-zirconia system

1994 ◽  
Vol 52 ◽  
pp. 646-647
Author(s):  
J. Tong ◽  
L. Eyring
Keyword(s):  
Fracture Toughness ◽  
Phase Separation ◽  
Sol Gel ◽  
Great Influence ◽  
High Strength ◽  
Chemical Durability ◽  
Separation Method ◽  
Toughening Mechanism ◽  
Ceramic Films ◽  
Zirconia Toughened Alumina

There is increasing interest in composites containing zirconia because of their high strength, fracture toughness, and its great influence on the chemical durability in glass. For the zirconia-silica system, monolithic glasses, fibers and coatings have been obtained. There is currently a great interest in designing zirconia-toughened alumina including exploration of the processing methods and the toughening mechanism.The possibility of forming nanocrystal composites by a phase separation method has been investigated in three systems: zirconia-alumina, zirconia-silica and zirconia-titania using HREM. The morphological observations initially suggest that the formation of nanocrystal composites by a phase separation method is possible in the zirconia-alumina and zirconia-silica systems, but impossible in the zirconia-titania system. The separation-produced grain size in silica-zirconia system is around 5 nm and is more uniform than that in the alumina-zirconia system in which the sizes of the small polyhedron grains are around 10 nm. In the titania-zirconia system, there is no obvious separation as was observed in die alumina-zirconia and silica-zirconia system.

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