Nano-crystal V[sub 2]O[sub 5]nH[sub 2]O sol-gel films made by dip coating

2012 ◽  
Author(s):  
Orhan Özdemir ◽  
F. Pınar Gökdemir ◽  
U. Deneb Menda ◽  
Pelin Kavak ◽  
A. Evrim Saatci ◽  
...  
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Nano Crystal ◽  
Sol Gel Films

Ellipsometric Imaging of Drying Sol-Gel Films

1988 ◽  
Vol 121 ◽  
Author(s):  
Alan J. Hurd ◽  
C. Jeffrey Brinker
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Dip Coating ◽  
Drying Process ◽  
Imaging Ellipsometry ◽  
Withdrawal Velocity ◽  
Coated Film ◽  
Sol Gel Films ◽  
Physical And Chemical ◽  
Dip Coated Films

ABSTRACTAlthough controlled dip-coating is an established way to apply high quality uniform coatings, the details of the coating and drying process have not been deeply studied. Depending on the physical and chemical state of the sol and the parameters of dipping (dipping angle and speed), a variety of thicknesses and porosities can be achieved [1]. For optical coatings, the refractive index and optical thickness can thereby be controlled.We have developed a method to view the drying front of a dip-coated film using broad beam ellipsometry [2], or “ellipsometric imaging.” In dip-coated films we take full advantage of the fact that a steady state is quickly reached where the drying line velocity matches the withdrawal velocity; however, the technique might also be used in unsteady situations such as spin coating. Imaging ellipsometry makes it possible to measure the refractive index and thickness profiles of both wet and dry films point-by-point in an entire image at once. These profiles provide important clues as to the relative importance of gravity, evaporation and other phenomena.

Improving of Tribological Properties of Nanocomposites Sol-Gel Thin Films by Fluorocyclophosphazene Derivatives

2005 ◽  
Author(s):  
G. Celichowski ◽  
K. Chrobak
Keyword(s):  
Thin Films ◽  
Tribological Properties ◽  
Sol Gel ◽  
Dip Coating ◽  
Rf Plasma ◽  
Good Thermal Stability ◽  
Force Microscopy ◽  
Coating Method ◽  
Dip Coating Method ◽  
Sol Gel Films

Fluorocyclophospazenes’ derivatives were used as modifiers for improving tribological properties of thin films prepared by sol-gel technique. Thin films were made on the base of aminopropyltriethoxysilane (APTS). All films were deposited by dip-coating method and post-treated by heat, UV radiation and low pressure of RF plasma. Chemical changes in sol-gel films during all steps of post-treatments and modifications were monitored by FT-IR spectroscopy and SIMS spectrometry. Topographies of modified surfaces were imaged by Atomic Force Microscopy (AFM). After final modification significant improvements of frictional properties were observed as well as their very good thermal stability.

Preparation of Sol−Gel Films by Dip-Coating in Extreme Conditions

2010 ◽  
Vol 114 (17) ◽  
pp. 7637-7645 ◽  
Author(s):  
Marco Faustini ◽  
Benjamin Louis ◽  
Pierre A. Albouy ◽  
Monika Kuemmel ◽  
David Grosso
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Extreme Conditions ◽  
Sol Gel Films

Sol-Gel Films With Tailored Microstructures

1992 ◽  
Vol 271 ◽  
Author(s):  
Deborah L. Logan ◽  
Carol S. Ashley ◽  
C. Jeffrey Brinker
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Film Deposition ◽  
Organic Species ◽  
Fractal Clusters ◽  
Acid And Base ◽  
Before And After ◽  
Sol Gel Films ◽  
Film Porosity ◽  
Dip Coated Films

ABSTRACTThe refractive index and porosity of silicate films formed by dip-coating were tailored by varying the aging time of a two-step acid- and base-catalyzed sol to control the size and structure of the polymeric species prior to coating. 29Si NMR showed that there was a 2% increase in the total number of bridging oxygens with sol age, consistent with a cluster-cluster growth mechanism. However, several percent monomer remained regardless of aging. Dip-coated films were characterized by ellipsometry before and after heating to moderate temperatures at three rates. Sol aging prior to film deposition leads to greater film porosity, consistent with the concept of aggregation of fractal clusters, but only after a heat treatment to remove the organic species associated with incompletely hydrolyzed monomers from the pores.

scholarly journals Optimization of Ormosil Glasses for Luminescence Based Dissolved Oxygen Sensors

2010 ◽  
Vol 161 ◽  
pp. 1-11 ◽  
Author(s):  
J. Palmeira ◽  
L. Lopes ◽  
A.J. Silva ◽  
P.A.S. Jorge ◽  
A. Oliva
Keyword(s):  
Dissolved Oxygen ◽  
Optical Sensors ◽  
Ruthenium Complex ◽  
Oxygen Sensing ◽  
Sol Gel ◽  
Dip Coating ◽  
Oxygen Sensors ◽  
Quenching Efficiency ◽  
Sol Gel Films ◽  
The Impact

In the recent years, sol-gel films have been intensively used in optical sensors configurations. Due to its hydrophobic nature, ormosil films have been reported to be a promising supporting matrix for oxygen sensing dyes for measurements in aqueous media. In this work, the impact of the sol-gel host fabrication parameters in the characteristics of the resulting oxygen sensing membranes is thoroughly evaluated. Different combinations of organic-inorganic precursors, with different aging times, were tested as oxygen sensors. All the solution were doped with ruthenium complex Ru(II)-tris(4,7-diphenyl-1,10-phenanthroline) to introduce oxygen sensitivity. Thin films were produced by dip coating of glass slides. The oxygen sensitive films were tested in aqueous phase in equilibrium with different oxygen gas compositions, using a phase-modulation technique. Sensor performance parameters such as Stern-Volmer constant, quenching efficiency and lifetime response are reported. The data obtained clearly indicates that increased aging times and longer organic groups produce sensors with the highest sensitivity to dissolved oxygen. From all sol-gel films produced, the BTEOS:TEOS (1:1) mixture is the most promising for sensor construction.

Effect of Different Dip-Coating Techniques on TiO2 Thin Film Properties

2016 ◽  
Vol 721 ◽  
pp. 128-132 ◽  
Author(s):  
Kaspars Malnieks ◽  
Gundars Mezinskis ◽  
Ilona Pavlovska
Keyword(s):  
Thin Film ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Soda Lime ◽  
Nanorod Array ◽  
Dip Coating ◽  
Film Structure ◽  
Glass Slides ◽  
Soda Lime Silicate Glass ◽  
Sol Gel Films

TiO2 three-layer sol-gel films have been deposited on soda-lime silicate glass slides and dried in two different ways to study the effect of drying on thin film structure. The structural properties, surface topography and photocatalytic activity of the films were studied by X-ray diffraction, atomic force microscopy, and by analysing photocatalytic degradation of methyl orange, respectively. The titanium oxide sol-gel layers on glass slides dried at 20 °C before the deposition of next layers after final calcination at 500 °C resulted in a nanorod array film with good photocatalytic activity.

Modification of Electroless Nickel-Plating Coatings with Sol-Gel Film

2005 ◽  
Vol 475-479 ◽  
pp. 3835-3838 ◽  
Author(s):  
Hui Cong Liu ◽  
Liqun Zhu ◽  
Yan Bin Du
Keyword(s):  
Heat Treatment ◽  
Oxidation Resistance ◽  
Sol Gel ◽  
Electroless Nickel ◽  
Dip Coating ◽  
Treatment Temperature ◽  
Gel Film ◽  
Sol Gel Films ◽  
Corrosion And Oxidation

Four Sol-Gel films were developed by dip-coating electroless nickel-plated samples in different Sols, followed by heat treatment. The effects of the coating times and heat treatment temperature on the corrosion, oxidation resistance and wearing quality of the modified coating were examined. Results show that, after six coating, Sol-Gel films obtained can provide good corrosion and oxidation resistance, and their anti-corrosion quality remains high even after being oxidized at 500 °C for 60 hours. Addition of inorganic molybdenum salt or chromate into the Ti Sol also makes the wearing quality of the Sol-Gel film better.

Full Investigation of Angle Dependence in Dip-Coating Sol–Gel Films

2017 ◽  
Vol 121 (25) ◽  
pp. 6220-6225 ◽  
Author(s):  
Thomas Bottein ◽  
Jérôme Loizillon ◽  
David Grosso
Keyword(s):  
Sol Gel ◽  
Dip Coating ◽  
Angle Dependence ◽  
Sol Gel Films ◽  
Full Investigation

In-Situ Study of NiO Growth on Textured Nickel Tape Using Environmental Scanning Electron Microscope (ESEM) and Hot Stage

2001 ◽  
Vol 7 (S2) ◽  
pp. 1276-1277
Author(s):  
Y. Akin ◽  
R.E. Goddard ◽  
W. Sigmund ◽  
Y.S. Hascicek
Keyword(s):  
Buffer Layer ◽  
Lattice Mismatch ◽  
Sol Gel ◽  
Surface Oxidation ◽  
Dip Coating ◽  
Buffer Layers ◽  
Superconducting Film ◽  
Environmental Scanning ◽  
Cold Rolling And Annealing

Deposition of highly textured ReBa2Cu3O7−δ (RBCO) films on metallic substrates requires a buffer layer to prevent chemical reactions, reduce lattice mismatch between metallic substrate and superconducting film layer, and to prevent diffusion of metal atoms into the superconductor film. Nickel tapes are bi-axially textured by cold rolling and annealing at appropriate temperature (RABiTS) for epitaxial growth of YBa2Cu3O7−δ (YBCO) films. As buffer layers, several oxide thin films and then YBCO were coated on bi-axially textured nickel tapes by dip coating sol-gel process. Biaxially oriented NiO on the cube-textured nickel tape by a process named Surface-Oxidation- Epitaxy (SEO) has been introduced as an alternative buffer layer. in this work we have studied in situ growth of nickel oxide by ESEM and hot stage.Representative cold rolled nickel tape (99.999%) was annealed in an electric furnace under 4% hydrogen-96% argon gas mixture at 1050°C to get bi-axially textured nickel tape.

Porous Gel Coatings Obtained by Phase Separation in ORMOSIL System

2000 ◽  
Vol 628 ◽  
Author(s):  
Kazuki Nakanishi ◽  
Souichi Kumon ◽  
Kazuyuki Hirao ◽  
Hiroshi Jinnai
Keyword(s):  
Phase Separation ◽  
Reaction Time ◽  
Volume Fraction ◽  
Sol Gel ◽  
Reaction Times ◽  
Dip Coating ◽  
Coating Solution ◽  
Coating Method ◽  
Gel Phase ◽  
Dip Coating Method

ABSTRACTMacroporous silicate thick films were prepared by a sol-gel dip-coating method accompanied by the phase separation using methyl-trimethoxysilane (MTMS), nitric acid and dimethylformamide (DMF) as starting components. The morphology of the film varied to a large extent depending on the time elapsed after the hydrolysis until the dipping of the coating solution. On a glass substrate, the films prepared by early dipping had inhomogeneous submicrometer-sized pores on the surface of the film. At increased reaction times, relatively narrow sized isolated macropores were observed and their size gradually decreased with the increase of reaction time. On a polyester substrate, in contrast, micrometer-sized isolated spherical gel domains were homogeneously deposited by earlier dippings. With an increase of reaction time, the volume fraction of the gel phase increased, then the morphology of the coating transformed into co-continuous gel domains and macropores, and finally inverted into the continuous gel domains with isolated macropores. The overall morphological variation with the reaction time was explained in terms of the phase separation and the structure freezing by the forced gelation, both of which were induced by the evaporation of methanol during the dipping operation.

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