Sol-Gel Coating Method Research Articles

Hybrid Organic–Inorganic Materials Prepared by Sol–Gel and Sol–Gel-Coating Method for Biomedical Use: Study and Synthetic Review of Synthesis and Properties

The need to improve the expectancy and quality of life of subjects affected by disabling pathologies that require the replacement or regeneration of tissues or parts of the body has fueled the development of innovative, better-performing materials that are capable of integrating into and being tolerated by body tissues. Materials with these characteristics, i.e., bio-functionality, bio-safety, and biocompatibility, are defined as biomaterials. One of the many methods for producing such materials is the sol–gel technique. This process is mainly used for the preparation of ceramic oxides at low temperatures, through hydrolysis and polycondensation reactions of organometallic compounds within a hydroalcoholic solution. This study is based on a specific type of biomaterial: organic–inorganic hybrids. The aim of this study is to provide an overview of the advantages and disadvantages of the sol–gel technique, as well as describe the preparation and chemical and biological characterization, uses, and future prospects of these biomaterials. In particular, the use of plant drugs as organic components of the hybrid material is the innovation of this manuscript. The biological properties of plant extracts are numerous, and for this reason, they deserve great attention from the scientific community.

Nano-Rod MxWO3 Formation by Sol-Gel Coating Method and Its Electrochromic Application

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Preparation and Properties of PLT/CDC Composites by Using Sol-Gel Coating Method

Preparation and Properties of PLT/CDC Composites by Using Sol-Gel Coating Method

Solid-phase microextraction coupled with capillary electrophoresis to determine ephedrine derivatives in water and urine using a sol–gel derived butyl methacrylate/silicone fiber

A sensitive method for determination of ephedrine derivatives using headspace solid-phase microextraction (SPME) with a novel fiber followed by capillary electrophoresis has been developed. The co-poly(butyl methacrylate/hydroxy-terminated silicone oil) (BMA/OH-TSO) was used as stationary phases with the aid of γ-methacryloxypropyltrimethoxysilane (KH-570) as bridge in SPME using sol–gel-coating method and cross-linking technology. It has high extraction efficiency for ephedrine derivatives in comparison with commercial poly(dimethylsiloxane) and poly(acrylate)-coated fiber. The coating exhibits good thermal and solvent stability as well as long lifetime. A simple and flexible device for desorption of analytes after headspace SPME was constructed. The effect of various experimental parameters for SPME (temperature, time, pH, ionic strength, desorption solvent, etc.) were discussed. Field amplified sample injection (FASI) was applied for on-line sample concentration and a sensitivity enhancement of two orders of magnitude was achieved. Linear ranges were found to be 20–5000 ng/ml. The detection limits for (1R,2S)-ephedrine, (1R,2R)-pseudoephedrine and (1S,2S)-pseudoephedrine were 3, 5 and 5 ng/ml, respectively. Relative standard deviation ( n = 6) was found to be 4.96–7.57%. The method was successfully applied to the analysis of ephedrine derivatives in human urine.

Fabrication of an Anode-Supported Sofc with a Sol-Gel Coating Method for a Mixed-Gas Fuel Cell

An anode-supported type solid oxide fuel cell (SOFC) is a promising structure resulting in a very high performance because it consists of a very thin electrolyte. In the preliminary stage, we have succeeded in the fabrication of Samaria-Doped Ceria (SDC) thin film on a porous Ni-Al substrate using a sol-gel coating technique. The thin electrolyte film binds the substrate well and a single cell made with the SDC thin-film electrolyte and porous LSM cathode exhibited a good performance in a mixed-gas condition, even at intermediate temperatures. The single cell, consisting of 20 µm thin SDC electrolytes, the porous Ni-Al anode substrate, and a LSM cathode, exhibited an open circuit voltage of 0.82V and a maximum power density of 0.31 W.cm-2 at 700°C with humidified methane and air mixtures. This cell also generated an open circuit voltage of about 1.1V and a maximum power density of 0.34 W.cm-2 at 600°C with humidified hydrogen as the fuel and air as the oxidant.

Preparation of Li4/3Ti5/3O4 Thin Film Electrodes by a PVP Sol—Gel Coating Method and Their Electrochemical Properties.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Preparation of Li4 / 3Ti5 / 3 O 4 Thin Film Electrodes by a PVP Sol-Gel Coating Method and Their Electrochemical Properties

A thin film electrode for rechargeable lithium batteries was prepared by a sol-gel coating method with poly(vinylpyrrolidone) (PVP). A Li-Ti-O sol was successfully prepared by using PVP. The sol coated on Au substrate with a spin coater was converted to a gel film through a spin coating process. The Li-Ti-O gel film was heated at various temperatures for 1 h. The prepared thin films were characterized with both X-ray diffraction method and scanning electron microscopy. These analyses indicated that the prepared film belonged to a spinel structure and had a uniform morphology. Electrochemical properties of the prepared electrode films were evaluated by using a discharge and charge test, cyclic voltammogram, and impedance spectroscopy in a mixed solvent of ethylene carbonate and diethyl carbonate (1:1 in volume) with 1.0 mol dm−3 From these results, it can be said that the thin film electrode prepared at 600°C for 1 h had excellent electrochemical properties. A chemical diffusion coefficient of ion in the thin film electrode was estimated to be cm2 s−1 by using an impedance measurement at 1.59 V vs. The above results indicate that the film prepared through the sol-gel coating method with PVP can be used as an anode with a fast electrochemical response for rechargeable lithium batteries. © 2003 The Electrochemical Society. All rights reserved.

Preparation of YSZ Coated AISI-Type 316L Stainless Steel by the Sol-Gel Coating Method and Its Corrosion Behavior in Molten Carbonate

The effect of heat-treatment conditions on the corrosion behavior of yttria stabilized zirconia (YSZ) coated AISI-type 316L stainless steels in molten carbonate are investigated. YSZ films on stainless steel were prepared by the sol-gel method. While the sample heat-treated at 800°C for 2 hours in air has an uneven surface microstructure with macrocracks, a YSZ coated sample heat-treated in argon has an even microstructure. The polarization resistance and corrosion rate of YSZ coated sample heat-treated in air were deteriorated from 6.948 Ωcm2 and 364.7 mpy (millimeter per year) to 3.291 Ωcm2 and 769.8 mpy, respectively, by the corrosion for 100 hours due to its poor surface microstructures. At the same experimental condition, meanwhile, those corrosion parameters of YSZ coated sample heat-treated in argon were 15.43 Ωcm2 and 164.2 mpy, respectively, and those were improved to 18.83 Ωcm2 and 134.6 mpy after the corrosion for 100 hours. This is attributed to the YSZ film with well developed surface microstructures. The concentration profiles of elements and X-ray diffractograms indicate that the oxide layer of YSZ coated sample heat-treated in argon had a triple layer structure composed of outer YSZ film, in between Fe2O3 layer, and inner chromium rich layer during corrosion.

High extraction efficiency solid-phase microextraction fibers coated with open crown ether stationary phase using sol–gel technique

In this paper, the open crown ether α, ω-diallyltriethylene glycol/hydroxyl-terminated silicone oil was used as stationary phases with the aid of vinyltriethoxylsilane as bridge in solid-phase microextraction using sol–gel-coating method and cross-linking technology. It has high extraction efficiency for both polar and non-polar analytes in comparison with poly(dimethylsiloxane) and carbowax–divinylbenzene-coated fiber. Limits of detection of the polar compound phenols are from 0.32 to 2.6 ng ml −1 and the precisions are from 2.5 to 3.5% ( n=5), while the limits of detection of the non-polar benzene, toluene and xylenes are 0.03–0.3 ng ml −1 and the relative standard deviation ( n=5) is found to be 2.1–5.2%. The novel coating proved to be very stable at high temperature by investigating it with the extraction of high-boiling compound phthalate esters.