The invention provides a sol-gel process for preparing a mixture of metal-oxide-metal compounds wherein at least one metal oxide precursor is subjected to a hydrolysis treatment to obtain one or more corresponding metal oxide hydroxides, the metal oxide hydroxides so obtained are subjected to a ...
The sol-gel method is firstly described taking the TiO2-SiO2 system as an example of the chemical procedure and its effect on the structure of the obtained material. The possibilities given by this low temperature synthesis are briefly described giving particular emphasis on so-called hybrid ...
In this paper,M-type hexagonal barium ferrite powders are synthesized using the sol-gel method.A dried precursor heated in air is analyzed in the temperature range from 50 to 1200 C using thermo-gravimetric analysis and differential scanning calorimetry.The effects of the additives and the cacinat...
A novel sol-gel method is applied for the preparation of solid-phase microextraction (SPME) fibers. Scanning electron microscopy experiments suggested a porous structure for the poly(dimethylsiloxane) (PDMS) coating. SPME-GC analysis provided evidence that the sol-gel fibers have some advantages, ...
Structural and optical properties of the BiFeO3 system multiferroic films prepared by a sol-gel method 热度: rat brain primary neurons immobilized in basement membrane gel threads an improved method for on-line 13c nmr spectroscopy of live cells ...
reaction and sol-gel method. DGEBA composites cured with 4,4′-diaminodiphenylmethane (DDM) containing 3 wt.% of DPHK achieved a V-0 rating in vertical flame spread tests (UL94) and LOI value of 29%, together with a strong suppression of released toxic fuel (carbon monoxide, CO), due...
TiO 2 precursors were prepared by the sol-gel method using titanium tetraisopropoxide. The effects of water and hydrochloric acid addition for the hydrolysis and polymerization reaction on the crystal lattice or the molecular structure, and on the crystallization behaviour of prepared precursors, were...
A sol-gel process is disclosed. The process includes the steps of creating a sol by dispersing an organic binder having Si—O backbone structure into de-ionized water together with fumed silica, injecting the dispersed sol into a mold to form a gel, drying the gel, removing organic ...
A new method to estimate the sol–gel transition entropy in physically gelling systemsA Clapeyron-type equation is presented to estimate the transition entropy for the sol–gel transition of physical gels, based on simple thermodynamics for the gels under load. The transition entropy and the ...
The effects of some synthesis parameters, such as alcohol/alcoxide and water/alcoxide molar ratios, type of solvent and reaction temperature, on the physical and crystalline characteristics of ZrO2prepared by the sol-gel method were studied. The results show that gelling time, weight loss, surface...