Metallic Calcium as a Precursor for Sol-Gel Synthesis of CaCO3-SiO2 and CaO-SiO2 Systems

Ceramics ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 278-290
Author(s):  
Piotr Marciniak ◽  
Bogna Sztorch ◽  
Agnieszka Martyła ◽  
Agnieszka Czapik ◽  
Mikołaj Stodolny ◽  
...  
Keyword(s):  
Sol Gel ◽  
Phase Segregation ◽  
Calcium Content ◽  
Nitrogen Adsorption ◽  
Point Of View ◽  
Oxide Systems ◽  
Molar Ratios ◽  
High Calcium ◽  
Sol Gel Synthesis ◽  
Metallic Calcium

A series of binary oxide systems with Ca/Si molar ratios of 0.05, 0.1, 0.25, 0.5 and 1.0 have been synthesized by the sol-gel technique from tetraethyl orthosilicate (TEOS) and metallic calcium powder. Upon calcination, a side effect of wollastonite formation as a result of the reaction between the components of the material has been observed in the two calcium-richest systems. The increase in calcium content produces an effect of porosity promotion. At high calcium contents, the homogeneity of the systems is limited by the ability of silica to disperse the calcium component. The properties of these systems are determined by the silica surface coverage with a large amount of the scattered CaCO3 fine microcrystallites (calcite), resulting from the phase segregation. The gels were characterized by X-ray powder diffraction, low temperature nitrogen adsorption, transmission and scanning electron microscopy (TEM, SEM and SEM/EDS), thermogravimetric analysis (TGA), and FT-IR spectra, to describe the parameters important from the point of view of their application as a support for metal-based catalysts.

Sol-gel synthesis and characterization of Ag nanoparticles in ZrO2 thin films

2009 ◽  
Vol 24 (8) ◽  
pp. 2541-2546 ◽  
Author(s):  
Eisuke Yokoyama ◽  
Hironobu Sakata ◽  
Moriaki Wakaki
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Composite Films ◽  
Dip Coating ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Silver Surface ◽  
Molar Ratios ◽  
Sol Gel Synthesis

ZrO2 thin films containing silver nanoparticles were prepared using the sol-gel method with Ag to Zr molar ratios [Ag]/[Zr] = 0.11, 0.25, 0.43, 0.67, 1.00, 1.50, and 2.33. After dip coating on glass substrate, coated films were annealed at 200 and 300 °C in air. X-ray diffraction peaks corresponding to crystalline Ag were observed, but a specific peak corresponding to ZrO2 was not observed. At the molar ratio [Ag]/[Zr] = 0.25, the particle size of Ag distributed broadly centered at 17 nm for an annealing temperature of 200 °C and at 25 nm for 300 °C. The films annealed in air at 200 °C showed an absorption band centered at 450 nm because of the silver surface plasmon resonance, whereas films heated at 300 °C in air caused a red shift of the absorption to 500 nm. The absorption peak was analyzed using the effective dielectric function of Ag-ZrO2 composite films modeled with the Maxwell-Garnett expression.

Kinetic Calculations for the Calcination Reaction of Limestone Modified by Alkaline Industrial Wastes

2011 ◽  
Vol 356-360 ◽  
pp. 1175-1179 ◽  
Author(s):  
Hong Tao Liu ◽  
Kui Hua Han ◽  
Sheng Li Niu ◽  
Chun Mei Lu
Keyword(s):  
Calcium Content ◽  
Isoconversional Method ◽  
Differential Method ◽  
Point Of View ◽  
Industrial Wastes ◽  
Heating Rates ◽  
Metal Impurities ◽  
Carbide Slag ◽  
High Calcium ◽  
Kinetic Calculations

The enhancement of alkaline industrial wastes on the desulfurization performance and utilization of limestone has already been found. In order to explore the reason of this phenomenon from the kinetic point of view, two typical alkaline wastes, carbide slag with a high calcium content and Bayer process red mud with more metal impurities, were adopted to research. Kinetic behavior of calcination reaction was calculated using the isoconversional method of Kissinger-Akahira-Sunose method (a differential method) and Flynn-Wall-Ozawa method (an integral method) at four different heating rates: 10, 20, 40 and 80 K•min-1. Values calculated by these two methods are very close, and the calculated result shows that calcination rate constant of modified limestone is obviously greater than that of original limestone, under the same calcination temperature, which means that alkaline wastes are advantageous to the thermal decomposition of limestone.

Effect of the Sol-Gel Synthesis Parameters on the Incorporation of an Anti-inflammatory Drug in a Ceramic Material

2007 ◽  
Vol 1007 ◽  
Author(s):  
Aracely Hernandez ◽  
Patricia Esquivel-Ferriño ◽  
Idalia Gomez ◽  
Lucia Cantu
Keyword(s):  
Ceramic Material ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Molar Ratio ◽  
Inflammatory Drug ◽  
Synthesis Conditions ◽  
Synthesis Parameters ◽  
Anti Inflammatory ◽  
Drug Incorporation ◽  
Sol Gel Synthesis

ABSTRACTIn the present work, sol-gel method was used to incorporate in a ceramic material a non steroidal anti-inflammatory drug (piroxicam) as model drug. The incorporation of the drug in the SiO2 network was carried out at different sol-gel synthesis parameters, such as pH (3 and 5) and the alkoxide/water ratio (1:6 and 1:8). The biomaterial obtained was analyzed by thermal analysis TGA-DTA, infrared spectroscopy (FTIR), Scanning Electronic Microscopy (SEM) and X-ray diffraction (XRD); specific surface area and porosity were analyzed from nitrogen adsorption isotherm. Better drug incorporation into the material was achieved at the synthesis conditions of pH 5 and 1:6 alkoxide/water molar ratio.

Template Sol-Gel Synthesis of Phosphorescent Mesoporous Silica Film Nanocomposites Using an Amphiphilic Gold (I) Pyrazolate Complex

2011 ◽  
Vol 364 ◽  
pp. 55-59 ◽  
Author(s):  
Hendrik O. Lintang ◽  
Kazushi Kinbara ◽  
Takuzo Aida
Keyword(s):  
Mesoporous Silica ◽  
Sol Gel ◽  
Silica Film ◽  
Aqueous Alcohol ◽  
Molar Ratios ◽  
Silica Source ◽  
Aqueous Alcohol Solution ◽  
Mesoporous Silica Film ◽  
Sol Gel Synthesis ◽  
Film Nanocomposites

Herein novel mesoporous silica film nanocomposites are successfully synthesized by using phosphorescent columnar assembly of an amphiphilic trinuclear gold (I) pyrazolate complex [Au3Pz3] as a functional template in the sol-gel synthesis. By controlling the molar ratios of silica source tetrabutylorthosilicate (TBOS) to [Au3Pz3] in an acidic aqueous alcohol solution from 60:1 to 20:1, highly ordered phosphorescent nanocomposites can be fabricated with hexagonal [Au3Pz3]/silicahexand lamellar [Au3Pz3]/silicalamsilicates.

Preparation of Mesoporous Carbon Membranes for Ultrafiltration with Properties of Environmental Materials

2012 ◽  
Vol 600 ◽  
pp. 104-107 ◽  
Author(s):  
Wei Wei ◽  
Na Li ◽  
Guo Tong Qin
Keyword(s):  
Mesoporous Carbon ◽  
Pure Water ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Supercritical Drying ◽  
Carbon Membrane ◽  
Carbon Membranes ◽  
Environmental Materials ◽  
Sol Gel Synthesis ◽  
Important Kind

Ultrafiltration carbon membrane is an important kind of environmental materials for removal of particular and macromolecular pollutants. The mesoporous carbon membranes were synthesized via sol-gel synthesis followed by supercritical drying and carbonization. The formaldehyde and resorcinol were used as original precursor. The membrane was analyzed using nitrogen adsorption. It was found that the carbon membrane was mesoporous material. The pure gases of H2, N2 and CO2 were used to characterize the selective and integrity of the carbon membrane. The gas permeance through the mesoporous carbon membrane is predominantly governed by the Knudsen mechanism. The pure water is 13.4 L•m-2•h-1 and the molecular weight cut-off is about 2000.

Sol-gel Synthesis of Li–ZrSiO4

2000 ◽  
Vol 15 (7) ◽  
pp. 1490-1495 ◽  
Author(s):  
Heriberto Pfeiffer ◽  
Pedro Bosch ◽  
Jose A. Odriozola ◽  
Alberto Lopez ◽  
Jorge A. Ascencio ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Molar Ratio ◽  
Spectroscopy Analysis ◽  
Gel Method ◽  
X Ray ◽  
Cell Parameters ◽  
Molar Ratios ◽  
Sol Gel Synthesis

Li–ZrSiO4 was synthesized by the sol-gel method. Reactions were performed with different Li:Zr molar ratios: 1, 3, 5, and 6. Cell parameters changed as follows: a0 decreased and c0 increased as the Li:Zr molar ratio increased. The x-ray photoelectron spectroscopy analysis showed two kinds of oxygen atoms. The first one was attributed to ZrSiO4 oxygens. The second one was attributed to Li–O bonds. All these results were supported by a theoretical analysis. It was concluded that lithium atoms were held in interstitial positions of the ZrSiO4 structure.

The effect of the structure of Cu–Ti oxide systems obtained by sol–gel synthesis on the nature of catalytic centres and catalytic activity in low-temperature CO oxidation

1998 ◽  
Vol 8 (3) ◽  
pp. 102-104 ◽  
Author(s):  
Elena A. Trusova ◽  
Mark V. Tsodikov ◽  
Evgenii V. Slivinskii ◽  
Gustavo G. Hernandez ◽  
Olga V. Bukhtenko ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Co Oxidation ◽  
Sol Gel ◽  
Oxide Systems ◽  
Low Temperature Co Oxidation ◽  
Sol Gel Synthesis

scholarly journals Sol–Gel Synthesis of Ce4–xSr1+xFe5–xZnxO14+δ[0 ≤x≤ 0.45] Superparamagnetic Oxide Systems and Its Magnetic, Dielectric, and Drug Delivery Properties

ACS Omega ◽  
2018 ◽  
Vol 3 (12) ◽  
pp. 16509-16518
Author(s):  
Venkatesan Thangaraj ◽  
Murugesan Yogapriya ◽  
Kuppulingam Thirumalai ◽  
Meenakshisundaram Swaminathan ◽  
Anandhakumar Sundaramurthy ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Sol Gel ◽  
Oxide Systems ◽  
Sol Gel Synthesis ◽  
Magnetic Dielectric

scholarly journals Development of an Adsorbing System Made of DMS-1 Mesh Modified by Amino Groups to Remove Pb(II) Ions from Water

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1914
Author(s):  
Viviana Palos-Barba ◽  
Cecilia Lugo-Nabor ◽  
Rodrigo R. Velázquez-Castillo ◽  
Dora Alicia Solís-Casados ◽  
Carmen L. Peza-Ledesma ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Good Alternative ◽  
Ex Situ ◽  
Amino Groups ◽  
X Ray ◽  
Molar Ratios ◽  
Adsorption Processes

Water pollution by heavy metals represents several health risks. Conventional technologies employed to eliminate lead ions from residual or drinking water are expensive, therefore an efficient and low-cost technique is required and adsorption processes are a good alternative. In this work, the goal was to determine the adsorption capacity of a Disordered Mesoporous Silica 1 material (DMS-1) functionalized with amino groups, for Pb(II) ions removal. DMS-1 was prepared by sol-gel method and the incorporation of amino groups was performed by ex-situ method. As the source of amine groups, (3-Aminopropyl) triethoxysilane (APTES) was used and three different xNH2/DMS-1 molar ratios (0.2, 0.3, 0.4) were evaluated. In order to evaluate the incorporation of the amino group into the mesopore channels, thermal and structural analysis were made through Thermogravimetric Analysis (TGA), nitrogen adsorption–desorption at 77 K by Specific Brunauer–Emmett–Teller (SBET) method, Fourier Transfer Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and X-Ray Photoelectron Spectroscopy (XPS). The higher Pb(II) ions removal was achieved with the 0.3 molar proportion of xNH2/DMS-1 reaching 99.44% efficiency. This result suggests that the functionalized material can be used as an efficient adsorbent for Pb(II) ions from aqueous solution.

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