scholarly journals Characterization of calcium oxide in root perforation sealer materials

2012 ◽  
Vol 23 (5) ◽  
pp. 539-546 ◽  
Author(s):  
Carlos Estrela ◽  
Manoel Damião Sousa-Neto ◽  
Orlando Aguirre Guedes ◽  
Ana Helena Gonçalves Alencar ◽  
Marco Antonio Hungaro Duarte ◽  
...  
Keyword(s):  
Calcium Oxide ◽  
Mineral Trioxide Aggregate ◽  
Chemical Compounds ◽  
Internal Diameter ◽  
X Ray ◽  
Final Sample ◽  
Materials Used ◽  
Main Components ◽  
White Mineral

Root perforation represents an undesirable complication that may lead to an unfavorable prognosis. The aims of this study were to characterize and to compare the presence of calcium oxide (CaO) on the chemical composition of materials used for root perforation therapy: gray and white mineral trioxide aggregate (MTA) and Portland cement (PC), gray MTA+5%CaO and gray MTA+10%CaO. The last two materials were analyzed to evaluate the increase of CaO in the final sample. CaO alone was used as a standard. Eighteen polyethylene tubes with an internal diameter of 3 mm and 3 mm in length were prepared, filled and then transferred to a chamber with 95% relative humidity and a temperature of 37ºC. The chemical compounds (particularly CaO) and the main components were analyzed by energy-dispersive X-ray microanalysis (EDX). EDX revealed the following concentrations of CaO: gray MTA: 59.28%, white MTA: 63.09%; PC: 72.51%; gray MTA+5%CaO: 63.48% and gray MTA+10%CaO: 67.55%. The tested materials presented different concentrations of CaO. Even with an increase of 5 and 10% CaO in gray MTA, the CaO levels found in the MTA samples were lower than those found in PC.

Free Na and Less Fe Compositions of SiO2 Extracted from Rice Husk Ash as the Silica Source for Synthesis of White Mineral Trioxide Aggregate

2020 ◽  
Vol 840 ◽  
pp. 311-317
Author(s):  
Muhamad Ghadafi ◽  
Sri Juari Santosa ◽  
Yuichi Kamiya ◽  
Nuryono Nuryono
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Mineral Trioxide Aggregate ◽  
Deionized Water ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silica Source ◽  
Tricalcium Aluminate ◽  
White Mineral

In this research, we report the use of free sodium and less Fe ion silica (SiO2) for preparation of White Mineral Trioxide Aggregate (WMTA). SiO2 was extracted from rice husk ash (RHA) using NaOH 2 M and HCl 37% (v/v) and removal of Na was performed by washing the extracted SiO2 using deionized water with various volumes and techniques. Before extraction, RHA was calcined at a temperature of 700 °C for 3 h. Preparation of WMTA began with mixing the extracted SiO2 20%, CaO 60%, Al2O3 2%, and Bi2O3 18% (w/w). The mixture was calcined at temperatures of 1100 °C for 4 h, grounded to produce WMTA 200 mesh in size and then was characterized using Fourier Transformed Infrared (FTIR) spectrophotometer, X-ray Diffraction (XRD) and Scanning Electron Microscopy-Energy Dispersion X-ray (SEM-EDX). The WMTA characteristics were compared to that of the commercial WMTA ProRoot. The result shows that the silica that was potential as the silica source for WMTA preparation was extracted from RHA involving sonication and washing with 360 mL of deionized water per 10 g of RHA. It contained SiO2 of 94.2%, Fe2O3 of 0.03%, no Na2O, and the particle size of 1.51±0.46 µm. The characterization of WMTA shows that produced WMTA contained tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A) and BiO2, which is comparable to the commercial WMTA ProRoot.

Synthesis and Characterization of White Mineral Trioxide Aggregate Using Precipitated Calcium Carbonate Extracted from Limestone

2020 ◽  
Vol 840 ◽  
pp. 330-335
Author(s):  
Maulidia Fa'izzah ◽  
Widjijono Widjijono ◽  
Yuichi Kamiya ◽  
Nuryono Nuryono
Keyword(s):  
Oxide Catalyst ◽  
Mineral Trioxide Aggregate ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Precipitated Calcium Carbonate ◽  
X Ray ◽  
Aluminum Oxide Catalyst ◽  
Tricalcium Aluminate ◽  
White Mineral

White Mineral Trioxide Aggregate (WMTA) using precipitated CaCO3 (PCC) from limestone has been synthesized. PCC in calcite structure was extracted from limestone by calcination at 900 °C for 3 h, dissolved in 0.8 M nitric acid solution and followed with carbonation for 60 minutes. PCC was used for the synthesis of WMTA by mixing with tetraethoxyorthosilicate, bismuth oxide, aluminum oxide, catalyst of with HNO3 and NH3 solution and thermally treated at 1100 °C for 3 h. The products were characterized with Thermal Gravimetric Analysis-Differential Thermal Analysis (TGA-DTG), X-ray Diffraction (XRD), Frontier-Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM) and X-ray Fluorescence (XRF). The results showed that the PCC dominated calcite structure was obtained with 75.25% in yield and 99.42% in purity. The WMTA has been successfully synthesized by low thermal treatment at 1100 °C using catalysts of HNO3 and NH3 solution, proven by the presence of tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A), and Bi2O3 in WMTA.

scholarly journals GC-MS Chemical Characterization of Main Components of Smilax Domingensis Wild. in Cuba

2018 ◽  
Vol 5 (4) ◽  
pp. 79 ◽  
Author(s):  
Pilar A. Soledispa ◽  
José González ◽  
Armando Cuéllar ◽  
Julio Pérez ◽  
Max Monan
Keyword(s):  
Mass Spectra ◽  
Chemical Constituents ◽  
Chemical Characterization ◽  
Ethanolic Extract ◽  
Chemical Compounds ◽  
Chemical Components ◽  
Analytical Technique ◽  
Main Components ◽  
First Time

A preliminary chemical characterization of main components of ethanolic extract with dried rhizomes of Smilax domingensis Wid. that grow in Cuba was done using a GCMS-QP2010 Ultra Shimadzu and the mass spectra of the compounds found in the extract was matched with the National Institute of Standards and Technology (NIST) library. After sample derivatization 125 chemical compounds were registered by the equipment and from them, 35 different chemical components were characterized and reported for the first time from this part of the plant in our country. The results demonstrate the developed method could be employed as a rapid and versatile analytical technique for identification of chemical constituents and quality control of Smilax domingensis.

Applications of X-ray microdiffraction in the imaging industry

2006 ◽  
Vol 21 (2) ◽  
pp. 91-96 ◽  
Author(s):  
Thomas N. Blanton
Keyword(s):  
Case Studies ◽  
Digital Imaging ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure Morphology ◽  
Materials Used ◽  
Characterization Of Materials

Characterization of materials used in the digital imaging industry has been performed using micro X-ray diffraction (microXRD) techniques. Case studies are described that demonstrate the use of microXRD for identification of phases, texture, and microstructure morphology of components used in imaging applications.

scholarly journals CALCIUM OXIDE CHARACTERISTICS PREPARED FROM AMBUNTEN’S CALCINED LIMESTONE

2018 ◽  
Vol 5 (1) ◽  
pp. 65 ◽  
Author(s):  
Fatimatul Munawaroh ◽  
Laila Khamsatul Muharrami ◽  
Triwikantoro Triwikantoro ◽  
Zaenal Arifin
Keyword(s):  
Calcium Carbonate ◽  
Chemical Composition ◽  
Calcium Oxide ◽  
Crystalline Phase ◽  
Wave Number ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Characteristics

<pre>Calcium oxide (CaO) and calcium carbonate (CaCO3) are widely used in industry. CaO and CaCO3 can be synthesized or derived from limestone. The purpose of this study to determine the characteristics of CaO calcined limestone from Ambunten Sumenep. Lime in calcined at 850 ° C for 6 hours. Characterization of X-ray fluorescence (XRF) was conducted to determine the chemical composition of limestone, X-ray diffraction test (XRD) to find the lime crystalline phase and FTIR test to determine the absorption of wave number. XRF test results showed that the limestone chemical composition consisted of Ca of 95.37% as the dominant element, Mg of 4.1%, Fe 0.17% and Y by 0.39%. The XRD test results showed that the limestone crystal phase is ankerite (Ca [Fe, Mg] [CO3] 2) and after the calcined phase calcination is vaterite (Ca [OH] 2), calcite (CaO) and calcite (CaCO3). While the FTIR test results show that the CaO spectra are seen at 3741.24, 1417.12 and 874.14 cm</pre><sup>-1</sup><pre>.</pre>

Structural Characterization of Mg-0.5Ca-xY Biodegradable Alloys

2018 ◽  
Vol 782 ◽  
pp. 129-135 ◽  
Author(s):  
Bogdan Istrate ◽  
Corneliu Munteanu ◽  
Ștefan Lupescu ◽  
Vasile Iulian Antoniac ◽  
Eusebiu Sindilar
Keyword(s):  
Hexagonal Lattice ◽  
Melting Furnace ◽  
Alloying Elements ◽  
Induction Melting ◽  
X Ray Diffraction ◽  
X Ray ◽  
Materials Used ◽  
Biodegradable Magnesium ◽  
Sem Analyses

In recent years, researchers have been able to identify new materials with special properties that can be used in major medical fields. Magnesium-based materials used in orthopedics are an important alternative, being the third generation of biocompatible materials. A biodegradable magnesium-based material has the ability to degrade at a certain rate, is biocompatible, and together with other alloying elements ensures osteointegration. Mg-0.5Ca-xY biodegradable alloys will be developed in an induction melting furnace using ceramic crucibles, melting at 710-720 °C in the controlled atmosphere of 5.0 Ar. SEM analyses and X-ray diffraction reveals the size distribution of Mg-sized grains, with a hexagonal lattice and formation of compounds with the two alloying elements: Mg2Ca, Mg2Y, Mg24Y5uniformly arranged in the α-Mg matrix. The alloying elements influence the microstructure, the size of the α-Mg grains decreasing considerably.

scholarly journals Characterization of Roman and Arabic Mural Paintings of the Archaeological Site of Cercadilla (Cordoba, Spain)

Scanning ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Andrea Gil-Torrano ◽  
Auxiliadora Gómez-Morón ◽  
José María Martín ◽  
Rocío Ortiz ◽  
Mª del Camino Fuertes Santos ◽  
...  
Keyword(s):  
Archaeological Site ◽  
Mural Painting ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mural Paintings ◽  
Thermal Zone ◽  
Chronological Sequence ◽  
Ft Ir ◽  
Materials Used

The archaeological site of Cercadilla (Cordoba, Spain) includes a complete chronological sequence from the 3rd to 12th centuries. The most relevant monument is a Roman palace dated between the end of the 3rd century and the beginning of the 4th century AD. It is believed that it was the headquarters of the Emperor Maximiano Herculeo. A bathtub with mural paintings has been found in the thermal zone of the palace. Regarding the occupation of the archaeological site in the medieval period, it should be pointed out that two houses with mural paintings were found; these belong to the Caliphal era (10th-11th centuries). During the Caliphal era, the archaeological site was mostly occupied by one of the large suburbs surrounding the walled city. Cercadilla was gradually abandoned; this process starts at the beginning of the 11th century. This study is focused on the analysis of pigments and preparatory layers of red and white mural paintings of the Roman period in the bath zone and on the analysis of pigments in mural paintings in two houses of the Caliphal era. In the thermal zone, the walls have a white mural painting with vertical and horizontal red bands, while the walls in the two Caliphal houses present the red mural painting decorated with white stripes. Techniques such as Optical Microscopy (OM), Scanning Electron Microscopy in combination with Energy Dispersive X-ray Microanalysis (SEM-EDX), X-ray Diffraction (XRD), micro X-ray Diffraction (μ-XRD), Wavelength Dispersive X-ray Fluorescence (WD-XRF), and Fourier Transform-Infrared Spectroscopy (FT-IR) have been used to study the mural paintings of this archaeological site. The results allowed to determine the composition of the materials used and to understand the differences between the technologies employed in Roman and Caliphal remains studied.

Synthesis and Characterization of Hydroxyapatite for Mercury Removal in Polluted Waters

MRS Advances ◽  
2019 ◽  
Vol 4 (64) ◽  
pp. 3569-3577
Author(s):  
Miguel José Álvarez Velásquez ◽  
Valentina Martínez Cortes ◽  
Lina Paola Guarín Alfaro ◽  
Alejandro Figueroa Jaramillo ◽  
Yesmith Santos Panqueva ◽  
...  
Keyword(s):  
Mercury Removal ◽  
Infrared Spectrophotometry ◽  
X Ray Diffraction ◽  
Negative Effects ◽  
X Ray ◽  
The World ◽  
Other Substances ◽  
Main Components ◽  
Polluted Waters

ABSTRACTAccording to the UNEP, mercury pollution is one of the main contamination problems of the world. The UN showed that more than 1,870 tons of this metal are released into the environment annually. This material arrives to water bodies where fish consume it and then reaches humans, producing negative effects on their health. The hydroxyapatite is one of the main components of bones and has proven itself to be useful in the removal of mercury from polluted sources. The aim of this research project is to synthesize and characterize different formulations of this substance and to determine which is the best selective formulation to remove mercury in water. Currently, twenty-one formulations have been produced. The experimental variables examined are the pH, the temperature and the time of calcination. These variables are characterized with Infrared Spectrophotometry (IR), Scanning Electron Microscope (SEM) and X-ray diffraction (XRD). Before calcination the samples contained 70% of hydroxyapatite. This concentration increased in some of them after calcination. The analysis of the results allowed to test the efficiency of these formulations at removing mercury from water. These materials will also be combined, in future stages of the research, with other substances such as activated carbon and organic fibers to improve their performance. The material will be used to coat a filter so that it can become a piping accessory to remove mercury from polluted waters as it is being recirculated.

X-ray Microprobe Studies of Materials Problems Related to Microelectromechanical Systems (MEMS) Structures

1999 ◽  
Vol 605 ◽  
Author(s):  
N. Mölders ◽  
P.J. Schilling ◽  
J. Göttert ◽  
H.O. Moser ◽  
V. Saile
Keyword(s):  
Microelectromechanical Systems ◽  
Mems Devices ◽  
X Ray ◽  
Spatially Resolved ◽  
Fluorescence Measurements ◽  
Transmission Measurements ◽  
Properties Of Materials ◽  
Materials Used ◽  
Micro Systems

AbstractThe understanding of the physical, chemical and mechanical properties of materials used in micro-electromechanical systems (MEMS) is essential for the successful application. For the characterization of such materials, it is often necessary to utilize a probe which can gather information on the same scale as the devices themselves. Based on these needs, x-ray microprobe analysis has been employed to perform spatially resolved measurements on several problems related to the fabrication of MEMS devices. These include spatially resolved transmission measurements of the homogeneity of transmitted flux through a graphite mask, micro-fluorescence measurements to assess elemental distributions, and micro-XANES measurements to follow the breakdown of new sulfone-based x-ray resists. These studies demonstrate the value of such an instrument in the characterization of micro-systems.

Investigation of Creep Behavior of CNT Reinforced Ti6Al4V Under Dynamic Loads

2020 ◽  
Vol 42 (1) ◽  
pp. 70-70
Author(s):  
Ismail Topcu Ismail Topcu ◽  
Burcu Nilg n etiner Burcu Nilg n etiner ◽  
Arif N G ll o lu and zkan G lsoy Arif N G ll o lu and zkan G lsoy
Keyword(s):  
Mechanical Alloying ◽  
Creep Behaviour ◽  
Matrix Alloy ◽  
X Rays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Eds Analysis ◽  
Hardness Tests ◽  
Materials Used

This study investigates the effects of addition of Carbon nanotube (CNT) at different volume ratios (0.5- 5%) into Ti6Al4V matrix by mechanical alloying in terms of the density, microstructure, hardness and creep under dynamic load. As a result of the good bonding of carbon nanotubes powders with the main matrix, Ti-6Al-4V/CNT composites have experienced change both in microstructure and mechanical properties (such as hardness, density) and, correspondingly, qualitatively creep behaviour of Ti-6Al - 4V matrix alloy has been improved compared to the lean one. The density of CNT reinforced Ti6Al4V composites sintered at 1300and#176;C for 3h decreases with increasing CNT content. The hardness tests indicated that the hardness of composites increased with CNT addition. In addition, although creep strain is decreased continually with CNT content until 5%, creep life increased with increasing CNT content until 4% of CNT but decreased above 4%. After sintering at 1300 and#176;C under vacuum for 3 hours the density of the composite material reached to a level of 98.5 %, the microhardness to 538 HV and the creep behaviour was improved. The characterization of Ti6Al4V / CNT composites after mechanical alloying was carried out using scanning electron microscopy (SEM), energy dispersive x-rays spectroscopy (EDS) analysis and X-ray diffraction (XRD) methods. Although Ti–6Al–4V alloys are used as biomaterial, this study aimed at using MWCNTs containing Ti-6Al-4V composites at high temperature applications. Because MWCNTs reinforced Ti-6Al-4V composites are cheaper and have lower weight than the other materials used in this kind of applications.

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