Characterization of Calcium Carbonate Produced by
Calcium sources are a tremendous role in microbial cement formation process It is known that calcium chloride from calcium sources increases the urease activity and produces more calcium carbonate Achal and Pan 2014 In present study the maximum amount of calcium carbonate was recorded in the medium containing 1000 mM CaCl 2 at the
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Study of thermal effects observed by differential thermal
This article is cited by 60 publications L F Whiting and P W Carr Effect of thermal lag and measurement precision in differential scanning calorimetry theoretical guidelines for enzyme substrate reactions by the method of orthogonal collocation
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Characterization of the Calcium Fluoroaluminosilicate
analysis TG/DTA/DSC photoluminescence PL nuclear magnetic resonance NMR27Al 29Si and X ray diffraction XRD 2 Experimental The nonhydrolytic sol gel route described in the literature19 and modified by Ciuffi20 was employed in the preparation of the calcium fluoroaluminosilicate glass The glasses were prepared in oven dried glassware
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Low temperature synthesis of calcium cobaltites in a solid
The DTA/TG data of the relevant mixture of calcium carbonate and cobalt oxide are presented in Fig 1 The main endothermic reaction accompanied by mass losses was attributed to the decomposition of CaCO 3 to CaO and to the simultaneous formation of Ca 3 Co 4 O 9 calcium cobaltite Formation of that phase occurred between 795–812 °C and was preceded by other reaction in the
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Formation of calcium aluminates in the lime sinter process
26 2 mg DTA range = 25 yV 91 DTA and TG curves for the ternary mixture of CaCOg AI2O3 and Si02 gel Heating rate = 10°C/min sample weight = 34 5 mg DTA range = 25 yV 92 Formation of CA and C3A at 1200OC The C5A3 phase also formed at this temperature 101 Formation of aluminates at 1250°C 102 Formation of aluminates at 1300°C 103
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Characterization of calcium deposition induced by
In this study the features of calcium carbonate deposition were investigated Inoculated BG11 in different calcium ion concentrations 2 5 Deposit analysis by TG DTA and DSC TG DTA analysis and DSC measurements were carried out using a
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TG DTA AND DSC INVESTIGATIONS OF PINHÃO BY
TG DTA AND DSC INVESTIGATIONS OF PINHÃO STARCH MODIFIED BY CALCIUM HYPOCHLORITE AND UV LIGHT 1Polyanna Silveira Hornung 1Simone Rosa da Silveira Lazzarotto 2Marcelo Lazzarotto 1Egon Schnitzler polyanna14silveira gmail ¹Universidade Estadual de Ponta Grossa Av Carlos Cavalcanti 4748CEP 84 Ponta GrossaPR
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Preparation and characterization of calcium cobaltite for
DTA/TG study were applied to all the batches in flowing air at temperature range °C calcium cobaltite formation is the most influenced by cobalt oxide source and starting cation ratio Cobalt oxide 2 exhibits lower temperature of the new compound formation in
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Thermal analysisTGA DTA
Thermal analysis Thermo Gravimetric Analysis TGA Differential Thermal Analysis DTA Mr C Naresh Babu Assistant Professor Email nareshbabu cvn gmail 2 Thermal Analysis Thermal analysis is a branch of materials science where the properties of materials are studied as they change with temperature
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Study by DTA TG of the formation of calcium
StudybyDTA/TGoftheformationofcalciumaluminateobtainedfromanaluminiumhazardouswasteA Lo´pez Delgado F A Lo´pez L Gonzalo Delgado S Lo´pez Andre´s F J
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Calcium ferrite formation from the thermolysis of calcium
For preparing calcium ferrite calcium tris maleato ferrate III precursor was prepared by mixing aqueous solutions of iron III maleate calcium maleate and maleic acid Various physico chemical techniques i e TG DTG DTA Möss XRD IR etc have been used to study the decomposition behaviour from ambi ent to 900°C and ferrite formation
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Thermogravimetric and spectroscopic study TG–DTA/FT–IR
TG–DTA of the activated carbons For the AC samples TGA–DTA thermal analysis obtained in oxidizing atmosphere of dry air was used to study the thermal stability of the materials after the activation process in order to provide information on the adsorbed water and ash contents from the ACs produced with different activating agent ratios
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CORE
Study by DTA/TG of the formation of calcium aluminate obtainedud from an aluminium hazardous waste By Aurora López Delgado F A López Gómez Laura
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Introduction to TG/DTA/DSCLouisiana Tech University
Introduction to TG/DTA/DSC Outline Introduction Theory of TG/DTA/DSC Application of TG Study thermal degradation Chemical reaction resulting in changes of mass such as absorption adsorption desorption Determine heat of formation Sample purity Summary Measure heat flow difference between reference and sample
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Study by DTA/TG of the formation of calcium CORE
An amorphous precursor wasud obtained by a hydrothermal method at different values ofud pH The transformation of the precursor in a crystallineud aluminate was followed by TG/DTA up to 1300 ºC Atud temperatures between 719 and 744 ºC the precursorsud evolve towards the formation of C12A7 which becomes CAud at circa 1016 ºC
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Thermal analysisSlideShare
NH3 > RNH2 > R2NH > R3N 7 DTA is useful in the study of organic reaction The rate and the nature of the organic reaction can be studied by DTA Example Malonic acid on heating about 70°C it undergoes phase transition and at 150°C it undergoes decarboxylation to acetic acid
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Transformation of amorphous calcium carbonate into
Transformation of amorphous calcium carbonate into monohydrocalcite in aqueous solution a biomimetic mineralization study TG DTA 13 C NMR and ICP AES Our results show that PASP Mg ACC with 24 71 mol Mg 2 can be transformed into MHC without formation of hydromagnesite or other hydrated magnesium carbonates
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PDF Preparation and characterization of calcium
Oxide 2 contains small amount of cobalt sition of the cobalt oxides was tested by DTA/TG study in air hydroxide or hydrate as confirmed by DTG and IR study during heating and cooling Co2 content was determined af However the reason of lower decomposition temperature is
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Several different TA methods exist focus on TGADTA Combining the two techniques TGA DTA comprehensive study of a materials thermal behaviour While TG only measures changes caused by mass loss DTA also register changes in material where no mass loss occur e g crystal structure changes melting glass transistion etc
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In this paper the effect on thermal behavior and compounds mineralogy of replacing different percentages of fly ash with compact particles was studied A total of 30 of fly ash was replaced with mass powder glass PG 70 with mass natural aggregates S and 85 with mass PG and S According to this study the obtained fly ash based geopolymer exhibits a 20 mass loss in the
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In vitro Growth and Inhibition Studies of Tribulus
Calcium Oxalate Monohydrate crystal The COM crystal as shown in fig 2 The harvested crystals are characterized by FTIR XRD and TG DTA techniques 2 2 Herbal Extract Preparation The dried and matured seeds of Tribulus terrestris were collected from Botanical garden Department of Botany Annamalai University
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Study by DTA/TG of the formation of calcium aluminate
The transformation of the precursor in a crystalline aluminate was followed by TG/DTA up to 1300 ºC At temperatures between 719 and 744 ºC the precursors evolve towards the formation of C12A7 which becomes CA at circa 1016 ºC
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STUDY BY DTA/TG OF THE FORMATION OF CALCIUM
The aim of this work was to study by means of TG/DTA the formation of monocalcium aluminate CA by using a hazardous waste as Al bearing product and CaO A low temperature hydrothermal method was employed to obtain the precursor phase Experimental Materials A sample of Aluminium Hazardous Waste AHW supplied by a tertiary aluminium industry
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Study by DTA/TG of the formation of calcium aluminate
thesis of calcium aluminate An amorphous precursor was obtained by a hydrothermal method at different values of pH The transformation of the precursor in a crystalline aluminate was followed by TG/DTA up to 1300 C At temperatures between 719 and 744 C the precursors evolve towards the formation of C 12A 7 which becomes CA
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Study on the synthesis of spherulitic calcium carbonate
Spherulitic calcium carbonate composite is synthesized in the solution of amphiphilic block copolymer PS b PAA FE SEM and XRD measurements show that the size of the particulates decrease with the augment of PS b PAA concentration and the morphology as well as the crystalline structure are changed too TG DTA together with IR analysis is applied to investigate the thermal dynamic behavior of
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A study of the decomposition of calcium propionate using
In this study the decomposition of calcium propionate was examined using simultaneous TG DTA with a rising temperature program and heating in dry nitrogen and air The material initially decomposed to CaCO 3 and then to CaO with further heating The process was endothermic in nitrogen but exothermic in air
Get PriceAPPLICATION OF THERMAL METHODS IN THE
An endothermic peak about 420 oC on the DTA curve as well as mass loss in the temperature range oC on the TG curve are attributed to the decomposition process of Ca OH 2 The sample mass loss is converted into the degree of conversion α according to Eq 1 The series of the TG T curves together with the α
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Thermal analysisTGA DTA
Thermal analysis Thermo Gravimetric Analysis TGA Differential Thermal Analysis DTA Mr C Naresh Babu Assistant Professor Email nareshbabu cvn gmail 2 Thermal Analysis Thermal analysis is a branch of materials science where the properties of materials are studied as they change with temperature
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TG and DTA curves of cements after soaking them for 28 days in distilled water The different samples are denoted as IProRooth IIAngelus gray IIIAngelus white IVBio Aggregate VBiodentine Y Kouzmanova et al Comparative study of the phase formation and interaction with water of calcium silicate cements
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DIGITAL CSIC Study by DTA/TG of the formation of calcium
The transformation of the precursor in a crystalline aluminate was followed by TG/DTA up to 1300 C At temperatures between 719 and 744 C the precursors evolve towards the formation of C12A7 which becomes CA at circa 1016 C Mass spectrometry coupled to thermal analyser allowed the identification of the decomposition products
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One Step Synthesis of Calcium Sulfate Hemihydrate
The results indicate that mixing calcite with dilute sulfuric acid in methanol and storing the resulting mixture at 20 °C and 1 atm without stirring generates nanofibers consisting of both the bassanite and calcite phases As indicated by the TG/DTA curves shown in Figure S3 the estimated bassanite content in M′ 425 was about 64 mass
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Production of Synthetic Phosphoanhydrite and Its Use as a
The study was designed in two stages Initially a phosphoanhydrite PA was produced by heating phosphogypsum at temperatures of 350 °C 450 °C 550 °C and 650 °C Two periods of heating were applied 2 and 4 h The formation of anhydrite was determined by thermogravimetric analysis DTA TG and confirmed by X ray diffraction XRD
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Preparation and characterization of calcium cobaltite for
The results of DTA/TG study are consistent with the CaO CoO system 6 however temperatures of the relevant reactions are higher which is obvious in the case of dynamic studies The source of cobalt oxide influences only formation of Ca349 phase the reaction happens at lower temperature Δ T = 56 °C if oxide 2 was applied
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Neutron Thermodiffractometry Study of Calcium Zirconate
Neutron Thermodiffractometry Study of Calcium Zirconate/Magnesium Oxide Formation in the ZrO 2 –CaO–MgO System DTA TG also was used The the evolution of the crystalline phases the mechanism and temperature of formation of CaZrO 3 and the activation energy were properly established in terms of the neutron thermodiffraction study
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Preparation and characterization of calcium cobaltite for
Summary results of DTA/TG study of 1 1 and 3 4 compositions are shown in Table 2 and on Fig 2 Four endothermic reactions are found for each composition but only three first reactions are solid phase reactions and the last one must be related to liquid formation the last reaction is not shown on Fig 2 could be seen that the first reaction I of calcium carbonate decomposition and
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Influence of CaO Source on the Formation Behavior of
The objective of this study is to investigate the influence of CaO source on the formation of Calcium ferrites by solid state reaction <1200°C Two sources of CaO existing in the form of Ca OH 2 and CaCO 3 are compared in regard to the thermal change and variation of density of samples
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