Thermal behavior (TG-DTA-TMA), sintering and properties of a kaolinitic clay from Buenos Aires Province, Argentina

Conconi, María Susana; Morosi, Martín Eduardo; Maggi, Jorge; Zalba, Patricia Eugenia; Cravero, Fiorella; Rendtorff, Nicolás M.

doi:10.1590/0366-69132019653742621

Cited by 22 publications

(15 citation statements)

References 35 publications

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“…The thermal behavior of the modified ogwuta clay as presented in Fig. 3 showed thermal behavior similar to most kaolinitic clay samples in literature [29,30]. The clay showed initial exothermic weight gain that peaked at 39.84 o C. This might be attributed to hygroscopic behavior of the samples enhanced by not using very dried air [31].…”

Section: Thermal Analysissupporting

confidence: 59%

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Physicochemical Properties of Organophilic Clay Developed Using Hexadecyltrimethylammonium Chloride (HDTMAC) Modifier

Inya

Uzoamaka

Obi

2021

IRJPAC

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Aims: Ogwuta clay from Unwana in the South Eastern part of Nigeria was modified by ion exchange reaction using hexadecyltrimethylammonium chloride (HDTMAC). Study Design: This study was analyzed experimentally and instrumentally. Place and Duration of Study: This study was carried out at the Department of Pure and Industrial Chemistry, Faculty of Science, University of Port Harcourt, Nigeria. The sample collection, literature search, experiment, results and analysis lasted for one and half years. Methodology: Physicochemical and thermal properties of the clay were determined after modification using classical and spectroscopic techniques. A combination of the wet and dry method (X-ray Fluorescence) was used to determine the metal oxide composition. Other techniques included; Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and Thermogravimetry (TG). The Cation Exchange Capacity (CEC) was determined using the methylene blue method with a value of 16.4 meq/100g after modification. Results: The product was slightly acidic with pH 4.3. Silica (SiO2), alumina (Al2O3), Na+, and K+ were found to be 47.58 %, 18.99%, 2.27, and 0.23% respectively. The clay was limited in mineral impurities with 0.0% T4+, 0.41% Mg2+, and 0.11% Ca2+ but high in carbonaceous matter with loss on ignition (LOI) of 13.17%. A C-H asymmetric stretching was visible around the 2931.9 cm-1 region as revealed by the Fourier Transform Infra-Red analysis. The X-Ray Diffraction analysis of the modified clay showed a basal spacing of 8.121 Å. Also, the X-Ray Diffractogram revealed kaolinite as the major clay mineral with the presence of quartz and polygorskite. Conclusion: This study posits that the modified clay can be potentially suitable for the adsorptive removal of organic contaminants in aqueous and real life media.

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Section: Thermal Analysissupporting

confidence: 59%

“…However, all gained weight was lost completely at 45. [30] was due to the dehydroxylation of the hydroxyl group of the clay sample.…”

Section: Thermal Analysismentioning

confidence: 99%

Physicochemical Properties of Organophilic Clay Developed Using Hexadecyltrimethylammonium Chloride (HDTMAC) Modifier

Inya

Uzoamaka

Obi

2021

IRJPAC

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“…The dehydroxilation of clay occurred from 411-546 °C. Small mass loss due to the dehydroxylation of clay is associated with red clay small reactivity compared to kaolin clay, where mass loss may reach 8.5 % [23], [24]. A small endothermic peak starting at around 573 °C was associated with the allotropic transformation of quartz which also corresponds with the data from the XRD and literature [25].…”

Section: Description Of Precursorssupporting

confidence: 56%

Mechanical Properties of Alkali Activated Material Based on Red Clay and Silica Gel Precursor

Būmanis

Vaičiukynienė

2021

Environmental and Climate Technologies

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The search for alternative alumosilicates source for production of alkali activated materials (AAM) is intensively researched. Wide spread of natural materials such as clays and waste materials are one of potential alternatives. In this research AAM was made from local waste brick made of red clay and calcined low-carbonate illite clay precursor and its properties evaluated. Waste silica gel containing amorphous silica from fertilizer production plant was proposed as additional raw material. 6 M and 7 M NaOH alkali activation solutions were used to obtain AAM. Raw materials were characterized by X-ray diffraction, laser particle size analyser, DTA/TG. Raw illite clay was calcined at a temperature of 700 to 800 °C. Waste brick was ground similar as raw clay and powder was obtained. Replacement of red clay with silica gel from 2–50 wt.% in mixture composition was evaluated. Results indicate that the most effective activator was 6 M NaOH solution and AAM with strength up to 13 MPa was obtained. Ground brick had the highest strength results and compressive strength of AAM reached 25 MPa. Silica gel in small quantities had little effect of AAM strength while significant strength reduction was observed with the increase silica gel content. The efflorescence was observed for samples with silica gel.

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“…Knowing from Carty and Senapati [34], the weight loss of pure kaolinite was approximately 14%, and we had deduced an initial kaolinite proportion of about 50% in the initial porcelain formulation. Moreover, the exothermic peak around 1000 °C was typically associated with spinel aluminosilicate and primarily the mullite phase formation [34,35].…”

Section: Tg-dsc Of the Powdermentioning

confidence: 99%

3D printing of porcelain and finite element simulation of sintering affected by final stage pore gas pressure

Manière

Harnois

2021

Materials Today Communications

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Ceramic 3D printing involves various sintering phenomena such as shape distortions, crack formations, shrinkage anisotropy, and residual porosity that demands the development of a simulation tool. Moreover, liquid-phase sintering of materials such as porcelain exhibits an additional and challenging phenomenon at the end of the sintering process that reflects closed porosity growth and coalescence owing to the pressure created by the pore-trapped gases, which further implies swelling (or bloating) of the entire specimen accompanied by distortions. In this study, the swelling issue of 3D-printed porcelain samples was investigated through a sintering dilatometry parametric design to determine the optimal heating rate and holding temperature. A sintering modeling theory was employed to characterize the final stage pore gas pressure via an inverted sintering model formulation. Finally, a finite element sintering simulation was applied based on the analytical model data to predict the sintering shrinkage of a complex geometry.

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Thermal behavior (TG-DTA-TMA), sintering and properties of a kaolinitic clay from Buenos Aires Province, Argentina

Cited by 22 publications

References 35 publications

Physicochemical Properties of Organophilic Clay Developed Using Hexadecyltrimethylammonium Chloride (HDTMAC) Modifier

Physicochemical Properties of Organophilic Clay Developed Using Hexadecyltrimethylammonium Chloride (HDTMAC) Modifier

Mechanical Properties of Alkali Activated Material Based on Red Clay and Silica Gel Precursor

3D printing of porcelain and finite element simulation of sintering affected by final stage pore gas pressure

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