Geopolymers and Ceramics

A special issue of Ceramics (ISSN 2571-6131).

Deadline for manuscript submissions: closed (20 November 2022) | Viewed by 6245

Special Issue Editors


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Guest Editor
Science des Procedes Ceramiques et des Traitements de Surface, Centre Européen de la Céramique, Limoges, France
Interests: ceramics; mineral ressources; cements and concretes

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Guest Editor
Laboratory of Applied Inorganic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé P.O. Box 812, Cameroon
Interests: ceramics; cements; porous material; microstrcuture; mechanical properties; refractory products; membrane ceramic; sintering

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Guest Editor
IRCER, UMR CNRS 7315, ENSIL-ENSCI, Université de Limoges, 87065 Limoges, France
Interests: ceramics; phyllosilicates; formulation and shaping; sintering; textured materials; structural transforations
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Special Issue Information

Dear Colleagues,

The present Special Issue is focused on topics regarding new trends and current developments for “geopolymers and ceramics”. Indeed, the environmental issues and the increase in the demography on earth tend to enhance the optimization of material processing. Silicate ceramic formulation, shaping processes, structural transformations, and sintering-property correlations will be the main focus of this Special Issue. Additionally, novel or improved consolidation routes using raw silicate materials in the field of geomaterials are encouraged. It will reflect the advances and applications in the field of silicate materials as wide-diffusion or technical ceramics. The type of silicate raw materials includes natural and synthetic powders. Researchers are invited to contribute through review articles or original research papers.

Prof. Dr. Philippe Blanchart
Dr. Cyriaque Rodrigue Kaze
Dr. Gisèle Lecomte-Nana
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Ceramics is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ceramics
  • geomaterials
  • processing
  • microstructure
  • enviromental impact
  • sintering
  • phase interaction
  • properties

Published Papers (3 papers)

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Research

17 pages, 4781 KiB  
Article
A Study of the Wear Mechanism of Composites Modified with Silicate Filler
by Sakhayana N. Danilova, Sofia B. Yarusova, Nadezhda N. Lazareva, Igor Yu. Buravlev, Oleg O. Shichalin, Evgeniy K. Papynov, Ivan G. Zhevtun, Pavel S. Gordienko and Aitalina A. Okhlopkova
Ceramics 2022, 5(4), 731-747; https://doi.org/10.3390/ceramics5040053 - 13 Oct 2022
Cited by 3 | Viewed by 1596
Abstract
The article considers the effect of a filler based on synthetic wollastonite (CaSiO3), which is introduced into a polymer matrix made of ultra-high molecular weight polyethylene, on the tribotechnical parameters of the produced polymer composite material. Behavioral features of composites after [...] Read more.
The article considers the effect of a filler based on synthetic wollastonite (CaSiO3), which is introduced into a polymer matrix made of ultra-high molecular weight polyethylene, on the tribotechnical parameters of the produced polymer composite material. Behavioral features of composites after friction were investigated by infrared spectroscopy and scanning electron microscopy. It was found that the introduction of wollastonite into the polymer matrix contributed to a reduction in the friction coefficient by 23% and the wear rate by four times. In the micrographs of the friction surfaces of the obtained composite, the formation of new secondary structures oriented along the friction direction, different from the initial polymer matrix, was revealed. The presence of wear products (oxidized polymer groups) and CaSiO3 on the friction surfaces was recorded by infrared spectroscopy. It was established that the synthesized CaSiO3 particles were deformed under the action of shear forces and participated in tribochemical processes. Full article
(This article belongs to the Special Issue Geopolymers and Ceramics)
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12 pages, 1698 KiB  
Article
Kinetics of the Synthesis of Aluminum Boride by the Self-Propagating High-Temperature Synthesis Method
by Sestager Khusainovich Aknazarov, Alibek Zhumabekovich Mutushev, Juan Maria Gonzalez-Leal, Olga Stepanovna Bairakova, Olga Yuryevna Golovchenko, Natalia Yuryevna Golovchenko and Elena Alexandrovna Ponomareva
Ceramics 2022, 5(3), 435-446; https://doi.org/10.3390/ceramics5030033 - 15 Aug 2022
Cited by 4 | Viewed by 1612
Abstract
The influence of certain factors on the kinetics of the process of obtaining aluminum borides (burning rate, ingot formation, and phase separation) was investigated. In this study, we report the registration of diboride using the SHS protocol. The synthesis of aluminum diboride from [...] Read more.
The influence of certain factors on the kinetics of the process of obtaining aluminum borides (burning rate, ingot formation, and phase separation) was investigated. In this study, we report the registration of diboride using the SHS protocol. The synthesis of aluminum diboride from boric anhydride occurred by the aluminothermic method. The initial components were boron trioxide and aluminum in the form of powders. Researchers paid special attention to the degree of grinding of the charge fluxing substances. The influence this had on the rate of development of the degree of charge concentration was studied. To calculate the degree of charge, a composition was chosen according to the speed obtained from a number of experiments where melting was carried out with the following charge densities in g/cm3: 0.80; 1.08; 1.18; 1.74. The method of melting was ignition from above. The experimental results allowed us to conclude that the nature of the change in the combustion rate of the system, where there was an excess of the reducing agent in the charge, is the same. An increase in the combustion rate, where there was an excess of aluminum of up to 20%, was likely due to the fact that the reaction area of the charge components increased. In addition, an increase in speed can be explained by a decrease in heat losses due to a reduction in the melting time. With an increase in excess aluminum above 20% of the stoichiometry, the observed decrease in the combustion rate can be explained by a decrease in the specific heat of the process due to the melting of the excess aluminum, which played the role of a ballast. Full article
(This article belongs to the Special Issue Geopolymers and Ceramics)
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17 pages, 4352 KiB  
Article
Calcium Silicate Hydrate Cation-Exchanger from Paper Recycling Ash and Waste Container Glass
by Andrew P. Hurt, Aimee A. Coleman, Haosen Ma, Qiu Li and Nichola J. Coleman
Ceramics 2022, 5(3), 301-317; https://doi.org/10.3390/ceramics5030024 - 22 Jul 2022
Cited by 1 | Viewed by 2358
Abstract
Synthetic 11 Å tobermorite (Ca5Si6O16(OH)2.4H2O) and its Al-substituted analogue are layer-lattice ion-exchangers with potential applications in nuclear and hazardous wastewater treatment. The present study reports the facile one-pot hydrothermal synthesis of an Al-tobermorite-rich [...] Read more.
Synthetic 11 Å tobermorite (Ca5Si6O16(OH)2.4H2O) and its Al-substituted analogue are layer-lattice ion-exchangers with potential applications in nuclear and hazardous wastewater treatment. The present study reports the facile one-pot hydrothermal synthesis of an Al-tobermorite-rich cation-exchanger from a combination of paper recycling ash, post-consumer container glass, and lime, with compositional ratios of [Ca]/[Si + Al] = 0.81 and [Al]/[Si + Al] = 0.18. The reaction products were characterized by powder X-ray diffraction analysis, 29Si magic angle spinning nuclear magnetic resonance spectroscopy, and scanning electron microscopy. Hydrothermal processing in 4 M NaOH(aq) at 100 °C for 7 days yielded an Al-tobermorite-rich product that also contained katoite (Ca3Al2SiO12H8), portlandite (Ca(OH)2), calcite (CaCO3), and amorphous silicate gel. The hydrothermal product was found to have a Cs+ cation exchange capacity of 59 ± 4 meq 100 g−1 and selective Cs+ distribution coefficients (Kd) of 574 ± 13 and 658 ± 34 cm3 g−1 from solutions with molar ratios [Cs+]:[Na+] and [Cs+]:[Ca2+] of 1:100. In a batch sorption study at 20 °C, the uptakes of Pb2+, Cd2+, and Cs+ were determined to be 1.78 ± 0.04, 0.65 ± 0.06, and 0.36 ± 0.03 mmol g−1, respectively. The kinetics of Pb2+, Cd2+, and Cs+ removal were described by the pseudo-second-order rate model, which gave respective rate constants (k2) of 0.010, 0.027, and 1.635 g mmol−1 min−1, and corresponding correlation coefficients (R2) of 0.997, 0.996, and 0.999. The metal ion sorption properties of the tobermorite-rich product compared favorably with those of other waste-derived tobermorites reported in the literature. Potential strategies to improve the yield, crystallinity, and sorption characteristics of the product are discussed. Full article
(This article belongs to the Special Issue Geopolymers and Ceramics)
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