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165 results on '"Lauermannová, Anna-Marie"'

28. MOC-based composites with 1D and 2D carbon nanomaterials stabilized by tannic acid.

Author

Lauermannová, Anna-Marie, Slámová, Julie, Jankovský, Ondřej, Pavlík, Zbyšek, Záleská, Martina, and Pivák, Adam

Subjects
*TANNINS, *MULTIWALLED carbon nanotubes, *NANOSTRUCTURED materials, *NANOPARTICLES
Abstract

The presented study is focused on a novel approach in the design of composites based on magnesium oxychloride cement (MOC) material as alternative to construction materials widely used in building industry. The base of this approach lies in the enhancement of the MOC-matrix using tannic acid and carbon-based nanomaterials, namely graphene nanoplatelets and multi-walled carbon nanotubes. The use of the carbon nanomaterials in very low content is beneficial for the mechanical and macrostructural parameters of the composite, whereas the tannic acid was added for its possible ability to improve not only mechanical performance, but also the water resistance of the composite. A reference MOC sample, MOC with tannic acid sample and MOC with tannic acid and combination of graphene nanoplatelets and multi-walled carbon nanotubes were prepared and studied. All of the additives proved themselves beneficial for the matrix, resulting in a formation of composite applicable e.g., in construction industry. [ABSTRACT FROM AUTHOR]

Published
2024
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40. MOC-Graphene composites for lunar constructions

Author

Lauermannová, Anna-Marie, primary, Sedmidubský, David, additional, Faltysová, Ivana, additional, Pavlík, Zbyšek, additional, Pavlíková, Milena, additional, Záleská, Martina, additional, and Jankovský, Ondřej, additional

Published
2022
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42. Graphene- and Graphite Oxide-Reinforced Magnesium Oxychloride Cement Composites for the Construction Use

Author

Lauermannová, Anna-Marie, Lojka, Michal, Pavlíková, Milena, Pivák, Adam, Záleská, Martina, Pavlík, Zbyšek, Zmeškal, Oldřich, and Jankovský, Ondřej

Subjects
Materials science, General Chemical Engineering, water, chemistry.chemical_element, Graphite oxide, reduction, Analytical Chemistry, law.invention, chemistry.chemical_compound, silica Fume, law, Materials Chemistry, Physical and Theoretical Chemistry, Composite material, phase, Composites, doped Graphene, Graphene, Magnesium, Cement composites, Magnesium oxychlorides, chemistry, Multiwalled Carbon Nanotubes, adsorption, Ceramics and Composites, metal-Ionsmechanical-Properties, hydration
Abstract

Graphene and graphite oxide reinforced magnesium oxychloride cement (MOC) pastes were researched. To produce MOC pastes, the light-burnt magnesium oxide was added and dispersed in the magnesium chloride solution. The graphene powder, graphite oxide powder, and their combination were incorporated in the solution. The total amount of the nano additives was 0.5 % by the weight of the magnesium oxychloride binder. The morphology and microstructure of the hardened materials were studied using scanning electron microscopy (SEM). The phase composition of precipitated MOC-based products was investigated using X ray diffraction (XRD). The macrostructural parameters of the composites such as bulk density, specific density, and open porosity were evaluated. Mechanical strength and stiffness were analyzed by the measurement of flexural and compressive strength and dynamic elastic modulus. The electrical properties were examined by the use of impedance spectroscopy (IS). From the experimental results the model of the transport of electric charge in researched materials dispersion was estimated. The use of graphene- and graphite oxide-reinforcement of MOC matrix gave highly dense materials of low porosity, high mechanical resistance, whereas the used nano-additives enabled the produce of composites of high strength efficiency index. The addition of graphene particles and the formation of graphite agglomerates significantly decreased electrical resistivity of the MOC matrix which was originally characterized by low electrical conductivity.

Published
2021

49. Hydrotalcites in Construction Materials

Author

Lauermannová, Anna-Marie, primary, Paterová, Iva, additional, Patera, Jan, additional, Skrbek, Kryštof, additional, Jankovský, Ondřej, additional, and Bartůněk, Vilém, additional

Published
2020
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