Zobrazeno 1 - 10
of 130
pro vyhledávání: '"Vlastimil Matějka"'
Autor:
Hana Ovčačíková, Jeffrey Stephen Miller, Vlastimil Matějka, Eva Bartoníčková, Ondřej Jankovský, Jozef Vlček
Publikováno v:
Open Ceramics, Vol 20, Iss , Pp 100664- (2024)
In “London Underground” stations, a high concentration of dust particles containing organic and inorganic matter of varying chemical composition. “London underground dust” is created from train wheels and brakes grinding against steel tracks
Externí odkaz:
https://doaj.org/article/8752b644b99b460da03aa55b3fb5cb6f
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-10 (2023)
Abstract Keeping recycling and the circular economy in mind, this study explores the reduction in emission of a highly optimized, commercially employed friction material formulation through the addition of metallurgical slags from a basic oxygen furn
Externí odkaz:
https://doaj.org/article/6cf02b4d8ec942938fb8e5f0aedff2cf
Autor:
Vlastimil Matějka, Radim Škuta, Kryštof Foniok, Vlastimil Novák, Daniel Cvejn, Alexandr Martaus, Monika Michalska, Jiří Pavlovský, Petr Praus
Publikováno v:
Journal of Materials Research and Technology, Vol 18, Iss , Pp 3319-3335 (2022)
This work describes the doping of graphitic carbon nitride (g-C3N4) with phosphorus performed by 2-h heat treatment of a mechanical mixture of g-C3N4 precursor (urea, dicyandiamide, and guanidine hydrochloride) with hexachlorocyclotriphosphazene at 5
Externí odkaz:
https://doaj.org/article/9938aa204fb748b1894da366eb8a37e2
Publikováno v:
Nanoscale Research Letters, Vol 16, Iss 1, Pp 1-14 (2021)
Abstract Graphitic carbon nitride (CN) synthetized by the thermal polycondensation of melamine at 550 °C for 4 h was further exfoliated by heating at 500 °C for 3 h. Silver cations were adsorbed on the exfoliated graphitic carbon nitride (CNE) and
Externí odkaz:
https://doaj.org/article/8763cb97f3cc4d43afe3f1659b88ff3b
Autor:
Vlastimil Matějka, Priyadarshini Jayashree, Mara Leonardi, Jozef Vlček, Tomáš Sabovčík, Giovanni Straffelini
Publikováno v:
Lubricants, Vol 10, Iss 9, p 219 (2022)
The aim of our research was to indicate the suitability of metallurgical slags (two blast furnace slags and one steel furnace slag) as the components of Cu-free friction materials. The base mixture consisted of nine components including phenolic resi
Externí odkaz:
https://doaj.org/article/a0b1bbffc06c4396886f8c24cab4e111
Publikováno v:
Lubricants, Vol 10, Iss 2, p 27 (2022)
This study compares the effect of the addition of two types of lubricants on the dry sliding behavior of a simplified Cu-free phenolic resin-based composite material. The lubricants were commercial graphite and exfoliated graphitic carbon nitride (co
Externí odkaz:
https://doaj.org/article/f191503363a442deb594ffd69594698f
Publikováno v:
Metals, Vol 12, Iss 1, p 123 (2022)
In this study, graphitic carbon nitride (g-C3N4, labelled as gCN) was tested in the formulation of copper-free (Cu-free) friction mixtures, which are potentially interesting for brake pad manufacturing. Three formulations of friction composites were
Externí odkaz:
https://doaj.org/article/c389566d0b3d449e946406b9f480143e
Publikováno v:
Journal of Sustainable Metallurgy. 8:511-521
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::beea254ce5294514a9f44c82226512cc
https://doi.org/10.1007/s40831-022-00513-z
https://doi.org/10.1007/s40831-022-00513-z
Publikováno v:
Nanomaterials, Vol 10, Iss 9, p 1747 (2020)
Graphitic carbon nitride (GCN) was synthetized by heating melamine and then it was thermally exfoliated for 1–3 h in air. Both bulk and exfoliated GCN nanomaterials were treated in the 10–30% aqueous solutions of H2O2 for us to study their modifi
Externí odkaz:
https://doaj.org/article/1c41452061c54f6aa6287f7c499c6ea3
Autor:
JOZEF VLČEK, LUCIE DRONGOVÁ, MICHAELA TOPINKOVÁ, VLASTIMIL MATĚJKA, JANA KUKUTSCHOVÁ, MARTIN VAVRO, VÁCLAVA TOMKOVÁ
Publikováno v:
Ceramics-Silikáty, Vol 58, Iss 1, Pp 79-88 (2014)
The prepared alkali-activated binders (AAB) and composites using suitable latent hydraulic raw materials represent an alternative to materials based on Portland cements. This paper deals with ways how to influence the functional parameters of AAB by
Externí odkaz:
https://doaj.org/article/66976a2bd28b4c2ea93e245ee73b1298