Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Vlastimil Matĕjka"'
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:
Amrita Jain, Sai Rashmi Manippady, Rui Tang, Hirotomo Nishihara, Kamil Sobczak, Vlastimil Matejka, Monika Michalska
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-12 (2022)
Abstract The electrochemical properties of metal oxides are very attractive and fascinating in general, making them a potential candidate for supercapacitor application. Vanadium oxide is of particular interest because it possesses a variety of valen
Externí odkaz:
https://doaj.org/article/6622b59faa85471c9884e1d1929c8c02
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:
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
Autor:
Jozef Vlček, Michaela Topinková, Miroslava Klárová, Petra Maierová, Hana Ovčačíková, Vlastimil Matějka, Alexandr Martaus, Veronika Blahůšková
Publikováno v:
Minerals, Vol 11, Iss 2, p 197 (2021)
Metakaolin (MK) prepared by the calcination of kaolin at 550 °C and fly ash (FA) from the combustion of black coal in a granulating boiler were used to prepare unfired ceramic bonding systems via the alkali activation process. A long-term stability
Externí odkaz:
https://doaj.org/article/ab46e3093d72467c84c498f99d67afef
The Effect of Temperature and Milling Process on Steel Scale Utilized as a Pigment for Ceramic Glaze
Publikováno v:
Materials, Vol 13, Iss 8, p 1814 (2020)
This study is focused on the evaluation of the re-utilizability of scale originated during the steel casting and steel rolling processes as a pigment for glazes. Non-oiled scale with Fe3O4 as the major phase were used as a coloring component of trans
Externí odkaz:
https://doaj.org/article/e8ef5b8f28a342e3b760b5a5bc32622c
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
Publikováno v:
Atmosphere, Vol 10, Iss 5, p 263 (2019)
Brake-related airborne particulate matter contributes to urban emissions in the transport sector. Recent research demonstrated a clear dependence of the number of ultra-fine particles on the disc brake temperature. Above the so-called transition temp
Externí odkaz:
https://doaj.org/article/eacb5dc9e2704f6db9193249d388334b