Mateusz Szala

Military University of Technology in Warsaw

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S. Cudziło

Military University of Technology in Warsaw

W. A. Trzciński

Military University of Technology in Warsaw

Andrzej Borkowski

Jagiellonian University

Rafał Lewczuk

Institute of Industrial Organic Chemistry

A. Huczko

University of Warsaw

L. Szymańczyk

Military University of Technology in Warsaw

M. Bystrzejewski

University of Warsaw

Józef Paszula

Military University of Technology in Warsaw

Magdalena Urbańska

Military University of Technology in Warsaw

Z. Chyłek

Military University of Technology in Warsaw

Cooperative Institutions

Military University of Technology in Warsaw

Instytut Chemii i Techniki Jądrowej

Warsaw University of Technology

University of Warsaw

Polish Academy of Sciences

Gdańsk University of Technology

University of Gdańsk

Institute of Physics

AGH University of Krakow

University of Silesia in Katowice

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Studies of Confined Explosions of Composite Explosives and Layered Charges

Central European Journal of Energetic Materials (2016)

Lotfi Maiz W. A. Trzciński Mateusz Szala Józef Paszula Krzysztof Karczewski

10.22211/cejem/65075

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Citations (16)

New energetic materials derived from common explosives. Review

Materiały Wysokoenergetyczne / High Energy Materials (2020)

Mateusz Szala Tomasz Sałaciński

The review discusses the products of 2,4,6-trinitrotoluene reactions which have explosive properties or are potentially high-energy compounds. The following compounds are discussed: trinitrobenzene, cyanotrinitrobenzene, trinitroxylene, aminotrinitrotoluenes, trinitronitromethylbenzene, methylene bis(2,4,6-trinitrobenzene), hexanitrostilbene, nitromethyldiphenylamines, 4,4’,6,6’-tetranitro-2,2’-azoxytoluene and 2,4,6-trinitrobenzylideneamine derivatives. The synthesis pathways are provided for all compounds and the detonation parameters are presented for selected compounds.

Trinitrotoluene

Energetic material

10.22211/matwys/0114e

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Citations (2)

NMR spectra of chiral smectic liquid crystals differing in helical parameters

Liquid Crystals (2018)

Marzena Tykarska Anna Drzewicz Mateusz Szala Magdalena Urbańska

Chiral liquid crystals with three-ring rigid core were examined. The method based on the selectively reflected light was used to determine the helical pitch. The helical twist sense was worked out using the polarimetry method. 1H and 13C NMR measurements were performed. The influence of three molecular structure parameters: the type of chiral centre, the length of non-chiral chain and substitution of benzene ring by fluorine atoms, on helical pitch, handedness of helical structure and values of chemical shift in proton and carbon spectra was determined. The change of the length of non-chiral terminal chain has the most significant influence on the temperature dependence of helical pitch. All tested parameters have the biggest influence on the values of chemical shift of atoms in the chiral centre.

Chirality

10.1080/02678292.2018.1441455

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Citations (6)

Sea-dumped ammunition as a possible source of mercury to the Baltic Sea sediments

The Science of The Total Environment (2019)

Jacek Bełdowski Marta Szubska Grzegorz Siedlewicz Ewa Korejwo Miłosz Grabowski

Mercury

Ammunition

Baltic sea

10.1016/j.scitotenv.2019.04.058

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Citations (41)

Explosive Properties and Thermal Stability of Urea‐Hydrogen Peroxide Adduct

Propellants Explosives Pyrotechnics (2016)

Robert Matyáš Jakub Šelešovský Vojtěch Pelikán Mateusz Szala S. Cudziło

Abstract The adduct of urea and hydrogen peroxide (UHP) is industrially produced material on a large scale. Although UHP is widely used as a bleaching and oxidizing agent, its properties as energetic material are generally overlooked. In this work we report comprehensive characterization of UHP explosive and thermal properties. We found that UHP is a compound with a negative value of standard enthalpy of formation (−565.1 kJ mol −1 ). It is not sensitive to impact and friction. However, we demonstrated that UHP ( ρ =0.93 g cm −3 ; packed into a steel pipe with inner diameter of 206 mm) detonates with experimental velocity of detonation (VOD) of 3780 m s −1 . Moreover, for UHP with maximal theoretical density ( ρ =1.43 g cm −3 ), the calculated VOD reaches 5219 m s −1 . Based on our findings, we recommend that present regulations regarding the handling, storage and transportation of the UHP should be revised, especially in cases, where UHP is kept on a large scale, under confinement and at places where the temperature can reach above 60 °C.

Oxidizing agent

Thermal Stability

Detonation velocity

10.1002/prep.201600101

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Citations (17)

Self-sustaining high-temperature synthesis of carbon-encapsulated magnetic nanoparticles from organic and inorganic metal precursors

New Carbon Materials (2010)

M. Bystrzejewski Mateusz Szala Wojciech Kiciński W. Kaszuwara Mark H. Rümmeli

Carbon fibers

10.1016/s1872-5805(09)60017-2

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Citations (7)

Structurally tailored carbon xerogels produced through a sol–gel process in a water–methanol–inorganic salt solution

Journal of Sol-Gel Science and Technology (2010)

Wojciech Kiciński Mateusz Szala M. Nita

The impact of solvent composition as well as inorganic salt content and type on carbon xerogel structure was investigated. Carbon xerogels were derived from the sol–gel polycondensation of resorcinol with furfural in a water–methanol–inorganic salt solution. As inorganic salts, NaCl, NH4ClO4 and FeCl3 were used. In order to conduct an accurate examination of the carbon xerogel structures and textures, inorganic salts were removed prior to carbonization. The xerogel structures can be tailored according to the water/methanol ratio and, to a lesser extent, according to the inorganic salt content and type in the starting solution. As a result, a significant amount of salt can be introduced to the gel network of the desired structure. The morphology and physical properties of the organic xerogels, carbon xerogels and their composites were characterized by means of SEM, N2 sorption and XRD. It was found that samples derived from mixtures with FeCl3 manifest well developed mesoporosity and depleated microporosity in comparison to samples prepared from mixtures with NaCl and NH4ClO4. Iron ions chemically bond to the xerogel matrix and cause its partial graphitization during the carbonization process, resulting in enhanced mesoporosity.

Hydrothermal Carbonization

Carbon fibers

Resorcinol

10.1007/s10971-010-2362-y

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Citations (28)

Analysis of samples of explosives excavated from the Baltic Sea floor

The Science of The Total Environment (2019)

Jakub Nawała Mateusz Szala Daniel Dziedzic Diana Gordon Barbara Dawidziuk

Ammunition

Unexploded ordnance

Baltic sea

10.1016/j.scitotenv.2019.135198

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Citations (17)

Interaction of Gram-Positive and Gram-Negative Bacteria with Ceramic Nanomaterials Obtained by Combustion Synthesis – Adsorption and Cytotoxicity Studies

Polish Journal of Microbiology (2016)

Andrzej Borkowski Filip Owczarek Mateusz Szala Marek Selwet

Abstract This paper presents the interactions of Gram-positive ( Staphylococcus aureus ) and Gram-negative ( Pseudomonas putida ) bacteria with ceramic materials obtained by combustion synthesis. These studies were conducted based on an analysis of the adsorption of bacteria onto aggregates of ceramic materials in an aqueous suspension. The materials used in the studies were of a nanostructured nature and consisted mainly of carbides: silicon carbide (SiC) in the form of nanofibers (NFs) and nanorods (NRs), titanium carbide, and graphite, which can also be formed by combustion synthesis. Micrometric SiC was used as a reference material. Gram-positive bacteria adsorbed more strongly to these materials. It seems that both the point of zero charge value and the texture of the ceramic material affected the bacterial adsorption process. Additionally, the viability of bacteria adsorbed onto aggregates of the materials decreased. Generally, P. putida cells were more sensitive to the nanomaterials than S. aureus cells. The maximum loss of viability was noted in the case of bacteria adsorbed onto NRSiC and NFSiC aggregates.

Pseudomonas putida

Nanomaterials

10.5604/17331331.1204475

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Citations (3)

Properties of Polyethylene Terephthalate (PET) after Thermo-Oxidative Aging

Materials (2021)

R. Panowicz Marcin Konarzewski T. Durejko Mateusz Szala Magdalena Łazińska

The influence of the thermo-oxidative aging semi-crystalline polyethylene terephthalate process on the thermal and mechanical properties was analysed in the article. For this purpose, PET was aged at 140 °C for 21, 35 and 56 days. The research showed that as a result of aging, the amount of the crystalline phase increases by about 8%, which translates into the properties of the aged material. The glass transition and melt temperature of lamellar crystals formed during first and second crystallisation increase with aging. The mechanical properties of the material were analysed in the temperature range of 25 to 75 °C. The tests were showing an increase in Young’s modulus and a decrease in elongation at the break as a result of aging. This phenomenon was particularly visible during tests at 75 °C and during the morphological observation of the fracture surface, where the fracture character of the material changes from ductile to brittle. In the case of the material aged for the longest time, the temperature has a negligible influence on the elongation at break.

Elongation

Brittleness

10.3390/ma14143833

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Citations (61)