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  • 1
    Electronic Resource
    Electronic Resource
    Explosive properties of the compositions CCl4 + Al + ZnO (1994)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 19 (1994), S. 87-89 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The compounds CCI4 + Al + ZnO were suitably prepared, so that its ability to detonate could be investigated. The detonation velocity (D) dependence on the charge density (ρ) has been established. The increase of density above 1.8 kg/dm3 particle velocity was measured. Extraordinarily low parameters of detonation are explained by the special peculiarity of the explosion products.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19940190206
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    Paper (German National Licenses)
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  • 2
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    Use of a solid fuel in a gasdynamic laser (1982)
    Institute of Physics
    Details
    Publication Date: 1982-01-31
    Print ISSN: 0049-1748
    Topics: Physics
    Published by Institute of Physics
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  • 3
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    Do bacterial viruses affect framboid-like mineral formation? (2022)
    In:  Biogeosciences
    Details
    Publication Date: 2022-10-05
    Description: Framboidal pyrite has been a matter of interest of many studies due to its abundance in a wide range of environments and being a marker of redox conditions. However, the clear origin of framboidal pyrite remains unresolved. Our studies are preliminary laboratory investigations on the influence of the shape and physicochemical properties of bacteriophages on the synthesis of framboid-like structures. This paper discusses the possible role of bacteriophages (bacterial viruses) in the precipitation of sulfide minerals (FeS and CuS) and their impact on the formation of framboid-like structures. Here, two bacteriophages (Escherichia phage P1 and Pseudomonas phage Φ6), which differ significantly in shape and physicochemical properties, were used. Our observations suggest that viruses may bind ions from the solution. Moreover, we showed that bacteriophages P1 can lead to the formation of finer mineral particles of FeS and CuS, whereas the framboid-like structures were found only in experiments with precipitation of FeS. However, the lipid-enveloped Pseudomonas phage Φ6 did not cause the formation of similar structures. It is assumed that Escherichia phage P1 can promote the formation of FeS-based framboid-like or spherical structures. The proposed four-step conceptualized mechanism facilitating the framboid-like structure synthesis via viruses is as follows: (i) binding of ions by capsids, (ii) bacteriophages behaving like a crystallization surface, (iii) destabilization of the colloid (ζ potential ± 0), and (iv) formation of fine agglomerates and subsequent formation of small crystallites. Further studies are required to find all factors that may be affected by bacteriophages during sulfide precipitation. In addition, it is important to consider viruses present in sedimentation environments, despite possible difficulties in laboratory culturing. The consideration of such viruses may make laboratory testing more valid in terms of sedimentation environments.
    Type: info:eu-repo/semantics/article
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  • 4
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    The Raman spectroscopy and SEM/EDS investigation of the primary sources of microplastics from cosmetics available in Poland (2022)
    In:  Chemosphere
    Details
    Publication Date: 2022-10-05
    Description: The increasing amount of marine microplastics and nanoplastics is due to primary (P-MPs) and secondary sources (S-MPs). Among small P-MPs and fibres from textiles, nurdles or industrial dust, the microbeads from cosmetics (peelings, scrubs) are dominant. The polyethylene and polypropylene debris, already 〈5 mm, enlarge Plastisphere and have a complex influence on environmental processes. Fortunately, the situation has changed with the limitation of synthetic materials in scrubs in recent years. This paper summarizes the six years of studies (2015–2021) on microplastics in cosmetics available on the Polish market. It focuses on those still available and presents the potential of Raman spectroscopy for the efficient qualitative and quantitative characterization of those materials. Finally, surface morphology's vital role in microplastics' general behaviour is underlined. The SEM/EDX and numerical modelling enables a more detailed description of particles.
    Type: info:eu-repo/semantics/article
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  • 5
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    Surface modification of magnetic nanoparticles by bacteriophages and ionic liquids precursors (2023)
    In:  RSC Advances
    Details
    Publication Date: 2023-02-02
    Description: Magnetic nanoparticles (MNPs) have recently been a point of interest for many researchers due to their properties. However, the studies on the influence of bacteriophages on the synthesis of MNPs seem to be lacking. Furthermore, bacteriophage-modified MNPs have not been combined with n-alkyl quaternary ammonium ionic liquid precursors (QAS). In this study, the aim was to assess the influence of two distinctly different bacteriophages (Escherichia phage P1 and Pseudomonas phage Φ6) on MNPs synthesis in the presence or absence of QAS. Synthesized MNPs have been characterized with X-ray diffraction (XRD) and Mössbauer spectroscopy in terms of changes in the crystallographic structure; scanning electron microscopy (SEM) for changes in the morphology; and ζ-potential. Moreover, the sorption parameters and the loss of viability of bacteria that interacted with MNPs have been determined. The sorption of bacteria differs significantly among the tested samples. Furthermore, the viability of the bacteria adsorbed on MNPs varies in the presence of QAS, depending on the length of the n-alkyl chain. The study has revealed that MNPs can be bound with bacteriophages. Mössbauer spectroscopy has also revealed the probable influence of bacteriophages on the formation of crystals. However, these phenomena require further studies.
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  • 6
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    Characterization of Waste from the Dicalcium Phosphate Industry as a Potential Secondary Source of Rare Earth Elements (2023)
    In:  Materials Proceedings
    Details
    Publication Date: 2024-03-11
    Description: Fluorite-rich sludge is the main waste from dicalcium phosphate (DCP) production. This sludge consists of 40–60% of CaF2, which precipitates during the reaction between fluorapatite (the main component of raw phosphorite material) and HCl. In addition, the sludge contains elevated amounts of critical elements such as REEs. In this study, two industrial sites producing DCP in Spain were studied to assess the potential valorization of these sludges. Currently, almost 2 Mt of waste remains landfilled in these sites. The concentrations of Y, La, Nd, Dy, and Gd found within the residues are about 1100 ppm, 450 ppm, 300 ppm, 80 ppm, and 75 ppm, respectively. Fluorite, being the host mineral of the REEs, occurs as very fine-grained spherules (〈5 μm) that are smaller than other minerals in the waste (quartz, gypsum), favoring the options of hydrometallurgical separation. REEs extraction from the fluorite could be an advantageous option, if separated from uranium, which is the main environmental concern of the future valorization of this kind of waste.
    Type: info:eu-repo/semantics/article
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  • 7
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    5-fluorouracil and curcuminoids extract from Curcuma longa L. loaded into nanohydroxyapatite as a drug delivery carrier for SKOV-3 and HepG2 cancer cells treatment (2023)
    In:  Ceramics International
    Details
    Publication Date: 2023-11-13
    Description: Nanostructural hydroxyapatite (HAp) with a uniform rod-like shapes sized in 8 ± 1 nm diameter and 45 ± 9 nm length was prepared within the facile and cost-effective co-precipitation technique as a porous platform for the immobilization and release of an anticancer drug – 5-fluorouracil. The HAp was stabilized with the biologically active curcuminoids directly extracted from Curcuma longa L. rhizome such as curcumin (curcumin I), demethoxycurcumin (curcumin II), bisdemethoxycurcumin (curcumin III). Due to the high surface: volume ratio HAp offered a high intake of biologically active compounds. Turbidimetry results confirmed the stability of the aqueous suspension of the modified HAp. In vitro tests on SKOV-3 and HepG2 model cell lines examined by MTS assay lines revealed the cytotoxicity of nanocomposite loaded with drug and curcuminoids. In addition, Langmuir trough method was used to study the effect of proposed nanocomposite on biomimetic membranes.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 8
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    REE Concentrations in Secondary Uranium Minerals from the Izera Metamorphic Complex (SW Poland) (2023)
    In:  Minerals
    Details
    Publication Date: 2024-02-05
    Description: The subject of this work was supergene uranium mineralization and the YREE concentrations within. YREE differentiation patterns were used to recreate the prevailing crystallization conditions of abandoned mine dumps in Kromnów, Kopaniec, and Radoniów, located in the Izera Metamorphic Complex, Sudetes Mts. The collected samples were investigated using PXRD, SEM-EDS, and EPMA. YREE concentrations were measured using LA-ICP-MS. The secondary uranium mineralization from these locations consists of phosphates (meta-autunite, meta-torbernite, metauranocircite-I, saleéite, bassetite, phosphuranylite), arsenates (zeunerite), silicates (uranophane, sklodowskite), and uranyl hydroxides (likely becquerelite). Moreover, in Radoniów, phosphuranylite was found; it had not been found in Poland previously. Uranyl mineral assemblages indicate the diversity of chemistry of their mother solutions and suggest their weakly acidic character. The YREE content in secondary uranium minerals also reflects the pore solutions’ chemistry variation. The negative Y anomaly is observed in all uranyl phases. Similar behavior of Sm is also noted, excluding metatorbernite and torbernite. Among the uranyl minerals studied, only metatorbernite from Kromnów showed a positive Nb anomaly, which was probably related to proximity to weathering in YREE-breeding phases. Nevertheless, the YREE and chemical results suggest that this mineralization originated from the oxidizing solutions generated during the weathering of primary hydrothermal mineralization. In order to better understand the weathering zones in these locations, more detailed studies on pore solution chemistry are needed.
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  • 9
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    Barite, Anhydrite and Gypsum Reference Materials forIn SituOxygen and Sulfur Isotope Ratio Measurements (2024)
    In:  Geostandards and Geoanalytical Research
    Details
    Publication Date: 2024-02-26
    Description: Secondary ion mass spectrometry was used to test the d18O and d34S nanogram-scale homogeneity of a suite of candidate sulfate minerals, ultimately selecting three barite, two anhydrite, and two gypsum samples from the Royal Ontario Museum that have repeatabilities for their SIMS measurements of better than 0.39‰ and 0.37‰ (1s) for oxygen and sulfur isotope ratios, respectively. Metrological splits of each of the seven materials were sent to multiple gas source isotope ratio mass spectrometry laboratories in order to establish their absolute 18O/16O and 34S/32S ratios. The inter-laboratory results of GS-IRMS analyses yielded reasonably narrow ranges in d18OVSMOW, whereas larger variations in d34SVCDT values were found between the results from the gas source laboratories. All samples have good reproducibility within laboratories of GS-IRMS 103d18O values of between 0.24‰ and 0.44‰ (1s). The reproducibility within laboratories of GS-IRMS 103d34S values range from 0.07‰ to 0.99‰ (1s). Here we also discuss some of the current analytical limitations affecting these isotope-mineral systems. A total of 256 metrological splits have been prepared from each of these seven materials; these aliquots will be made available to the global geochemical community.
    Language: English
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  • 10
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    Geochemical behavior of heavy metals and radionuclides in a pit lake affected by acid mine drainage (AMD) in the Muskau Arch (Poland) (2024)
    In:  Science of the Total Environment
    Details
    Publication Date: 2024-02-06
    Description: Pit lakes in the ‘anthropogenic lake district’ in the Muskau Arch (western Poland; central Europe) are strongly affected by acid mine drainage (AMD). The studied acidic pit lake, ŁK-61 (pH 〈3), is also exposed to floods due to its location in the flood hazard area, which may significantly influence the geochemical behavior of elements. The elemental compositions of water and lake sediment samples were measured with ICP–OES and ICP–MS. The sediment profile was also examined for 137Cs and 210Po activity concentrations using gamma and alpha spectrometry, respectively. Grain size distribution, mineralogical composition, diatoms, and organic matter content in the collected core were also determined. The key factors responsible for the distribution of selected heavy metals (e.g., Cu, Ni, Pb, Zn) and radioisotopes (137Cs and 210Po) in the bottom sediments of Lake ŁK-61 are their coprecipitation/precipitation with Fe and Al secondary minerals and their sorption onto authigenic and allogenic phases. These processes are likely driven by the lake tributary, which is an important source of dissolved elements. The data also showed that the physiochemical parameters of Lake ŁK-61 water changed during an episodic depositional event, i.e., the flood of the Nysa Łużycka River in the summer of 2010. The flood caused an increase in the water pH, as interpreted from the subfossil diatom studies. The down-core profiles of the studied heavy metal and radionuclide (HMRs) contents were probably affected by this depositional event, which prevented a detailed age determination of the collected lake sediments with 137Cs and 210Pb dating methods. Geochemical modeling indicates that the flood-related shift in the physicochemical parameters of the lake water could have caused the scavenging of dissolved elements by the precipitation of fresh secondary minerals. Moreover, particles contaminated with HMRs have also possibly been delivered by the river, along with the nutrients (e.g., phosphorus and nitrogen).
    Language: English
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