191 research outputs found
Modelling of interactions of polar and nonpolar pollutants with soil minerals and soil organic matter
Environmental pollution of soils by organic contaminants such as pesticides is one of the serious problems of our civilization. Contaminants can undergo various physical, chemical and biological transformation processes in soils governing behaviour, distribution, and fate of organic species in environment and subsequent environmental risks. Mechanistic understanding of molecular interactions of organic pollutants with main soil components represents a key factor for estimating the behaviour of contaminants in soils. Molecular modelling offers an opportunity to investigate and characterize various details of these interactions at molecular level providing specifications, which are difficult to obtain at the experimental level. This work represents a comprehensive overview of our investigations of the molecular interactions of organic contaminants with selected soil components. Particularly, we focused on the characterization of the structure and the surface complexation of the phenoxyacetic acid derivatives (herbicides MCPA and 2,4-D) and typical soil minerals such as clay minerals (kaolinite and montmorillonite) and iron oxyhydroxides (goethite and lepidocrocite). Further, interactions of several representative nonpolar polycyclic aromatic hydrocarbons (e.g. naphthalene, anthracene, pyrene, and phenanthrene) with iron oxyhydroxides were modelled, as well. It was found that in case of polar species, hydrogen bonds and electrostatic interactions play an important role in the formation of the surface complexes. In case of nonpolar PAHs, dispersion forces dominate in the planar stacking of the PAHs molecules on mineral surfaces. Another study focused at a complex 3D model representing humic substances firstly, featuring polar hydrophilic and nonpolar hydrophobic domains and also a nanopore SOM structure. This model was taken to simulate trapping and interactions of MCPA (polar) and naphthalene (nonpolar) species inside of the nanopore. It was found that MCPA is preferentially stabilized close to polar functional groups (carboxyl) whereas naphthalene interacts mostly with nonpolar aliphatic chains through dispersion interactions
Structures and properties of bioorgano-clays
Interactions between microbial matter and clays are a common interfacial phenomenon in soil and sediment environments. However, fundamental mechanisms governing the formation and interactions of clay minerals with microbial-derived organic substances are still poorly understood. Therefore, our central aim was to study the formation of bioorgano-clay composites and their specific material properties and compare these properties with those of well-studied organo-clays.
Pure organic cations (e.g., alkylammonium homologues) and complex microbial biomass (e.g., fungal biomass from Aphanocladium sp.) were used to prepare organo- and bioorgano-clays by varying the amount of clay (montmorillonite) and organic materials used. Interaction mechanisms between organic materials and clay and the resulting structure and physicochemical properties were explored by multiple experimental methods (e.g. IR spectroscopy, contact angle, zeta potential, X-ray photoelectron spectroscopy, transmission electron microscopy) in a combination with molecular modelling to determine the structure, composition, and properties of the prepared bioorgano-clays.
Depending on origin, type, and size of the organic material and the clay, two basic types of bioorgano-clays were found: (i) bioorgano-clays having their clay particles coated by bioorganic matter with only limited or no penetration into interlayer galleries and (ii) bioorgano-clays having bioorganic matter distributed in the interlayer galleries and/or on the external surfaces of clay particles. Both types show heterogeneous arrangements of the amended organic matter inducing differences in shape and size of organo-clay particles. Consequently, changes in pore volumes, stability, and elemental interface properties can be verified. Compared to organo-clays, bioorgano-clays provided e.g. a higher adsorption capacity for uranyl, suggesting that modification of clays by rather unspecific microbial compounds significantly enhanced the number of exchange sites. Bioorganic-clays, although being less specific in nature, might therefore be applied more broadly in situations where a high sorption capacity, e.g., for contaminants, is required
Structure of hydrated calcium carbonates: A first-principles study
The structures of both ikaite (CaCO3·6H2O) and monohydrocalcite (CaCO3·H2O) were computed at the PBE0 level of theory, using all electron Gaussian type basis sets. Correction for the long-range dispersion contribution was included for the oxygenâoxygen interactions by using an additive pairwise term with the atomic coefficients fitted against the calcite vs aragonite enthalpy difference. The potential chirality of monohydrocalcite is discussed, as well as the helical motifs created by the three-fold rototranslational axes parallel to the [001] direction. These elements represent a significant link between monohydrocalcite and vaterite, both appearing as intermediate species during CaCO3 crystallization from amorphous calcium carbonate. The hydrogen bond pattern, never fully discussed for monohydrocalcite, is here described and compared to the available experimental data. Both phases are characterized by the presence of hydrogen bonds of moderate to high strength. Water molecules in monohydrocalcite interact quite strongly with 2 View the MathML source units through such hydrogen bonds, whereas their interaction with each other is minor. On the contrary, water molecules in ikaite create a complex network of hydrogen bonds, where each water molecule is strongly hydrogen bonded to one View the MathML source anion and to one or two other water molecules
Periodic Density Functional Theory Investigation of the Uranyl Ion Sorption on Three Mineral Surfaces: A Comparative Study
Canister integrity and radionuclides retention is of prime importance for assessing the long term safety of nuclear waste stored in engineered geologic depositories. A comparative investigation of the interaction of uranyl ion with three different mineral surfaces has thus been undertaken in order to point out the influence of surface composition on the adsorption mechanism(s). Periodic DFT calculations using plane waves basis sets with the GGA formalism were performed on the TiO2(110), Al(OH)3(001) and Ni(111) surfaces. This study has clearly shown that three parameters play an important role in the uranyl adsorption mechanism: the solvent (H2O) distribution at the interface, the nature of the adsorption site and finally, the surface atomsâ protonation state
Study of the effect of engine oil wear and operational load on the load-bearing capacity of the lubricating film
Pro sprĂĄvnou funkci motoru je dĆŻleĆŸitĂ© vytvoĆenĂ olejovĂ©ho filmu mezi pohyblivĂœmi ÄĂĄstmi motoru. StĂĄrnutĂ motorovĂ©ho oleje ovlivĆuje jeho schopnosti tento film vytvoĆit a udrĆŸovat. Tato schopnost je hlavnÄ ovlivnÄna zmÄnou viskozity, a to degradacĂ a kontaminacĂ neÄistostmi, coĆŸ vede k snĂĆŸenĂ Ășnosnosti mazacĂho filmu. Tato bakalĂĄĆskĂĄ prĂĄce se zabĂœvĂĄ vlivem opotĆebenĂ a zatĂĆŸenĂ na Ășnosnost olejovĂ©ho filmu. Tyto vlastnosti jsou hodnoceny na vĂœsledkĂĄch zĂskanĂœch pomocĂ Stabingerova viskozimetru, FTIR spektrometru a Reichertova testu.For proper engine function, it is important to create an oil film between the moving parts of the engine. The aging of the engine oil affects its ability to create and maintain this film. This ability is mainly influenced by changes in viscosity due to degradation and contamination with impurities, which leads to a decrease in the load-bearing capacity of the lubricating film. This bachelor's thesis deals with the impact of wear and load on the load-bearing capacity of the oil film. These properties are evaluated based on the results obtained using a Stabinger viscometer, FTIR spectrometer, and Reichert test.DopravnĂ fakulta Jana PerneraStudent pĆednesl obhajobu svĂ© bakalĂĄĆskĂ© prĂĄce a s pouze malĂœmi zavĂĄhĂĄnĂmi reagoval na otĂĄzky ÄlenĆŻ komise.DokonÄenĂĄ prĂĄce s ĂșspÄĆĄnou obhajobo
Break & enter - a silo renewal
Abweichender Titel laut Ăbersetzung der Verfasserin/des VerfassersEin nicht mehr gebrauchter Zementsilo in Stupava (Slowakei) wird in ein Hotel umgewandelt. Das Konzept der Silo-Umnutzung geht von dem Gedanken aus, dass das ursprĂŒngliche Objekt mit neuen Formen befallen wird, die ihn sich als Basis ihrer Existenz aneignen. Dieser fiktive Parasit sind gerade die Hotelzimmer, das Grundelement des neuen Raumprogrammes. In einem bespielten Raster sind sie an der Ă€uĂeren Schale angesaugt, durchdringen Sie um sich Zugriff zum inneren Klima zu verschaffen. Es erfolgt das Durchbrechen der Schale "Break" gefolgt von dem Eindringen "Enter". Die Konzeption des Hotels könnte man in diese grundsĂ€tzlichen Einheiten enteilen: * Die Basis * Die TĂŒrme mit den Hotelzimmern * Aussichtskubus auf dem Dach Die Basis versucht formal den anderen Teilen unterlegen zu sein, sie versucht mit den umliegenden GrĂŒnflĂ€chen zu verschmelzen. Es findet hier die erste Verbindung mit der Umwelt statt, deshalb soll mit ihr eine ausreichende visuelle wie auch formale VerknĂŒpfung gewĂ€hrleistet werden.Die Basis bildet eine Art Hinterland des ganzen Projektes, von dem die TĂŒrme alles nötige in die parasitierenden Organismen also die Hotelzimmer ĂŒbertragen. Das Innere des Silos bleibt als ungeteilter Freiraum erhalten, der nur von den nach Innen ĂŒberragenden Kuben der Hotelzimmer, und den ĂberbrĂŒckungen der ErschlieĂung gegliedert wird. So entsteht ein unerkannter Raumeindruck. Die ĂberbrĂŒckungen durchqueren in einer freien Anordnung den Raum wodurch eine fast abstrakte Komposition geschaffen wird. Der vertikale Eindruck des Raumes wird durch verglaste Oberseiten der Zylinder unterstĂŒtzt, die den benötigten Anteil an Tageslicht in den Raum hineinlassen. Die Kuben der Hotelzimmer bilden eine Art Membrane zwischen der Panorama im Exterieur und dieser beeindruckenden InnenraumatmosphĂ€re. Die Beendigung des ganzen Objektes ist der groĂe Aussichtskubus, der ĂŒber dem Silo "schwebt". Das Konzept geht im Allgemeinen davon aus, das der Ă€uĂere Ausdruck des Silos nicht unbedingt erhalten bleiben muss. Es werden nur seine hauptsĂ€chlichen QualitĂ€ten extrahiert und in einem neuen Gewand wieder zum Leben erweckt. Der "Befall" des Alten mit Neuem fĂŒhrt zur Entstehung einen neuen Organismus.6
Hydrophobicity and Charge Distribution Effects in the Formation of Bioorganoclays
Interactions of bioorganic moieties with clay minerals have attracted attention not only from the perspective of novel bioclay materials but also because they play a crucial role in our understanding of physical and chemical processes in soils. The aim of the present article is to explore the interactions responsible for the formation of a phosphatidylcholine-kaolinite bioclay by employing a series of classical molecular dynamic simulations. Detailed analysis of the structure and energies of the resulting bioclays reveals that the phosphatidylcholine molecules bind to the kaolinite surface either via their zwitterionic heads or hydrophobic aliphatic tails, depending on the kaolinite surface characteristics and the density of organic coating. The phosphatidylcholine molecules have a tendency to form irregular layers with a preferred parallel orientation of molecules with respect to the kaolinite surface. The tails exhibit varying degrees of flexibility and disorder depending on their distance from the surface and the density of surface coating. Significant differences in the binding can be spotted with respect to the two types of kaolinite basal surfaces, i.e., the hydrophobic siloxane surface, which possesses a considerable dispersion character, and the hydrophilic alumina surface, polarized by the surface hydroxyl groups
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