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    Wyświetlanie 1-11 z 11
    Tytuł:
    Poliamidy i ich synteza na spolaryzowanych granicach fazowych typu ciecz-ciecz
    Polyamides and their synthesis at the polarized liquid - liquid interface
    Autorzy:
    Kowalewska, Karolina
    Sipa, Karolina
    Skrzypek, Sławomira
    Półtorak, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2200432.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    poliamidy
    spolaryzowane granice cieczowe
    granica fazowa typu ciecz – ciecz
    elektrochemia
    polyamides
    polarized liquid – liquid interface
    liquid – liquid interface
    electrochemistry
    Opis:
    Polyamides have found a number of applications in the commercial sector. These materials belong to a large group of chemical compounds - polymers. The interest in these polymers is still growing as new materials can be formed through chemical functionalization or simply addition of different nanomaterials. Polyamides have many unique properties (e.g. chemical resistance, tensile and abrasion resistance, high thermal stability, non-flammability and high mechanical strength even after long periods of use), and compounds such as Nylon® or Kevlar® are leading components in the production of textiles, laboratory equipment, everyday objects or structural elements. Polyamides are used in automotive industry, aviation, and even as protective materials for the military. Several methods to synthesize polyamides exists to date. The most popular are reactions between carboxylic acid chlorides and amines, polycondensation of carboxylic acids with amines or polycondensation of amino acids. Especially spectacular is a reaction of pulling polyamide thread from the liquid-liquid interface known as the "nylon rope trick" experiment (https://www.youtube.com/watch?v=S6asCwVG8zU). Here, the reaction between 1,6-diaminohexane dissolved in the aqueous phase and adipoyl chloride being present in the immiscible with water organic phase is fast and spontaneous. In this work, we have proved that the synthesis of the polyamides at the liquid-liquid interface can be controlled using electrochemistry. In this respect, the electrochemically driven interfacial ion transfer or electrochemically modulated local pH changes are used to trigger the polycondensation within the locus defined by the liquid-liquid interface. The introduction to the electrified soft junction and its modification with polyamide is discussed in the concerned work.
    Źródło:
    Wiadomości Chemiczne; 2022, 76, 9-10; 789--802
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elektroanaliza z wykorzystaniem granic fazowych typu ciecz-ciecz
    Liquid-liquid interface used for electroanalytical applications
    Autorzy:
    Półtorak, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2200438.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    liquid-liquid interface
    voltammetry
    amines
    ions
    electroanalysis
    granica fazowa typu ciecz-ciecz
    woltamperometria
    aminy
    jony
    elektroanaliza
    Opis:
    This work is focused on the electroanalytical application of the system composed from two immiscible electrolyte solutions also known as the electrified liquid-liquid interface. The particular attention is given to the electroanalytical signals originating from the simple ion transfer reactions (transfer of ion either from the aqueous to the organic or from the organic to the aqueous phase) providing ionic currents that can be probed in a function of the applied potential. Advantages and limitations of the soft junctions are underlines and discussed based on the examples published in the literature. Finally, future directions are given further indicating the utility of the concerned platform for the electroanalytical applications.
    Źródło:
    Wiadomości Chemiczne; 2022, 76, 11-12; 841-860
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemical mechanisms of mineral nanoparticles effects on pulmonary gas/liquid interface studied in model systems
    Autorzy:
    Kondej, D.
    Sosnowski, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/110409.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    inhalation
    nanoparticles
    gas-liquid interface
    dynamic surface tension
    Opis:
    Inhaled mineral nanoparticles which are deposited on the lung surface may influence the gas/liquid barrier and the pulmonary surfactant (PS) which constitutes the vital element of the respiratory system. This research is focused on the physicochemical effects caused by selected clay nanoparticles (bentonite, halloysite, montmorillonites) interacting with PS and changing its original surface activity. Using three measuring methods (pulsating bubble technique, Langmuir balance and drop shape analysis), we demonstrated the influence of different mineral nanoparticles on the dynamic surface tension of animal-derived PS material (Survanta®) and main surfactant phospholipid (DPPC). The results which are dependent on material properties and concentration allow to hypothesize possible pathways of health effects from inhalation of mineral nanoparticles. This may help to set the guidelines in defining occupational safety standards and methods of protection of the respiratory system against inhaled mineral dusts.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 57-69
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interactions of insoluble micro- and nanoparticles with the air-liquid interface of the model pulmonary fluids
    Autorzy:
    Dobrowolska, K.
    Jabłczyńska, K.
    Kondej, D.
    Sosnowski, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/110690.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    lung surfactant
    pulmonary fluids
    air-liquid interface
    compressibility
    nanoparticle
    Opis:
    The work discusses physicochemical phenomena related to interactions between the inhaled particles and the surface of pulmonary fluid which contains the lung surfactant. Dynamic surface phenomena which arise due to periodical variations of the interfacial area during breathing cycle are the extraordinary feature of this system and they are strictly related to the mechanics of ventilation and the pulmonary mass transfer processes. Presence of foreign material such as inhaled micro- and nanoparticles with different size, surface properties and morphology may alter these phenomena which may have some health consequences. This effect is discussed on two examples: mineral particles (CeO2) and carbonaceous particles emitted from diesel engine running on two different fuels. Two experimental methods of research in this field are presented: the Langmuir balance and the oscillating pendant drop. The results show the sensitivity of dynamic surface properties of the lung surfactant on exogenous materials which may be introduced to the respiratory system by inhalation of dusty air. Some physicochemical interpretation of these results is presented.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 151-162
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solid-liquid interface morphology of white carbide eutectic during directional solidification
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354873.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solid-liquid interface
    directional solidification
    front solidification
    white carbide eutectic
    Opis:
    In this paper the analysis of solid-liquid interface morphology in white carbide eutectic was made. In a vacuum Bridgman-type furnace, under an argon atmosphere, directionally solidified sample of Fe - C alloy was produced. The pulling rate was v = 125 μm/s (450 mm/h) and constant temperature gradient G = 33.5 K/mm. The microstructure of the sample was frozen. The microstructure of the sample was examined on the longitudinal section using an light microscope and scanning electron microscope.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 365-368
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solidification Front of Oriented Ledeburite
    Autorzy:
    Trepczyńska-Łent, M.
    Olejnik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/381823.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directional solidification
    ledeburite
    eutectic
    solid interface
    liquid interface
    leading phase
    krzepnięcie kierunkowe
    ledeburyt
    eutektyk
    Opis:
    Directional solidification of the Fe - 4,3 wt % C alloy was performed with the pulling rate equal to v=83 μm/s. Sample was frozen during solidification to reveal the shape of the solid/liquid interface. Structures eutectic pyramid and spherolitic eutectic were observed. The solidification front of ledeburite eutectic was revealed. The leading phase was identified and defined.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 124-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synergistic mechanism of dodecylamine/octanol mixtures enhancing lepidolite flotation from the self-aggregation behaviors at the air/liquid interface
    Autorzy:
    Bai, Yang
    Xu, Mengxu
    Wen, Weixiang
    Zhu, Shifei
    Mo, Weichen
    Yan, Pingke
    Powiązania:
    https://bibliotekanauki.pl/articles/27323641.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    DDA/OCT mixtures
    self-aggregation behaviors
    flotation foam
    molecular dynamics simulations
    surface tension
    air interface
    liquid interface
    Opis:
    Surface tension measurements and molecular dynamics (MD) simulations were used to explore the flotation foam properties and self-aggregation behaviors of dodecylamine (DDA)/octanol (OCT) mixtures formed with different mole ratios at the air/liquid interface. Based on the surface and thermodynamic parameters, the DDA/OCT mixtures exhibited greater interfacial activities and adsorption capacities than their individual components. The MD simulations showed that DDA and OCT were aggregated through hydrogen bonding, coulombic forces and hydrophobic association. OCT was inserted into the DDA adsorption layer, causing the alkyl chains of both DDA and OCT to extend from water to air at varying heights and angles. The addition of OCT improved the hydration of the amino groups and reduced the overall number of hydrogen bonds. The stability of the flotation foam decreased, and the high viscosity and difficult defoaming of the DDA flotation foam were significantly improved. When the DDA/OCT mole ratio was 2:1, the included angle formed between the alkyl chains and the interface was maximized, leading to enhanced compatibility among the alkyl chains, and the hydrogen bond energy was relatively large, which showed a strong synergistic effect. The MD simulation findings were consistent with the results obtained from the lepidolite flotation and surface tension experiments conducted in this study; our results could provide a theoretical foundation for the selection of superior mixed collectors and frothers.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 176510
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości i struktura wody na granicach międzyfazowych
    Properties and structure of water at interfaces
    Autorzy:
    Paluch, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/972292.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    granica faz woda/powietrze
    granica faz woda/ciecz
    granica faz woda/ciało stałe
    water/air interface
    water/liquid interface
    water/solid interface
    Opis:
    The purpose of this paper is to show development of investigations concerning the properties of water at the water/air, water/insoluble liquid and water/solid interfaces. The special attention was drawn on structure and forces acting at those interfaces.
    Źródło:
    Wiadomości Chemiczne; 2019, 73, 7-8; 491-503
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Continuous liquid interface production (CLIP) method for rapid prototyping
    Autorzy:
    Düzgün, D. E.
    Nadolny, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/95197.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    rapid prototyping
    additive manufacturing
    continuous liquid
    3D printing
    Continuous Liquid Interface Production
    CLIP
    szybkie prototypowanie
    wytwarzanie addytywne
    produkcja dodatkowa
    drukowanie 3D
    drukowanie przestrzenne
    Opis:
    Additive Manufacturing (AM) processes such as three- dimensional (3D) printing are one of most important technologies of our century. Additive manufacturing is a manufacturing process in which 3D solid objects are created. It enables the creation of physical 3D models of objects using a series of an additive or layered development framework, where layers are laid down in succession to create a complete 3D object. Additive manufacturing is also known as 3D printing. The strongest reasons for the use of rapid prototypes in manufacturing are the production of parts with a small quantity or a complex shape, the obtaining of lighter parts, the prevention of waste of raw materials, a wider availability of testing and design and further personalization. Continuous liquid interface production (CLIP) is an alternative approach to AM by exploiting the basic principle of oxygen-impaired photopolymerization to create a continuous fluid interface of uncured resin between the growing section and the exposure window.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2018, 2, 1; 5-12
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany ściśliwości powierzchniowej w układzie woda-powietrze zawierającym DPPC i wielościenne nanorurki węglowe
    Surface compressibility of air - water interface containing DPPC and multiwalled carbon nanotubes
    Autorzy:
    Dobrowolska, K.
    Sosnowski, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073294.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    surfaktant płucny
    nanomateriały
    dynamiczne napięcie powierzchniowe
    powierzchnia ciecz-gaz
    lung surfactant
    nanomaterials
    dynamic surface tension
    gas-liquid interface
    Opis:
    Przebadano wpływ wielościennych nanorurek węglowych (MWCNT) na właściwości monowarstwy fosfolipidowej (DPPC) użytej w roli fizykochemicznego modelu surfaktantu płucnego. W oparciu o wyniki badań wykonanych na wadze Langmuira- Wilhelmy’ego stwierdzono, że zarówno hydrofobowe jak i hydrofilowe (utlenione) MWCNT już przy stężeniach rzędu 10-3÷10-2 mg/(cm3 fazy ciekłej) zmieniają ściśliwość powierzchni woda-powietrze zawierającej DPPC. Zmiany mechanicznych cech powierzchni, wynikające z wpływu nanomateriałów na charakter oddziaływań międzycząsteczkowych w warstwie powierzchniowej surfaktantu płucnego, mogą mieć znaczenie dla przebiegu procesów wymiany masy w obszarze pęcherzykowym płuc. Prowadzi to wniosku, że oddychanie powietrzem zawierającym nanorurki węglowe (jako aerozolu) może stwarzać zagrożenie dla prawidłowego funkcjonowania układu oddechowego.
    Influence of multiwalled carbon nanotubes (MCWNTs) on the surface-active properties of phospholipid monolayer (DPPC) at the air - water interface were investigated. The studied system, based on the Langmuir-Wilhelmy film balance, provides a basic physicochemical model of the lung surfactant and allows one to investigate the dynamic interfacial effects. The surface compressibility of DPPC monolayer contaminated with hydrophobic or hydrophilic (oxidized) MWCNTs was altered already at low concentration of nanoparticles in the range of 10-3÷10-2 mg/(cm3 of liquid). Observed effects are probably due to modified intermolecular inter-actions at the interface, and - if happen in vivo - may influence the mass transfer properties in the pulmonary region of the respiratory system. It is concluded that breathing with air contaminated by aerosolized carbon nanotubes may be not safe because of a potential influence of this nanomaterial on the dynamic surface activity of the lung surfactant.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2017, 4; 114--115
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of natural surfactants present in sea waters at surfaces of minerals: contact angle measurements
    Autorzy:
    Mazurek, A.
    Pogorzelski, S.J.
    Boniewicz-Szmyt, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/48416.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    mineral
    Baltic Sea
    natural surfactant
    solid-liquid interface
    Gdansk Gulf
    film pressure
    contact angle hysteresis
    film-covered surface
    sea water
    adsorption
    Opis:
    The wetting properties of solid mineral samples (by contact angles) in original surfactant-containing sea water (Gulf of Gdańsk,Ba ltic) were characterised under laboratory conditions on a large set (31 samples) of well-classified stones of diverse hydrophobicity using the sessile drop (ADSA-P approach),ca ptive bubble and inclined plate methods. An experimental relation between the static contact angle θeq and stone density ρ was obtained in the form θeq = Bρ + C,wher e B = 12.23 ± 0.92, C = −(19.17 ± 0.77),an d r2 = 0.92. The histogram of θeq distribution for polished stone plates exhibited a multimodal feature indicating that the most abundant solid materials (hydrophilic in nature) have contact angles θeq = 7.2,10. 7,15. 7 and 19.2◦,whic h appear to be applicable to unspecified field stones as well. The contact angle,a pH-dependent quantity,ap pears to be a sensitive measure of stone grain size,e.g . granite. The captive bubble method gives reproducible results in studies of porous and highly hydrophilic surfaces such as stones and wood. The authors consider the adsorption of natural sea water surfactants on stone surfaces to be the process responsible for contact angle hysteresis. In the model,an equation was derived for determining the solid surface free energy from the liquid’s surface tension γLV; it also enabled the advancing θA and receding θR contact angles of this liquid to be calculated. Measurements of contact angle hysteresis Δθ(= θA − θR) with surfactant-containing sea water and distilled water (reference) on the same stone surfaces allowed the film pressure ΔΠ (1.22 to 8.80 mJ m−2), solid surface free energy ΔγS (−17.03 to −23.61 mJ m−2) and work done by spreading ΔWS (−1.23 to −11.52 mJ m−2) to be determined. The variability in these parameters is attributed to autophobing,an effect operative on a solid surface covered with an adsorptive layer of surfactants. The wetting behaviour of solid particles is of great importance in numerous technological processes including froth flotation,d emulgation,an ti-foaming procedures and the coal industries. It is believed that the approach presented here and the examples of its application to common sea water/solid mineral systems could be successfully adapted to optimise several surfactant-mediated adsorption processes (see below) of practical value in natural water ecology.
    Źródło:
    Oceanologia; 2009, 51, 3; 377-403
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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