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    Wyświetlanie 1-6 z 6
    Tytuł:
    Significance of reagents addition sequence on iron anionic reverse flotation and their adsorption characteristics using QCM-D
    Autorzy:
    Hou, Ying
    Sobhy, Ahmed
    Wang, Yue
    Powiązania:
    https://bibliotekanauki.pl/articles/1448929.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    iron oxide
    adsorption
    pH modifier
    starch
    reverse flotation
    QCM-D
    Opis:
    To explore the influence of reagents addition sequence of the pH regulator and the starch depressant on the anionic reverse flotation of iron oxide, flotation conditional experiments were performed on mixed low-intensity and high-gradient magnetic concentrates which is the flotation feed acquired from the iron processing plant. Besides, quartz crystal micro-balance with dissipative (QCM-D) was conducted to detect the adsorption phenomena of the flotation reagent on iron oxide sensors at different addition orders. The outcomes showed that the flotation performance using the pH regulator prior to the depressant was the best. For example, at 1.6 kg/Mg starch dosage, the recovery and separation efficiencies were improved by 18.3% and 21.2%, respectively, with keeping the concentrate Fe grade as high as 69.5%. Also, QCM-D frequency shifted by -41 Hz from 17 Hz to -24 Hz with increased dissipation from -2.6 x 10-6 to 8.2 x 10-6, indicating an increase in the mass of slightly-rigid starch adsorption layer on the surface of iron oxide under a strong alkaline condition with adsorption density of about 0.46 mg/cm2. On the other hand, under weak alkaline conditions, starch was adsorbed, and then the starch was desorbed upon the addition of the strong alkaline solution. Whereas, adding the pH modifier to create a strong alkaline condition enhanced the starch adsorption significantly with coordination and hydrogen bonds, and prevented the following adsorption of the anionic collector for more efficient reverse flotation of iron oxide minerals.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 284-293
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reverse anionic flotation of dolomitic collophanite using a mixed fatty acid collector : adsorption behavior and mechanism
    Autorzy:
    Xu, Wei
    Liang, Qun
    Tian, Yan
    Mei, Guangjun
    Powiązania:
    https://bibliotekanauki.pl/articles/2146926.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    collophanite
    anionic collector
    dolomite
    QCM-D
    adsorption mechanism
    Opis:
    Collophanite in south China generally has a high MgO level, which negatively impacts wet-process phosphoric acid production and cannot be utilized directly. A novel mixed fatty acid soap (GSWF01) was employed as a collector for dolomite. A single reverse flotation experiment was performed on a dolomitic collophanite from Guizhou, China under different pH and collector dosages. A phosphate concentrate with P2O5 grade of 33.73%, MgO content of 1.07%, MER value (ω(MgO+Al2O3+Fe2O3)/ω(P2O5)) of 4.86% and phosphorus recovery of 91.06% was obtained. The beneficiation indexes of GSWF01 were better than that of sodium oleate (NaOL). The adsorption behavior and mechanism of GSWF01 on dolomite surface were investigated using quartz crystal microbalance with dissipation (QCM-D), atomic force microscope (AFM), infrared spectrometer (IR), and zeta potentiometer. The results revealed that GSWF01 chemically reacted with metal ions (Ca2+, Mg2+, etc.) on the surface of dolomite to generate fatty acid salt precipitation (chemisorption). The adsorbed layer transitioned from dense to loose in two stages, resulting in a stable double-layer adsorption structure. Moreover, in a weak acidic solution environment, physical adsorption of fatty acid molecules (RCOOH ((aq)) and fatty acid ion-molecular association compounds (RCOOH• RCOO-) generated by hydrolysis can also occur on the dolomite surface. These are the main reasons for the hydrophobic floating of dolomite. This is of great significance to the development of a novel high-efficiency dolomite collector and the enhancement of flotation process for carbonate collophanite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 151519
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular structure and formation of chitosan and pectin based thin films
    Autorzy:
    Chudinova, Yuliya V.
    Kurek, Denis V.
    Varlamov, Valery P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1034650.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Atomic force microscopy (AFM)
    QCM-D
    chitosan
    layer-by-layer (LbL)
    pectin
    thin layers
    Opis:
    In this study using methods of Atomic force microscopy (AFM) and Quartz crystal microbalance with dissipation monitoring (QCM-D) the special characteristics of formation and architecture of thin films coatings based on natural polysaccharides chitosan and pectin were investigated. A layer-by-layer (LbL) deposition technique for assembling of oppositely charged layers was used. The main factors, which have an influence on the process of thin film formation and molecular structure of these coatings, were investigated.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 18-26
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption mechanism of sodium oleate on titanium dioxide coated sensor surface using quartz crystal microbalance with dissipation
    Autorzy:
    Fan, G.
    Liu, J.
    Cao, Y.
    Feng, L.
    Xu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/110014.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    QCM-D
    TiO2 coated sensor surface
    sodium oleate
    adsorption mechanism
    Opis:
    Quartz Crystal Microbalance with Dissipation (QCM-D) was firstly applied to investigate the adsorption mechanism of sodium oleate on TiO2 coated sensor surface. The effects of pH value, sodium oleate concentration, and temperature on TiO2 coated sensor surface were evaluated systematically using the QCM-D technique. Zeta potential, surface tension, adsorption isotherms, and adsorption thermodynamics were employed to characterize the adsorption process. The results showed the advantages of QCM-D on the investigation of the adsorption process. Additionally, the electrostatic equilibrium adsorption data was well matched to the Langmuir isotherm. Based on the thermodynamic analysis, adsorption was a spontaneous and endothermic physisorption process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 597-608
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorpcja lizozymu – charakterystyka struktur białkowych z zastosowaniem metody mikrowagi kwarcowej z monitorowaniem dyssypacji energii oraz powierzchniowego rezonansu plazmonów
    Autorzy:
    ĆWIĘKA, MONIKA
    Powiązania:
    https://bibliotekanauki.pl/articles/1034112.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    MP-SPR
    QCM-D
    adsorpcja białek
    lizozym
    Opis:
    Lysozyme (LSZ) exhibits strong antibacterial activity against gram-positive bacteria. This property has found practical applications in the medicinal and pharmaceutical industries. Elucidating protein orientation on a nanoscale surface has important implications for integrat- ing proteins into micro- and nano-fabricated devices. Analysis of conformational changes of proteins by quartz crystal microbalance (QCM-D) and surface plasmon resonance (MP-SPR) was performed. Both methods can be used to study protein adsorption phenomena (adsorbed amount and the thickness of protein layer). A combination of QCM-D and MP-SPR methods makes it possible to draw conclusions about the factors that control the interactions between LSZ and the surface of gold. pH strongly affects the effectiveness of LSZ adsorption onto the surface and leads to orientations changes of protein on the surface. The highest adsorption value was attained near the I.E.P. This data clearly indicates that electrostatic interactions are a driving force for LSZ adsorption and significantly affect the topography of layers formed on the surface. Furthermore, these meas- urements show high hydration (60%) of LSZ layer on surface of gold.
    Źródło:
    Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe; 2014, 9; 35-54
    2082-3827
    2084-977X
    Pojawia się w:
    Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new scheme of the environmental classification standards for the bronze cultural relic’s preservation in museums
    Autorzy:
    Li, Dandan
    Zhou, Hao
    Xu, Fangyuan
    Yan, Ying
    Wu, Laiming
    Cai, Lankun
    Powiązania:
    https://bibliotekanauki.pl/articles/28407393.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    QCM
    temperature
    humidity
    indoor exposure
    cultural relics
    mikrowaga kwarcowa
    temperatura
    wilgotność
    ekspozyja w pomieszczeniach
    zabytki kultury
    Opis:
    The environmental risk classification of the metal relics is usually determined by the corrosion rate of the metal but it is difficult to monitor the deterioration of the metal relics directly. A strong relationship exists between indoor exposure, the air quality classification of atmospheric corrosion, and the actual deterioration of metal relics. The copper-silver hanging plate method requires a long period of environmental exposure and has certain hysteresis, thus reflecting the current environmental quality of the museum in real time poses some difficulties. However, the application of the environmental reactivity monitor (ERMs) based on the piezoelectric effect can solve the above problems. The invented quartz crystal microbalance (QCM) reactivity monitoring device is applied to study the influence of temperature and humidity on the corrosion of the bronze-simulated materials and the relationship between the corrosion depth rate of the bronze-simulated materials and the frequency change of the crystal oscillator. Then, the recommended classification range of temperature and humidity and the airquality classification standards for the preservation environment of the bronze cultural relics in museums are proposed.
    Źródło:
    Environment Protection Engineering; 2023, 49, 4; 45--59
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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