Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Cellulose" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-7 z 7
    Tytuł:
    Dispersion of sodium phytate on muscovite and the implications for arsenopyrite flotation
    Autorzy:
    Zou, Dan
    Wang, Zhen
    Zhao, Kaile
    Xu, Ying
    Powiązania:
    https://bibliotekanauki.pl/articles/2175449.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cassiterite
    chlorite
    sodium oleate
    carboxymethyl cellulose
    selective inhibition
    Opis:
    The effective flotation separation of sulfides and sliming silicate minerals is always a difficult problem. In this paper, the selective flotation of arsenopyrite from muscovite was studied by using sodium phytate (SP) as dispersant, and the mechanism was investigated through SEM/EDS, zeta potential, FTIR and XPS measurements. Single mineral flotation results showed that with the increasing isoamyl xanthate (IAX) dosage the recovery of arsenopyrite increased, until 8×10−5 mol/L IAX (79.40% recovery, pH=7), after that it decreased slightly. While muscovite floated poorly at any IAX concentration. For the mixed minerals, arsenopyrite recovery was only 54.63% while that of muscovite was 42.70%, which was attributed to the coverage of muscovite on arsenopyrite surface. When 6×10−5 mol/L SP was added into the mixed minerals system, the recovery of arsenopyrite recovered to 68.26% while that of muscovite was 8.48% (approximate the value of the single mineral). SEM/EDS results showed that SP could disperse muscovite and prevented its coverage on arsenopyrite surface. Zeta potential results showed that the electrokinetic potential of muscovite and arsenopyrite decrease from -26.60mV to -39.01 mV and from -26.90 mV to -27.84 mV at pH=7, respectively. It was obvious that the negatively charged phytate ions selectively adsorbed on the surface of muscovite. FTIR and XPS resulted co-proved the chemisorption of SP with active sites on muscovite while arsenopyrite spectrum did not change significantly, which was consistent with flotation and zeta potential results. The selective adsorption of SP on muscovite compared to arsenopyrite was responsible for the effective separation of them.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 154951
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional three-component polymeric biocomposites for the treatment of bedsores
    Autorzy:
    Wiśniewska-Wrona, Maria
    El Fray, Mirosława
    Powiązania:
    https://bibliotekanauki.pl/articles/1034423.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    Chitosan
    FTIR
    NMR
    alginate
    carboxymethyl cellulose
    dressing DSC
    Opis:
    Presented here are the results of investigations into the preparation of three-component dressing materials from various biopolymers in the form of a single-layer film which is suitable as a carrier for pain-relieving (lidocaine) and bacteriostatic (sulphanilamid) therapeutic agents. Physical-chemical, biological and usable properties of the prepared materials were tested and assessed. The amount of added active substance was adopted based on the dose recommended by the Polish Pharmacopeia for external medicinal preparations. Antibacterial activity against gram (-) Escherichia coli and gram (+) Staphylococcus aureus was assessed in some of the biocomposites by quantitative methods. The cytotoxic action in direct contact with the mouse fibroblast NCTC clone 929 was also estimated. Thermal analysis (DSC), infrared spectrophotometry (FTIR) and nuclear magnetic resonance spectroscopy were employed to investigate the impact of the variable contents of chitosan, alginate, carboxymethyl cellulose (CMC), and the active substance upon the chemical- and phase-structure of the prepared three-component polymeric biocomposites. It was found that the quantitative composition of the biocomposites and the additive of active substances lidocaine and sulphanilamide exert a vital impact upon their physical-mechanical and usable properties (imbibition, absorption). Investigations into the release of the medicinal substance from the investigated biocomposites to an acceptor fluid led to the conclusion that the kinetics of the process may be described by a complex first order rate equation with two exponential functions.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 185-206
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation separation of cassiterite and chlorite using carboxymethyl cellulose as a depressant
    Autorzy:
    Hu, Yang
    Ying, Luo Hong
    Zhang, Ying
    Wei, Lu Kuan
    Hao, Guan Zhen
    Powiązania:
    https://bibliotekanauki.pl/articles/2175422.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cassiterite
    chlorite
    sodium oleate
    carboxymethyl cellulose
    selective inhibition
    Opis:
    The nature and mechanism of interaction between carboxymethyl cellulose (CMC) with cassiterite (and chlorite surfaces) and their effects on the flotation separation process of cassiterite (from chlorite) were investigated by micro-flotation tests, surface adsorption experiments, zeta potential measurements, solution chemical calculation, infrared spectroscopy, and X-ray photo-electron spectroscopy (XPS). The results from single mineral tests revealed that CMC exhibited good selective inhibition effects with cassiterites and chlorites. When the dosage was 12.5 mg/L at pH 8, cassiterite and chlorite recovery was 92.2% and 6.3%, respectively. The artificial mixed ore test revealed that the flotation separation effect was the best when the dosage of CMC was 6.5 mg/L. Cassiterite used during the studies was 75.1% pure. The recovery was 82.8%. The interaction between CMC and the cassiterite surface led to a shift in the zeta potential toward the negative direction. CMC was weakly adsorbed on the cassiterite surface. There was no significant impact on the subsequent collection of sodium oleate. The concentration of C atom increased post interaction, and the potential shifted toward the negative direction. Characteristic CMC peaks were observed at this point. Hydrogen bonds and weak chemisorption interactions between CMC and chlorite affected the interaction between sodium oleate and the chlorite surface. It also affected the flotation results. The cassiterite and chlorite were separated effectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 155141
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Minimizing the explosion enthalpy of ammonium nitratewith polyethylene glycol and carboxymethyl celluloseto prevent terrorist attacks
    Autorzy:
    Gezerman, Ahmet Ozan
    Powiązania:
    https://bibliotekanauki.pl/articles/952687.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    carboxymethyl cellulose
    polyethylene glycol
    ammonium nitrate
    detonation
    karboksymetyloceluloza
    glikol polietylenowy
    azotan amonowy
    detonacja
    Opis:
    The use of ammonium nitrate due to its high nitrogen content (>26%) has made it the most utilizedfertilizer in agricultural areas. However, being easily accessible with this feature encouraged its use fordifferent purposes. Ammonium nitrate is usually produced with large tonnage (>50ton/h) and highcost (>$20million) production processes. Therefore, any changes that can be made in the processmust be applied in the process so that the result can be achieved easily without increasing the costin any way. In this study, it is aimed to reduce the explosion sensitivity of ammonium nitrate usedfor explosive purposes in terrorist attacks. Thus, it was aimed to solve the problem by adding variouschemicals to the ammonium nitrate production process so that it can only be used for agriculturalpurposes. For this purpose, the production process was examined by adding carboxymethyl celluloseand polyethylene glycol to the ammonium nitrate production process and the accuracy of the resultswas tested by instrumental analysis methods
    Źródło:
    Chemical and Process Engineering; 2020, 41, 3; 183-195
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isolation of Bacteria from Drill Cuttings, their Identification and Assessment of Destructive Potential
    Autorzy:
    Chernykh, Elena G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086394.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    anionic surfactant
    drill cuttings
    carboxymethyl cellulose
    diesel fuel
    surfactant
    cationic surfactant
    oil-based drilling fluid
    hydrocarbon-oxidizing microorganisms
    Opis:
    The drilling of any oil and gas well is accompanied by the use of drilling fluids consisting of chemical reagents and materials of varying degrees of environmental hazard. The existing drilling waste disposal technologies are expensive, energyand labor-intensive, and do not always contribute to the formation of environmentally friendly compounds. In this regard, the possibility of using destructor microorganisms capable of growing and exhibiting biochemical activity under the conditions of complex pollution, in an environment with a high content of hydrocarbons, surfactants and polymer additives capable of biodegrading these substances, is relevant. In connection with the foregoing, the search for new strains of bacteria for the disposal of drilling waste, which are resistant to the conditions of complex toxic effects of drill cuttings components and, at the same time, capable of providing a significant degree of detoxification of the reagents that are part of hydrocarbon-based solutions, is relevant.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 4; 155--163
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural modified starch and synthetic sizes in function of characteristics of sized yarn
    Wpływ naturalnie modyfikowanej skrobi i syntetycznej preparacji na charakterystyki przędz preparowanych
    Autorzy:
    Kovačević, S.
    Dorđević, S.
    Dorđević, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/233650.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    yarn
    natural modified starch
    synthetic sizes
    polyvinyl alcohol
    PVA
    carboxymethyl cellulose
    CMC
    physico-mechanical properties
    przędza
    skrobia naturalna
    skrobia modyfikowana
    rozmiar syntetyczny
    alkohol poliwinylowy
    karboksymetyloceluloza
    właściwości fizykomechaniczne
    Opis:
    The aim of this study was to investigate the changes in properties of yarn made by sizing with synthetic and natural modified corn starch. Different procedures for obtaining modified natural (corn) starch and various combinations of natural and synthetic sizes were used to explore the differences in the properties of sized yarn. The sizing process was carried out under with constant conditions in a newly developed laboratory sizing machine on twisted cotton yarns of 20×2 tex and 30×2 tex. According to the results obtained, yarn sized with synthetic sizes has substantially better properties than those which are naturally sized with modified starch. However, sometimes these differences are not significant or they do not exist at all. Twisted yarn is not always necessary in sizing in order to increased its strength but rather to protect the surface from wear and refine projecting fibers; in this case natural modified starch from corn can meet the requirements. The significance of this research is the application of natural sizes, improvement of the sizing process with natural modified sizes using new achievements in the development of the sizing process, and thus creating a positive environmental and economic impact.
    Celem pracy było zbadanie zmian właściwości przędz preparowanych preparacjami syntetycznymi i z naturalnie modyfikowanej skrobi. Proces nanoszenia preparacji przeprowadzono przy zachowaniu stałych warunków nowo zbudowanej laboratoryjnej maszynie. Obrabiano skręcane przędze bawełniane o masie liniowej 20 × 2 tex i 30 × 2 tex. Zgodnie z otrzymanymi wynikami przędze preparowane preparacją syntetyczną miały zdecydowanie lepsze parametry od przędz z preparacją opartą na modyfikowanej skrobi. Jednakże czasami różnice te nie determinują konieczności zastosowania preparacji syntetycznej zwłaszcza w sytuacji kiedy nie jest wymagane uzyskanie maksymalnej wytrzymałości a istotne są elementy ochrony środowiska i koszty produkcji.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 1 (115); 56-66
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Poszukiwanie prostych modeli do badania adhezji bakterii probiotycznych
    Searching for simple models to study the adhesion of probiotic bacteria
    Autorzy:
    Czaczyk, K
    Olejnik, A
    Miezal, P
    Grajek, W
    Powiązania:
    https://bibliotekanauki.pl/articles/828476.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Technologów Żywności
    Tematy:
    bakterie probiotyczne
    adhezja bakterii
    Lactobacillus casei
    Lactobacillus acidophilus
    Lactobacillus rhamnosus
    metody badan
    alginiany
    karageny
    kolagen
    karboksymetyloceluloza
    zdolnosci adhezyjne
    probiotic bacteria
    bacterial adhesion
    test method
    alginate
    carrageenan
    carboxymethyl cellulose
    adhesive ability
    Opis:
    Przeprowadzono studia porównawcze nad możliwością zastąpienia w badaniach adhezji bakterii mlekowych modelu kultury komórek nabłonka jelitowego innymi uproszczonymi modelami. Badano przyczepność bakterii probiotycznych Lactobacillus casei Shirota ATCC 39539, Lactobacillus acidophilus LC1 oraz Lactobacillus rhamnosus GG ATCC 53103 do membran wykonanych z alginianu, karagenu, żelatyny, kolagenu, szkła, polistyrenu i karboksymetylocelulozy. Zaobserwowano największy stopień przyczepności bakterii probiotycznych do membran wykonanych z karboksymetylocelulozy i kolagenu. W większości wariantów doświadczeń liczba przyczepionych komórek bakteryjnych wzrastała wraz ze wzrostem czasu ich kontaktu z powierzchnią stałą. Wykazano także różnice w przyczepności komórek do hydrożeli o różnych stężeniach. Na podstawie przeprowadzonych badań można stwierdzić, że stopień adhezji bakterii probiotycznych do różnych powierzchni organicznych i nieorganicznych jest cechą zaleną od szczepu mikroorganizmu. Żaden z prostych modeli adhezyjnych, zastosowanych w tej pracy, nie charakteryzował się adhezyjnością porównywalną z komórkami nabłonka jelitowego Caco-2 i HT-29, stosowanego obecnie jako główny model in vitro do badań adhezji bakterii probiotycznych.
    Comparative studies were performed on the possibility of replacing intestinal epithelial cells by some other simplified models for the purpose of examining the adhesion of probiotic bacteria. The adhesion of Lactobacillus casei Shirota ATCC 39539, Lactobacillus acidophilus LC1, and Lactobacillus rhamnosus GG ATCC 53103 to surfaces of alginate, carrageenan, gelatin, collagen, glass, polystyrene, carboxymethylcellulose, and to intestinal epithelial cells (Caco-2 and HT-29 lines) were tested. Among the examined solid surfaces, the highest degree of adhesion was observed in the case of carboxymethylcellulose and collagen. In the majority of experimental variants, the number of bacterial cells adhering to surfaces increased parallel to the time of their contacting a solid surface. Additionally, there were stated differences in the cell adhesion to hydrogels showing varying concentration rates. On the basis of the experiments performed, it is possible to state that the adhesion degree of probiotic bacteria to various inorganic and organic surfaces is a parameter that depends on the strain of a microorganism. Among all the simplified models applied in the studies in question, no one was marked by an adhesion rate comparable to the adhesion of intestinal epithelial cells Caco-2 and HT-29, which are, nowadays, used as a major model in vitro while investigating the adhesion of probiotic bacteria.
    Źródło:
    Żywność Nauka Technologia Jakość; 2005, 12, 1; 84-96
    1425-6959
    Pojawia się w:
    Żywność Nauka Technologia Jakość
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies