Temat: MWCNT - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Zastosowanie membran MWCNT/PAN do usuwania metali ciężkich
Application of MWCNT/PAN membranes for heavy metals removal
Autorzy:: Przywara, Lucyna
Tematy:: composite membranes MWCNT/PAN
heavy metals
ultrafiltration
membrany kompozytowe MWCNT/PAN
metale ciężkie
ultrafiltracja; Pokaż więcej
Wydawca:: Akademia Techniczno-Humanistyczna w Bielsku-Białej
Powiązania:: https://bibliotekanauki.pl/articles/2064440.pdf Link otwiera się w nowym oknie
Opis:: The paper presents results of research on the production, properties and application of polyacrylonitrile (PAN) based membranes with the addition of multi-wallet carbon nanotubes (MWCNT) for the removal of heavy metals such as lead, zinc, cobalt and nickel from water and wastewater. The introduction of the MWCNT additive into the PAN matrix slowed down the membrane coagulation process, which resulted in an increase in their mass per unit area, thickness, apparent density and porosity, pore size of the membranes and improved the transport and separation properties. PAN membranes were obtained using phase inversion method. First, a 12% solution of PAN in DMF was prepared. Membrane-forming solutions containing 0.1, 0.5, and 1.0% of MWCNT respectively were prepared to form MWCNT/PAN composite membranes. Of all the composite membranes MWCNT/PAN obtained, the membrane “1” was characterized by the best properties. The pure water flux through membrane “1” was 9-12 fold higher than in the unmodified membrane (“0”). Performing structural tests enabled to explain phenomena observed during physicochemical properties tests. When analyzing the SEM photomicrographs (cross-section, bottom layer), it can be reported that the best structural is characterized by membrane “1”. The satisfactory results of transport membrane research encouraged to analyze the separation properties of composite membranes MWCNT/PAN. In order to test the separation properties, water with individual ions and ions in the electroplating wastewater was analyzed in terms of the use of the membranes for heavy metals removal. The examination of water individual ions was determined by atomic absorption spectrometry showed that only Zn2+ and Co2+ ions were completely removed (100%) on each of the membranes obtained in the experiment. The degree of heavy metals removal for all the obtained membranes and for subsequent ions was estimated at: 100% (Co2+), 70-100% (Zn2+), 65-100% (Ni2+) and 62-100% (Pb2+) for water and wastewater. The yielded results may indicate the occurrence of competitive reactions leading to preferential removal of metals from the electroplating wastewater.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Detection of NADH and ethanol at a graphite electrode modified with titania sol-gel/Meldola’s Blue/MWCNT/Nafion nanocomposite film
Autorzy:: Adamski, Juliusz
Kochana, Jolanta
Opis:: For electrocatalytic determination of NADH, a graphite electrode modified with titania sol-gel/Meldola's Blue/MWCNT/Nafion nanocomposite was proposed. The composition of the matrix film was optimised in terms of the content of carbon nanotubes and Nafion. Incorporation of a redox mediator, Meldola's Blue, into the nanocomposite film enabled electrocatalytic determination of NADH at a low potential, -50 mV. For determination of ethanol, alcohol dehydrogenase (ADH) was immobilized into the matrix layer. Experimental conditions affecting the biosensor response were examined, including enzyme loading, temperature of measurement and pH of background electrolyte. Assessments of the analytical characteristics of the biosensor were performed with respect to sensitivity, limit of detection, operational stability, repeatability and reproducibility. The proposed biosensor showed electrocatalytic activity toward oxidation of ethanol with sensitivity of 2.24 $\mu$A L mmol$^{-1}$, linear range from 0.05 to 1.1 mmol L$^{-1}$, and limit of detection of 25 $\mu$mol L$^{-1}$. The apparent Michaelis-Menten constant was 1.24 mmol L$^{-1}$, indicating a high biological affinity of ADH/titania sol-gel/Meldola's Blue/MWCNT/Nafion electrode for ethanol. The developed biosensor was tested in determinations of ethanol content in alcoholic beverages.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Optimization of process parameters for enhanced mechanical properties of polypropylene ternary nanocomposites
Autorzy:: Ogunleye, O O
Salawudeen, T O
Suleyman, M A
Faridah, Y
Tematy:: MWCNT
PPTN
tensile strength
Young's modulus; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102420.pdf Link otwiera się w nowym oknie
Opis:: Preparation of Polypropylene ternary nanocomposites (PPTN) was accomplished by blending multiwall carbon nanotube (MWCNT) in polypropylene/clay binary system using a melt intercalation method. The effects of MWCNT loadings (A), melting temperature (B) and mixing speed (C) were investigated and optimized using central composite design. The analysis of the fitted cubic model clearly indicated that A and B were the main factors influencing the tensile properties at a fixed value of C. However, the analysis of variance showed that the interactions between the process parameters, such as; AB, AC, AB2, A2B and ABC, were highly significant on both tensile strength and Young’s modulus enhancement, while no interaction is significant in all models considered for elongation. The established optimal conditions gave 0.17%, 165 °C, and 120 rpm for A, B and C, respectively. These conditions yielded a percentage increase of 57 and 63% for tensile strength and Young’s modulus respectively compared to the virgin Polypropylene used.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Synthesis of Copper-based Multi-walled Carbon Nanotube Composites
Autorzy:: Domagała, K.
Borlaf, M.
Kata, D.
Graule, T.
Tematy:: MWCNT
water treatment
copper
cuprous oxide
cupric oxide; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/355954.pdf Link otwiera się w nowym oknie
Opis:: In this study, the synthesis of copper-based multi-walled carbon nanotube compositesis described. Over the last years, carbon nanotubes (CNTs) have been widely used in many scientific research fields and have found applications in several sectors, e.g. for water treatment. This work focuses on combining the exceptional characteristics of CNTs, such as high specific surface areaand antibacterial properties, with the antimicrobial / antivirus features of copper oxides. The influence of synthesis parameters and thermal treatment on the final product was studied. Copper leakage was evaluated at both pH 5 and pH 7, confirming the possibility of applying Cu-based MWCNT composites in water filtration systems.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Vibration electrospinning of Polyamide-66/Multiwall Carbon Nanotube Nanocomposite: introducing electrically conductive, ultraviolet blocking and antibacterial properties
Autorzy:: Zohoori, S.
Latifi, M.
Davodiroknabadi, A.
Mirjalili, M.
Tematy:: MWCNT
PA66
Electrospinning
Electrical Conductivity
UV-Blocking
Antibacterial; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/949427.pdf Link otwiera się w nowym oknie
Opis:: Fabrication of electro-conductive fiber is a novel process. Nanocomposites of multiwall carbon nanotube/polyamide66 were produced by electrospinning with different amounts of multiwall carbon nanotube. Field emission scanning electron microscope and Fourier transform infrared spectroscopy of samples proved the existence of multiwall carbon nanotube distribution in polyamide 66 nanofibers. Results showed that electro conductivity of electrospun multiwall carbon nanotube/polyamide 66 nano fiber has increased in comparison with electrospun polyamide 66. Moreover, UV blocking of samples was investigated which has shown that using multiwall carbon nanotube in polyamide 66 increases UV blocking of fibers. Furthermore, anti-bacterial activity of nanocomposite showed that these nanocomposites have antibacterial property against both Staphylococcus Aureus and Escherichia Coli bacteria according to AATCC test method.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Application of Raman spectroscopy to study of the polymer foams modified in the volume and on the surface by carbon nanotubes
Autorzy:: Paciorek, Karolina
Wesełucha-Birczyńska, Aleksandra
Bajowska, Agata
Błażewicz, Marta
Długoń, Elżbieta
Frączek-Szczypta, Aneta
Kościelna, Aneta
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Measurement and evaluation of delamination factors and thrust force generation during drilling of multiwall carbon nanotube (MWCNT) modified polymer laminates
Autorzy:: Kumar, Kuldeep
Verma, Rajesh Kumar
Tematy:: drilling
glass fiber
MWCNT
delamination
thrust
wiercenie
włókno szklane
rozwarstwienie
pchnięcie; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2172773.pdf Link otwiera się w nowym oknie
Opis:: In recent years, manufacturing industries have demanded high-performance ma- terials for structural components development due to their reduced weight, improved strength, corrosion, and moisture resistance. The outstanding performance of polymer nano-composites substitutes the use of conventional composites materials. This study is concerned with the machining of MWCNT and glass fiber-modified epoxy com- posites prepared by a cost-effective hand layup procedure. The investigations were carried out to estimate the generation of the thrust force (Th) and delamination factors at entry (DFentry) and exit (DFexit) side during the drilling of fiber composites. The effect of varying constraints on the machining indices was explored for obtaining an adequate quality of hole created in the epoxy nano-composites. The outcome shows that the feed rate (F) is the most critical factor influencing delamination at both entry and exit side, and the second one is the thrust force followed by wt.% of MWCNT. The statistical study shows that optimal combination of S (1650 Level-2), F (165 Level-2), and 2 wt.% of MWCNT (Level-2) can be used to minimize DFentry, DFexit, and Th. The drilling-induced damages were studied by means of a high-resolution microscopy test. The results reveal that the supplement of MWCNT substantially increases the machining efficiency of the developed nano-composites.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: The homotopy perturbation method for electrically actuated microbeams in mems systems subjected to van der waals force and multiwalled carbon nanotubes
Autorzy:: Amir, Muhammad
Haider, Jamil Abbas
Ashraf, Asifa
Tematy:: microelectromechanical systems
Aboodh transform
homotopy method
amplitude-frequency relationship
MWCNT-MEMS; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/58907275.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a summary of a study that uses the Aboodh transformation and homotopy perturbation approach to analyze the behavior of electrically actuated microbeams in microelectromechanical systems that incorporate multiwalled carbon nanotubes and are subjected to the van der Waals force. All of the equations were transformed into linear form using the HPM approach. Electrically oper-ated microbeams, a popular structure in MEMS, are the subject of this work. Because of their interaction with a nearby surface, these mi-crobeams are sensitive to a variety of forces, such as the van der Waals force and body forces. MWCNTs are also incorporated into the MEMSs in this study because of their special mechanical, thermal, and electrical characteristics. The suggested method uses the HPM to model how electrically activated microbeams behave when MWCNTs and the van der Waals force are present. The nonlinear equations controlling the dynamics of the system can be roughly solved thanks to the HPM. The HPM offers a precise and effective way to analyze the microbeam's reaction to these outside stimuli by converting the nonlinear equations into linear forms. The study's findings shed im-portant light on how electrically activated microbeams behave in MEMSs. A more thorough examination of the system's performance is made possible with the addition of MWCNTs and the van der Waals force. With its ability to approximate solutions and characterize system behavior, the HPM is a potent instrument that improves comprehension of the physics at play and facilitates the design and optimization of MEMS devices. The aforementioned method's accuracy is verified by comparing it with published data that directly aligns with Anjum et al.'s findings. We have faith in this method's accuracy and its current application.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Preparation of nano membranes with triethylenetetramine dihydrochloride (TETA-DH) and multiwalled carbon nanotubes (MWCNT) for seawater desalination
Autorzy:: Alghamdi, Ahmed
Tematy:: multiwalled carbon nanotubes
MWCNT
triethylenetetramine dihydrochloride
TETA-DH
contact angle
foulant layer thickness; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/59124221.pdf Link otwiera się w nowym oknie
Opis:: Seawater Desalination uses hydrophobic membranes. Many techniques have been developed to improve membrane hydrophobicity by depositing particles on the membrane surface. In this study, a nanocomposite membrane utilizing Triethylenetetramine (TETA) is suggested. The membrane incorporates Multiwalled Carbon Nanotubes (MWCNT) in conjunction with Triethylenetetramine Dihydrochloride (TETA-DH). In water bath, different percentages of TETA-DH films are formed. Electro-spin fabrication of MWCNTs using TETA-DH yields smooth, low-pore membranes. Membranes and their characteristics are identified by contact angle, layer thickness, and conductivity measurements. Membrane performance is examined for heat flux and salt rejection. Compared to commercial membranes, the proposed membrane exhibits superior antifouling and anti-wetting features. The membrane exhibited permeation and rejection ratio of 46 Kg m2 h–1 and 99.99% respectively which is superior as compared with other membranes. The hydrophilic Surface Modifying Macromolecules percentage (LSMM%) is evaluated because it depends on average pore size, hydrophobicity, surface porosity, and shape. The tests demonstrate the excellent performance of the proposed membrane for controlling membrane fouling.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Enhancement photocatalytic activity of spinel oxide (Co, Ni)3O4 by combination with carbon nanotubes
Autorzy:: Kahdum, B. J.
Lafta, A. J.
Johdh, A. M.
Tematy:: MWCNT
spinel oxide
spinel/CNTs composite
Bismarck brown G degradation
photocatalytic activity; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/780087.pdf Link otwiera się w nowym oknie
Opis:: In this study, some types of composites consisting of multi-walled carbon nanotubes (MWCNTs) and spinel oxide (Co, Ni)₃ O₄ were synthesized by simple evaporation method. These composites were characterized by UV–Vis diffuse reflectance spectroscopy, X-rays diffraction(XRD), Scanning electron microscopy (SEM) and specific surface area(S_BET ). The photocatalytic activity of the prepared composites was investigated by the following removal of Bismarck brown G (BBG) dye from its aqueous solutions. The obtained results showed that using MWCNTs in combination with spinel oxide to produced composites (spinel/MWCNTs) which succeeded in increasing the activity of spinel oxide and exhibited higher photocatalytic activity than spinel oxide alone. Also it was found that, multiwalled carbon nanotubes were successful in increasing the adsorption and improving the activity of photocatalytic degradation of Bismarck brown G dye(BBG). The obtained results showed that spinel/MWCNTs was more active in dye removal in comparison with each of spinel oxide and MWCNTs alone under the same reaction conditions. Also band gap energies for the prepared composites showed lower values in comparison with neat spinel. This point represents a promising observation as these composites can be excited using a lower energy radiation sources.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Informacja

Wyszukujesz frazę "MWCNT" wg kryterium: Temat