Temat: carbon composites - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: An "in Vitro" study of polymer-based composites
Autorzy:: Konieczna, Bożena
Błażewicz, Marta
Czajkowska, Barbara
Opis:: Structures of most tissues in the human body can be simulated with fibrous composite materials. A major problem associated with designing biocompatible composites for reconstruction of damaged or missing tissues is the ability to mimic such structures. The physical, chemical and mechanical properties of composite materials should be similar to those of the native tissue. Another very important factor of polymer-based fibrous composite materials, which can relatively easily be modified, is their surface microstructure. This surface microstructure depends on the way of preparation, type of polymer matrix and kind of reinforcement. This work was aimed to determine the biological properties of composites obtained from carbon fibres and a polymer matrix, which can be used as biomaterial in the reconstruction of cartilage tissue. Two types of samples made from short carbon fibres and two kinds of polymers were tested. The samples were prepared by casting technique. MTT tests were carried out in the presence of hFOB-1.19-line human osteoblasts and HS-5-line human fibroblasts. The results show differences in viability of living cells. Results of the work show significant differences in biocompatibility of pure polymers and composites with short carbon fibres.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Preparation and Recycling of Carbon Containing Composites
Autorzy:: Zagórski, K.
Rusek, P.
Tematy:: carbon composites
machining
scrap recycling; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/99471.pdf Link otwiera się w nowym oknie
Opis:: Composites based on anthracite grains and carbon scrap containing also two mirror components were investigated. A milling machine allowing cutting speeds in the 100-400mm/min range connected to a piezoelectric dynamometer and a video camera was used. The debris formed was screened through sieves and chips with sizes larger than 1 mm can be recycled. Cutting resistance of the composite depends on the local distribution of the carbon scrap phase.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Inverse gas chromatographic characterization of halloysite-carbon composites as adsorbents for skin disinfectants from water solutions
Autorzy:: Słomkiewicz, Piotr
Szczepanik, Beata
Frydel, Laura
Włodarczyk-Makuła, Maria
Tematy:: inverse gas chromatography
halloysite-carbon composites
triclosan
chloroxylenol
chlorophene
adsorption; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59315744.pdf Link otwiera się w nowym oknie
Opis:: The influence of physicochemical parameters of halloysite-carbon composites on the adsorption of skin disinfectants was investigated. The dispersive surface free energy and acid-base properties of halloysite-carbon composites were determined using inverse gas chromatography. The free adsorption energy was higher for all halloysite-carbon composites compared to the unmodified halloysite, which acted as a less electron-donating adsorbent. In contrast, the composite obtained using halloysite nanotubes (HNT) and ground microcrystalline cellulose as the carbon precursor exhibited the highest free adsorption energy and the Kb/Ka ratio. These results suggest that the free adsorption energy can be an additional factor influencing the adsorption process. We demonstrated that the composite with the highest free adsorption energy is effective for removing triclosan, chloroxylenol and chlorophene from water. The acid-base properties of halloysite-carbon composites enhance the adsorption of these compounds due to their acidic character. The composite with the highest Kb/Ka ratio removes adsorbates from aqueous solutions with the greatest efficiency. Parameters such as free dispersion energy, electron-donating, or electron-accepting properties of the adsorbent help explain why these composites exhibit high adsorption capabilities.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Evaluating the Durability of SiC-Coated Carbon Composites Under Thermal Shock Conditions
Autorzy:: Lee, Ji Eun
Bae, Soo Bin
Cho, Nam Choon
Lee, Hyung Ik
Meng, Zicheng
Lee, Kee Sung
Tematy:: durability
carbon composites
silicon carbide coating
chemical vapor deposition
chemical vapor reaction; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2049309.pdf Link otwiera się w nowym oknie
Opis:: Oxidation and indentation properties of silicon carbide-coated carbon composites were investigated to analyze its durability under atmospheric thermal shock conditions. The silicon carbide-coated samples were prepared either with chemical vapor deposition or chemical vapor reaction/chemical vapor deposition hybrid coating. The remnant weight of uncoated and coated samples was investigated after each thermal shock cycle. The surface and cross-section of coated samples were then analyzed to confirm morphological changes of the coating layers. The spherical indentation test for uncoated and coated samples were also performed. As a result, silicon carbide coating improved the oxidation resistance, elastic modulus, and hardness of carbon composites. Hybrid coating drastically enhanced the durability of samples at high temperature in atmospheric conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Maximising the potential of reactive carbon support with cobalt active phase for the oxygen evolution reaction
Autorzy:: Darvishzad, Termeh
Stelmachowski, Paweł
Opis:: A growing interest in novel noble metal-free electrocatalysts is fuelled by the pressing need to overcome the drastic demand for sustainable energy sources. To this end, the oxygen evolution reaction (OER) utilising transition metal oxide–carbon composites in alkaline media is considered a robust technology. In many such systems, carbon is used as a conductive additive or support, and the interactions between carbon support materials and the active phase affect the efficiency of the electrocatalyst. Cobalt forms some of the most active and stable electrocatalysts for OER. In carbon-supported systems, the dispersion of the cobalt phase on the carbon surface is a key factor in influencing the catalyst activity in water-splitting reactions. In this study, a low-temperature plasma treatment is used to boost the efficiency of the cobalt active phase by functionalising the carbon support with various oxygen groups. We used a simple deposition–precipitation method to obtain cobalt hydroxide active phase over graphene nanoparticles. The activation of graphene nanoparticles with oxygen plasma allowed us to obtain a catalyst that showed only 317 mV@10 $mA·cm^{−2}$. More importantly, in the series of plasma-activated samples, the OER activity was very high in a range of cobalt phase loadings, yielding a material with 2.4 wt.% of cobalt and an overpotential of only 327 mV@10 $mA·cm^{−2}$. The results indicate that plasma activation of GNP support maximises the usage of the transition metal active phase, which allows for an improvement in area-normalised and a dramatic improvement in the mass-normalised OER electrocatalytic activity.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 6.

Tytuł:: Investigation of the Accelerated Ageing of Carbon-Epoxy Composites on their Mechanical Properties
Autorzy:: Zielińska, Dorota
Kośla, Katarzyna
Kosińska, Ewelina
Chmal-Fudali, Edyta
Bereska, Bartłomiej
Helizanowicz, Barbara
Bednarowicz, Anna
Tematy:: accelerated ageing
carbon-epoxy composites
mechanical test
camouflage; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Powiązania:: https://bibliotekanauki.pl/articles/59115025.pdf Link otwiera się w nowym oknie
Opis:: In this work, carbon-epoxy composites obtained by an autoclave process were subjected to accelerated ageing in controlled conditions of temperature, water and UV radiation. Each composite was exposed to salt water at 60°C or UV radiation at 60°C over a period of 6 months. Changes within the composites were evaluated by mass and density variation, mechanical testing and also in terms of camouflage. Results did not show significant changes in mass loss or density, and it was found that mechanical properties had decreased slightly. The biggest change is in camouflage. It was observed that during accelerated ageing, the composites’ reemission coefficient becomes too high and composites lose camouflage properties.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Otrzymywanie i właściwości adsorpcyjne mezoporowatych węgli z nanocząstkami ditlenku tytanu
Synthesis and adsorption properties of mesoporous carbons with titania nanoparticles
Autorzy:: Choma, J.
Jaroniec, M.
Górka, J.
Jedynak, K.
Tematy:: kompozyty węglowe
mezoporowate kompozyty węglowe
nanocząstki ditlenku tytanu
metoda twardego i miękkiego odwzorowania
adsorpcja azotu
struktura porowata
carbon composites
mesoporous carbon composites with titania nanoparticles
hard and soft templating
nitrogen adsorption
porous structure; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/209835.pdf Link otwiera się w nowym oknie
Opis:: Opisano sposób otrzymywania mezoporowatych węgli i kompozytów węglowych z nanocząstkami ditlenku tytanu. Wykorzystano metodę twardego odwzorowania, w której stałą matrycą były nanocząstki koloidalnej krzemionki o wymiarach ok. 24 nm oraz metodę miękkiego odwzorowania, w której matrycą były cząsteczki kopolimeru trójblokowego politlenku etylenu - politlenku propylenu - politlenku etylenu EO101PO56EO101 Lutrol F127. W metodzie twardego odwzorowania prekursorem węglowym była żywica fenolowo-paraformaldehydowa, natomiast w metodzie miękkiego odwzorowania żywica rezorcynowo-formaldehydowa. Kompozyty węglowe z ditlenkiem tytanu zawierały 10 i 20% wag. TiO₂. Badano właściwości adsorpcyjne węgli i kompozytów węglowo-tytanowych za pomocą niskotemperaturowej adsorpcji azotu w celu wyznaczenia porowatości i pola powierzchni tych materiałów. Otrzymane mezoporowate węgle i kompozyty węglowo-tytanowe charakteryzowały się całkowitą powierzchnią właściwą zmieniającą się w przedziale od 1300 do 331 m²/g oraz całkowitą objętością porów, zmieniającą się w przedziale od 4,26 do 0,63 cm³/g. Stwierdzono, że 10 lub 20% wag. dodatek TiO₂ do mezoporowatych węgli powoduje zmniejszenie pola powierzchni właściwej oraz objętości porów w stosunku to analogicznych próbek nie posiadających nanocząstek ditlenku tytanu. Otrzymane materiały węglowe cechują się dużym udziałem mezoporowatości w całkowitej objętości porów zmieniającym się od 73 do 96%.
Synthesis of mesoporous carbons and carbon composites with titania nanoparticles is reported. The methods of hard and soft templating were employed using colloidal silica and poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) EO101PO56EO101, Lutrol F127 as hard and soft templates, respectively. Phenol and formaldehyde were used as carbon precursors in hard templating, while resorcinol and formaldehyde were used in soft templating. The carbon composites with titania nanoparticles contained 10 and 20wt.% of titania. Adsorption properties of carbons and titania-carbon composites such as porosity and surface area were determined from low temperature nitrogen adsorption isotherms. The resulting carbons and titania-carbon composites were characterized by specific surface area ranging from 1300 to 331 m²/g and total pore volume ranging from 4.26 to 0.63 cm³/g. It is shown that the addition of 10 and 20 wt.% of titania into mesoporous carbons caused reduction of the surface area and pores volume in comparison to analogous samples without titania nanoparticles. Also, the materials studied featured a high contribution of mesopores in the total pore volume ranging from 73 to 96%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Investigation of the Accelerated Ageing of Carbon-Epoxy Composites on their Mechanical Properties
Autorzy:: Zielińska, Dorota
Kosińska, Ewelina
Helizanowicz, Barbara
Chmal-Fudali, Edyta
Kośla, Katarzyna
Bednarowicz, Anna
Bereska, Bartłomiej
Wydawca:: Sciendo
Cytata wydawnicza:: Zielińska, D., Kośla, K., Kosińska, E., Chmal-Fudali, E., Bereska, B., Helizanowicz, B. & Bednarowicz, A. Investigation of the Accelerated Ageing of Carbon-Epoxy Composites on their Mechanical Properties. Fibres & Textiles in Eastern Europe, 2023, Sciendo, vol. 31 no. 6, pp. 73-80. https://doi.org/10.2478/ftee-2023-0057
Opis:: This research was funded by the NATIONAL CENTRE FOR RESEARCH AND DEVELOPMENT as part of the Programme: Defence and Security of the Country, grant number “DOB-1P/02/19/2016.”
In this work, carbon-epoxy composites obtained by an autoclave process were subjected to accelerated ageing in controlled conditions of temperature, water and UV radiation. Each composite was exposed to salt water at 60°C or UV radiation at 60°C over a period of 6 months. Changes within the composites were evaluated by mass and density variation, mechanical testing and also in terms of camouflage. Results did not show significant changes in mass loss or density, and it was found that mechanical properties had decreased slightly. The biggest change is in camouflage. It was observed that during accelerated ageing, the composites’ reemission coefficient becomes too high and composites lose camouflage properties.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 9.

Tytuł:: Influence of temperature changes on stresses in carbon composite fastening bolts
Wpływ zmian temperatury na naprężenia w śrubach łączących kompozyty węglowe
Autorzy:: Arkuszyńska, Angelika
Godzimirski, Jan
Rośkowicz, Marek
Tematy:: carbon composites
mechanical fasteners
thermophysical properties
thermal interactions
kompozyty węglowe
łączniki mechaniczne
właściwości termofizyczne
oddziaływania termiczne; Pokaż więcej
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/58908331.pdf Link otwiera się w nowym oknie
Opis:: High joint strength of composite structures can be achieved by using mechanical fasteners. The materials used for rivets and bolts have lower coefficients of thermal expansion than composites in the direction perpendicular to the reinforcement fibers. It is suspected, therefore, that temperature changes can cause stress changes in mechanical fasteners. The purpose of this study was to experimentally determine and analytically substantiate the values of stress changes resulting from a change in temperature in the range from -20 to 60C in M8 steel bolts fastening carbon composite. The value of stress changes was estimated to be around 100 MPa, which can consequently lead to joint unsealing or plastic deformation of the mechanical fastener.
Wysoka wytrzymałość połączeń struktur kompozytowych może zostać osiągnięta dzięki zastosowaniu łączników mechanicznych. Materiały wykorzystywane do produkcji nitów oraz śrub cechują mniejsze wartości współczynników rozszerzalności cieplnej niż kompozytów w kierunku prostopadłym do włókien zbrojenia. Podejrzewa się więc, że zmiany temperatury mogą powodować zmiany naprężeń w łącznikach mechanicznych. Celem przeprowadzonych badań było eksperymentalne określenie i analityczne uzasadnienie wartości zmian naprężeń wynikających ze zmiany temperatury w zakresie od -20 do 60C w stalowych śrubach M8 łączących kompozyt węglowy. Wartość zmian naprężeń oszacowano na około 100 MPa, co w konsekwencji może prowadzić do rozszczelnienia połączenia lub plastycznych odkształceń łącznika mechanicznego.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Synthesis of new carbon-nitrogen composites based on waste sweet drinks
Autorzy:: Kaźmierczak-Raźna, Justyna
Pietrzak, Robert
Nowicki, Piotr
Tematy:: carbon-nitrogen composites
waste sweet drinks
activated carbon
physical activation
physico-chemical properties; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110875.pdf Link otwiera się w nowym oknie
Opis:: The materials under investigation were new carbon-nitrogen composites obtained via pyrolysis and CO₂ activation of sweet drinks destined for utilization. Waste Pepsi Cola® has been examined as an alternative and renewable carbon source for composite materials. Nitrogen was introduced into the Pepsi Cola® solution via the addition of guanidine carbonate, before the pyrolysis process. The physicochemical properties of the materials studied were characterized by low- temperature nitrogen adsorption (using BET and BJH methods), elemental analysis, FTIR spectroscopy, scanning electron microscopy (SEM) as well as determination of pH_PZC and the number of surface functional groups. Additionally, thermal properties of the samples were investigated by thermogravimetric analysis (TG) and differential thermogravimetry (DTG). The final products were new carbon-nitrogen composites characterized by a very high content of nitrogen (11.2 - 21.6 wt.%) as well as relatively low surface area and pore volume reaching 198 m²/g and 0.16 cm³/g, respectively. Results of FT-IR study and Boehm titration indicated that the composites surface has clearly basic character, which was confirmed by pH_pzc values above 8.0.
Dostawca treści:: Biblioteka Nauki

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