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    Wyświetlanie 1-7 z 7
    Tytuł:
    Investigation of mechanical and physicochemical properties of clinically retrieved titanium-niobium orthodontic archwires
    Autorzy:
    Stoyanova-Ivanova, Angelina
    Cherneva, Sabina
    Petrunov, Vladimir
    Petrova, Violeta
    Ilievska, Ivana
    Mikli, Valdek
    Iankov, Roumen
    Powiązania:
    https://bibliotekanauki.pl/articles/306480.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    właściwości mechaniczne
    morfologia
    struktura
    skład chemiczny
    Ni-free orthodontic wires
    titanium-niobium
    mechanical properties
    morphology
    chemical composition
    structure
    Opis:
    Most of the orthodontic archwires used in the clinical practice nowadays contain nickel (Ni), however, many patients, especially kids, are allergic to Ni. One possible Ni-free alternative is the Titanium-Niobium (Ti-Nb) archwire. Unfortunately, there is not enough information about its mechanical properties in the literature, especially after clinical usage. Therefore, the aim of this work was to investigate and compare the mechanical properties, chemical composition, structure and morphology of as received and used in clinical practice Ti-Nb orthodontic archwires. Materials and methods: We investigated and compared as received and clinically retrieved after 4 and 6 weeks respectively Ti-Nb archwires with dimensions 0.43 × 0.64 mm (0.017 in. × 0.025 in.). The following methods were used: instrumented indentation testing (nanoindentation), X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Results: The nanoindentation investigations of as received and used Ti-Nb archwires revealed a decreasing in their indentation hardness with increased periods of use in the patient’s mouth. Moreover, an increasing of the concentration of Ti in the content of the TiNb alloy was associated with an increased period of use in the oral cavity. The SEM analysis showed changes in surface morphology with increasing the period of use of the archwires. Conclusions: The results showed that there are slight changes in the mechanical and physicochemical properties of the investigated wires after their use in the patient’s mouth. That is why we do not recommend them for recycling.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2020, 22, 1; 31-39
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Sterilization and Exposure to the Ringers Solution on Mechanical and Physicochemical Properties of Nitrocarburized 316 LVM Steel
    Autorzy:
    Kajzer, A.
    Rabij, K.
    Basiaga, M.
    Nowińska, K.
    Kaczmarek, M.
    Borowski, T.
    Wierzchoń, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/356523.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AISI 316LVM steel
    nitrocarburizing process
    mechanical properties
    physico-chemical properties
    Opis:
    Studies on biocompatibility of AISI 316LVM steel indicate the need to eliminate the nickel from the surface and replace it with other elements of improved biocompatibility. Therefore, in the presented work selected physicochemical and mechanical properties of the diffusive nitrocarburized layer formed by plasma potential by means of an active screen made of the Fe-Cr-Ni were studied. In the paper we present results of microstructure and phase composition of the layers, roughness, and surface wettability, potentiodynamic pitting corrosion resistance, penetration of ions into the solution as well as mechanical properties. The studies were conducted for the samples of both mechanically polished and nitrocarburized surfaces, after sterilization, and exposure to the Ringer’s solution. Deposition of the nitrocarburized layer increased the contact angle, surface roughness, surface hardness, and corrosion resistance with respect to the polished surfaces. The nitrocarburized layer is a barrier against the ions release into the solution and sterilization and exposure to Ringer solution. The obtained results showed beneficial increase of both mechanical and electrochemical properties of the deposited layer, and thus the applicability of the proposed method of surface treatment of the 316 LVM steel for short-term implants after sterylization.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1257-1266
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary studies of the influence of starch irradiation on physicochemical properties of films prepared using starch and starch-surfactant systems
    Autorzy:
    Cieśla, K. A.
    Nowicki, A.
    Buczkowski, M. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148406.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    starch films
    starch-surfactants films
    gamma irradiation
    mechanical properties
    barrier properties
    hydrophobic
    Opis:
    The influence was studied of potato and wheat starch irradiation on physicochemical properties of films, prepared using either starch alone or a composition of potato starch with three surfactants: sodium laurate, sodium palmitate and cetyl-trimethyl-ammonium bromide (CTAB). The surfactants were introduced at a level of 0.038 division sign 0.075 g per 1 g of starch. This corresponds to 0.136–0.222 mmol/g, depending on the surfactant type and its amount used. Irradiations were carried out using 60Co radiation with doses of 5, 10, 20 and 30 kGy. Films were prepared with addition of glycerol (0, 20 or 30% in terms of starch mass) by means of casting from the gelatinized starch or starch-surfactant solutions. With the purpose to characterize the films, mechanical tests (using an Instron instrument) and the wetting angle measurements were performed. The effect was determined of the storage and conditioning in an atmosphere characterized by the various moisture content on the properties of films with various compositions. The results show the radiation-induced improvement of hydrophobic properties of the films prepared using potato and wheat starch, and the selected potato starch-surfactant compositions. Improvement of strength and flexibility was obtained in the case of potato starch films, while in the case of wheat starch films the increase of strength was accompanied by a decrease in flexibility. Improvement of the functional properties of potato starch films corresponds to the improvement of their structural properties, found by scanning electron microscopy (SEM). The possibilities of modification of the films properties by modification of composition and radiation treatment were discussed.
    Źródło:
    Nukleonika; 2010, 55, 2; 233-242
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of ionizing radiation on the properties of starch-PVA films
    Autorzy:
    Abramowska, A.
    Cieśla, K. A.
    Buczkowski, M. J.
    Nowicki, A.
    Głuszewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/147450.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    starch
    poly(vinyl alcohol)
    films
    ionizing radiation
    mechanical properties
    physicochemical properties
    Opis:
    The cornstarch: poly(vinyl alcohol) (PVA) films characterized by the alternating ratio of starch:PVA (100:0, 80:20, 60:40, 40:60, 20:80, and 0:100) and containing 30% of glycerol were prepared by solution casting. The films were irradiated with an absorbed dose of 25 kGy with gamma rays in a vacuum and with fast electrons in the air. The films characterized by a high content of starch appeared stiff, while the films characterized by a high content of PVA were highly flexible. The tensile strength and flexibility, as well as swelling and hydrophilicity, increased with the increase in the PVA content in the films. However, the tensile strength and wetting angle values achieved a minimum at an intermediate composition. It was found that irradiation enables to reduce hydrophilicity of the films accompanied by a decrease in their flexibility. No general conclusion concerning the effect of irradiation on tensile strength and swelling behavior can be derived. An increase in the homogeneity of the films and an increase in the compatibility of their components was found by scanning electron microscopy (SEM). Strong interactions of the starch and the PVA components were discovered by diffuse reflectance spectroscopy. Degradation was found to be the prevailing process occurring in the films under the infl uence of irradiation. The possible accompanying crosslinking is discussed in terms of the gel content in the samples. Creation of various oxidation products in the films characterized by the modified composition was observed under the influence of irradiation carried out in the air. Basing on the obtained results it can be supposed that the selected starch-PVA compositions might appear useful as packagings of the products predicted for radiation decontamination.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 669-677
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemical and mechanical properties of Crofer 22 APU ferritic steel applied in SOFC interconnects
    Właściwości fizykochemiczne i mechaniczne stali ferrytycznej Crofer 22 APU na interkonektory ogniw paliwowych SOFC
    Autorzy:
    Stygar, M.
    Kurtyka, P.
    Brylewski, T.
    Tejchman, W.
    Staśko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/264094.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    solid oxide fuel cell
    metallic interconnect
    mechanical properties
    cyclic oxidation
    microstructure
    ogniwo paliwowe
    właściwości mechaniczne
    utlenianie
    mikrostruktura
    Opis:
    The paper presents the results of investigations of the physicochemical and mechanical properties of the Crofer 22 APU steel designed for application in metallic interconnects forming the key components of solid oxide fuel cells (SOFCs). Microstructural and hardness studies of non-metallic inclusions and the matrix were carried out. Based on compression tests of raw Crofer 22 APU and the steel after 600 hrs of cyclic oxidation in air at 800°C, the composition of non-metallic inclusions and their influence on the strength properties of the steel were determined.
    W pracy przedstawiono wyniki badań właściwości fizyko-chemicznych i mechanicznych stali Crofer 22 APU dedykowanego do zastosowań na interkonektory metaliczne będących kluczowym elementem ogniw paliwowych SOFC. Przeprowadzono badania mikrostruktury oraz twardości wydzieleń niemetalicznych i osnowy. Na podstawie testów ściskania stali wyjściowej oraz stali poddanej cyklicznemu utlenianiu przez 600 h w powietrzu w 800°C określono skład wytrąceń niemetalicznych oraz wykazano ich wpływ na parametry wytrzymałościowe stali.
    Źródło:
    Metallurgy and Foundry Engineering; 2013, 39, 2; s. 47-57
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of halloysite on the physicochemical, mechanical and biological properties of polyurethane- -based nanocomposites
    Wpływ dodatku haloizytu na fizykochemiczne, mechaniczne i biologiczne właściwości nanokompozytów na osnowie termoplastycznego poliuretanu
    Autorzy:
    Mrówka, Maciej
    Szymiczek, Małgorzata
    Machoczek, Tomasz
    Lenża, Joanna
    Matusik, Jakub
    Sakiewicz, Piotr
    Skonieczna, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/947427.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    nanocomposites
    thermoplastic polyurethanes
    halloysite
    mechanical properties
    cytotoxicity
    tests
    degradation
    nanokompozyty
    termoplastyczne poliuretany
    haloizyt
    właściwości mechaniczne
    badania cytotoksyczne
    degradacja
    Opis:
    The impact of the addition of the nanofiller – halloysite – on the mechanical, physicochemical and biological properties of a nanocomposite, in which thermoplastic polyurethane fulfilled the role of the matrix was investigated. The nanocomposite was obtained by extrusion in three variants with 1, 2 and 3 wt % halloysite. The nanostructure of the obtained materials was confirmed using Atomic Force Microscopy (AFM). Based on the mechanical tests carried out, it was proven that the obtained nanocomposites were characterized by a tensile modulus greater than the polyurethane constituting the matrix. The density and hardness of the nanocomposites had changed within error limits compared to unmodified polyurethane. Biological tests showed no cytotoxicity of all the tested materials to normal human dermal fibroblasts (NHDF). Degradation tests were carried out in artificial plasma and showed that samples with 2 wt % halloysite addition had the best ratio of tensile strength and elongation at break to elasticity modulus.
    Zbadano wpływ naturalnego nanonapełniacza – haloizytu – na właściwości mechaniczne, fizykochemiczne oraz biologiczne kompozytu wytworzonego na bazie termoplastycznego poliuretanu. Nanokompozyt o zawartości 1, 2 i 3% mas. haloizytu otrzymywano na drodze wytłaczania. Nanostrukturę wytworzonych materiałów potwierdzono za pomocą mikroskopii sił atomowych (AFM). Na podstawie przeprowadzonych badań mechanicznych wykazano, że uzyskane nanokompozyty charakteryzują się modułem sprężystości większym niż poliuretan stanowiący osnowę. Zmiany gęstości i twardości niemodyfikowanego poliuretanu po dodaniu haloizytu mieściły się w granicach błędu pomiaru. Testy biologiczne nie wykazały cytotoksyczności wszystkich badanych materiałów wobec prawidłowych fibroblastów ludzkiej skóry (NHDF). Badania degradacji przeprowadzone w środowisku syntetycznego osocza wykazały, że próbki z dodatkiem 2% mas. haloizytu mają najlepszy stosunek wytrzymałości na rozciąganie i wydłużenia przy zerwaniu do modułu sprężystości.
    Źródło:
    Polimery; 2020, 65, 11-12; 784-791
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Simulations on Physicochemical Performance of Novel High-energy BHDBT-based Propellants
    Autorzy:
    Wang, Ke
    Huang, Hai-tao
    Xu, Hui-xiang
    Li, Huan
    Li, Jun-qiang
    Fan, Xue-zhong
    Pang, Wei-qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/27787879.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    molecular dynamic
    BHDBT
    migration
    mechanical properties
    safety
    Opis:
    Based on Energy Calculation Star program and molecular dynamic method, three designed 2,3-bis(hydroxymethyl)-2,3-dinitro-1,4-butanediol tetranitrate-based (BHDBT) propellants are firstly reported and their physicochemical performance are investigated. Results suggest that compared with HMX-based and CL-20-based propellants, the specific impulses of all BHDBT-based propellants surpass or approximate 280 s, which indicates the latter have the potential to be high-energy propellants. The diffusion coefficient of plasticizers in BHDBT-based propellant decrease as the temperature reduces, and reduce in the order: Bu-NENA > TMETN > BTTN. The densities of all BHDBT-based propellants surpass or approximate 1.7 g/cm3. The comparison of elastic constants, Poisson’s ratios and K/G values indicates that the mechanical properties of three BHDBT-based propellants increase in the order (by plasticizer): Bu-NENA < TMETN < BTTN. The bond length analysis of C–NO2 and O–NO2 bond in BHDBT suggests that the former is the trigger bond in the BHDBT-based propellants, and the safety of BHDBT-based propellants and BHDBT crystal decreases in the order: GAP/BTTN/Al/BHDBT > GAP/Bu-NENA/Al/BHDBT ≈ GAP/TMETN/Al/BHDBT > BHDBT. In conclusion, GAP/BTTN/Al/BHDBT propellant has the potential to be a novel high-energy propellant.
    Źródło:
    Central European Journal of Energetic Materials; 2021, 18, 1; 5--24
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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