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    Wyświetlanie 1-15 z 15
    Tytuł:
    Microstructural Characterization and Consolidation of Severely Deformed Copper Powder Reinforced with Multiwalled Carbon Nanotubes
    Autorzy:
    Akbarpour, M.
    Salahi, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400559.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Ni
    88.30.rh
    81.07.Bc
    64.70.fm
    Opis:
    In this paper, the mechanical milling process for various durations was used to generate a homogeneous distribution of 1 wt.% carbon nanotube within Cu powder. Effects of milling time on morphology, microstructure, and microhardness of the powder were studied. The results showed that work hardened Cu-carbon nanotube nanocomposite powder with nanosized grains can be fabricated by the mechanical milling of the elemental materials. The addition of carbon nanotubes accelerated the morphological and microstructural evolution during the mechanical milling and influenced the compressibility of the powder. The compressibility behavior of the powder was analyzed using analytical models and used to estimate the strength of the powder. The nanocomposite compacts were sintered in vacuum and showed the maximum relative density of ≈91% at optimum condition.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1722-1727
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Substrate Temperature on Structural Properties of Tin Oxide Films Produced by Plasma Oxidation after Thermal Evaporation
    Autorzy:
    Alaf, M.
    Guler, M.
    Gultekin, D.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399830.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.fm
    73.61.At
    81.16.Pr
    Opis:
    In this study, tin film was thermally evaporated onto a stainless steel substrate in an argon atmosphere. The tin films were then subjected to a DC plasma oxidation process using an oxygen/argon gas mixture. Three different substrate temperatures (100°C, 150°C, and 200°C) and three different oxygen partial pressures (12.5%, 25%, and 50%) were used to investigate the physical and microstructural properties of the films. The surface properties were studied by scanning electron microscopy, X-ray diffraction, atomic force microscopy and a four-point probe electrical resistivity measurement. The grain size and texture coefficient of the tin oxide films were calculated. Both SnO and $SnO_2$ films with grain sizes of 13-43 nm were produced, depending on the oxygen partial pressure. SnO films have flower- and flake-like nanostructures, and $SnO_2$ films have grape-like structures with nanograins. The resistivity values for the $SnO_2$ phase were found to be as low as $10^{-5}$ Ω cm and were observed to decrease with increasing substrate temperature.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 326-329
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Characterization of Interdigitated Humidity Sensors Based on CNT Modified Calixarene Molecules
    Autorzy:
    Özbek, C.
    Culcular, E.
    Okur, S.
    Yılmaz, M.
    Kurt, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400035.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    66.30.je
    65.40.gp
    65.40.gk
    65.40.gd
    64.70.fm
    64.10.+h
    51.10.+y
    Opis:
    In this study, we report on the optimization and characterization of chloroform soluble calix[4]arene derivative as a humidity sensor based on electrical properties. Due to the fact that calix[4]arene molecules are nonconductive, we modified the calix[4]arene molecules with carbon nanotubes with electrostatic bond in order to increase the conductance of calix[4]arene molecule (5,11,17,23-tetra-ter-butyl-25,27-dehydrazinamidcarbonilmetoxy-26,28-dehydroxy-kalix[4]aren). Using photolithography technique, we fabricated interdigitated gold electrodes with 3 micrometers separation to investigate the electrical properties of carbon nanotubes modified calix[4]arene molecule where we used dropcast method to form a thin film of carbon nanotubes modified calix[4]arene molecule on the gold electrodes. Our reproducible experimental results indicated that the chloroform soluble carbon nanotubes modified calix[4]arene films have great potential for humidity sensing applications at room temperature operations.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 461-463
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tin/Tinoxide $(Sn//SnO_2)$ Nanocomposites Thin Films as Negative-Electrode Materials for Li-Ion Batteries
    Autorzy:
    Alaf, M.
    Gultekin, D.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399828.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.fm
    73.61.At
    81.16.Pr
    82.47.Aa
    78.67.Sc
    Opis:
    In this study, tin/tinoxide $(Sn//SnO_2)$ nanocomposites thin films were produced by thermal evaporation and plasma oxidation as anode materials for Li-ion batteries. To produce $Sn//SnO_2$ thin films, pure metallic tin (Sn) was thermally evaporated on the stainless steel substrates in argon atmosphere. The Sn films were subjected to plasma oxidation process at oxygen/argon gas mixture. Three different plasma oxidation times (30, 45, and 60 min) were used to investigate oxidation kinetics and physical and microstructural properties. The surface properties were studied by scanning electron microscopy and atomic force microscopy. For structural analysis, X-ray diffraction measurements were carried out. $Sn//SnO_2$ coated stainless steel substrates were used as the working electrode in coin-type (CR2016) test cells. The energy storage capacity $Sn//SnO_2$ electrodes were determined depending on the oxidation time and $Sn:SnO_2$ ratio.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 323-325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Temperature on the Refractive Indices of Liquid Crystals and Validation of a Modified Four-Parameter Model
    Autorzy:
    Thingujam, K.
    Sarkar, S.
    Choudhury, B.
    Bhattacharjee, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418322.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.15.+e
    78.20.Fm
    64.70.M-
    Opis:
    The variation of refractive indices with temperature of three pure nematogenic compounds 5OCB, CPHB and 6CHBT were studied experimentally using thin prism technique. The refractive indices $n_{o}$ and $n_{e}$ were measured using 633 nm lines from a He-Ne laser. A modified four-parameter model was taken which is based on the Vuks equation describing the effect of temperature on the refractive indices of liquid crystals. In this paper we report the variation of refractive indices of these three liquid crystals with temperature, using the thin prism method. The variation in birefringence was determined experimentally. The variation in refractive indices and birefringence were also fitted theoretically using the modified Vuks equation. On comparison, the theoretically fitted values show close agreement with the experimental values.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 754-757
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaporation of Micro-Droplets: the "Radius-Square-Law" Revisited
    Autorzy:
    Jakubczyk, D.
    Kolwas, M.
    Derkachov, G.
    Kolwas, K.
    Zientara, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418268.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.F-
    64.70.fm
    68.03.Fg
    68.03.Hj
    05.70.Ln
    Opis:
    The range of applicability of a fundamental tool for studying the evolution of droplets, the "radius-square-law", was investigated both analytically and numerically, on the basis of the experimental results of our own as well as of other authors. Standard issues were briefly discussed. Departures from the "radius-square-law" caused by the influence of impurities encountered in non-ideal liquids, by the kinetic and surface tension effects encountered for small droplets or by thermal imbalance encountered in light-absorbing droplets were analysed. The entanglement between the kinetic and impurities effects was studied numerically yielding a possible explanation to evaporation coefficient discrepancies found in the literature. An unexpected "radius-square-law" persistence in case of non-isothermal evolutions of very small droplets in atmosphere nearly saturated with vapour was analysed. The coexistence of the kinetic effects and the strong effects of surface tension was found responsible for this effect.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 709-716
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gas Sensing Properties of Carbon Nanotubes Modified with Calixarene Molecules Measured by QCM Techniques
    Autorzy:
    Mermer, Ö.
    Okur, S.
    Sümer, F.
    Özbek, C.
    Sayın, S.
    Yılmaz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491414.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    66.30.je
    65.40.gp
    65.40.gk
    65.40.gd
    64.70.fm
    64.10.+h
    51.10.+y
    Opis:
    This study focuses on the characterization and optimization of calixarene modified carbon nanotube thin films for gas detection. Calixarene molecules were synthesized individually by considering their functional groups to attract the gas. Calixarene modified carbon nanotube based sensors were fabricated using drop-casting method on a quartz crystal microbalance gold electrode. Carbon monoxide, carbondioxide, oxygen and dry air were used as active gases for adsorption process, while high-purity nitrogen gas was used for desorption process. The selectivity and sensitivity of calixarene modified carbon nanotube are investigated in detail. Our experimental results show that functional calixarene modified carbon nanotube coated quartz crystal microbalance sensors are very sensitive and selective to gas of $CO_2$ at room temperature operation.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 240-242
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Odor Adsorption Kinetics on Modified Textile Materials Using Quartz Microbalance Technique
    Autorzy:
    Sarıışık, M.
    Okur, S.
    Asma, Ş.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491427.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    66.30.je
    65.40.gp
    65.40.gk
    65.40.gd
    64.70.fm
    64.10.+h
    51.10.+y
    Opis:
    In this study, a functional product with aromatic oil and vitamins for use at aromatherapy and spa centers or personal care has been designed to improve life quality of users by using multifunctional products with good odor, moisturizing, relaxation, anti-aging effects. For this purpose, commercial berry berry oil was capsulated in β-cyclodextrin, and then applied to 100% cotton towel fabric. Quartz crystal microbalance sensors were used to investigate odor adsorption kinetics on modified textile materials for the first time. The frequency responses vs. time plot shows clear linear step responses to the change in the concentration of odor molecules coming from the container filled with berry berry applied textile. The results also reveal that $TiO_2$ coated quartz crystal microbalance sensors can be used as e-nose to sense odor from textile coated with berry berry oil containing β-cyclodextrin capsules.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 243-246
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transitions in $[N(CH_3)_4]_2ZnCl_4$ and $[N(CH_3)_4]_2CuCl_4$ Crystals Related with the Incommensurate Modulation Existence
    Autorzy:
    Sveleba, S.
    Semotyuk, O.
    Katerynchuk, I.
    Kunyo, I.
    Karpa, I.
    Pankivskyi, Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812043.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.44.Fw
    64.70.Rh
    78.20.Fm
    65.40.Ba
    Opis:
    The continuous phase transitions are observed in the crystals with incommensurate phase. They are transitions of parent-incommensurate phases $(T_i)$; transitions between metastable states; incommensurate-commensurate phases $(T_c)$. It was set that phase transition between parent and incommensurate phase is a continuous second-order phase transition with a critical index β = 0.5. The transition between metastable states is a continuous phase transition through the intermediate temperature region - incommensurate phase. The wave vector changes with the temperature here and wave vectorwe q* = q₁ - q₂ appears, where q₁, q₂ denote commensurate values of incommensurability wave vector of neighboring metastable states. It was shown that the phase transition between incommensurate and commensurate phases is a continuous phase transition.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 791-806
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Stochastic Mode of the Modulated Structure in [N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{2}$MeCl$\text{}_{4}$ Dielectric Crystals
    Autorzy:
    Sveleba, S.
    Semotyuk, O.
    Katerynchuk, I.
    Furgala, Yu.
    Pankivskyi, Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046819.pdf
    Data publikacji:
    2006-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Lc
    61.44.Fw
    64.70.Rh
    78.20.Fm
    Opis:
    Temperature behavior of the optical birefringence in the transitional regions of the incommensurate phase of [N(CH$\text{}_{3}$)]CuCl$\text{}_{4}$ was studied. Temperature dependencies of the modulated structure wave vector and of the specific heat in these regions were analyzed. The stochastic mode of the incommensurate modulated structure in [N(CH$\text{}_{3}$)]MeCl$\text{}_{4}$ (Me = Cu, Fe) dielectric crystals was discovered.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 6; 695-700
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Dilatometric Properties of (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O Crystals in Paraelectric and Ferroelectric Phases
    Autorzy:
    Podsiadła, D.
    Czapla, Z.
    Andriyevsky, B.
    Myshchyshyn, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011078.pdf
    Data publikacji:
    1999-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    78.20.Fm
    Opis:
    Experimental investigation of the thermal linear expansion l(T) and temperature dependencies of the interference optical path difference D(T) were carried out for (CH$\text{}_{3}$)$\text{}_{2}$ NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O crystal, in the range of 120-310 K for three crystal physical directions. Decrease in electrostriction coefficients g of crystal was observed on approaching the phase transition point T$\text{}_{c}$ ≈ 150 K in ferroelectric phase. Relative temperature changes of the lengthening δl/l and refractive index δn/(n-1) are of the same order of magnitude. Peculiarities of temperature dependence of dilatometric and optical parameters of (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O testify for qualitative reconstruction of chemical bonds in the crystal when temperature changes in the same phase.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 3-4; 409-416
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Dilatometric Manifestations of Phase Transitions in K$\text{}_{2}$SeO$\text{}_{4}$ Crystal
    Autorzy:
    Andriyevsky, B.
    Myshchyshyn, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967887.pdf
    Data publikacji:
    1997-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Fm
    64.70.Kb
    Opis:
    Temperature dependencies of the characteristic optical paths difference D(Τ) of K2SeO4 crystal in the range of 80-295 K were measured using the Jamen type interferometer. Significant anomalies of D(Τ) dependencies in the vicinity of incommensurate-paraelectric phase transition (T$\text{}_{i}$ = 130 K) are observed. On the basis of D(Τ) temperature dependencies measured experimentally and linear expansion l(Τ) known, the temperature derivative of the refractive indices dn/dT are found to be negative in the ranges above and below the temperature T$\text{}_{i}$=130 K.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 3; 557-562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Investigations of Phase Transitions in (NH$\text{}_{4}$)$\text{}_{2}$SbF$\text{}_{5}$ Crystal
    Autorzy:
    Andriyevsky, B.
    Czapla, Z.
    Stadnyk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932114.pdf
    Data publikacji:
    1995-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    78.20.Fm
    Opis:
    Results of optical thickness and refractive indices measurements for (NH$\text{}_{4}$)$\text{}_{2}$SbF$\text{}_{5}$ crystal in the temperature range 100-310 K are presented. The measurements were done with interference method using He-Ne laser (λ = 632.8 nm). At T$\text{}_{c1}$ = 292 K and T$\text{}_{C2}$ = 168 K two continuous phase transitions with critical indices β$\text{}_{1}$ = 0.38 and β$\text{}_{2}$ ≤ 0.57 were observed. Additional anomaly of temperature changes of interference order with maximum at T$\text{}_{c3}$ ≈ 132 K were found. This anomaly resembles a diffused transition. Temperature-averaged values of derivatives of refractive indices dn$\text{}_{g}$ /dT = -3.3 × 10$\text{}^{-5}$ K and dn$\text{}_{m}$/dT = -2.9 × 10$\text{}^{-5}$ K$\text{}^{-1}$ evidenced a decrease in optical anisotropy (birefringence) along the b-axis on heating run.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 3; 611-617
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Birefringent and Dielectric Properties of [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$ZnBr$\text{}_{4}$ and [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$CdBr$\text{}_{4}$ Crystals
    Autorzy:
    Sveleba, S.
    Mokryi, V.
    Polovinko, I.
    Kapustyanik, V.
    Trybuła, Z.
    Petrenko, P.
    Kiosse, G.
    Kravtsov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929349.pdf
    Data publikacji:
    1993-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.22.Ch
    77.22.-d
    78.20.Fm
    64.70.-p
    Opis:
    Dielectric and birefringent properties of [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$ZnBr$\text{}_{4}$ and [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$CdBr$\text{}_{4}$ crystals were investigated. It has been ascertained that two phase transitions manifest themselves in the temperature dependencies є(T) for [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$CdBr$\text{}_{4}$ crystal - a second-order transition at T$\text{}_{1}$ = 311 K and a first-order one - at T$\text{}_{2}$ = 39 K (∆T$\text{}_{2}$ = 11 K). Besides two earlier known phase transitions in [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$ZnBr$\text{}_{4}$ at T$\text{}_{1}$ = 350 K and T$\text{}_{2}^{c\o\ol}$ = 282.8 K (∆T$\text{}_{2}$ ≈ 2.3 K), the additional one was found at T*$\text{}_{2}$ = 287.0 K, both on the cooling and heating runs. On the basis of the data about the peculiarities of dielectric and optical properties in the vicinity of T$\text{}_{2}$ one can made the conclusion about the ferroelectric character of the phase, situated between T*$\text{}_{2}$ and T$\text{}_{2}^{c\o\ol}$.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 6; 777-784
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Linear Birefringence Changes in Betaine Phosphite Crystal
    Autorzy:
    Kosturek, B.
    Przesławski, J.
    Czapla, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929341.pdf
    Data publikacji:
    1993-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    78.20.Fm
    Opis:
    Linear birefringence temperature changes are measured in the betaine phoshite crystal. The linear birefringence increments induced by antiferrodistortive, structural and ferroelectric phase transitions are analysed. Temperature derivatives of the linear birefringences are shown for comparison. Critical exponents are determined for both transitions. The antiferrodistortive phase transition is close to a tricritical one.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 6; 769-775
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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