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Wyświetlanie 1-15 z 133
Tytuł:
Role of Inertial Effects in Electron Transfer Kinetics
Autorzy:
Gajdek, P.
Powiązania:
https://bibliotekanauki.pl/articles/1945438.pdf
Data publikacji:
1996-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.-w
82.20.Pm
Opis:
The electron transfer rates at the steady state are evaluated in terms of the Gaussian wave packet motion on free energy curves in the two- and three-surface models in the presence of inertial effects. The autocorrelation functions of the solvent polarization coordinate are fitted to the results of recent molecular dynamics simulations. It is found that the inertial effects are particularly important for the electron transfer processes in acetonitrile and water. They constitute an impeding factor in the wave packet motion. The neglect of the inertial part of the solvent autocorrelation function gives underestimation of the electron transfer rate coefficient.
Źródło:
Acta Physica Polonica A; 1996, 89, 5-6; 727-734
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Kinetics of Spinel Formation of Algerian Halloysite by Differential Thermal Analysis
Autorzy:
Heraiz, M.
Sahnoune, F.
Belhouchet, H.
Raghdi, A.
Ouali, A.
Powiązania:
https://bibliotekanauki.pl/articles/1033398.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.70.Pg
81.20.Ev
82.20.-w
Opis:
The kinetics of spinel (Al-Si) crystallization from Algerian halloysite (DD1) was investigated using differential thermal analysis. Experiments were carried out on samples between room temperature and 1400°C with constant heating rate from 2 to 20°C min¯¹. The activation energies measured from isothermal and non-isothermal treatments were 1054.85 and 1140 kJ mol¯¹, respectively, for the spinel (Al-Si) formation. The Avrami constant n obtained by the Ligero method and the m parameter obtained by the Matusita method were about 2 for spinel crystallization. This value indicates that the crystallization mechanism of Al-Si spinel phase proceeds by bulk nucleation of the phase formation with a constant number of nuclei and that the three-dimensional growth of crystals is controlled by diffusion.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 139-142
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the Viscosity Behavior in the Interface Area of Two Miscible Liquids
Autorzy:
Szwajczak, E.
Stragaczyński, R.
Herba, H.
Świergiel, J.
Jadżyn, J.
Powiązania:
https://bibliotekanauki.pl/articles/1808026.pdf
Data publikacji:
2009-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.20.-w
66.20.Ej
83.85.Vb
Opis:
The paper presents the results of the share viscosity (η) investigations performed for binary mixtures composed of the liquids of extremely different viscosities: a high-viscous α-tocopherol acetate (η ≈ 10 Pa s) is mixed with 4-n-propylcyclohexyl-4'-n-pentylphenyl (η ≈ 10 mPa s) and mesitilene (η ≈ 1 mPa s), the two low-viscous solvents composed of the non-polar molecules of an essentially different shape. It was found that the viscosities of the mixtures, disregarding the molecular shape of the non-polar admixture, exhibit a strong nonlinear dependence on tocopherol mole fraction and, at a given temperature, the dependence can be described with an exponential function. For a constant tocopherol concentration in the mixtures, the viscosity temperature dependences are well described with the Vogel-Fulcher-Tammann relation. The results can be considered as a model of the viscosity behavior related to the laminar flow of miscible liquids of a different viscosity being in contact to each other.
Źródło:
Acta Physica Polonica A; 2009, 115, 5; 905-908
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Catalytic Properties of Ni-Fe Systems in the Reaction of CO₂ Methanation at Atmospheric Pressure
Autorzy:
Meshkini-Far, R.
Dyachenko, A.
Gaidai, S.
Bieda, O.
Filonenko, M.
Ischenko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1030898.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.30.Hk
82.30.-b
82.20.-w
Opis:
Catalytic activity, phase composition, and morphology of binary Ni-Fe metallic systems in CO₂ hydrogenation were investigated. High methane yield was detected in the region of high Ni content, except the sample with 75% of Ni which has shown a sharp drop in activity. By means of scanning electron microscopy-energy dispersive X-ray and X-ray diffraction methods the differences in surface structuring of active (Ni₈₀Fe₂₀) and inactive (Ni₇₅Fe₂₅) catalysts were revealed. High methane yield for the former might be explained by defective porous superficial layer of catalyst grains, whereby for the latter the specific surface is diminished due to sintering.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1088-1090
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Catalytic Properties of Co-Fe Systems in the Reaction of CO₂ Methanation
Autorzy:
Zhludenko, M.
Dyachenko, A.
Bieda, O.
Gaidai, S.
Filonenko, M.
Ischenko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1030910.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.30.Hk
82.30.-b
82.20.-w
Opis:
The properties of Fe-Co catalysts in the reaction of CO₂ hydrogenation were investigated. Samples with high cobalt concentrations have shown higher activity. Morphology of the obtained catalysts was observed by using scanning electron microscopy and the elemental composition of surface of the catalysts was determined by scanning electron microscopy-energy dispersive X-ray method. Energy dispersive X-ray analysis showed that metal distribution is not homogeneous with various metal ratio in selected points of the surface for the Fe-rich less active samples, whereas for the Co-rich samples with higher activity metals are homogeneously distributed, which is possibly connected to the formation of single phase.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1084-1087
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Olefin Hydrogenation with Single-Site Gold
Autorzy:
Szlachetko, J.
Lothschütz, C.
Sá, J.
Powiązania:
https://bibliotekanauki.pl/articles/1197714.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Dx
82.20.-w
82.80.Ej
Opis:
Butene hydrogenation activity is intimately connected with the occupied and unoccupied electronic states of gold active site. We prepare well-defined Au(III) sites in IRMOF-3 structure, and tuned the metal density-of-states by replacing the substituent group of the coordinating group at position 5. Resonant inelastic X-ray scattering experiments and theoretical calculations revealed an increase in unoccupied 5d states of Au when the substituent group is a donating group, which leads to a dramatic increase in catalytic activity.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 940-943
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theory of Translational Energy Relaxation in Binary Mixtures of Dilute Gases with Chemical Reaction
Autorzy:
Cukrowski, A. S.
Fritzsche, S.
Popielawski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1924286.pdf
Data publikacji:
1992-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.Rp
82.20.-w
82.20.Mj
82.20.Wt
05.20.Dd
Opis:
A simple approach to the process of translational energy relaxation in dilute gases due to Dahler, Malkin, Shizgal and others is extended to the case of systems with chemical reaction. Fundamental quantities characterizing the relaxation processes such as the relaxation time and collision numbers during this time are computed for a number of molecular models of the chemical reaction (the Prigogine-Xhrouet model, the line-of-centers model, a modified line-of-centers model, and reverse versions of these models). Results of this analytical theory are compared with the results of numerical simulations of solutions of the appropriate Boltzmann equation with the use of the modified Nanbu-Babovsky method. This comparison leads to very good agreement between the analytical theory and numerical calculations. A marked influence of the chemical reaction on the translational relaxation in a dilute gas is another important conclusion of this paper.
Źródło:
Acta Physica Polonica A; 1992, 82, 6; 1005-1022
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Positron Spectroscopy for the Detection of Nanostructures in Water-Alcohol Mixtures
Autorzy:
Stepanov, P.
Byakov, V.
Zaluzhnyi, A.
Powiązania:
https://bibliotekanauki.pl/articles/1338564.pdf
Data publikacji:
2014-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.-w
82.20.Pm
82.30.Gg
82.80.Ej
Opis:
Analysis of the o-Ps lifetimes concentration dependences in water-propanol mixtures (with and without $CoCl_2$ additive) shows that this mixture looks like an emulsion of alcohol micelles in water at propanol mole fractions 0.1-0.4.
Źródło:
Acta Physica Polonica A; 2014, 125, 3; 767-769
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonequilibrium Effects in a Bimolecular Chemical Reaction in a Dilute Gas
Autorzy:
Cukrowski, A. S.
Fritzsche, S.
Popielawski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929592.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.-w
82.20.Mj
82.20.Wt
82.30.Eh
05.20.Dd
Opis:
Perturbation solution of the Boltzmann equation for a dilute gas with a chemical reaction A + A → B + B is presented. Analytical results for the nonequilibrium effects on the rate of chemical reaction are obtained for the line-of-centers model. It is shown that taking into account the energy transfer from reagents A to products B permits to get new results. The nonequilibrium corrections obtained from these results are much larger than those obtained with neglecting this energy transfer. These results are verified by a comparison with the numerical results obtained from the modified Nanbu-Babovsky Monte Carlo computer simulations.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 369-382
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetics and Mechanical Studies of Melaminium bis(trichloroacetate) dihydrate
Autorzy:
Kanagathara, N.
Marchewka, M.
Gunasekaran, S.
Anbalagan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1205304.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.Pm
65.40.-b
82.20.-w
62.20.Qp
83.50.-v
Opis:
The thermal decomposition kinetics of melaminium bis(trichloroacetate) dihydrate (MTCA) has been studied by thermogravimetry and derivative thermogravimetry techniques using non-isothermal experiments at three different heating rates 10, 15, and 20°C $\text{min}^{-1}$. Non-isothermal studies of MTCA revealed that the decomposition occurs in three stages involving dehydration and decomposition. The apparent activation energy $(E_{a})$ and the pre-exponential factor (ln A) of each stage of thermal decomposition at various linear heating rates are calculated using Flynn-Wall, Friedman, Kissinger, and Kim-Park method. A significant variation of effective activation energy $(E_{a})$ with conversion $(α)$ indicates that the process is kinetically complex. The linear relationship between the A and $E_{a}$ values is well established (compensation effect). Isothermal kinetics of thermal decomposition of MTCA was found to obey Avrami-Erofeev's (A4) and power law (P3) equations. In addition to the above, mechanical properties have been estimated by Vicker's microhardness test for the grown crystal.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 827-832
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Resolved IR and X-Ray Simultaneous Spectroscopy: New Opportunities for the Analysis of Fast Chemical-Physical Phenomena in Materials Science
Autorzy:
Marcelli, A.
Hampai, D.
Xu, Wei
Malfatti, L.
Innocenzi, P.
Powiązania:
https://bibliotekanauki.pl/articles/1808498.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.Qe
61.05.cj
82.20.-w
78.47.-p
Opis:
New powerful sources and advanced analytical techniques have been considered in the last decade to face up the continuously increasing scientific demands, in particular, in materials science. As an example, nano- science and nanotechnology researches are characterized by ultimate spatial resolution, fast and ultrafast time-resolved analysis, but the complexity of the investigated phenomena requires new analytical capabilities and new experimental techniques were introduced in the research arena. The availability all over the world of brilliant synchrotron radiation sources offers incredible opportunities. Many challenging experiments were made possible by these sources and understanding of many complex dynamical problems was obtained. Nevertheless, a strong demand of new analytical approaches, mainly based on concurrent and possibly simultaneous time-resolved experimental techniques, is emerging. Pioneering time resolved experiments combining X-ray and infrared radiation with a conventional source were performed more than a decade ago. Nowadays, many beamlines at third generation synchrotron radiation facilities are equipped with conventional sources to allow complementary techniques and the strategy of a concurrent analysis is mandatory in the investigation of many phenomena in frontier multidisciplinary researches. Moreover, new opportunities will be available by means of concurrent spectroscopic experiments investigating complex phenomena on a short timescale, from the sub-second to the microsecond time domain. We will present and discuss researches where the combination of IR and X-ray simultaneous experiments may return unique information on complex dynamical processes and phase transitions occurring in materials science. Finally, we will briefly describe the conceptual layout of a synchrotron radiation beamline to perform concurrent IR and X-ray experiments.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 489-500
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Escape of O⁺ and CO⁺ Ions from Mars and Titan Atmospheres by Coulomb Explosion of CO₂²⁺ Molecular Dications
Autorzy:
Falcinelli, S.
Powiązania:
https://bibliotekanauki.pl/articles/1033346.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.ag
31.50.Bc
33.15.Ta
33.80.Eh
37.20.+j
95.30.Cq
95.30.Dr
95.30.Ft
95.30.Ky
94.05.Rx
94.20.Cf
94.20.D-
94.20.dv
94.20.W-
94.20.wg
Opis:
Main properties of multiply charged molecular ions (energetics, structure, stability, lifetime and fragmentation dynamics) are relevant to know and to model the behavior of gaseous plasmas, planetary ionospheres, and astrophysical environments. Experimental measurements of the kinetic energy released of fragment ions produced by the Coulomb explosion of molecular dications (doubly charged molecular species) originating by double photoionization of CO₂ molecules, are reported and discussed. The kinetic energy released, as a function of the UV photon energy in the range of 34-50 eV, is extracted from the electron-ion-ion coincidence spectra recorded by using tunable synchrotron radiation coupled with ion imaging techniques at the GasPhase beam line of ELETTRA Synchrotron Light Laboratory Trieste, Italy. This kind of experiment allows assessing the probability of escape for simple ionic species in the ionosphere of Mars and Titan. The kinetic energy released, measured in the case of O⁺ and CO⁺ fragment ions, are ranging between 1.0-5.0 and 0.4-3.0 eV, respectively. These values are large enough to allow such ionic species in participating in the atmospheric escape from Mars (only O⁺ ions) and Titan (both O⁺ and CO⁺ ions) into space. In the case of Mars, we suggest a possible rationalization for the observed behavior of the O⁺ and CO₂²⁺ ion density profiles by Viking 1 lander and Mariner 6 spacecraft.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 112-116
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoconductivity of Bi$\text{}_{12}$Ti$\text{}_{1-x}$Pb$\text{}_{x}$O$\text{}_{20}$ Single Crystal
Autorzy:
Borowiec, M. T.
Kozankiewicz, B.
Szymczak, H.
Żmija, J.
Majchrowski, A.
Załęski, M.
Zayarnyuk, T.
Powiązania:
https://bibliotekanauki.pl/articles/2011193.pdf
Data publikacji:
1999-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.40.+w
78.20.Nv
72.20.Jv
Opis:
Single crystals of mixed sillenites Bi$\text{}_{12}$Ti$\text{}_{1-x}$Pb$\text{}_{x}$O$\text{}_{20}$ were grown using the top seeded solution growth method. The pulse illumination was used to study the phototransport properties of these crystals. It was evidenced that the illumination changed the photoconducting properties by 4-5 orders of magnitude comparing with previously studied Bi$\text{}_{12}$MeO$\text{}_{20}$, where Me = Ge, Si, Ti. The performed experiments indicate on the photogeneration of metallic grains in the insulating matrix of Bi$\text{}_{12}$Ti$\text{}_{1-x}$Pb$\text{}_{x}$O$\text{}_{20}$. Correlations between photochromism and photoconductivity was established.
Źródło:
Acta Physica Polonica A; 1999, 96, 6; 785-792
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZnO Thin Films Synthesized by Sol-Gel Process for Photonic Applications
Autorzy:
Znaidi, L.
Touam, T.
Vrel, D.
Souded, N.
Ben Yahia, S.
Brinza, O.
Fischer, A.
Boudrioua, A.
Powiązania:
https://bibliotekanauki.pl/articles/1490964.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
61.46.-w
78.20.-e
Opis:
Undoped and aluminum-doped ZnO thin films are prepared by the sol-gel process. Zinc acetate dihydrate, ethanol and monoethanolamine are used as precursor, solvent and stabilizer, respectively. In the case of Al-doped ZnO, aluminum nitrate nonahydrate is added to the precursor solution with an atomic percentage equal to 1 or 2 at.% Al. The multi thin layers are prepared by spin-coating onto glass substrates, and are transformed into ZnO upon annealing at 550°C. Films with preferential orientation along the c-axis are successfully obtained. The structural, morphological, and optical properties of the thin films as a function of aluminum content have been investigated for different elaboration parameters (e.g. layer number) using X-ray diffraction, atomic force microscopy, scanning electronic microscopy. Waveguiding properties of the thin films have been also studied using m-lines spectroscopy. The results indicate that our films are monomodes at 632.8 nm with propagation optical loss estimated around 1.6 dB/cm.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 165-168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photovoltaic Effect and Space Charge Limited Current Analysis in $TlGaTe_2$ Crystals
Autorzy:
Qasrawi, A.
Yaseen, T.
Eghbariy, B.
Gasanly, N.
Powiązania:
https://bibliotekanauki.pl/articles/1419787.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.-i
72.20.Ht
72.40.+w
Opis:
Anisotropic space charge limited current density analysis and photovoltaic effect in $TlGaTe_2$ single crystals has been investigated. It is shown that, above 330 K, the crystal exhibits intrinsic and extrinsic type of conductivity along (c-axis) and perpendicular (a-axis) to the crystal's axis, respectively. The current density (J) is found to be space charge limited. It is proportional to the square and three halves power of voltage (V) along the a- and c-axis, respectively. Along the a-axis and at sufficiently low electric field values, the activation energy of the current density is found to depend on the one half power of electric field. At high electric fields, the activation energy is field invariant. This behavior is found to be due to the Pool-Frenkel effect and due to a trap set located at 0.26 eV, respectively. Along the c-axis the crystal is observed to operate under the Child-Langmuir space charge limited regime. $TlGaTe_2$ crystals are found to exhibit photovoltaic properties. The open circuit photovoltage is recorded as a function of illumination intensity at room temperature.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 152-155
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 133

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