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Wyświetlanie 1-15 z 19
Tytuł:
Influence of low temperature on the free volume in polyethylene by positron annihilation
Autorzy:
Osoba, W.
Powiązania:
https://bibliotekanauki.pl/articles/146305.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
positron annihilation
polymers
free volume
Opis:
Positron lifetime measurements were performed as a function of temperature in thermo-shrunken, modified polyethylene. Mean volume of free volume cavities in the investigated polymer was estimated from the results of the measurements. This mean volume turned out to be a smooth function of temperature (from room temperature to 8.5 K). The effect of trapping of free electrons, produced during positron irradiation, was observed at lowered temperature.
Źródło:
Nukleonika; 2010, 55, 1; 69-72
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positrons in naphthalene : critical remarks on the relation between o-Ps lifetime and void size
Autorzy:
Goworek, T.
Zgardzińska, B.
Wawryszczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/148003.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
high pressure
naphthalene
positronium quenching
free volume
Opis:
Lowering the temperature or applying high pressure leads to elimination of positronium component in the e+ lifetime spectrum in solid naphthalene. Disappearance of positronium means reaching the free volume size limit at which there is no energy level in the potential well. It allows to estimate that size, which is found inconsistent with predictions of the popular Tao-Eldrup model. The range of applicability of that model is discussed. The dependence of the free e+ decay constant on pressure indicates that positronium is formed not only in the blob processes, but during the whole free positron life. The lifetime of free positrons begins to rise with temperature earlier than Ps intensity.
Źródło:
Nukleonika; 2013, 58, 1; 183-187
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bean cotyledons microporosity under hydration conditions
Autorzy:
Golonka, P.
Dryzek, J.
Kluza, M.
Powiązania:
https://bibliotekanauki.pl/articles/147053.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
bound water
free volume
PAS
proton NMR
Opis:
Positron Annihilation Spectroscopy (PAS), proton Nuclear Magnetic Relaxation (NMR) and hydration kinetics measurements were applied to study the free volume formation process in the initial stages of bean cotyledons imbibition. These methods allowed us to analyse the behaviour of bound water in the bean cotyledon molecular structure, and to observe free volume regions formed there. They also made it possible to describe their dimensions and concentration quantitatively. Good correlation was found between the increase of the free volume radius and the amount of water bound to the bean cotyledon solid matrix.
Źródło:
Nukleonika; 2002, 47, 4; 137-140
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix
Autorzy:
Wieczorek, A.
Zgardzińska, B.
Jasińska, B.
Gorgol, M.
Bednarski, T.
Białas, P.
Czerwiński, E.
Gajos, A.
Kamińska, D.
Kapłon, Ł.
Kochanowski, A.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krzemień, W.
Kubicz, E.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Rudy, Z.
Rundel, O.
Sharma, N. G.
Silarski, M.
Silarski, A.
Strzelecki, A.
Wiślicki, W.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/147132.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
free volume
positron annihilation
polystyrene
positronium
scintillator
Opis:
The polystyrene doped with 2,5-diphenyloxazole as a primary fluor and 2-(4-styrylphenyl)benzoxazole as a wavelength shifter prepared as a plastic scintillator was investigated using positronium probe in wide range of temperatures from 123 to 423 K. Three structural transitions at 260, 283, and 370 K were found in the material. In the o-Ps intensity dependence on temperature, the significant hysteresis is observed. Heated to 370 K, the material exhibits the o-Ps intensity variations in time.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 777-781
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free-Volume Evolution of 1-Propanol Confined in Variously Filled Regular Mesopores of SBA-15 Matrix
Autorzy:
Šauša, O.
Lukešová, M.
Švajdlenková, H.
Bartoš, J.
Powiązania:
https://bibliotekanauki.pl/articles/1033259.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
positron annihilation
1-propanol
confined systems
free-volume
Opis:
The free-volume of 1-propanol (1-PrOH) confined in a regular mesoporous SBA-15 matrix was investigated by desorption experiment at room temperature and over a wide temperature range, from 15 K up to 350 K, for four different contents of 1-PrOH in the pores. The gradual desorption of 1-PrOH from the mesopores as well as the free volume temperature dependences have shown that the polar molecules of 1-PrOH located at the inner polar surface of the SBA-15 matrix are more strongly bound to the matrix surface. The subsequent discussion of the annihilation and free-volume characteristics follows.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1572-1574
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation Studies of the Free Volumes in Nylon12/PVA Films Treated by Supercritical Carbon Dioxide
Autorzy:
Li, Jingjing
Yin, Chongshan
Zhou, Yawei
Li, Gang
Yeh, Jen-taut
He, Chunqing
Powiązania:
https://bibliotekanauki.pl/articles/1033920.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Nylon12/PVA
ScCO₂
positron annihilation
free volume
relaxation
Opis:
Free volume variations of Nylon12/Polyvinyl alcohol (Nylon12/PVA) blends treated in supercritical carbon dioxide (ScCO₂) were investigated using positron annihilation lifetime spectroscopy. It is found that o-Ps lifetime τ₃ and the corresponding intensity I₃ in Nylon12/PVA decrease with increase of the PVA content. Being treated in ScCO₂ at 50°C and 20 MPa for 1 h, the free volume holes in Nylon12/PVA blends expand to different extents depending on the weight ratio of PVA. After releasing of CO₂, the free volume size decreases as a function of the elapsed time due to the molecular relaxation, and the relaxation time constant depends on the content of PVA in the blends.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1552-1555
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of free volumes and light transmission in hydrogel and silicone-hydrogel polymer contact lenses
Autorzy:
Kocela, A.
Miedzinski, R.
Filipecka, K.
Filipecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/173601.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
positron annihilation
UV-vis-NIR
polymers
contact lenses
free volume
Opis:
The free volume holes and light transmission of hydrogel and silicone-hydrogel polymer contact lenses were investigated. As the material, the Proclear family (omafilcon A) of hydrogel contact lenses and the Biofinity family (comfilcon A) of silicone-hydrogel contact lenses were used. Positron annihilation lifetime spectroscopy was used to characterize geometrical sizes and fractions of the free volume holes in the investigated samples. There was a clear difference in the size of free volume holes and the fractional free volume between silicone-hydrogel and hydrogel polymer contact lenses. These changes are shown by a thorough analysis of the long-lived component of lifetime of ortho-positronium. At the same time, UV-vis-NIR in the spectral range 200-1000 nm studies were performed on the same samples of contact lenses spectrometry.
Źródło:
Optica Applicata; 2016, 46, 1; 35-45
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biodegradable polyester blend and copolyesters studied by positron annihilation and other methods
Autorzy:
Dębowska, M.
Rudzińska-Girulska, J.
Serwadczak, M.
Kiersnowski, A.
Pigłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/146301.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
mixing of polymers
polyesters
transesterification
positron annihilation
positronium
free volume
Opis:
Two polyesters, i.e. an aromatic one: poly(butylene terephthalate) – PBT and an aliphatic one: poly(ĺ- -caprolactone) – PCL were mixed in melt to obtain a biodegradable product. DSC, 1H NMR, SEM, WAXS, SAXS, BOD and PALS measurements were performed to study the homopolymers as well as their physical blend and copolyesters. The latter were obtained due to the transesterification reaction. Ortho-positronium (o-Ps) annihilation lifetimes were used to create the distributions of free volume. The progressive changes in probability density function of free volume, i.e. increase in large free volume holes contribution to the total free volume, appearing when going from the homopolymers to the blend and then to the copolyesters reflect the influence of: the addition of aliphatic polyester, the weight fraction of it in the composition and transesterification. The higher contribution of larger free volume holes corresponds well with the reduced crystallinity of compositions revealed in X-ray diffraction and the worsening of the regularity of structure of the macromolecules involved in formation of crystals, deduced from the 1H NMR.
Źródło:
Nukleonika; 2010, 55, 1; 57-64
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PALS investigation of resorcinol under high pressure
Autorzy:
Tydda, M.
Jasińska, B.
Pieniążek, A.
Powiązania:
https://bibliotekanauki.pl/articles/147999.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
free volume
ortho-positronium (o-Ps)
pressure
positron annihilation lifetime spectroscopy (PALS)
Opis:
Two kinds of measurements were conducted with resorcinol at high pressure : the first one with the use of a mechanical press and the second one with the use of a gaseous compressor. In the second case, due to some gas penetrating the material structure, the lifetime spectra obtained were difficult to analyze. The free volumes in resorcinol were influenced both by high pressure and the gas coming into the crystallographic structure.
Źródło:
Nukleonika; 2013, 58, 1; 195-198
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the free volume sizes and shapes determined from crystallographic and PALS data
Autorzy:
Tydda, M.
Jasińska, B.
Powiązania:
https://bibliotekanauki.pl/articles/146378.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
benzenediols
free volume
molecular crystals olanzapine
positron annihilation
positronium
positronium diffusion coefficient
Opis:
Two different classes of molecular crystals were investigated. The first group was benzenediols, which are characterized by the same chemical composition but a different organization of their crystallographic structures; all of the compounds from this group have only one kind of free volumes. The second class was represented by olanzapine, which has more complex chemical composition and two kinds of free volumes in the structure. The o-Ps lifetime values determined from positron annihilation lifetime spectroscopy (PALS) measurements agree quite well with those calculated for sizes found from crystallographic data for benzenediols (agreement within 10% of the lifetime values). For olanzapine, a good agreement is observed in the case of cuboidal free volumes, while for the other kind of void, the agreement is less satisfactory. Positronium diffusion coefficient determined from o-Ps redistribution in olanzapine agrees with these found for polymers.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 771-775
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of unicellular microorganisms Saccharomyces cerevisiae by means of positron annihilation lifetime spectroscopy
Autorzy:
Kubicz, E.
Jasińska, B.
Zgardzińska, B.
Bednarski, T.
Białas, P.
Czerwiński, E.
Gajos, A.
Gorgol, M.
Kamińska, D.
Kapłon, Ł.
Kochanowski, A.
Korcyl, G.
Kowalski, P.
Kozik, T.
Krzemień, W.
Niedźwiecki, S.
Pałka, M.
Raczyński, L.
Rajfur, Z.
Rudy, Z.
Rundel, O.
Sharma, N. G.
Silarski, M.
Słomski, A.
Strzelecki, A.
Wieczorek, A.
Wiślicki, W.
Zieliński, M.
Moskal, P.
Powiązania:
https://bibliotekanauki.pl/articles/147902.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
environmental scanning electron microscopy (ESEM)
free volume
inverted microscopy
positron annihilation
positronium
yeasts
Opis:
Results of positron annihilation lifetime spectroscopy (PALS) and microscopic studies on simple microorganisms, brewing yeasts, are presented. Lifetime of ortho-positronium (o-Ps) were found to change from 2.4 to 2.9 ns (longer-lived component) for lyophilized and aqueous yeasts, respectively. Also hygroscopicity of yeasts in time was examined, allowing to check how water – the main component of the cell – affects PALS parameters, thus lifetime of o-Ps were found to change from 1.2 to 1.4 ns (shorter-lived component) for the dried yeasts. The time sufficient to hydrate the cells was found below 10 hours. In the presence of liquid water, an indication of reorganization of yeast in the molecular scale was observed. Microscopic images of the lyophilized, dried, and wet yeasts with best possible resolution were obtained using inverted microscopy (IM) and environmental scanning electron microscopy (ESEM) methods. As a result, visible changes to the surface of the cell me mbrane were observed in ESEM images.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 749-753
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porównawcza struktury wewnętrznej implantów hydrofilowych oraz hydrofobowych stosowanych w chirurgii okulistycznej metodą spektroskopii czasów życia pozytonów
Comparative analysis of internal structures of hydrophilic and hydrophobic implants applied in ophthalmology by means of positron annihilation lifetime spectroscopy
Autorzy:
Chamerski, K.
Powiązania:
https://bibliotekanauki.pl/articles/134780.pdf
Data publikacji:
2015
Wydawca:
ADVSEO
Tematy:
soczewki wewnątrzgałkowe
anihilacja pozytonów
wolna objętość
wielozadaniowość
hydrofilowość
hydrofobowość
chromofory
intraocular lenses
positron annihilation
free volume
multivacancies
hydrophilicity
hydrophobicity
chromophores
Opis:
In presented work internal structures of intraocular lenses were analyzed in terms of defectiveness degree. Studies were conducted by means of positron annihilation lifetime spectroscopy method PALS. The aim of the work was determination of basic parameters describing annihilation centers in research materials, such as positron lifetime in bulk material, mean positron lifetime in the internal structure, positron trapping rate by trapping centers as well as free volumes dimensions. In obtained results differences in free volumes and positron traps concentrations between hydrophilic and hydrophobic materials were noted. Furthermore, comparison of materials with and without blue light chromophores revealed differences in positron trapping rate by multivacancy-like free spaces. Achieved results were referenced for mechanical properties of the studied materials.
Źródło:
Technical Issues; 2015, 3; 3-10
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamics And Concentration Fluctuations Of Liquid Al-Cu And Al-Zn Alloys
Termodynamika i fluktuacje stężenia ciekłych stopów Al-Cu oraz Al-Zn
Autorzy:
Trybuła, M.
Jakse, N.
Gąsior, W.
Pasturel, A.
Powiązania:
https://bibliotekanauki.pl/articles/353565.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Cu alloys
Al-Zn alloys
CSRO parameter
free volume model
diffusivity
stopy Al-Cu
stopy Al-Zn
parametr CSRO
model swobodnej objętości
dyfuzyjność
Opis:
Thermodynamic properties of liquid Al-Cu and Al-Zn alloys are investigated using the free volume model. We also analyse local atomic arrangements and concentration fluctuations in both liquid binary alloys from the determination of the Warren-Cowley short-range order. For liquid Al-Cu alloys, our findings indicate a strong preference for heteroatomic nearest-neighbors bonds on the Cu-rich side and weaker ones in the Al-rich part while for the liquid Al-Zn alloy, a tendency to the phase separation is observed. Basing on Darken’s thermodynamic relationship, diffusivity has been examined for both liquid alloys.
W oparciu o model swobodnej objętości zostały zbadane właściwości termodynamiczne ciekłych stopów Al-Cu i Al-Zn oraz lokalne środowisko atomów w celu obliczenia parametru bliskiego zasięgu Warren-Cowleya. W ciekłych stopach Al-Cu zaobserwowano silną tendencję do tworzenia wiązań hetero-atomowych w obszarze bogatym w Cu, natomiast w obszarze stężeń bogatych w Al znacznie słabszą. W przypadku ciekłych stopów Al-Zn obliczenia wskazują na tendencję do segregacji atomów. Dyfuzja w dyskutowanych stopach została przeanalizowana w oparciu o termodynamiczną definicję podaną przez Darkena.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 649-655
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of DSC curves and the Kronmüller theory to study the level of structural defects of Fe-based bulk amorphous alloys
Autorzy:
Jeż, Bartłomiej
Nabiałek, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2204536.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bulk amorphous alloys
soft magnetic materials
free volume
structural defects
injection casting
miękkie materiały magnetyczne
wady konstrukcyjne
odlewanie wtryskowe
masywne stopy amorficzne
wolna objętość
Opis:
This article presents the results of tests carried out on rapid quenched Fe-based alloys. The alloys were made using an injection-casting method. The actual structure of the alloys was also studied using an indirect method, based on H. Kronmüller's theorem. Based on analysis of the primary magnetization curves, in accordance with the aforementioned theory, it was found that Mo causes a change in internal regions associated with changes in the direction of the magnetization vector. The evolution of the thermal properties with increasing volume of Mo has been confirmed by the DSC curves. Addition of Mo, at the expense of the Nb component, results in changes to the crystallization process (i.e. the crystallization onset temperature and number of stages). The study showed that the addition of Mo at the expense of Nb reduces glass forming ability. Based on the DSC analysis, free volumes were determined for the alloys tested. These values were compared with the analysis of primary magnetization curves. It was found that the DSC curves can be used to indirectly describe the structure of amorphous alloys similar to the theory of the approach to ferromagnetic saturation. This approach is new and can be used by many researchers in this field.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144613
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of acoustical parameters in binary liquid mixture containing 1-butanol and hexane at temperatures 313.15 K, 318.15 K and 323.15 K
Autorzy:
Srinivasu, C. H.
Kumar, A. K.
Fakruddin, S. K.
Narendra, K.
Anjaneyulu, T.
Powiązania:
https://bibliotekanauki.pl/articles/412551.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
density
ultrasonic velocity
viscosity
1-butanol
hexane
adiabatic compressibility
free length and molar volume
Opis:
The values of ultrasonic velocity (u), density (ρ), and viscosity (η) have been measured experimentally in the binary liquid mixture containing 1-butanol and hexane over the entire range of composition at different temperatures 313.15 K, 318.15 K and 323.15 K. This experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (β), free length (Lf), molar volume (Vm) and acoustic impedance(z). The results have been qualitatively used to explain the molecular interactions between the components of the liquid mixture.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 13; 1-7
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
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