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Strona główna » Instytut » Pracownicy » Bożena Zgardzińska

dr Bożena Zgardzińska

Zakład

Zakład Metod Jądrowych

Stanowisko:

adiunkt

Kontakt:

pokój: 42B
telefon: (081) 537-62-86
e-mail: bozena.zgardzinska@umcs.pl

Funkcje pełnione w IF UMCS:

Zastępca Dyrektora Instytutu Fizyki 2017-

Publikacje: Ukryj abstrakty

  1. B. Zgardzińska,T. Goworek, Positronium as a probe of structure and stability of solid phases in binary n-alkane mixtures, Chemical Physics, 368(), 2010, 101 – 107

  2. B. Zgardzińska,M. Paluch,T. Goworek, Positronium lifetime in supercooled 1-butanol. search for polyamorphism, Chemical Physics Letters, 491(), 2010, 160- 163

  3. B. Zgardzińska,T. Goworek, Positronium in solid phases of methanol , Chemical Physics Letters, 501(), 2010, 44-46

  4. B. Zgardzińska,T. Goworek, Positron study of the structure of nanodecane- tricosane mixed solid, Nukleonika, 55(), 2010, 47-49

  5. B. Zgardzińska, J. Wawryszczuk, T. Goworek, Positronium in the n-alkane binarymixture: Nonadecane-heneicosane, Chemical Physics Letters, 470(), 2009, 72-74

  6. B. Zgardzińska, T. Goworek, J. Wawryszczuk, Positronium in alkanes at high pressure of argon and nitrogen, Material Science Forum, 607(), 2009, 45-47

  7. T. Goworek, M. Pietrow, R. Zaleski, B. Zgardzińska, Positronium in high temperature phases of long-chain even alkanes, Chemical Physics, 355(), 2009, 123-129

  8. Zgardzińska, B. Goworek , T., Positronium in phase IV and rotator phase of long-chain alkanes, Acta Physica Polonica A, 113(), 2008, 1551-1555

  9. Zgardzińska, B. Goworek , T., Positronium in n-nonadecane at high pressure of nitrogen, Chemical Physics Letters, 457(), 2008, 320-322

  10. Zgardzińska, B. Goworek, T. Wawryszczuk, J., Positronium in alkanes at high pressure of argon and nitrogen, China, Positronium Chemistry PPC-9, Wuhan University, (), 2008, O5.1, 123

  11. Zgardzińska, B. Zaleski, R. Wawryszczuk, J. Pietrow, M. Goworek, T., Intermolecular free volumes and intramolecular defects in alkanes,Czech Republic, Praha, Abstract of International workshop, Positron studies in defects, (), 2008, 50

  12. Zgardzińska, B. Hirade, T. Goworek, T., Diffusion length of positrons and electrons, Tokyo, Abstract of 2-nd Asia-Pacific Symposium on Radiation Chemistry APSRC-2008 Waseda University Tokyo, (), 2008,

  13. Goworek, T. Zgardzińska, B., Ortho-positronium in alkanes under high pressure, Acta Physica Polonica A, 113(), 2008, 1379-1383

  14. Zaleski, R. Zgardzińska, B. Pietrow, M. Goworek, T., Positron irradiation effects in simple organic solids, Radiation Physics and Chemistry, 77(), 2008, 1306-1310

  15. Goworek, T. Wawryszczuk, J. Zaleski, R. Zgardzinska, B., Positronium in solid phases of long-chain paraffins, Radiation Physics and Chemistry, 76(2), 2007, 185-188

    Abstract:
    The study of positronium intensity rise in long-chain alkanes shows two kinds of electron traps: the first, which are discharged at low temperature (200 K); the other, which remain populated up to the transition point to the rotator phase; e.g. in C30H62 they are still observed at 328 K. In the rigid phase of even-numbered alkanes o-Ps lifetime is shorter than that of odd-numbered ones, due to the difference in the width of gap between the molecular lamellae. (c) 2006 Elsevier Ltd. All rights reserved.

  16. Zgardzińska, B. Goworek, T. Zaleski, R. Wawryszczuk, J., Positron annihilation and phase transitions in argon intercalated n-nonadecane, Chemical Physics, 335(), 2007, 1-6

  17. Zgardzińska, B. Hirade, T. Goworek, T., Positron formation on trapped electrons in n-heptadecane, Chemical Physics Letters, 446(), 2007, 309-312

  18. Sniegocka, M. Jasinska, B. Goworek, T. Zaleski, R., Temperature dependence of o-Ps lifetime in some porous media. Deviations from ETE model, Chemical Physics Letters, 430(4-6), 2006, 351-354

    Abstract:
    Temperature dependence of ortho-positronium lifetime in some porous materials was investigated. Above the room temperature the extended Tao-Eldrup model works rather well, however at low temperatures one observes in all samples the lifetimes evidently longer than expected. (c) 2006 Elsevier B.V. All rights reserved.

  19. Sniegocka, M. Jasinska, B., Redistribution of o-Ps in porous Vycor glass. Crystallization of silica at high temperatures, Acta Physica Polonica A, 110(5), 2006, 721-727

    Abstract:
    The positron annihilation lifetime spectroscopy was applied to study the porous Vycor glass annealed at the temperatures between 950 and 1050 K. With increased temperature the spectra show significant decrease in o-Ps lifetime and intensity in the pores, while the rise of intensity in the small intermolecular voids is observed. Similar changes are observed as a function of annealing time at fixed temperature depending on the time and temperature of thermal treatment. They can originate from partial crystallization of the silica in the material under study.

  20. Zgardzinska, B. Pietrow, M. Goworek, T. Wawryszczuk, J., Ortho-positronium in some n-alkanes; Influence of temperature and pressure, Acta Physica Polonica A, 110(5), 2006, 747-753

    Abstract:
    Positron lifetime spectra were measured for a series of odd- numbered n-alkanes from C11H24 to C19H40 as a function of temperature and pressure. The ortho-Ps lifetimes in the rotator phase and the increase in intensity at the transition to that phase can be explained by location of Ps in the vicinity of kink-type conformers. The relation between o-Ps lifetime and molecule length can be described in the framework of extended Tao-Eldrup model. One can eliminate the effect of intensity rise in time by sample illumination or by application of high pressure. A decrease in temperature by 1 K is equivalent to an increase in pressure by about 4 MPa.

  21. Zgardzinska, B. Wawryszczuk, J. Goworek, T., Positron annihilation in argon intercalated n-alkanes at high pressure, Chemical Physics, 320(2-3), 2006, 207-213

    Abstract:
    Positron annihilation lifetime spectroscopy was used to observe the effects of argon intercalation in some solid long-chain alkanes at high pressure. The ortho-Ps lifetime rises with argon pressure, which means increase of free volumes in the alkane structure. The range of pressures in which the rotator phase exists increases, comparing. to pure alkane. In n- heptadecane, n-nonadecane, and possibly n-heneicosane, a stepwise change of ortho-Ps lifetime and intensity at 12 MPa is observed, suggesting the transition to a new kind of the rotator phase. The transition rate is low, final lifetime value is approximate to 3.3 us. Despite a large size of free volumes corresponding to such a lifetime, their compressibility is found negligible up to the pressure of 90 MPa. At low pressures the compressibility of free volumes in the rotator phase is negative. (c) 2005 Elsevier B.V. All rights reserved.

  22. Sniegocka, M. Jasinska, B. Wawryszczuk, J. Zaleski, R. Derylo-Marczewska, A. Skrzypek, I., Testing the extended Tao-Eldrup model. Silica gels produced with polymer template, Acta Physica Polonica A, 107(5), 2005, 868-873

    Abstract:
    The temperature dependence of o-Ps lifetime in the pores calculated from extended Tao-Eldrup model was compared to the experimental data, collected for a set of silica gels synthesized using the polymer template technique. For the sample with average pore radii 2.0 nm rather good agreement between the model and experiment was found. For the sample with narrow pores (near 1.0 nm) the lifetime spectrum was complex. Except the range of highest temperatures the lifetimes are far from model calculations.

  23. Zgardzinska, B. Zaleski, R. Wawryszczuk, J. Goworek, T., Positronium in solid phases of n-pentacosane, Physics Letters A, 333(3-4), 2004, 341-346

    Abstract:
    Positron annihilation lifetime spectra in solid n-pentacosane were measured as a function of the temperature and positron irradiation time. Phase IV was found to be well visible in the cooling runs due to its easy supercooling; a small increase of ortho-Ps lifetime in phase IV compared to low-temperature phase indicates that predominant intramolecular defects are end- gauche ones. The effect of excess electron accumulation, typical mainly of polymers, was also observed; two kinds of electron traps were found. The main trap component had activation enthalpy 0.6 eV and disappeared at about 250 K; an additional fast accumulating component existed up to the temperatures near the transition to the rotator phase. (C) 2004 Elsevier B.V. All rights reserved.


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