Wszystkie pola: Chen, Peng - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Photo-oxidative Aging Behaviors of Acrylic Coatings during UV Irradiation Investigated by Positron Annihilation Spectroscopy
Autorzy:: Zhao, Xipo
Cai, Xiaolin
Liu, Chang
Chen, Ting
He, Chunqing
Fang, Pengfei
Peng, Shaoxian
Powiązania:: https://bibliotekanauki.pl/articles/1033253.pdf
Data publikacji:: 2017-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: Acrylic coating
UV irradiation
positron annihilation spectroscopy
Opis:: Slow positron annihilation spectroscopy, contact angle and scanning electron microscope (SEM) were employed to investigate the surface polarity and morphologies as functions of aging time in acrylic coatings during UV-a irradiation. The S parameter plots of each exposed sample are lower than that of the virgin sample in the whole range of E. The S parameter plots become lower as the exposing longer time, indicated that the irradiation generated more polar groups and increased the oxidation layer depth. Combined with surface morphology and the surface energy of acrylic coating, the variation of contact angle, and surface energy, polar component and dispersive component is related with surface polarity and morphologies.
Źródło:: Acta Physica Polonica A; 2017, 132, 5; 1527-1530
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Research on the Optical and EPR Spectral Data and the Local Structure for the Tetragonal $Nb^{4+}$ Center in Glasses
Autorzy:: Wu, Xiao-Xuan
Yu, Xin-Peng
Zheng, Wen-Chen
Powiązania:: https://bibliotekanauki.pl/articles/1402323.pdf
Data publikacji:: 2015-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.30.He
71.70.Ch
78.40.Pg
78.55.Qr
Opis:: Two optical bands and four EPR (or spin-Hamiltonian) parameters (g factors $g_{∥}$, $g_{⊥}$ and hyperfine structure constants $A_{∥}$, $A_{⊥}$) of the tetragonally-compressed $Nb^{4+}$ octahedral center in glasses are calculated from two methods, the complete diagonalization (of energy matrix) method and the perturbation theory method. Both methods are founded on the two-spin-orbit-parameter model where both the contribution to the spectral data from the spin-orbit parameter of central $d^{n}$ ion and that of ligand ion via covalence effect are considered. The calculated results from both the complete diagonalization (of energy matrix) method and perturbation theory method show reasonable agreement with the experimental values. The signs and possible misprint for the observed hyperfine structure constants $A_{∥}$ and $A_{⊥}$ are suggested, and the local structure of the tetragonal $Nb^{4+}$ center in glasses due to the Jahn-Teller effect is gained from the calculations. The results are discussed.
Źródło:: Acta Physica Polonica A; 2015, 128, 1; 72-75
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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