TY  - JOUR
A1  - Tiseanu, Carmen
A1  - Parvulescu, Vasile Ion
A1  - Cojocaru, Bogdan
A1  - Lorenz-Fonfria, Victor A.
A1  - Kumke, Michael Uwe
A1  - Gessner, Andre
A1  - Enculescu, Ion
T1  - Polymer-microporous host interactions probed by photoluminescence spectroscopy
N2  - Zeolites NaY and ZSM-5 were used as hosts for styrene polymerization after ion-exchange with europium ions. The parent and hybrid, polystyrene coated Eu-NaY (Eu-NaY/PS) and Eu-ZSM-5 (Eu-ZSM-5/PS) zeolites were investigated by using thermal analysis, SEM, PXRD, FT-IR, DR-UV/Vis, steady state and time-resolved photoluminescence spectroscopy. FT-IR spectra evidenced for the interaction between the zeolitic hosts and polystyrene while the PXRD spectra supported for the presence of the polymer inside the channels/pores of Eu-NaY/PS and Eu-ZSM-5/PS materials. The optical properties of Eu-NaY/PS and Eu-ZSM-5/PS were significantly changed relative to those of the parent zeolites, giving further evidence for the presence of polymer inside zeolites. An interesting case is presented by NaY zeolite: following styrene polymerization, the polymer interacted selectively with one of the two main species co-existing inside zeolite while for ZSM-5 a similar effect was not observed.
Y1  - 2010
UR  - http://www.rsc.org/Publishing/Journals/CP/index.asp
U6  - https://doi.org/10.1039/B922591a
SN  - 1463-9076
ER  - 
TY  - JOUR
A1  - Tiseanu, Carmen
A1  - Geßner, Andre
A1  - Kumke, Michael Uwe
A1  - Gagea, Bogdan
A1  - Parvulescu, Vasile Ion
A1  - Martens, Johan
T1  - Photoluminescence spectra and dynamics of lanthanide-doped microporous materials
N2  - A series of terbium- and europium-exchanged microporous-mesoporous zeolite Socony Mobil Five (MFI)-type materials such as Zeotile-1 and Zeogrid with varying Si/Al ratios was investigated using FTIR, PXRD, adsorption- desorption isotherms of N-2 at 77 K and time-resolved luminescence spectroscopy. Silylation of the lanthanides-exchanged Zeotile-1 and Zeogrid with hexadecyl trimethoxysilanes via post-synthesis grafting was also studied. The results showed that the lanthanide's photoluminescence spectra and decays were modified due to silylation. The different silylation effects in Zeotile-1 and Zeogrid were correlated with the textural properties of the investigated materials. (C) 2007 Elsevier B.V. All rights reserved.
Y1  - 2008
UR  - http://www.sciencedirect.com/science/article/pii/S0022231307003262
U6  - https://doi.org/10.1016/j.jlumin.2007.10.018
ER  - 
TY  - JOUR
A1  - Tiseanu, Carmen
A1  - Kumke, Michael Uwe
A1  - Parvulescu, Vasile Ion
A1  - Geßner, Andre
A1  - Gagea, Bogdan
A1  - Martens, Johan
T1  - Europium(3+) : an efficient luminescence probe for the Si to Al ratio and silylation effect in the microporous- mesoporous Zeogrid materials
Y1  - 2008
UR  - http://pubs.acs.org/doi/pdf/10.1021/jp711337h
U6  - https://doi.org/10.1021/Jp711337h
ER  - 
TY  - JOUR
A1  - Tiseanu, Carmen
A1  - Lorenz-Fonfria, Victor A.
A1  - Parvulescu, Vasile Ion
A1  - Geßner, Andre
A1  - Kumke, Michael Uwe
T1  - Photoluminescence study of terbium-exchanged ultrastable Y zeolites: Number of species, photoluminescence decays and decay-associated spectra
Y1  - 2008
UR  - http://scitation.aip.org/getpdf/servlet/ GetPDFServlet?filetype=pdf&id=JAPIAU000104000003033530000001&idtype=cvips&doi=10.1063/1.2966304&prog=normal
U6  - https://doi.org/10.1063/1.2966304
ER  -