Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Robson Valentim Pereira"'
Publikováno v:
Química Nova, Vol 29, Iss 6, Pp 1361-1364 (2006)
In this work we present the optogalvanic effect in ionized gases in an historical perspective. This effect was observed for the first time by Foote and Mohler in 1925, and explained by Penning in 1928 for mixtures (Ne-Ar) and pure gases (or vapours)
Externí odkaz:
https://doaj.org/article/d8caf51bd3ec416e9261d7ddb376d288
Autor:
Robson Valentim Pereira
Publikováno v:
Biblioteca Digital de Teses e Dissertações da USPUniversidade de São PauloUSP.
Neste trabalho, o corante 9-aminoacridina foi derivatizado com compostos vinílicos que possuem grupos retiradores de elétrons. A incorporação destes leva à mudanças nas propriedades fotofísicas dos derivados, tais como deslocamentos para regi
Autor:
Kênia da Silva Freitas, Robson Valentim Pereira, Aparecido Junior de Menezes, Marcelo A. Pereira-da-Silva, Thais Eugênio Gallina
Cellulose is considered one of the most important renewable sources of biopolymers on Earth. It has attracted widespread attention due to its physical–chemical characteristics, such as biocompatibility, low toxicity, biodegradability, low density,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4bedaa1a5e4375925b6dab3960c267c2
https://doi.org/10.5772/intechopen.96181
https://doi.org/10.5772/intechopen.96181
Autor:
Robson Valentim Pereira, Kênia da Silva Freitas, Aparecido Junior de Menezes, Thais Eugênio Gallina
Publikováno v:
O Conhecimento Científico na Química 2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eddb89296a0b2ece599446ebe359ee1b
https://doi.org/10.22533/at.ed.63120201121
https://doi.org/10.22533/at.ed.63120201121
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 198:69-74
Fluorescent probes derivated from auramine, 1-aminopyrene, and 9-aminoacridine containing a malononitrile group are copolymerized with methyl methacrylate. These new fluorescent polymeric materials are studied in solution of different solvents by ste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::25ab04dc10cfe711dbbba6480eebc25a
https://doi.org/10.1016/j.jphotochem.2008.02.017
https://doi.org/10.1016/j.jphotochem.2008.02.017
Publikováno v:
Macromolecules. 40:2219-2223
9-Aminoacridinium vinyl monomers with intramolecular charge transfer (ICT) state were studied as molecular probes for copolymerization with methacrylic acid. The fading of the dye color after its addition to the poly(methacrylic acid) (PMA) chain lea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ba8614aac467bcb1a00dbc3c94c79a1b
https://doi.org/10.1021/ma062020c
https://doi.org/10.1021/ma062020c
Autor:
Francisco Carlos Nart, P. Berci Filho, Eduardo Rezende Triboni, Marcelo Henrique Gehlen, Janildo Lopes Magalhães, Robson Valentim Pereira
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 183:165-170
The photophysical properties of N-methyl-1,8-naphthalimide (NI) and 4-phenoxy-N-methyl-1,8-naphthalimide (4-PNI) are studied by steady-state and time-resolved emission measurements. Both absorption and fluorescence spectra are red-shifted when the el
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6617531ec9c41d6dfa1b5e2b02754516
https://doi.org/10.1016/j.jphotochem.2006.03.012
https://doi.org/10.1016/j.jphotochem.2006.03.012
Publikováno v:
Chemical Physics Letters. 426:311-317
The electronic spectroscopy and photochemical properties of new derivatives of pyrene-1-aminovinylene containing strong electron withdrawing groups are reported. 2-((Pyren-8-ylamino)methylene) malononitrile (I) ethyl 2-cyano-3-(pyren-8-ylamino) acryl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ffae4e52977bc70926c57f33491ff1c
https://doi.org/10.1016/j.cplett.2006.05.109
https://doi.org/10.1016/j.cplett.2006.05.109
Autor:
Robson Valentim Pereira, Tania Maria Haas Costa, Marcia Russman Gallas, Valter Stefani, Marcelo Henrique Gehlen
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 181:147-151
The cationic dyes 9-amino acridine (9AA) and auramine were incorporated into silica matrix by sol–gel method, producing transparent monoliths. These fluorochromic materials were converted into powder and compacted at room temperature at 6 GPa to fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::37c6d6e87636215f729477ed412e578a
https://doi.org/10.1016/j.jphotochem.2005.11.017
https://doi.org/10.1016/j.jphotochem.2005.11.017
Publikováno v:
The Journal of Physical Chemistry B. 110:6537-6542
Auramines containing a vinyl group with strong electron-withdrawing substituent exhibit a pi-conjugated extended effect that gives a red shift in their absorption and emission bands. The new fluorochromic dyes were bound to poly(methacrylic acid) (PM
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f22960bf1655e3958cb44edaf81828ab
https://doi.org/10.1021/jp054833t
https://doi.org/10.1021/jp054833t