Actas de congresos
Particle And Polymer Microchemistry And Electric Domain Mapping
Registro en:
Molecular Crystals And Liquid Crystals Science And Technology Section A: Molecular Crystals And Liquid Crystals. , v. 374, n. , p. 159 - 166, 2002.
1058725X
10.1080/10587250210445
2-s2.0-10844268235
Autor
Galembeck F.
Do Carmo M.
Da Silva V.M.
Leite C.A.P.
Costa C.A.R.
Galembeck A.
Institución
Resumen
New microscopy techniques are increasing accessible, yielding hitherto unavailable information on the spatial distribution of chemical constituents in sub-micron and nanosized particles, as well as in polymer films and other materials; this work describes four relevant examples. First, elemental distribution maps of a polystyrene latex obtained by electron spectroscopy coupled to transmission microscopy (ESI-TEM) show that particle C/S ratio is highly variable, evidencing the large differences in polymer Mw's, in different particles. Second, electric potential maps of latex macrocrystals obtained by scanning electron potential microscopy (SEPM) show negative large islands dispersed in a positive continuum, with large electric potential gradients. Backscattered electron imaging (BEI) evidences a core-and-shell structure of silica particles: the particles are made out of smaller domains with variable average atomic number, concentrated at the particle outer layers. The fourth example is a complex columnar structure of electric domains, in crystalline alumina, obtained by SEPM. 374
159 166 Galembeck, F., Souza, E.F., (1999) Polymers Interfaces and Emulsions, , K. Esumi, M. Dekker: New York Cardoso, A.H., Leite, C.A.P., Galembeck, F., (1998) Langmuir., 14, p. 3187 Terris, B.D., Sterm, J.E., Rugar, D., Mamin, H.J., (1990) J. Vac. Sci. Technol., A, 8, p. 374 Goldstein, J.I., Newbury, D.E., Echlin, P., Rimig Jr., D.C., Lyman, C.E., Fiori, C., Lifshin, E., (1992) Scanning Electron Microscopy and X-ray Microanalysis, , New York: Plenum Braga, M., Costa, C.A.R., Leite, C.A.P., Galembeck, F., (2001) J. Phys. Chem. B, 15, p. 3005 Galembeck, A., Costa, C.A.R., Da Suva, M.C.V.M., Souza, E.F., Galembeck, F., (2001) Polymer, 11, p. 4845 Leite, C.A.P., De Souza, E.F., Galembeck, F., (2001) Jornal of the Brazilian Chemical Society, 12, p. 519 Costa, C.A.R., Leite, C.A.P., De Souza, E.F., Galembeck, F., (2001) Langmuir, 17, p. 189