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Solid-State Fluorescence Study of Naphthalene Adsorption on Porous Material

2002; Elsevier BV; Volume: 248; Issue: 2 Linguagem: Inglês

10.1006/jcis.2001.8142

1095-7103

Yuichi Tozuka, Emi Tashiro, Etsuo Yonemochi, Toshio Oguchi, Keiji Yamamoto,

Microfluidic and Capillary Electrophoresis Applications

Naphthalene adsorption profile on porous materials was studied using solid-state fluorescence spectroscopy. When naphthalene crystals were simply mixed with porous crystalline cellulose (PCC), excimer emission of naphthalene was observed after 1 min of mixing, suggesting a drastic change in the naphthalene molecular environment during the mixing procedure. For the naphthalene–octadesyl silane (ODS)-80A or naphthalene–ODS-2 systems, the changes in adsorption profiles and fluorescence spectral pattern of naphthalene were similar to those of the naphthalene–PCC system. The final amounts of naphthalene adsorbed to ODS-80A and ODS-2 were 0.05 and 0.024 g/g adsorbent, respectively, even though the two materials had comparable values of specific surface area. The relative emission intensity (Iexcimer/Imonomer) in the ODS-80A system was higher than that in the ODS-2 system when compared at the same amount of naphthalene adsorbed. It was concluded that the pore size of porous materials affected the naphthalene excimer formation on the surface.