Solid-state fluorescence study of naphthalene adsorption on porous material.
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 (I(excimer)/I(monomer)) 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.
Tozuka
Yuichi
Y
Graduate School of Pharmaceutical Sciences, Chiba University, 1-33 Yayoicho, Inage-ku, Chiba, 263-8522, Japan. ytozuka@p.chiba-u.ac.jp
Tashiro
Emi
E
Yonemochi
Etsuo
E
Oguchi
Toshio
T
Yamamoto
Keiji
K
D000327:Adsorption; D002482:Cellulose / Q000737:chemistry*; D003460:Crystallization; D009281:Naphthalenes / Q000737:chemistry*; D016062:Porosity; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods; D013499:Surface Properties; D013997:Time Factors
D009281:Naphthalenes; C031721:naphthalene; D002482:Cellulose