B. Ren et al., Confocal microprobe Raman spectroscopy for investigating the aggregation process at the liquid/air interface, CHEM P LETT, 328(1-2), 2000, pp. 17-22
The unique advantage of confocal microprobe Raman spectroscopy was used to
study the aggregation process of tetrakis (p-sulfonatophenyl) porphyrin (TS
PP) occurring at the liquid/air interface. For the low ionic strength solut
ion, very strong Raman signals of aggregates from the liquid/air interface
were detected while those were absent in the bulk solution. This is attribu
ted to the increase of the interfacial concentration of aggregates and the
assistance of the resonance Raman effect. For higher ionic strength solutio
ns, a strong resonance Raman signal can be detected from both phases with d
ifferent features which could be due to the formation of larger aggregates.
(C) 2000 Published by Elsevier Science B.V.