title: Light scattering enhancement in an aqueous solution of spermine-induced fractal -aggregate composite.
abstract: We performed an experimental investigation on the scattering and extinction properties of an aqueous solution of spermine-induced fractal J aggregates, constituted by porphyrin molecules. In analogy with nanostructured particle composites, the dipolar moments of different porphyrins, not belonging to the aggregates J, are coupled and generate a strong light scattering enhancement. Both the enhanced scattered intensity and the imaginary part of the polarizability of the system obey scaling laws with the optical spectral dimension d0=0.3.
authors.affiliation: CNR, Istituto per i Processi Chimico-Fisici, sezione Messina, Via La Farina 237, I-98123 Messina, Italy. micali@me.cnr.it
authors.forename: Norberto
authors.initials: N
authors.lastname: Micali
authors.forename: Valentina
authors.initials: V
authors.lastname: Villari
authors.forename: Luigi Monsù
authors.initials: LM
authors.lastname: Scolaro
authors.forename: Andrea
authors.initials: A
authors.lastname: Romeo
authors.forename: Maria Angela
authors.initials: MA
authors.lastname: Castriciano
mesh_terms: D003198:Computer Simulation; D003460:Crystallization / Q000379:methods; D017709:Fractals; D008027:Light; D008956:Models, Chemical; D009391:Nephelometry and Turbidimetry / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D012996:Solutions; D013096:Spermine / Q000032:analysis / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D012996:Solutions; D014867:Water; D013096:Spermine