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Polymerization time parameters, induction time t 0 and t 50 obtained from Boltzmann sigmoidal fitting, were determined from photorheology experiments performed on diacrylate and glycol dimethacrylate suspensions with silicon dioxide, with varying photoactives concentration and in the presence of diluents. The experiments were performed at the intensity ∼23mW/cm 2 . t 0...
This work reports on the synthesis of new coreshell quantum dots (QDs)-low symmetry phthalocyanines conjugates. The energy transfer from QDs (donor) to phthalocyanines (acceptor) was investigated when the two are mixed together or chemically linked to each other. Ti monocarboxy phthalocyanine QDs-linked and Sn monocarboxy phthalocyanine QDs-linked gave the smallest centre-to-centre separation distance...
Photosensitizers (PS) photodynamic activities are regulated by their location in the biological target, which modulates their photophysical and photochemical features. In this work the PS partition for the Xanthene Dyes Fluorescein (FSC), Eosin Y (EOS), Erythrosin B (ERY) and Rose Bengal B (RBB) in biomimetic models (SDS, CTAB and Pluronic P-123 micelles) and the effects on their photophysical characteristics...
Time-resolved emission techniques were employed to study the pressure effect on curcumin's luminescence in several aliphatic alcohols. We found that the hydrostatic pressure of up to 2GPa affects the decay rate of curcumin emission in the same way it affects the protonated form of many photoacids. We therefore propose that curcumin, which has two phenol groups, is a strong photoacid. Strong photoacids...
A spirooxazine dye has been doped in poly(methyl methacrylate) and ethyl cellulose nanoparticles by emulsion-solvent evaporation method. Tinuvin 144 hindered amine light stabilizer with an antioxidant moiety was selected as an efficient photostabilizer for improving the fatigue resistance of the two nanocomposite systems. Entrapment of the stabilizer practically did not increase the size of nanocapsules,...
In this study, we have synthesized conjugated n-type perylene tetracarboxylic diimide-based copolymer with 5,5′-bis(4-aminophenyl)-2-2′-bifuryl segment (PTCDI-PFDA) as an active material for the fabrication of bulk heterojunction photovoltaic device of type ITO/PEDOT:PSS/rr-P3HT:PTCDI-PFDA/Al. The synthesized n-type copolymer (an oligomer with a relatively low molecular weight) was characterized by...
A sensitive benzimidazole derivative fluorescent sensor for nanoparticulate ZnO has been designed and synthesized. The synthesized sensor emits fluorescence at 360nm and this fluorescence is selectively enhanced by nanocrystalline ZnO. This technique is sensitive to detect and estimate ZnO at micro molar level. Doping ZnO with Cu does not hamper the sensitivity but Ag-doping significantly reduces...
In this work, aza-boron-dipyrromethene (aza-BODIPY) compounds containing methoxy and hydroxy groups were synthesized. The effects of substitution and intramolecular charge transfer on linear and nonlinear optical absorptions (especially two photon absorption) of these BODIPY derivatives were investigated. Drastic spectral changes of aza-BODIPY compounds containing hydroxy group were observed in linear...
A class of dithienylethenes and its possible derivatives is explored with Density Functional Theory (DFT) and Time-Dependent DFT methods. After a comparison of different functional performances, 15 dithienylethenes have been submitted to calculation at the B1B95/6-311G(d,p) level in order to get further insights on the substitution impact on the energetic and optical properties of both isomers. Aromatic,...
New derivatives of pteridine, namely 6,7-diphenyl-2-morpholinylpterin (DMPT) and 6-thienyllumazine (TLM) were designed and easily synthesized in a rational way for pH-fluorescence sensing near physiological pH. The dual-excitation ratiometric sensing was based on the distinct spectral properties of the fluorophore in its neutral and deprotonated states. Density Functional Theory (DFT) calculations...
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