Optical and sensing features of TPPS4 J-aggregates embedded in Nafion® membranes: influence of casting solvents

Castriciano, Maria Angela; Carbone, A.; Saccà, A.; Donato, M. G.; Micali, Norberto; Romeo, Andrea; Luca, Giovanna De; Scolaro, Luigi Monsù

doi:10.1039/b924667c

Cited by 25 publications

(26 citation statements)

References 45 publications

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“…20 Castriciano et al found that TPPS can be easily anchored on Naon®. 21 These membranes exhibited interesting optical properties that strongly depended on the extent of TPPS aggregation and the organic solvent used. Our group has studied the adsorption properties and self-aggregation behavior of TPPS on the quaternized polysulfone membranes and found that J-aggregation can also occur on a cationic PSF membrane at pH 1.0.…”

Section: Introductionmentioning

confidence: 99%

“…The adsorption properties, the rejection performance, and the supramolecular aggregation behavior of TPPS on a pH-responsive blended membrane were studied. Porphyrin immobilization on this pH-responsive membrane could (i) lead to novel applications in smart membranes design, 21,32,33 (ii) provide additional methods for controlling TPPS aggregation state on the carriers, and (iii) achieve efficient use in the photoelectric and biochemical processes.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of a pH-responsive membrane carrier for meso-tetraphenylsulfonato porphyrin

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a pH-responsive membrane carrier for meso-tetraphenylsulfonato porphyrin

et al. 2017

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“…On the bases of the experimental evidences, we suggest that only EPA functionalized MWCNTs are able to trigger the TPPS aggregation process. This could be ascribable to the occurrence of an initial electrostatic interaction among a sufficient number of positively charged protonated amino groups on the CNTs surface and negatively charged sulfonated groups present in the periphery of the dyes [31,58]. Moreover, the observed red-shift of the extinction B-band of J-aggregates in the time On the other hand, upon the addition of the porphyrin to the MWCNT-EPA dispersion, the UV-Vis profile shows the spectral signatures both of the diacid form of TPPS (B-band at 434 nm) and of J-aggregates evidenced by their typical extinction band arising at 489 nm.…”

Section: Synthesis and Characterization Of Amine Multiwalled Carbon Nmentioning

confidence: 99%

Novel Nanohybrids Based on Supramolecular Assemblies of Meso-tetrakis-(4-sulfonatophenyl) Porphyrin J-aggregates and Amine-Functionalized Carbon Nanotubes

et al. 2020

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The ability of multiwalled carbon nanotubes (MWCNTs) covalently functionalized with polyamine chains of different length (ethylenediamine, EDA and tetraethylenepentamine, EPA) to induce the J-aggregation of meso-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) was investigated in different experimental conditions. Under mild acidic conditions, protonated amino groups allow for the assembly by electrostatic interaction with the diacid form of TPPS, leading to hybrid nanomaterials. The presence of only one pendant amino group for a chain in EDA does not lead to any aggregation, whereas EPA (with four amine groups for chain) is effective in inducing J-aggregation using different mixing protocols. These nanohybrids have been characterized through UV/Vis extinction, fluorescence emission, resonance light scattering and circular dichroism spectroscopy. Their morphology and chemical composition have been elucidated through transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). TEM and STEM analysis evidence single or bundles of MWCNTs in contact with TPPS J-aggregates nanotubes. The nanohybrids are quite stable for days, even in aqueous solutions mimicking physiological medium (NaCl 0.15 M). This property, together with their peculiar optical features in the therapeutic window of visible spectrum, make them potentially useful for biomedical applications.

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“…The fillers generally used for this purpose are composed of ceramic oxides or functionalized oxides, polymers with specific functional groups and organic compounds [14][15][16][17][18][19][20][21][22][23][24]. In this framework, the insertion of compounds or polymers containing nitrogenous groups, due to the ability of specific interactions/bonding with the sulfonic groups, is considered fruitful to reduce the swelling effect at high temperature and to improve the proton conductivity [25][26][27][28][29][30]. In a previous work, it was demonstrated that the insertion of 5,10,15,20-meso-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) into the high DS (>60%) membrane ionic domains shows improved performance in terms of proton conductivity and stability, with respect to the pristine polymeric matrix.…”

Section: Introductionmentioning

confidence: 99%

Novel Polymeric Composite TPPS/s-PEEK Membranes for Low Relative Humidity PEFC

et al. 2020

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Composite membranes based on different wt percentages of meso-tetrakis-(4-sulfonatophenyl)porphyrin (TPPS) embedded in a medium sulfonation degree (50%) sulfonated poly(etheretherketone) (s-PEEK) were investigated. The successful introduction of porphyrin into the membranes and the characterization of its different species into the membrane ionic domains were carried out by spectroscopic techniques. Moreover, the effect of TPPS arrangement was investigated in terms of water retention, proton conductivity and fuel cell performance at low relative humidity (RH). It was found that the introduction of this porphyrin induces a variation of the chemical-physical parameters, such as ion exchange capacity (IEC), water up-take (Wup %) λ and proton concentration ([H+]), attributable to the interactions that occur between the sulfonic groups of the polymer and the nitrogen sites of TPPS. The TPPS, in its J-aggregated form, actively participates in the proton conduction mechanism, also maintaining the adequate water content in more drastic conditions (80 °C and 50% RH). A maximum power density value of 462 mW cm−2 was obtained for the s-PEEK membrane, with a 0.77 wt % content of TPPS. This evidence suggests that the presence of J-aggregates in the proton conduction channels maintains a good hydration, even if a drastic reduction of the RH of the reactant gases occurs, preventing the membrane from a dry-out effect.

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Optical and sensing features of TPPS4 J-aggregates embedded in Nafion® membranes: influence of casting solvents

Cited by 25 publications

References 45 publications

Preparation and characterization of a pH-responsive membrane carrier for meso-tetraphenylsulfonato porphyrin

Preparation and characterization of a pH-responsive membrane carrier for meso-tetraphenylsulfonato porphyrin

Novel Nanohybrids Based on Supramolecular Assemblies of Meso-tetrakis-(4-sulfonatophenyl) Porphyrin J-aggregates and Amine-Functionalized Carbon Nanotubes

Novel Polymeric Composite TPPS/s-PEEK Membranes for Low Relative Humidity PEFC

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