Luminescence of a laser dye in organically-modified layered silicate pigments

Barlog, Martin; Pálková, Helena; Bujdák, Juraj

doi:10.1016/j.dyepig.2021.109380

Cited by 10 publications

(8 citation statements)

References 42 publications

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“…XRD patterns (Figure a) of MMT exhibited typical hkl peaks of smectites, and the basal spacing is 1.27 nm, which is a characteristic d value for Na-montmorillonite. SAP showed a wider XRD pattern indicating low crystallinity and small particle size (Figure b) . MMT showed well-developed 001 diffraction due to its higher crystallinity than SAP .…”

Section: Resultsmentioning

confidence: 98%

Controlling the Fluorescence Behavior of Hydrophobic Pigments by Supramolecular Self-Assembling on Organic Layered Silicate Minerals

Ding,

Liao,

Shuai

et al. 2023

Inorg. Chem.

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This research focused on the supramolecular selfassembly of organic fluorescent molecules on organically modified layered silicate minerals to design and prepare layered nanocomposites with excellent fluorescence properties. Aromatic hydrocarbons are hydrophobic and poorly loaded on the hydrophilic surface of layered silicate minerals, but they are easily captured by an organically modified mineral surface. Montmorillonite (MMT) and saponite (SAP), typical 2:1 type layered silicate minerals with different octahedral cations, were modified with the cationic surfactant octadecyl trimethylammonium chloride (OTAC) and loaded with pyrene (an aromatic hydrocarbon dye) with different molar ratios to the cationic surfactant by supramolecular self-assembling to construct fluorescent nanocomposites. The effect of pyrene concentration and the octahedral cation of the 2:1 type layered silicate minerals on photoluminescence properties was investigated. The fluorescence spectra of the nanocomposites prepared under low pyrene concentrations showed two bands at around 400 and 470 nm, corresponding to the monomer and excimer emissions; the band intensity of the excimer shoots up with the increase of pyrene concentration, reflecting different contributions from monomer and dimer species and the formation of radical aggregates. The excellent heat resistance of the layered silicate structure can effectively protect pyrene molecules from external environmental influences.

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Section: Resultsmentioning

confidence: 98%

Controlling the Fluorescence Behavior of Hydrophobic Pigments by Supramolecular Self-Assembling on Organic Layered Silicate Minerals

Ding,

Liao,

Shuai

et al. 2023

Inorg. Chem.

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“…A radical decrease in fluorescence followed by a regular shift of the emission maximums to higher wavelengths occurred with a further increase in dye concentration (MB6-MB10). These phenomena can be attributed to the concentration quenching caused by the migration and transfer of excitation energy, part of which ended up in inactive molecular aggregates [ 38 ]. Overall, the samples with low to medium dye concentrations (MB4 and MB5) exhibited optimal fluorescence properties.…”

Section: Resultsmentioning

confidence: 99%

Modified Polymer Surfaces: Thin Films of Silicate Composites via Polycaprolactone Melt Fusion

Skoura

Boháč

Barlog

et al. 2022

IJMS

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Polymer/layered silicate composites have gained huge attention in terms of research and industrial applications. Traditional nanocomposites contain particles regularly dispersed in a polymer matrix. In this work, a strategy for the formation of a composite thin film on the surface of a polycaprolactone (PCL) matrix was developed. In addition to the polymer, the composite layer was composed of the particles of saponite (Sap) modified with alkylammonium cations and functionalized with methylene blue. The connection between the phases of modified Sap and polymer was achieved by fusing the chains of molten polymer into the Sap film. The thickness of the film of several μm was confirmed using electron microscopy and X-ray tomography. Surfaces of precursors and composite materials were analyzed in terms of structure, composition, and surface properties. The penetration of polymer chains into the silicate, thus joining the phases, was confirmed by chemometric analysis of spectral data and changes in some properties upon PCL melting. Ultimately, this study was devoted to the spectral properties and photoactivity of methylene blue present in the ternary composite films. The results provide directions for future research aimed at the development of composite materials with photosensitizing, photodisinfection, and antimicrobial surfaces.

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“…Molecular aggregation poses a certain risk related to the loss or at least a decrease in photoactivity. For instance, the presence of the previously mentioned H-aggregates, molecular assemblies of a sandwich-type structure, can lead to a substantial quenching of luminescence . Therefore, with respect to the development of highly photoactive applications, these types of interfacial molecular aggregates could be considered as undesirable products of the adsorption of dyes on the silicate surface …”

Section: Discussionmentioning

confidence: 99%

“…In this way, it is possible to achieve the adsorption of even anionic or neutral chromophores. − Using the modification of silicates with oppositely charged polyelectrolyte or surfactant molecules, it is possible to tune the surface charge of silicates . In addition to the regulation of their charge, hydrophilic vs hydrophobic properties of the silicate surfaces can also be controlled by the adsorption of surfactants. , …”

Section: Discussionmentioning

confidence: 99%

“…There are various possible approaches to achieve this goal, which are directly related to the strategies of the synthesis and that of the design of the hybrid materials as reviewed recently in ref . One of the frequently used solutions is the already mentioned selection of a suitable silicate with properties supporting dye adsorption in the form of monomers or photoactive J-aggregates. − Another option is the manipulation of the conditions for the synthesis of such heterogeneous systems, which in some cases effectively prevent or at least reduce the degree of molecular aggregation . If in certain cases this would not be sufficient, it would be possible to proceed with strategies aimed at the chemical modification of the silicate surface.…”

Section: Discussionmentioning

confidence: 99%

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Adsorption of Dye Molecules and Its Potential for the Development of Photoactive Hybrid Materials Based on Layered Silicates

et al. 2023

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The present paper gives a brief account of the latest advances in understanding of the mechanism and implications of dye adsorption with a special focus on layered silicate surfaces. It has been clearly demonstrated that the controlled adsorption of novel or already well-known dyes has equally great yet unexplored potential. In principle, the well-engineered surface confinement of the molecules may lead to their aggregation, adsorption, or intercalation-induced fluorescence emission even with conventional dyes, which are not considered as luminophores in solutions or in the solid state. We envision the utilization of silicate-based heterogeneous systems to produce novel polymer blended films or structured liquids, as well as to develop a plethora of other photophysical and biomedical applications.

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Luminescence of a laser dye in organically-modified layered silicate pigments

Cited by 10 publications

References 42 publications

Controlling the Fluorescence Behavior of Hydrophobic Pigments by Supramolecular Self-Assembling on Organic Layered Silicate Minerals

Controlling the Fluorescence Behavior of Hydrophobic Pigments by Supramolecular Self-Assembling on Organic Layered Silicate Minerals

Modified Polymer Surfaces: Thin Films of Silicate Composites via Polycaprolactone Melt Fusion

Adsorption of Dye Molecules and Its Potential for the Development of Photoactive Hybrid Materials Based on Layered Silicates

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