Effect of the layer charge on the interaction of porphyrin dyes in layered silicates dispersions

Čeklovský, A.; Czı́merová, Adriana; Lang, Kamil; Bujdák, Juraj

doi:10.1016/j.jlumin.2009.03.032

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…Although protonation of the adsorbed TMPyP molecules could also lead to spectral shifts, 64,65 we consider such a possibility unlikely because of the slight basicity of the dispersed medium (pH ϭ 7.5Ϫ8.5). 65 Under such experimental conditions TMPyP exists as a free base, bearing four positive charges at its N-methylated pyridine substituents. We further analyzed the interaction between TMPyP and RGO (eq 1) using the BenesiϪHildebrand method 66 where n denotes the average number of TMPyP molecules that interact with a single RGO sheet.…”

Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide and Porphyrin. An Interactive Affair in 2-D

2010

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Photoexcited cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin tetra(p-toluenesulfonate) (TMPyP) undergoes charge-transfer interaction with chemically reduced graphene oxide (RGO). Formation of the ground-state TMPyP-RGO complex in solution is marked by the red-shift of the porphyrin absorption band. This complexation was analyzed by Benesi-Hildebrand plot. Porphyrin fluorescence lifetime reduced from 5 to 1 ns upon complexation with RGO, indicating excited-state interaction between singlet excited porphyrin and RGO. Femtosecond transient absorption measurements carried out with TMPyP adsorbed on RGO film revealed fast decay of the singlet excited state, followed by the formation of a longer-living product with an absorption maximum around 515 nm indicating the formation of a porphyrin radical cation. The ability of TMPyP-RGO to undergo photoinduced charge separation was further confirmed from the photoelectrochemical measurements. TMPyP-RGO coated conducting glass electrodes are capable of generating photocurrent under visible excitation. These results are indicative of the electron transfer between photoexcited porphyrin and RGO. The role of graphene in accepting and shuttling electrons in light-harvesting assemblies is discussed.

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Section: Resultsmentioning

confidence: 99%

Reduced Graphene Oxide and Porphyrin. An Interactive Affair in 2-D

2010

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“…Among others, ion exchange and the partial negative surface charge have been considered the primary mechanisms of dye adsorption on MMT. It should be noted that the surface charge density of clay strongly determines how the dye will interact with the particles in terms of distribution and orientation on the surface [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Changes in Optical Properties upon Dye–Clay Interaction: Experimental Evaluation and Applications

2021

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The development of hybrid materials with unique optical properties has been a challenge for the creation of high-performance composites. The improved photophysical and photochemical properties observed when fluorophores interact with clay minerals, as well as the accessibility and easy handling of such natural materials, make these nanocomposites attractive for designing novel optical hybrid materials. Here, we present a method of promoting this interaction by conjugating dyes with chitosan. The fluorescent properties of conjugated dye–montmorillonite (MMT) hybrids were similar to those of free dye–MMT hybrids. Moreover, we analyzed the relationship between the changes in optical properties of the dye interacting with clay and its structure and defined the physical and chemical mechanisms that take place upon dye–MMT interactions leading to the optical changes. Conjugation to chitosan additionally ensures stable adsorption on clay nanoplatelets due to the strong electrostatic interaction between chitosan and clay. This work thus provides a method to facilitate the design of solid-state hybrid nanomaterials relevant for potential applications in bioimaging, sensing and optical purposes.

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“…It can be seen from the above results that the adjustment on the layer charge has a great effect on the system’s phase change temperature. The layer charge of clay turned out to be a very important parameter influencing the phase change behavior of SA, which is important for the construction of materials with modifiable energy storage properties, which are adjustable by the selection of an inorganic host template. − …”

Section: Resultsmentioning

confidence: 99%

Study on Controllable Assembly of Stearic Acid within Interlayer Spacing of Montmorillonite and Its Energy Storage Performance

Duan

Chen

et al. 2019

Langmuir

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As an energy carrier, the phase change material can enhance the efficiency of an energy source and reduce its load. The present paper describes the assembly of the energy carrier molecule [stearic acid (SA)] into the interlayer spacing of montmorillonite (Mt). A novel inorganic/organic composite energy storage material was prepared, which effectively reduces the phase change temperature of the energy storage molecule. Through acid treatment, the Si4+/Al3+ ratio of Mt can be regulated to obtain a series of Mts with different layer charges. As a result, a controllable assembly of energy storage molecule, SA, into the interlayer spacing of Mts with different layer charges was accomplished. By controlling the layer charges of Mt arrangement morphology and interactive force of SA molecules in the interlayer, spacing of Mt can be changed effectively. The phase change temperature (exothermic reaction) reduces from 50.5 to 32 °C compared with the SA molecules, which are used to control phase change temperature of the energy storage material. The study presents a SA/Mt energy storage material that can aid in further development in the field of energy storage construction materials.

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Effect of the layer charge on the interaction of porphyrin dyes in layered silicates dispersions

Cited by 15 publications

References 29 publications

Reduced Graphene Oxide and Porphyrin. An Interactive Affair in 2-D

Reduced Graphene Oxide and Porphyrin. An Interactive Affair in 2-D

Changes in Optical Properties upon Dye–Clay Interaction: Experimental Evaluation and Applications

Study on Controllable Assembly of Stearic Acid within Interlayer Spacing of Montmorillonite and Its Energy Storage Performance

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