Unique photoactive nanocomposites based on rhodamine 6G/polymer/montmorillonite hybrid systems

Czı́merová, Adriana; Jankovič, Ľuboš; Madejová, Jana; Čeklovský, A.

doi:10.1002/polb.23382

Cited by 22 publications

(6 citation statements)

References 42 publications

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“…The basal spacings of PDDA-intercalated samples, reported in Table 1, show a shift from d 001 = 1.23 nm, characteristic of the sodium form of montmorillonite, to 1.46–1.56 nm, typical of PDDA-clay complex in which a single layer of polymer chains, adhering to the basal planes of montmorillonite, is formed [25,26,27]. The effect is associated with the 100% cationicity of PDDA, which causes strong attraction with clay layers and favors extended polymer conformation, with few loops and trains [26].…”

Section: Resultsmentioning

confidence: 99%

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PDDA-Montmorillonite Composites Loaded with Ru Nanoparticles: Synthesis, Characterization, and Catalytic Properties in Hydrogenation of 2-Butanone

et al. 2018

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The effect of synthesis parameters on the physicochemical properties of clay/ polydiallyldimethylammonium (PDDA)/Ru composites and their applicability in hydrogenation of 2-butanone under very mild conditions (room temperature, atmospheric pressure, and aqueous solution) was studied. Three synthetic procedures were employed, differing in the order of addition of components and the stage at which metallic Ru species were generated. The materials were characterized with XRD (X-ray diffraction), XRF (X-ray fluorescence), EDS (energy-dispersive spectroscopy), AFM (atomic force microscopy), TEM/HRTEM (transmission electron microscopy/high resolution transmission electron microscopy), and TG/DSC (thermal gravimetry/differential scanning microscopy techniques. The study revealed that the method of composite preparation affects its structural and thermal properties, and controls the distribution and size of Ru particles. All catalysts are active in hydrogenation of 2-butanone. For best catalytic performance (100% conversion within 30 min) both the size of Ru particles and the load of polymer had to be optimized. Superior catalytic properties were obtained over the composite with intermediate crystal size and intermediate PDDA load, prepared by generation of metallic Ru species in the polymer solution prior to intercalation. This method offers an easy way of controlling the crystal size by modification of Ru/PDDA ratio.

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Section: Resultsmentioning

confidence: 99%

“…In the Mt/PDDA_0.25 sample, loaded with the highest PDDA content employed in this work a shoulder at lower 2Θ appears, corresponding to ca. 1.9 nm interlayer distance, suggesting that a part of intercalated polymer forms a double layer [26,27].…”

Section: Resultsmentioning

confidence: 99%

PDDA-Montmorillonite Composites Loaded with Ru Nanoparticles: Synthesis, Characterization, and Catalytic Properties in Hydrogenation of 2-Butanone

et al. 2018

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“…In the present case the PDDA may play a similar role and may serve as a suppressing agent in preventing the undesired aggregation. A study of the effect of PDDA on the aggregation behaviour of R6G has been published elsewhere (Czímerová et al, 2013).…”

Section: Fluorescence Spectra Of Lbl Filmsmentioning

confidence: 99%

“…Saponite is suitable for preparing luminescent hybrid nanomaterials with desirable spectral characteristics. Moreover, the incorporation of saponite between the polymer layers is useful in terms of stabilizing the colloids against aggregation and adsorption (Czímerová et al, 2013).…”

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confidence: 99%

Resonance energy transfer between rhodamine dyes in saponite thin films: a step towards novel photofunctional nanohybrids

Czı́merová

Čeklovský

2017

Clay miner.

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Resonance energy transfer (RET) in hybrid polymer/inorganic/organic layers in saponite films, prepared using the ‘layer-by-layer’ (LBL) method, was studied. This method allows the fabrication of a multicomposite molecular assembly based on electrostatic and/or other intermolecular interactions between the interacting species. The LBL films were designed by sequential deposition including positively charged polycations ( poly(diallyldimethyl ammonium), PDDA) and negatively charged saponite dispersions with donor molecules (rhodamine 6G) and saponite dispersions with acceptor molecules (rhodamine 3B). In this sequence, the layer of saponite donor molecules was placed on an adjacent layer of saponite acceptor molecules, while the layers were separated by inserting a PDDA polycationic layer. The adsorption process was studied using absorption spectroscopy. The linear deposition regime was completed when ten layers had been deposited. The process of REF was studied by fluorescence spectroscopy. In this case the donor molecules – rhodamine 6G – play the role of lightharvesting antennae and transfer the energy to the next layer covered by energy acceptor, i.e. rhodamine 3B molecules. The insertion of polycation layers is rationalized by the adhesion of negatively charged underlying layers and the stabilization of multicomponent systems. The energy transfer efficiency was affected heavily by changing the distances between the adjacent layers.

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“…The optical properties of these materials often depend on humidity, which could be used for sensing applications. The other approaches included further components, such as polyelectrolytes (Czimerová et al, 2013) or molecular cavitands (Ishida et al, 2014;Matejdes et al, 2015) to avoid dye aggregation and improve photoactivity.…”

Section: P H E N O M E N a A N D P R O P E Rt I E S R E L At E D T O mentioning

confidence: 99%

Hybrid systems based on organic dyes and clay minerals: Fundamentals and potential applications

Bujdák

2015

Clay miner.

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This review summarizes several aspects of the interactions between organic dyes and clay minerals, and presents some interesting properties of hybrid materials based on these components. It explains the basic phenomena and photophysical properties of dye/clay mineral hybrid systems (DCHS) while examining the role of clay minerals in them. A brief history of using dyes as tools for clay research and on traditional materials based on DCHS is presented. Metachromasy, the phenomenon of colour change related to the formation of dye molecular aggregates is described in detail and analysed from various perspectives. The properties of DCHS, including photoactivity, luminescence, photocatalytic properties, optical anisotropy and non-linear optical properties are analysed in detail. Clay minerals often play a significant role in the occurrence of specific photophysical phenomena such as resonance energy transfer and luminescence quenching and may influence various reactions, such as conformational changes in dye molecules, photochromism, photoisomerization, photosensitization and other photochemical processes. Routes to synthesize various types of hybrid materials are also described here. The relevance of DCHS for clay research, chemistry and materials science is summarized briefly.

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Unique photoactive nanocomposites based on rhodamine 6G/polymer/montmorillonite hybrid systems

Cited by 22 publications

References 42 publications

PDDA-Montmorillonite Composites Loaded with Ru Nanoparticles: Synthesis, Characterization, and Catalytic Properties in Hydrogenation of 2-Butanone

PDDA-Montmorillonite Composites Loaded with Ru Nanoparticles: Synthesis, Characterization, and Catalytic Properties in Hydrogenation of 2-Butanone

Resonance energy transfer between rhodamine dyes in saponite thin films: a step towards novel photofunctional nanohybrids

Hybrid systems based on organic dyes and clay minerals: Fundamentals and potential applications

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