Resonance energy transfer in the systems of smectite modified with a fluorescent cationic polymer and a photosensitizer

Kureková, Valéria; Belušáková, S.; Boháč, Peter; Bujdák, Juraj

doi:10.1016/j.clay.2019.105326

Cited by 9 publications

(13 citation statements)

References 44 publications

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“…The spectra of the films of both types functionalized with PhB consist of the main band at 556 nm, which corresponds to the π–π* transition, and a vibronic component at 525 nm of the dye. The absorption spectra of the films indicate that the spectral properties of PhB were only partially changed compared to the solution, and had similar properties to the films of hybrid materials based on Sap modified with a cationic polymer [ 41 ]. The Sap film and the corresponding organoclay were also measured as blank samples without PhB, and did not absorb light in the visible region.…”

Section: Resultsmentioning

confidence: 99%

“…The films were found to exhibit relatively strong fluorescence ( Figure 3 A). The emission wavelength shifted to partially higher wavelengths compared to the solution [ 50 ] and a similar Sap-based material modified with a cationic polymer [ 41 ]. Emission spectra were measured using excitation at different wavelengths (not shown) to verify whether the samples contained one or more fluorescent species.…”

Section: Resultsmentioning

confidence: 99%

“…As it has anionic functional groups, it does not adsorb on layered silicates directly. However, stable hybrid systems can be synthesized, starting from modified materials [ 41 ]. The objectives of this work included the preparation and characterization of so-called organoclays prepared by modifying Sap with quaternary alkylammonium cations and functionalizing it with PhB molecules.…”

Section: Introductionmentioning

confidence: 99%

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Physico-Chemical Characterization and Antimicrobial Properties of Hybrid Film Based on Saponite and Phloxine B

et al. 2021

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This research was aimed at the preparation of a hybrid film based on a layered silicate saponite (Sap) with the immobilized photosensitizer phloxine B (PhB). Sap was selected because of its high cation exchange capacity, ability to exfoliate into nanolayers, and to modify different surfaces. The X-ray diffraction of the films confirmed the intercalation of both the surfactant and PhB molecules in the Sap film. The photosensitizer retained its photoactivity in the hybrid films, as shown by fluorescence spectra measurements. The water contact angles and the measurement of surface free energy demonstrated the hydrophilic nature of the hybrid films. Antimicrobial effectiveness, assessed by the photodynamic inactivation on hybrid films, was tested against a standard strain and against methicillin-resistant bacteria of Staphylococcus aureus (MRSA). One group of samples was irradiated (green LED light; 2.5 h) and compared to nonirradiated ones. S. aureus strains manifested a reduction in growth from 1-log10 to over 3-log10 compared to the control samples with Sap only, and defects in S. aureus cells were proven by scanning electron microscopy. The results proved the optimal photo-physical properties and anti-MRSA potential of this newly designed hybrid system that reflects recent progress in the modification of surfaces for various medical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physico-Chemical Characterization and Antimicrobial Properties of Hybrid Film Based on Saponite and Phloxine B

et al. 2021

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“…The material was based on two antimicrobial components: a cationic surfactant (octadecyltrimethylammonium, ODTMA) used to modify the Sap particles and necessary to achieve compatibility with the polymer and the photosensitizer phloxine B (PhB). The properties of the precursor in the form of OC films with adsorbed PhB molecules have been tested in a recent study [22] and the effect and photoactivity of PhB as a part of other similar materials were confirmed in other works [23,24]. It is not expected that photooxidation of the surface by the photosensitizer should significantly alter the structure and antimicrobial properties of the composites.…”

Section: Introductionmentioning

confidence: 91%

Surface Characterization and Anti-Biofilm Effectiveness of Hybrid Films of Polyurethane Functionalized with Saponite and Phloxine B

et al. 2021

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The main objective of this work was to synthesize composites of polyurethane (PU) with organoclays (OC) exhibiting antimicrobial properties. Layered silicate (saponite) was modified with octadecyltrimethylammonium cations (ODTMA) and functionalized with phloxine B (PhB) and used as a filler in the composites. A unique property of composite materials is the increased concentration of modifier particles on the surface of the composite membranes. Materials of different compositions were tested and investigated using physico-chemical methods, such as infrared spectroscopy, X-ray diffraction, contact angle measurements, absorption, and fluorescence spectroscopy in the visible region. The composition of an optimal material was as follows: nODTMA/mSap = 0.8 mmol g−1 and nPhB/mSap = 0.1 mmol g−1. Only about 1.5% of present PhB was released in a cultivation medium for bacteria within 24 h, which proved good stability of the composite. Anti-biofilm properties of the composite membranes were proven in experiments with resistant Staphylococcus aureus. The composites without PhB reduced the biofilm growth 100-fold compared to the control sample (non-modified PU). The composite containing PhB in combination with the photodynamic inactivation (PDI) reduced cell growth by about 10,000-fold, thus proving the significant photosensitizing effect of the membranes. Cell damage was confirmed by scanning electron microscopy. A new method of the synthesis of composite materials presented in this work opens up new possibilities for targeted modification of polymers by focusing on their surfaces. Such composite materials retain the properties of the unmodified polymer inside the matrix and only the surface of the material is changed. Although these unique materials presented in this work are based on PU, the method of surface modification can also be applied to other polymers. Such modified polymers could be useful for various applications in which special surface properties are required, for example, for materials used in medical practice.

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“…Such composites can find applications in different research areas such as sensing [ 10 ] and photocatalysis [ 11 ] and have been exploited to improve the thermal [ 12 ], photochemical [ 13 ] and pH stability [ 14 , 15 ] of the incorporated dye [ 16 ]. Furthermore, different methods have been explored in order to increase the adsorption capacity of MMT particles such as calcination, ionic liquid/acidic treatment [ 17 , 18 ] or surface modification [ 19 , 20 ].…”

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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Resonance energy transfer in the systems of smectite modified with a fluorescent cationic polymer and a photosensitizer

Cited by 9 publications

References 44 publications

Physico-Chemical Characterization and Antimicrobial Properties of Hybrid Film Based on Saponite and Phloxine B

Physico-Chemical Characterization and Antimicrobial Properties of Hybrid Film Based on Saponite and Phloxine B

Surface Characterization and Anti-Biofilm Effectiveness of Hybrid Films of Polyurethane Functionalized with Saponite and Phloxine B

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

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