Photoluminescence in non-conjugated polyelectrolyte films containing 7-hydroxy-flavylium cation

Estrada‐Montaño, Aldo S.; Espinobarro-Velázquez, Daniel; Sauzameda, Marysol; Terrazas, Estefanía; Reyes-Martínez, Reyna; Lardizabal, D.; Nevárez, Laura Alicia Manjarrez; Zaragoza-Galán, Gerardo

doi:10.1007/s00289-019-02975-w

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…New peaks at 351 and 420 cm −1 , assigned to the A 1g and E 2g photon modes of WS 2 , showed up in the Raman spectra of composite aerogels compared with pure CS, implying the presence of WS 2 nanosheets in hybrid aerogels (Figure S2). 19,20 The XRD diffraction patterns of composite aerogels displayed the characteristic layer-packing diffraction (002) of WS 2 at 14.4°, also indicating the presence of thinlayer WS 2 nanosheets in CS/WS 2 aerogels (Figure S3). 21 The potential interactions between chitosan and WS 2 nanosheets were studied by the FT-IR spectra and XPS of CS, WS 2 , and CS/WS 2 (x) aerogels.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

Co-Assembled WS₂ Nanosheets/Chitosan Aerogels with Oriented Micro-Channels for Efficient and Sustainable Solar Steam Generation

Yuan

Han

Cai

et al. 2023

ACS Sustainable Chem. Eng.

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Construction of anisotropic micro-channels in aerogel-based evaporators has been considered as a promising way to solve the salt accumulation and contaminant influence issues in the solar-driven interfacial evaporation process, however, which still suffer from drawbacks like costly fabrications. Herein, composite aerogels with anisotropic micro-channels were constructed through a simple co-assembly strategy between biomass chitosan and WS2 nanosheets. Ascribing to the synergetic effects of photothermal conversion capabilities of WS2 nanosheets and hydrophilia of chitosan, as well as the oriented microporous channels throughout the aerogels, the obtained aerogels (CS/WS2) exhibited a max evaporation rate of ∼2.10 kg m–2 h–1 and a conversion efficiency of ∼87.9% under 1 sun illumination and presented continuous production of clean water even in acidic, alkaline, and organic dye solutions and high-salinity brines. Thus, this study paves a novel and simple strategy to build anisotropic micro-channels in aerogel evaporators for efficient and sustainable solar evaporation and desalination.

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Section: ■ Results and Discussionmentioning

confidence: 96%

Co-Assembled WS₂ Nanosheets/Chitosan Aerogels with Oriented Micro-Channels for Efficient and Sustainable Solar Steam Generation

Yuan

Han

Cai

et al. 2023

ACS Sustainable Chem. Eng.

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“…Raman spectroscopy was performed for the extracted CMC and AgNPs@CMC materials ( Figure 4 ) in the range of 2000–50 cm −1 . There were two clear and intense peaks for the extracted CMC at ∼1395 cm −1 and 1710 cm −1 , which could be due to the in-plane (CH, OH) vibrations and ν(CO) vibrations [ 50 , 51 ]. The shift of the CO band could be attributed to the interaction of the polymeric chains [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

Carboxymethyl-Cellulose-Containing Ag Nanoparticles as an Electrochemical Working Electrode for Fast Hydroxymethyl-Furfural Sensing in Date Molasses

Alqahtani

Alnemr

Shulaybi³

et al. 2022

Polymers

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Novel biosensors based on carboxymethyl cellulose extract from date palm fronds containing Ag nanoparticles as an electrochemical working electrode for fast hydroxymethylfurfural (HMF) sensing in date molasses were prepared. The morphological, structural, and crystallinity characteristics of the prepared Ag@CMC were described via SEM, DLS, TEM, and XRD. In addition, Raman spectroscopy and UV–VIS spectroscopy were performed, and thermal stability was studied. The investigated techniques indicated the successful incorporation of AgNPs into the CMC polymer. The sensing behavior of the prepared AgNPs@CMC electrode was studied in terms of cyclic voltammetry and linear scan voltammetry at different HMF concentrations. The results indicated high performance of the designed AgNPs@CMC, which was confirmed by the linear behavior of the relationship between the cathodic current and HMF content. Besides, real commercial samples were investigated using the novel AgNPs@CMC electrode.

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“…This is achieved by incorporating them into natural polymer matrices, including chitosan, cellulose, agarose and starch, as well as synthetic matrices like dendrimers and hydrogels . These composite materials, comprising polymers and flavylium, are frequently used to create intelligent films. , Jordão et al reported a flavylium-supported stimuli-responsive polymer synthesized through direct radical polymerization of a flavylium-based vinyl monomer as the first example of covalent incorporation of flavyliums into polymers . This approach raises challenges such as polymer cross-linking and flavylium hydration, and as a result of these synthetic and processing conditions, only minimal incorporation (approximately 0.4%) of flavylium into the polymers was achieved …”

Section: Introductionmentioning

confidence: 99%

Flavylium-Containing Stimuli-Responsive RAFT Polymers: Synthesis and Enhanced Stability

Liu,

McDonald,

Thang

et al. 2024

Macromolecules

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Flavyliums are abundant naturally occurring, stimuli-responsive cationic chromophores found in anthocyanins that constitute the majority of red and blue pigments found in flora. While synthetic molecular derivatives have been devised to finetune these characteristics, the development of polymeric materials in this regard remains scarce. To address this, a flavylium-based methacrylamide derivative (FlavM-A1) was successfully synthesized, but its radical polymerization proved to be ineffective. To overcome this constraint, a convergent synthetic route for a series of flavylium-containing polymers was developed, employing reversible addition−fragmentation chain transfer (RAFT) polymerization followed by postmodification to install the flavylium chromophore. The flavylium-containing polymers described in this work exhibit improved hydrolytic stability in their flavylium moieties compared to the small-molecule FlavM-A1 while both possess interesting stimuli responsiveness and surfactant-like properties.

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Photoluminescence in non-conjugated polyelectrolyte films containing 7-hydroxy-flavylium cation

Cited by 6 publications

References 24 publications

Co-Assembled WS₂ Nanosheets/Chitosan Aerogels with Oriented Micro-Channels for Efficient and Sustainable Solar Steam Generation

Co-Assembled WS₂ Nanosheets/Chitosan Aerogels with Oriented Micro-Channels for Efficient and Sustainable Solar Steam Generation

Carboxymethyl-Cellulose-Containing Ag Nanoparticles as an Electrochemical Working Electrode for Fast Hydroxymethyl-Furfural Sensing in Date Molasses

Flavylium-Containing Stimuli-Responsive RAFT Polymers: Synthesis and Enhanced Stability

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Photoluminescence in non-conjugated polyelectrolyte films containing 7-hydroxy-flavylium cation

Cited by 6 publications

References 24 publications

Co-Assembled WS2 Nanosheets/Chitosan Aerogels with Oriented Micro-Channels for Efficient and Sustainable Solar Steam Generation

Co-Assembled WS2 Nanosheets/Chitosan Aerogels with Oriented Micro-Channels for Efficient and Sustainable Solar Steam Generation

Carboxymethyl-Cellulose-Containing Ag Nanoparticles as an Electrochemical Working Electrode for Fast Hydroxymethyl-Furfural Sensing in Date Molasses

Flavylium-Containing Stimuli-Responsive RAFT Polymers: Synthesis and Enhanced Stability

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Co-Assembled WS₂ Nanosheets/Chitosan Aerogels with Oriented Micro-Channels for Efficient and Sustainable Solar Steam Generation

Co-Assembled WS₂ Nanosheets/Chitosan Aerogels with Oriented Micro-Channels for Efficient and Sustainable Solar Steam Generation