Layered Double Hydroxide Materials: Assembly and Photofunctionality

Tian, Rui; Yan, Dongpeng; Wei, Min

doi:10.1007/978-3-319-16991-0_1

Cited by 22 publications

(11 citation statements)

References 160 publications

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“…In sample A, the stretching vibration of NO 3 − anion is exhibited at around 1385 cm −1 which signifies presence of the same in the interlayer space, where as in case of sample B and C, small notches at 1362 and 1361 cm −1 , respectively, on the peak corresponding to NO 3 − anions (1385 cm −1 ), might be attributed to the presence of CO 3 2− anion. The absorption band in the broad range of 3400‐3600 cm −1 signifies the stretching vibration of labile hydroxyl group or physically adsorbed water molecule in all the samples A, B and C …”

Section: Resultsmentioning

confidence: 99%

“…anion. The absorption band in the broad range of 3400-3600 cm À1 signifies the stretching vibration of labile hydroxyl group or physically adsorbed water molecule in all the samples A, B and C. 33 Figure 4 exhibits the FESEM image of the sample C, comprising 43% of the CaCO 3 (both calcite and aragonite polymorphs) and 57% of CaAl-LDH, as above-mentioned, which has been corroborated by the morphological features of the precipitated phase through the obtained FESEM images. Figure 4A shows a low magnification image of the nanoparticles that predominantly comprises a combination of various morphological features.…”

Section: àmentioning

confidence: 94%

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pH‐dependent facile synthesis of CaAl‐layered double hydroxides and its effect on the growth inhibition of cancer cells

et al. 2018

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The present communication reports a pH‐dependent facile synthesis of calcium aluminum layered double hydroxide (CaAl‐LDH), at 3 different pH conditions of 8.5, 10.5 and 12.5 respectively, by simple coprecipitation route that led to the precipitation of the same in phase pure or in mixed phase form, and their detail characterization. Interestingly, at a pH of 8.5, the precipitate obtained was 100% phase pure CaAl‐LDH, represented as sample A, whereas, at higher pH conditions, a mixed phase comprising 37% of a combination of CaCO3 polymorphs, e.g., calcite and aragonite and 63% of the CaAl‐LDH (at pH 10.5, represented as sample B) and 43% of a combination of calcite and aragonite and the rest 57% being CaAl‐LDH (at pH 12.5, represented as sample C) respectively, were obtained. The increasing trend of the presence of carbonate anion (with reference to calcite and aragonite phases) was estimated by trace level ion‐exchange chromatography study using organic acid column. All the above samples were tested for their anticancer activity in vitro, using cancer cell lines, e.g., human colon carcinoma (HCT116) and human breast adenocarcinoma (MCF7). Interestingly, sample A only exhibited significant growth inhibition of the cancer cells as above‐mentioned. The observation as above was verified using human osteoblast precursor cells (MC3T3) as well, on which, all the samples (sample A, sample B and sample C) exhibited good cellular viability.

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Section: Resultsmentioning

confidence: 99%

Section: àmentioning

confidence: 94%

pH‐dependent facile synthesis of CaAl‐layered double hydroxides and its effect on the growth inhibition of cancer cells

et al. 2018

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“…In this study, we have achieved NIR-induced production of ultralong-lived triplet exciton through the generation of supramolecular photosensitizers with different aromatic RTP molecules that are confined in a 2D matrix. Layered double hydroxides (LDHs) were chosen as the 2D matrix due to their versatility in elemental composition, chemical stability, photostability, and superior biocompatibility 25 , 26 . These properties have also been studied in the fields of drug/gene delivery and bioinorganic composite materials 26 – 37 .…”

Section: Introductionmentioning

confidence: 99%

Nano-photosensitizer based on layered double hydroxide and isophthalic acid for singlet oxygenation and photodynamic therapy

et al. 2018

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Singlet oxygen has won a great deal of attention to catalysis and biological studies due to its strong oxidizing properties. However, the photosensitizers which require for the generation of singlet oxygen remain inadequate because of their lack of long-wavelength absorption, weak hydrophilicity, and poor biocompatibility. Here, we develop near-infrared laser activated supramolecular photosensitizers (isophthalic acid/layered double hydroxide nanohybrids) for efficient two-photon photodynamic therapy. The singlet oxygen quantum yield of nanohybrid is up to 0.74. Critically, in vitro tests verify the superior anti-cancer properties of nanohybrid with an IC50 determine to be 0.153 μg mL−1. The nanohybrids take advantage of the superior tissue penetration of 808 nm laser irradiation and exhibit a dramatically strong ability to ablate tumors in vivo, with extremely low toxicity. This work provides the proof of concept that ultralong-lived triplet excitons can function as two-photon-activated photosensitizers for an effective singlet oxygen generation.

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“…Immobilization of dyes on/in solids is a way to control the photochemical and photophysical properties of dyes, , and the resulting compounds can be regarded as a pigment, where the color is originated from the immobilized dye and tuned to some extent by the host–guest interactions. Inorganic nanoporous materials such as mesoporous silicas, zeolites, layered double hydroxides, and smectites , have been applied to host dyes, and the photofunctions of the resulting hybrids have been reported. Motivated by the outstanding stability of “Maya Blue”, which is a hybrid of a dye (indigo) and a clay mineral (palygorskite), , the preparation and the application of “Maya Blue”-type hybrid pigments composed of dyes and nanoporous solids have been studied for improving the stability. − Among available inorganic hosts, smectite is characterized by the expandable interlayer space and the possible organic modification to host various cationic and ionically neutral dyes.…”

Section: Introductionmentioning

confidence: 99%

Adsorption-Induced Dye Stability of Cationic Dyes on Clay Nanosheets

2018

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Rhodamine 6G (R6G) was adsorbed on smectite clays, a natural montmorillonite, a synthetic saponite, and synthetic hectorites, and the decolorization of the dyes upon visible light irradiation was examined for aqueous suspensions and cast films. Excellent dye stability was achieved when a natural montmorillonite was used. Apart from R6G, better photostability was also achieved when the tris(2,2′-bipyridine)ruthenium(II) complex was adsorbed on a natural montmorillonite. The excited state of the dye was quenched efficiently by the impurities in the natural montmorillonite. From the relationship between the excited-state quenching (as derived from photoluminescence quantum efficiency and photoluminescence intensity) and the decolorization rate constant, the quenching of the excited state of the dye adsorbed on the natural montmorillonite was proposed as the important mechanism for the stabilization of dyes upon photoirradiation.

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Layered Double Hydroxide Materials: Assembly and Photofunctionality

Cited by 22 publications

References 160 publications

pH‐dependent facile synthesis of CaAl‐layered double hydroxides and its effect on the growth inhibition of cancer cells

pH‐dependent facile synthesis of CaAl‐layered double hydroxides and its effect on the growth inhibition of cancer cells

Nano-photosensitizer based on layered double hydroxide and isophthalic acid for singlet oxygenation and photodynamic therapy

Adsorption-Induced Dye Stability of Cationic Dyes on Clay Nanosheets

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