Photofunctions of Dye-Clay Hybrids: Recent Developments

Yamaguchi, T.; Oh, Jae‐Min; Ogawa, Makoto

doi:10.1007/430_2020_53

Cited by 11 publications

(21 citation statements)

References 436 publications

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“…The capability of accommodating molecular guest species is worth investigating further, as motivated by the successful incorporation of perylene, a bulky aromatic molecule, with molecular-level dispersion (less aggregation probability) and enhanced stability of the dopant. Depending on the functions of dopants, various photochemical and optical functions may emerge as being done previously for organically modified clay minerals …”

Section: Resultsmentioning

confidence: 99%

“…In this study, a highly photoluminescent material is prepared by the incorporation of perylene molecularly in an inorganic–organic hybrids, organically modified layered materials. The concept of incorporating organic molecules in the hydrophobic nanospaces of organically modified natural clays has been used for many applications such as adsorbents and slow-release formulations, rheology controlling agents, pigments, polymer nanocomposites, and photofunctional materials, , Smectites, a group of layered clay minerals, modified with surfactants have been used to accommodate several photoluminescent aromatic molecules . Thanks to their swelling ability, smectite films can be fabricated by several approaches including layer-by-layer and LB methods .…”

Section: Introductionmentioning

confidence: 99%

“…The concept of incorporating organic molecules in the hydrophobic nanospaces of organically modified natural clays has been used for many applications such as adsorbents and slow-release formulations, 36 rheology controlling agents, 37 pigments, 38 polymer nanocomposites, 39 and photofunctional materials, 40,41 Smectites, a group of layered clay minerals, modified with surfactants have been used to accommodate several photoluminescent aromatic molecules. 41 Thanks to their swelling ability, smectite films can be fabricated by several approaches including layer-by-layer and LB methods. 42 The advantages of natural clay minerals are material variation and high crystallinity.…”

Section: Introductionmentioning

confidence: 99%

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Highly Luminescent Inorganic–Organic Hybrids with Molecularly Dispersed Perylene

Imwiset

Ogawa

2021

Inorg. Chem.

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A highly photoluminescent material was obtained by the incorporation of perylene into an inorganic−organic hybrid film. Octosilicate, a layered alkali silicate, was modified with a cationic surfactant, dioleyldimethylammonium ion, to accommodate perylene molecularly and uniformly. The perylene-doped dioleyldimethylammonium octosilicate films were fabricated by simply casting the toluene solution of perylene with dispersed dioleyldimethylammonium octosilicate on substrates. Near-unity photoluminescence quantum efficiency was achieved for hybrids containing a high concentration of perylene.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly Luminescent Inorganic–Organic Hybrids with Molecularly Dispersed Perylene

Imwiset

Ogawa

2021

Inorg. Chem.

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“…Accordingly, it is worth investigating to examine the molecular migration in various media with designed connection. The possibility of fabrication of mesoporous silicas and organophilic clays into films will be utilized to control the backward reaction further and to design photochromic devices.…”

Section: Resultsmentioning

confidence: 99%

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

2021

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Efficient negative photochromism was achieved by the photoinduced migration of merocyanine in mesoporous silica to an organophilic clay as spiropyran. Depending on the nature of the organophilic clays (dioctadecyldimethylammonium and dioleyldimethylammonium clays), important differences in the negative photochromisms and the thermal coloration were observed; the dioleyldimethylammonium clay gave a higher yield (98%) and faster reaction (half-life t 1/2 = 2.8 h) than the dioctadecyldimethylammonium clay (94% and t 1/2 = 3.2 h) of the negative photochromism, indicating the important role of the surfactant assembly to control the molecular diffusion.

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“…Using 1.80 PVP-SWF, the water-induced self-healing was followed by confocal microscopy. In order to visualize the sample, a fluorescent dye, R6G was adsorbed on SWF before the hybridization with PVP, taking advantage of the cation exchange capability of smectites for the functionalization. − The fluorescence images along the depth of the film (Z-stack image) are shown in Figure A. A green color (coming from the photoluminescence of R6G) was clearly seen along the healed area, indicating that both PVP and SWF were diffused together for the self-healing.…”

Section: Resultsmentioning

confidence: 99%

Composition-Dependent Thermal Stability and Water-Induced Self-Healing Behavior of Smectite/Waterborne Polymer Hybrid Film

Teepakakorn

Ogawa

2021

Langmuir

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By casting an aqueous suspension containing a watersoluble polymer, polyvinylpyrrolidone, and a layered silicate, synthetic hectorite, on the solid substrate, films with varied interlayer expansion were obtained depending on the composition. The thermal stability, water resistance, water-induced self-healing behavior, and adhesion were examined to find their composition dependence, which is thought to be originated from the nanostructure variation. Polyvinylpyrrolidone was thermally stable up to 300 °C for the hybrid with the polymer/clay weight ratio of 0.36 and 260 °C for the weight ratios of 1.08 and 1.80 as shown by the changes in the appearance and structure after heat treatment. The hybrid film with the polymer/clay ratio of 0.36 maintained the film shape when it was soaked in water for 24 h. The hybrids with the polymer/clay ratios of 1.08 and 1.80 were re-dispersed/dissolved into water after the immersion, while the water resistance of the films was enhanced by the thermal treatment at 200 °C for 2 h and showed very fast water-induced self-healing.

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Photofunctions of Dye-Clay Hybrids: Recent Developments

Cited by 11 publications

References 436 publications

Highly Luminescent Inorganic–Organic Hybrids with Molecularly Dispersed Perylene

Highly Luminescent Inorganic–Organic Hybrids with Molecularly Dispersed Perylene

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

Composition-Dependent Thermal Stability and Water-Induced Self-Healing Behavior of Smectite/Waterborne Polymer Hybrid Film

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