Photoisomerization-induced morphology and transparency transition in an azobenzene based two-component organogel system

Cao, Xinhua; Li, Xue; Chen, Liming; Mao, Yueyuan; Lan, Haichuang; Yi, Tao

doi:10.1016/j.jcis.2015.07.047

Cited by 18 publications

(4 citation statements)

References 35 publications

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“…The unique optical phenomenon from transparency to whiteness is a bountiful source of inspiration for researchers to explore hydrochromic materials. [1][2][3][4][5] The transition from high transparency to opaque whiteness is achieved by the light scattering principle. [6] Moreover, the reversible color transition phenomenon of the light scattering effect tuned by environmental humidity inspired the creation of intelligent hydrochromic polymers.…”

Section: Introductionmentioning

confidence: 99%

Fast Response and Visual Transparency Switching Hydrochromic Film Based on the Rational Structure of Cellulose/Poloxamer Copolymers Design for Smart Window

Guo

Qian

2023

Macromol. Rapid Commun.

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The authors are motivated to develop a series of hydrochromic copolymers with fast response, reversibility, repeatability, and visual transparency transition. The hydrochromic block copolymers are based on the rational ratio of hydrophilic segments of poloxamer block and hydrophobic segments of ethyl cellulose according to the preparation method of polyurethane. By tuning the ratio of hydrophilic segments or adding hygroscopic salts, the hydrochromic polymer is endowed with the ability to visualize the transparency in response to the relative humidity. Especially, the response time of the polymer is extremely shortened, up to 1 s for the optimized sample. Within the moisture stimulation, the hygroscopic swelling increases the film thickness, leading to a reversible transparency switching from a highly transparent state (82%) to an opaque white state (20.5%).

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Section: Introductionmentioning

confidence: 99%

Fast Response and Visual Transparency Switching Hydrochromic Film Based on the Rational Structure of Cellulose/Poloxamer Copolymers Design for Smart Window

Guo

Qian

2023

Macromol. Rapid Commun.

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“…For example, the morphology of phenylalanine-substituted cholic acid has been reported to show narrow surfactant nanotubes at pH = 1.1, but small micelles at pH = 10.0 [8]. The structure and transparency of a two-component organogel could be reversibly changed by alternative UV light irradiation [9]. Another simple and effective stimulus is regulating temperature due to that the noncovalent interactions (e.g., hydrogen bonding, π-π stacking, van der Waals interactions) can be largely affected by temperature [10].…”

Section: Introductionmentioning

confidence: 99%

Using a solvent-induced self-assembly approach to fabricate and tune the organogels and hydrogels

Wang,

Hao,

Yang

2023

Colloid Polym Sci

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In the present work, stable organogels and hydrogels could be formed by dimeric-dehydrocholic acid derivative (DDAD) in different solvents. Compared with the organogels, the hydrogels formed by DDAD were found to be thermal reversible and had higher gel-to-solution transition temperature. The supramolecular structures in the organogels and hydrogels were further studied by using transmission electron microscopy (TEM) and atomic force microscopy (AFM). TEM and AFM images of the supramolecular gels showed that the solvent effects played a crucial role in morphological structures.Speci cally, the organogel had a three-dimensional porous network structure. While, the hydrogel had a supramolecular structure made up of long bers. Fourier transformation infrared spectroscopy (FT-IR) showed that multiple hydrogen bonds among the gelator molecules were the main driving forces in gel formation. On this base, the solvent effects on the gelation abilities and thermal stability were discussed.Thus, the present study provides a solvent-induced self-assembly approach and contributes substantially to the development of the supramolecular gels as soft materials.

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“…Similarly, adjusting alkyl group placement from para- to meta-substitution resulted in a measurable increase in PCE for an INCN-functionalized NFA used in polymer solar cells . Certainly, the links between molecular structure and thin-film morphology are understood to have an important impact on the optical properties and optoelectronic performance of organic-based devices; − however, it is also well-accepted that controlling solid-state organization remains an interesting challenge. − At the same time, photoisomerization is known to result in appreciable changes in solid-state morphology characteristics, − which in turn can have concomitant impacts on downstream optical and electronic properties critical to OPV device performance.…”

Section: Introductionmentioning

confidence: 99%

Thin-Film Morphology and Optical Properties of Photoisomerizable Donor–Acceptor Oligothiophenes

Camero

Grinalds

Kornman

et al. 2022

ACS Appl. Mater. Interfaces

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It was recently reported that the most popular electron-accepting units introduced to π-conjugated oligomers studied for organic photovoltaic applications are susceptible to unwanted and even destructive photochemical reactions. The consequences of Z/E photoisomerization of the popular 2-(1,1dicyanomethylene)rhodanine (RCN) unit on the optical and morphological properties of a homologous series of RCNfunctionalized oligothiophenes are studied here. Oligomers consisting of one, two, or three thiophene units were studied as pure Z isomers and with E isomer compositions of 25, 53, and 45%, respectively, for Z/E mixtures. Solutions of Z isomers and Z/E mixtures were characterized by UV−vis and photoluminescence spectroscopy, wherein changes to optical properties were evaluated on the basis of E isomer content. X-ray diffraction of thin-film Z/E mixtures reveals crystalline domains of both Z and E forms after thermal annealing for mono-and bithiophene oligomers, with greater interplanar spacing for E crystalline domains than the Z counterparts along the substrate normal direction. The surface morphology viewed by atomic force microscopy also shows fiberlike structures for the E form with a much larger aspect ratio than for the Z domains in the bithiophene oligomer. Optical characterization reveals drastic changes in the solid state upon introduction of the E form for the mono-and bithiophene derivatives, whereas subtle consequences are noted for the terthiophene analogue. Most notably, a 132 nm redshift in maximum absorption occurs for the bithiophene oligomer films containing 53% E isomer compared to the pure Z counterpart. Finally, although solid-state photoisomerization experiments find no evidence of Z → E isomerization in polycrystalline Z films, E → Z isomerization is observed and becomes more restrictive in films with higher crystallinity (i.e., after thermal annealing). This structure−property study, which elucidates the consequences of the RCN configuration on solid-state packing and optical properties, is expected to guide the development of more efficient and stable organic optoelectronic devices.

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Photoisomerization-induced morphology and transparency transition in an azobenzene based two-component organogel system

Cited by 18 publications

References 35 publications

Fast Response and Visual Transparency Switching Hydrochromic Film Based on the Rational Structure of Cellulose/Poloxamer Copolymers Design for Smart Window

Fast Response and Visual Transparency Switching Hydrochromic Film Based on the Rational Structure of Cellulose/Poloxamer Copolymers Design for Smart Window

Using a solvent-induced self-assembly approach to fabricate and tune the organogels and hydrogels

Thin-Film Morphology and Optical Properties of Photoisomerizable Donor–Acceptor Oligothiophenes

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