Layered macrocycles with flexibility and tunable dynamic properties for wide-range thermoresponsive color changes

Shioda, Nano; Heo, Jung-Moo; Kim, Bubsung; Imai, Hiroaki; Kim, Jong-Man; Oaki, Yuya

doi:10.1039/d1sd00024a

Cited by 7 publications

(7 citation statements)

References 66 publications

(72 reference statements)

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“…Our previous work showed that the intercalation of the guest molecules formed the topochemically polymerizable layered structure by shortening the distance between the DA moieties through the conformational changes (Figure 1b). [ 47 ] However, the exfoliation was not studied in the previous work. Here 2‐methoxybenzylamine (2‐OMe‐BA) was used as a guest.…”

Section: Resultsmentioning

confidence: 99%

Nanoarchitectonics of Exfoliated Flexible Nanosheet Based on Laterally Stacked Macrocycles

Shioda,

Heo,

Kim

et al. 2023

Adv Materials Inter

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Abstract2D nanostructures including monolayers and few layers exhibit unique properties originating from the anisotropic ultrathin nature. Conventional organic 2D nanostructures, such as covalent organic frameworks, are comprised of the planar π‐conjugated macromolecules linked and extended parallel to the layers. The present work shows a new type of exfoliated organic 2D material. The macrocycles are stacked perpendicular to the lateral direction of the nanosheets. Self‐assembly of a designed macrocyclic diacetylene monomer with a chair conformation forms the laminated structures containing the layers based on the perpendicularly arranged macrocycles. The exfoliable layered structures are obtained by the topochemical polymerization of the diacetylene moieties. The intercalation and subsequent swelling provide the nanosheets based on the laterally stacked macrocycles in aqueous phase. The colloidal nanosheets possess structural flexibility with the molecular motions originating from the ultrathin nature and conformational diversity. The hydrogel cross‐linked with the flexible nanosheets exhibits unique stretching and thermoresponsive shrinking properties. The present work implies the potential of the flexible 2D materials based on the macrocycles.

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Section: Resultsmentioning

confidence: 99%

Nanoarchitectonics of Exfoliated Flexible Nanosheet Based on Laterally Stacked Macrocycles

Shioda,

Heo,

Kim

et al. 2023

Adv Materials Inter

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“…PDA can be easily coated on a variety of substrates, such as paper, glass, and polymer substrates. 48,55,56,[59][60][61] We have developed the coating methods, such as deposition from the solution phase, 59 dipping in the precursor solution, 48,55,56 precipitation from the colloidal liquid, 60 and spraying of the precursor solution, 61 in previous works. Moreover, the stimuli responsivity was tuned by the intercalated guests in the interlayer space.…”

Section: Discussionmentioning

confidence: 99%

A highly sensitive friction-imaging device based on cascading stimuli responsiveness

et al. 2023

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“…Stimuli-responsive color-change properties of PDA have been applied to the development of sensing materials. − In general, the self-organized structures of DA monomers, such as vesicles and layered structures, provide PDA through the topochemical polymerization with the irradiation of UV light when the distance between the DA moieties is shorter than 0.5 nm in the condensed states . Molecular design, such as changes in the functional groups, chain lengths, and molecular shapes, has been studied in previous works. − However, the structural flexibility sufficient to enhance the dynamic properties with molecular motion is not easily achieved by the topochemically polymerizable self-organized structures containing the densely packed molecules. New approaches that are alternatives to typical molecular design are required to achieve both formation of the self-organized structures and enhancement of the dynamic properties.…”

Section: Introductionmentioning

confidence: 99%

Coatable 2D Conjugated Polymers Containing Bulky Macromolecular Guests for Thermal Imaging

Edagawa

Matsuda

Kawakubo

et al. 2022

ACS Appl. Mater. Interfaces

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Dynamic properties are derived from the structural flexibility of 2D polymers. Softening layered structures has the potential for tuning and enhancing the dynamic properties. In the present work, the flexibility of layered polydiacetylene (PDA) is tuned by the interlayer polymeric guests with different branching structures. PDA shows thermoresponsive color-change properties through shortening the effective conjugation length with molecular motion. Whereas the blue-to-red color transition is observed at certain threshold temperatures for the layered PDA without the interlayer guest, the intercalation of the bulky polymer guests lowers the starting temperature and widens the temperature range for the thermoresponsive color changes. The resultant layered composite of PDA and bulky polymer affords the homogeneous coating on substrates on the centimeter scale. The thermoresponsive color-change coating is applied to temperature-distribution imaging. The specific heat of liquids is colorimetrically estimated using the coating on the bottle. The coating on a silk cloth visualizes the temperature distribution on a simulated tissue during surgical operation using an ultrasonic coagulation cutting device. The coating can be applied to thermal imaging in a variety of fields. Moreover, the softening strategy contributes to explore dynamic properties of soft 2D materials.

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Layered macrocycles with flexibility and tunable dynamic properties for wide-range thermoresponsive color changes

Abstract: A new flexible layered material was generated from macrocycles containing functional, flexible, and intercalating units. The layered macrocycles exhibit thermoresponsive color changes in a wide temperature range.

Cited by 7 publications

References 66 publications

Nanoarchitectonics of Exfoliated Flexible Nanosheet Based on Laterally Stacked Macrocycles

Nanoarchitectonics of Exfoliated Flexible Nanosheet Based on Laterally Stacked Macrocycles

A highly sensitive friction-imaging device based on cascading stimuli responsiveness

Coatable 2D Conjugated Polymers Containing Bulky Macromolecular Guests for Thermal Imaging

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