Photo-triggered surface relief formation of polystyrene films based on the Marangoni flow driven by a surface photoresponsive skin layer

Kitamura, Issei; Hara, Mitsuo; Nagano, Shusaku; Seki, Takahiro

doi:10.1080/15421406.2021.1946966

Cited by 4 publications

(2 citation statements)

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“…Recently, microstructures fabricated by using the mass transport method have become popular, especially Marangoni flow. [102][103][104][105][106] Marangoni flow is a kind of interfacial agitation driven by local variations of interfacial tension, 107,108 which can be used in the photoresponsive AZ-containing system. Our group has developed a two-step method to fabricate microstructures on the film surface of PM6AZC4 (half-life: 14.6h, Fig.…”

Section: Fabrication Of Gratings and Micro-patternsmentioning

confidence: 99%

Manipulation of photoresponsive liquid-crystalline polymers and their applications: from nanoscale to macroscale

Ji,

2024

J. Mater. Chem. C

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Section: Fabrication Of Gratings and Micro-patternsmentioning

confidence: 99%

Manipulation of photoresponsive liquid-crystalline polymers and their applications: from nanoscale to macroscale

Ji,

2024

J. Mater. Chem. C

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“…Production of bulk birefringence and engraving of SRGs in azo-polymer systems afford their use in holographic devices [ 14 ], liquid crystal displays [ 15 ], optical switching [ 16 ], light couplers for waveguides [ 17 ], optical storage [ 18 ], and shape memory devices [ 19 ]. Based on the above described molecular phenomena, the researchers were focused on the development of SRGs on several kinds of polymer structures containing azo-chromophores, such as modified chitosan [ 20 ], polymer salt [ 21 ], polymethyl methacrylate [ 22 ], polystyrene [ 23 ], poly(vinyl alcohol) with azobenzene side chains [ 24 ], and polyimides (PIs) [ 25 ]. The latter category of polymers introduces the advantage of high thermal and radiation stability, while they exhibit attractive mechanical and electrical performances [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Azo-Chromophore Sort on the Features of the Supramolecular Azopolyimide Films Desired to Be Used as Substrates for Flexible Electronics

Stoica¹,

Epure

Barzic³

et al. 2022

IJMS

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High-performance supramolecular polyimide systems were synthesized via a simple and innovative approach using two types of azo-chromophores, leading to concomitant special properties: high thermostability, the ability to be processed in the form of films with high flexibility, adequate morphological features, and good structuring capacity via phase mask ultraviolet (UV) laser irradiation, induced by the presence of the azo groups (–N=N–). The dimension and the anisotropy degree of the micro/nano patterns obtained on the surface of the flexible films (determined by atomic force microscopy) depend on the azo-dye type used in the supramolecular azopolyimide synthesis, which were higher when the azo-chromophore containing a –cyano group (−C≡N) was used. The molecular dynamics method, an excellent tool for an in-depth examination of the intermolecular interactions, was used to explain the morphological aspects. Energetic, dynamic and structural parameters were calculated for the two systems containing azo-chromophores, as well as for the pristine polymer system. It was highlighted that the van der Waals forces make a major contribution to the intermolecular interactions. The results from the combination of the dynamic analysis and the concentration profile explain the better mobility of the polyimide chains with a maximum content of azo groups in the cis configuration compared to the other systems. Taking all these data into account, the surfaces of the films can be tuned as required for the proposed applications, namely as substrates for flexible electronis.

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Reversible Perspiring Artificial “Fingertips”

et al. 2023

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Fingertip perspiration is a vital process within human predation, to which the species owes its survival and its biological success. In this paper, the unique human ability of extensive perspiration and controlled friction in self‐assembled cholesteric liquid crystals is recreated, mimicking the natural processes that occur in the dermis and epidermis of human skin. This is achieved by inducing porosity in responsive, liquid‐bearing material through the controlled‐polymerization phase‐separation process. The unique topography of human fingerprints is further emulated in the materials by balancing the parallel chirality‐induced force and the perpendicular substrate‐anchoring force during synthesis. As a result, artificial fingertips are capable of secreting and re‐absorbing liquid upon light illumination. By demonstrating the function of the soft material in a tribological aspect, it exhibits a controllable anti‐sliding property comparable to human fingertips and subsequently attains a higher degree of biomimicry. This biomimetic fingertip is envisioned being applied in a multitude of fields, ranging from biomedical instruments to interactive, human‐like soft robotic devices.

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Photo-triggered surface relief formation of polystyrene films based on the Marangoni flow driven by a surface photoresponsive skin layer

Cited by 4 publications

References 62 publications

Manipulation of photoresponsive liquid-crystalline polymers and their applications: from nanoscale to macroscale

Manipulation of photoresponsive liquid-crystalline polymers and their applications: from nanoscale to macroscale

The Impact of the Azo-Chromophore Sort on the Features of the Supramolecular Azopolyimide Films Desired to Be Used as Substrates for Flexible Electronics

Reversible Perspiring Artificial “Fingertips”

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