Expansion of Bragg Reflection Width and Tuning Wavelength in Elastomer-Immobilized Non-Close-Packed Colloidal Crystal Films.
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| Title: | Expansion of Bragg Reflection Width and Tuning Wavelength in Elastomer-Immobilized Non-Close-Packed Colloidal Crystal Films. |
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| Authors: | Makino, Miyu1 (AUTHOR), Kanai, Toshimitsu1 (AUTHOR) tkanai@ynu.ac.jp |
| Source: | Polymers (20734360). Apr2026, Vol. 18 Issue 8, p946. 11p. |
| Subjects: | Colloidal crystals, Photopolymerization, Photonic crystals, Structural colors, Polymer films, Compression loads |
| Abstract: | Colloidal crystals are periodic arrays of monodisperse particles that exhibit optical stopbands, which can be experimentally observed as a Bragg reflection characterized by a specific Bragg wavelength and width. Precise control of these characteristic parameters is essential for applications in structural color materials, sensors, and tunable photonic crystals. Although the Bragg reflection wavelength can be widely tuned by adjusting the lattice spacing via changes in particle size and concentration, controlling the width over a wide range—such as through expansion—is challenging because it is intrinsically determined by the refractive index contrast between the colloidal particles and their surrounding medium. In this study, the Bragg reflection width of non-close-packed colloidal crystals immobilized in an elastomer film was successfully expanded by adjusting the photoinitiator concentration and ultraviolet light intensity for photopolymerization. Expansion was attributed to the superposition of Bragg reflections at different wavelengths, resulting from spatial variations in the lattice spacings of the non-close-packed colloidal crystals formed during photopolymerization. Owing to the solvent-free and highly flexible nature of the elastomer-immobilized, non-close-packed colloidal crystal film, the Bragg reflection wavelength was readily tuned by mechanical compression while maintaining the expanded Bragg reflection width, thereby advancing the practical applications of structural color materials. [ABSTRACT FROM AUTHOR] |
| Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 193439522 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Expansion of Bragg Reflection Width and Tuning Wavelength in Elastomer-Immobilized Non-Close-Packed Colloidal Crystal Films. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Makino%2C+Miyu%22">Makino, Miyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kanai%2C+Toshimitsu%22">Kanai, Toshimitsu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> tkanai@ynu.ac.jp</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Apr2026, Vol. 18 Issue 8, p946. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Colloidal+crystals%22">Colloidal crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Photopolymerization%22">Photopolymerization</searchLink><br /><searchLink fieldCode="DE" term="%22Photonic+crystals%22">Photonic crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+colors%22">Structural colors</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+films%22">Polymer films</searchLink><br /><searchLink fieldCode="DE" term="%22Compression+loads%22">Compression loads</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Colloidal crystals are periodic arrays of monodisperse particles that exhibit optical stopbands, which can be experimentally observed as a Bragg reflection characterized by a specific Bragg wavelength and width. Precise control of these characteristic parameters is essential for applications in structural color materials, sensors, and tunable photonic crystals. Although the Bragg reflection wavelength can be widely tuned by adjusting the lattice spacing via changes in particle size and concentration, controlling the width over a wide range—such as through expansion—is challenging because it is intrinsically determined by the refractive index contrast between the colloidal particles and their surrounding medium. In this study, the Bragg reflection width of non-close-packed colloidal crystals immobilized in an elastomer film was successfully expanded by adjusting the photoinitiator concentration and ultraviolet light intensity for photopolymerization. Expansion was attributed to the superposition of Bragg reflections at different wavelengths, resulting from spatial variations in the lattice spacings of the non-close-packed colloidal crystals formed during photopolymerization. Owing to the solvent-free and highly flexible nature of the elastomer-immobilized, non-close-packed colloidal crystal film, the Bragg reflection wavelength was readily tuned by mechanical compression while maintaining the expanded Bragg reflection width, thereby advancing the practical applications of structural color materials. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/polym18080946 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 946 Subjects: – SubjectFull: Colloidal crystals Type: general – SubjectFull: Photopolymerization Type: general – SubjectFull: Photonic crystals Type: general – SubjectFull: Structural colors Type: general – SubjectFull: Polymer films Type: general – SubjectFull: Compression loads Type: general Titles: – TitleFull: Expansion of Bragg Reflection Width and Tuning Wavelength in Elastomer-Immobilized Non-Close-Packed Colloidal Crystal Films. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Makino, Miyu – PersonEntity: Name: NameFull: Kanai, Toshimitsu IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 04 Text: Apr2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 20734360 Numbering: – Type: volume Value: 18 – Type: issue Value: 8 Titles: – TitleFull: Polymers (20734360) Type: main |
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