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Spirulina-templated metal microcoils with controlled helical structures for THz electromagnetic responses.

Kamata K, Piao Z, Suzuki S, Fujimori T, Tajiri W, Nagai K, Iyoda T, Yamada A, Hayakawa T, Ishiwara M, Horaguchi S, Belay A, Tanaka T, Takano K, Hangyo M - Sci Rep (2014)

Bottom Line: Spirulina varies its diameter, helical pitch, and/or length against growing environment.Here, we describe the biotemplating process onto Spirulina surface to fabricate metal microcoils.A microcoil dispersion sheet exhibited optically active response attributed to structural resonance in terahertz-wave region.

View Article: PubMed Central - PubMed

Affiliation: 1] Iyoda Supra-Integrated Material Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), 4259 Nagatsuta-Cho, Midori-Ku, Yokohama, Kanagawa 226-8503, Japan [2] Research Society for Biotemplate Technology, 4259 Nagatsuta-Cho, Midori-Ku, Yokohama, Kanagawa 226-8503, Japan.

ABSTRACT
Microstructures in nature are ultrafine and ordered in biological roles, which have attracted material scientists. Spirulina forms three-dimensional helical microstructure, one of remarkable features in nature beyond our current processing technology such as lithography in terms of mass-productivity and structural multiplicity. Spirulina varies its diameter, helical pitch, and/or length against growing environment. This unique helix is suggestive of a tiny electromagnetic coil, if composed of electro-conductive metal, which brought us main concept of this work. Here, we describe the biotemplating process onto Spirulina surface to fabricate metal microcoils. Structural parameters of the microcoil can be controlled by the cultivation conditions of Spirulina template and also purely one-handed microcoil can be fabricated. A microcoil dispersion sheet exhibited optically active response attributed to structural resonance in terahertz-wave region.

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Right-handed (RH) Spirulina and their biotemplated products.RH template-1 to -3 with three different Lfree/Ns, (a) – (c), generated the corresponding RH μcoils: (coil number, Lfree/N); (d) RH μcoil-1, 19 μm; (e) RH μcoil-2, 14 μm; (f) RH μcoil-3, 6 μm.
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f3: Right-handed (RH) Spirulina and their biotemplated products.RH template-1 to -3 with three different Lfree/Ns, (a) – (c), generated the corresponding RH μcoils: (coil number, Lfree/N); (d) RH μcoil-1, 19 μm; (e) RH μcoil-2, 14 μm; (f) RH μcoil-3, 6 μm.

Mentions: Right-handed (RH) strains of Spirulina are rare but they are found both in nature and in culture. Reversal of helical handedness from left to right and vice versa has been observed and ascribed to genetic drift or environmental factors like temperature uplift or mechanical stress15. One such RH strain obtained from Earthrise Nutritionals, California, USA, was grown in pure culture from a single trichome. The RH Spirulina was more tightly coiled smaller than around 20 μm in Lfree/N. The RH templates and the corresponding μcoils were prepared in the same manner as the LH series (Fig. 3 and Fig. S17). The structural parameters for all of μcoils and referenced samples are summarized in Table 1.


Spirulina-templated metal microcoils with controlled helical structures for THz electromagnetic responses.

Kamata K, Piao Z, Suzuki S, Fujimori T, Tajiri W, Nagai K, Iyoda T, Yamada A, Hayakawa T, Ishiwara M, Horaguchi S, Belay A, Tanaka T, Takano K, Hangyo M - Sci Rep (2014)

Right-handed (RH) Spirulina and their biotemplated products.RH template-1 to -3 with three different Lfree/Ns, (a) – (c), generated the corresponding RH μcoils: (coil number, Lfree/N); (d) RH μcoil-1, 19 μm; (e) RH μcoil-2, 14 μm; (f) RH μcoil-3, 6 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4017220&req=5

f3: Right-handed (RH) Spirulina and their biotemplated products.RH template-1 to -3 with three different Lfree/Ns, (a) – (c), generated the corresponding RH μcoils: (coil number, Lfree/N); (d) RH μcoil-1, 19 μm; (e) RH μcoil-2, 14 μm; (f) RH μcoil-3, 6 μm.
Mentions: Right-handed (RH) strains of Spirulina are rare but they are found both in nature and in culture. Reversal of helical handedness from left to right and vice versa has been observed and ascribed to genetic drift or environmental factors like temperature uplift or mechanical stress15. One such RH strain obtained from Earthrise Nutritionals, California, USA, was grown in pure culture from a single trichome. The RH Spirulina was more tightly coiled smaller than around 20 μm in Lfree/N. The RH templates and the corresponding μcoils were prepared in the same manner as the LH series (Fig. 3 and Fig. S17). The structural parameters for all of μcoils and referenced samples are summarized in Table 1.

Bottom Line: Spirulina varies its diameter, helical pitch, and/or length against growing environment.Here, we describe the biotemplating process onto Spirulina surface to fabricate metal microcoils.A microcoil dispersion sheet exhibited optically active response attributed to structural resonance in terahertz-wave region.

View Article: PubMed Central - PubMed

Affiliation: 1] Iyoda Supra-Integrated Material Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), 4259 Nagatsuta-Cho, Midori-Ku, Yokohama, Kanagawa 226-8503, Japan [2] Research Society for Biotemplate Technology, 4259 Nagatsuta-Cho, Midori-Ku, Yokohama, Kanagawa 226-8503, Japan.

ABSTRACT
Microstructures in nature are ultrafine and ordered in biological roles, which have attracted material scientists. Spirulina forms three-dimensional helical microstructure, one of remarkable features in nature beyond our current processing technology such as lithography in terms of mass-productivity and structural multiplicity. Spirulina varies its diameter, helical pitch, and/or length against growing environment. This unique helix is suggestive of a tiny electromagnetic coil, if composed of electro-conductive metal, which brought us main concept of this work. Here, we describe the biotemplating process onto Spirulina surface to fabricate metal microcoils. Structural parameters of the microcoil can be controlled by the cultivation conditions of Spirulina template and also purely one-handed microcoil can be fabricated. A microcoil dispersion sheet exhibited optically active response attributed to structural resonance in terahertz-wave region.

Show MeSH
Related in: MedlinePlus