Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin

Hashimoto, Hideki; Asaoka, Hiroshi; Nakano, Takuya; Kusano, Yoshihiro; Ishihara, Hisashi; Ikeda, Yasunori; Nakanishi, Makoto; Fujii, Toru; Yokoyama, Tadanori; Horiishi, Nanao; Nanba, Tokuro; Takada, Jun

doi:10.1016/j.dyepig.2012.06.024

Cited by 42 publications

(38 citation statements)

References 42 publications

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“…As mentioned already, the sheath material of Leptothrix has a variety of attractive functions for industrial purposes [18][19][20][21][22]39,40]. We expect that the biologically created Si-rich sheaths will have additional functions that will be useful as an industrial material.…”

Section: Ed/xrd-results and Crystallinity Of Sheathsmentioning

confidence: 99%

“…To verify this assumption, we prepared modified media that contained various concentrations of sodium silicate in a study focused on the structural and compositional differences between strain OUMS1 grown in an SIGP and the modified Si-rich media. This study aimed to create new functional materials by culturing OUMS1, because natural Leptothrix sheaths have been noted to have a variety of industrial applications such as a lithium ion battery electrode material [18], a catalyst enhancer [19][20][21], and a pottery pigment [22]. Controlling the composition of the sheaths would further increase the usefulness of the material.…”

Section: Introductionmentioning

confidence: 99%

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Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

et al. 2014

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This study aimed to manipulate the texture and elemental composition of the novel sheaths produced by the iron-oxidizing bacterium Leptothrix in culture by altering components of the medium. When previously isolated strain OUMS1 was cultured in media (pH 7.0 throughout incubation) containing various levels of Si on a rotary shaker at 20 °C and 70 rpm for 14 days, the strain was able to reproduce in media with up to 300 ppm Si, and the hollow microtubular architecture of the sheath was maintained even at 300 ppm Si. The constitutional iron oxide phase changed from poorly crystalline lepidocrocite at 0 ppm Si to X-ray diffraction (XRD)-amorphous 2-line ferrihydrite at 100-300 ppm via their mixture phase with intermediate Si content . The results strongly indicate that the chemical character and crystallinity of the sheath texture can be regulated by culture conditions, especially components of the medium.

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Section: Ed/xrd-results and Crystallinity Of Sheathsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

et al. 2014

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“…To date, a variety of industrial functions such as lithium-ion battery anode material [24,25], catalyst enhancer [26][27][28], and porcelain pigment [29] have been discovered for the sheaths of Leptothrix. Our previous study further indicated that the chemical character and crystallinity of the sheath matrix can be modified depending on the culture conditions for the strains, especially on the components of the medium [30].…”

Section: Introductionmentioning

confidence: 99%

Direct Adherence of Fe(III) Particles onto Sheaths of Leptothrix sp. Strain OUMS1 in Culture

et al. 2016

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“…Our previous microscopic and spectroscopic studies proved that the sheath was an ingenious hybrid of organic and inorganic materials produced through the interaction of bacterial exopolymers with aqueous-phase inorganics [5,8,9]. Intriguingly, natural Leptothrix sheaths were discovered to have a variety of the industrial functions: lithium-ion battery anode material [10], catalyst enhancer [11][12][13], and porcelain pigment [14]. The quality and quantity of the natural sheaths, however, are inevitably influenced by environmental changes such as temperature, quantity of supplied groundwater or spring water, concentrations of inorganics in water, as was noted by Vollrath et al [15].…”

Section: Introductionmentioning

confidence: 99%

Use of Iron Powder to Obtain High Yields of Leptothrix Sheaths in Culture

et al. 2015

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Abstract:The Leptothrix species, Fe-oxidizing bacteria, produce an extracellular, microtubular sheath with a complicated organic-inorganic hybrid nature. We have discovered diverse industrial functions for this material, e.g., electrode material for Li-ion batteries, catalyst enhancers, pigments, plant growth promoters, and plant protectants. To consistently obtain material with the qualitative and quantitative stability needed for industrial applications, we focused on developing an optimum culture system for sheath synthesis by the Leptothrix sp. strain OUMS1. Although we have used Fe plates as an Fe source in the liquid silicon-glucose-peptone medium (SGP), the plates do not yield a consistent quality or precise mass, and formation of Fe-encrusted sheath is restricted to a surface of the plates, which limits harvest yield. In this study, to obtain a high yield of sheaths, we cultured OUMS1 in SGP supplemented with Fe powders. The addition of Fe powders to the medium (up to 14.0 g/L) did not adversely influence growth of OUMS1. The final yield of sheaths was about 10-fold greater than in the Fe plate culture. The sheaths also maintained a microtubular form and crystalline texture similar to those produced on Fe plates

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Preparation, microstructure, and color tone of microtubule material composed of hematite/amorphous-silicate nanocomposite from iron oxide of bacterial origin

Cited by 42 publications

References 42 publications

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

Direct Adherence of Fe(III) Particles onto Sheaths of Leptothrix sp. Strain OUMS1 in Culture

Use of Iron Powder to Obtain High Yields of Leptothrix Sheaths in Culture

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