Biocatalytic Synthesis of a Nanostructured and Crystalline Bimetallic Perovskite‐Like Barium Oxofluorotitanate at Low Temperature.

Brutchey, Richard L.; Yoo, Edward S.; Morse, Daniel E.

doi:10.1002/chin.200645216

Cited by 6 publications

(7 citation statements)

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“…Previous studies have shown that biomineral-associated proteins can template or catalyze the biomineralization. 24,25 Structural changes of mineral proteins were observed during the biomineralization process. 19,26,27 In the present study, we explored the CaCO 3 biomineralization as well as changes of secondary structure of ChiSifiCa with the time course evolution by means of FTIR (Figure 6a).…”

Section: Roles Of Chisifica In Cacomentioning

confidence: 99%

Organized Arrangement of Calcium Carbonate Crystals, Directed by a Rationally Designed Protein

Ping

Wan

Xie

et al. 2018

Crystal Growth & Design

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The integration of a "brick and mortar" structure and superior fracture toughness of nacre has attracted intensive attention recently. Elucidating the interactions between biomacromolecules and inorganic phases is beneficial to understand the structure-forming process of nacre. Herein, a recombinant protein, ChiSifiCa, mimicking features of the organic matrix in nacre is rationally designed. This protein contains three functional domains, chitin binding (Chi), silk fibroin (Sifi), and calcium ion binding (Ca). The domain order in ChiSifiCa is in the same manner as the distribution of organic matrix in nacre. When ChiSifiCa binds to the surface of chitin, it provides a confined microenvironment facilitating CaCO 3 mineralization. The formation of spherical vaterite minerals with a hollow structure was observed under the function of ChiSifiCa. These minerals are assembled by wellaligned nanoplatelets and nanoparticles, distributed in the outer and inner region of the sphere, respectively. The nanoparticles were oriented radially from the center to the edge. These nanoplatelets with stacked multilayers display almost the same crystallographic orientation. During the biomineralization process, there is change of secondary structure of ChiSifiCa from random coil to α-helix.

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Section: Roles Of Chisifica In Cacomentioning

confidence: 99%

Organized Arrangement of Calcium Carbonate Crystals, Directed by a Rationally Designed Protein

Ping

Wan

Xie

et al. 2018

Crystal Growth & Design

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“…In general, ABO 3 perovskite-types of the ferroelectric group are common but it is difficult to tailor nanostructures because they readily form highly symmetric cubic structures ( Fig. 1) during synthesis [11][12][13][14][15]. Among the various methodologies and applications, direct water splitting using a single spinel type perovskite photocatalyst is attractive due to its simplicity, and is likely to be the most cost-effective approach to achieve large-scale solar hydrogen production [5,7,16,17], but it is also regarded as the most challenging because there are more strict requisites compared to other nanostructured systems.…”

Section: Introductionmentioning

confidence: 99%

Structurally tuned lead magnesium titanate perovskite as a photoelectrode material for enhanced photoelectrochemical water splitting

Chandrasekaran

Kim

Chung

et al. 2017

Chemical Engineering Journal

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First time, four distinct types of Lead Magnesium Titanate (PMT) perovskites including spheres, flakes, hierarchical flower and thin microbelts shaped were finely tuned via facile solution method to develop cost effective and high performance photoanode material for water splitting. The influence of solvent effects during structural tuning, purity, morphology, optical obsorption, structural phase transition and stoichiometric formation of prepared Lead Magnesium Titanate perovskites has been discussed in detail. Remarkably, thin microbelts structured PMT perovskite (PMTT) exhibited an excellent water splitting performance and it is more sensitive to the illuminated visible light. Owing to the unique structural features, the photoconversion efficiency value of PMTT perovskite is ~3.9, 3.54, 2.85 and 1.52 times higher than those of other prepared PMT perovskites including pristine PbTiO 3. The excellent water splitting performance of PMTT (thin microbelts) may be ascribed to the remarkable structural features that include a large surface area, high optical absorbance, more active sites and high interface area of the microbelts, which provide large contact areas between the electrolyte and highly active materials for electrolyte diffusion and a rapid route for charge transfer with minimal diffusion resistance. In addition, each thin microbelt is directly in contact with the Ni foam substrate, which can also shorten the diffusion path for the electrons. The demonstrated approach paves the way to significantly low-cost and high-throughput production of next generation, high performance and highly active water splitting perovskite photocatalyst.

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“…The amino acid sequences of the most abundant silicateins isolated from Tethya aurantia (α-and β-forms) are very similar (50% by sequence, up to 75% by function) to the well-studied cathepsin-L family of hydrolytic enzymes, suggesting a mechanistic pathway to silica from the tetraethylorthosilicate precursor via hydrolysis of ligands surrounding the precursor. 24 For a full discussion of the use of silicatein in inorganic material synthesis we refer the reader to the excellent review by Andre et al 25 Native or recombinant forms of silicatein have previously been successfully applied to biomineralization of silicon dioxide, 24 titanium dioxide, 26 gallium(III) oxide, 27 tin dioxide, 28 and barium titanate oxyfluoride 29 particles. This body of work is complemented by that of the Tremel group, who have sought to utilize surface-immobilized silicatein to mineralize thin films of multiple materials onto inorganic support materials.…”

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confidence: 99%

“…33 In contrast, BaTiOF 4 was successfully biomineralized in crystalline form, although unfortunately without any corresponding functional property measurements, most likely due to the relatively low material yield of many biomineralization strategies; the authors in that work note that insufficient material was obtained for X-ray diffraction (XRD) analysis. 29 While the pursuit of functional materials is ongoing, there are, to the best of our knowledge, no prior reports of the functional properties of directly biomineralized catalytic oxides, although there are some reports regarding the function of other directly biomineralized materials, for example, the use of directly biomineralized metal chalcogenide quantum dots in photovoltaic applications, 34 the magnetic properties of fungi-mediated biomineralized magnetite, 35 the ferroelectric properties of fungi-mediated barium titanate, 36 and reports of fungi-mediated manganese-containing materials, 37 or bacterial-mediated γ-FeOOH to form α-Fe 2 O 3 base Li-ion battery electrodes upon a brief heat treatment. 38…”

mentioning

confidence: 99%

Direct Single-Enzyme Biomineralization of Catalytically Active Ceria and Ceria–Zirconia Nanocrystals

Curran¹,

Jia³

et al. 2017

ACS Nano

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Biomineralization is an intriguing approach to the synthesis of functional inorganic materials for energy applications whereby biological systems are engineered to mineralize inorganic materials and control their structure over multiple length scales under mild reaction conditions. Herein we demonstrate a single-enzyme-mediated biomineralization route to synthesize crystalline, catalytically active, quantum-confined ceria (CeO) and ceria-zirconia (CeZrO) nanocrystals for application as environmental catalysts. In contrast to typical anthropogenic synthesis routes, the crystalline oxide nanoparticles are formed at room temperature from an otherwise inert aqueous solution without the addition of a precipitant or additional reactant. An engineered form of silicatein, rCeSi, as a single enzyme not only catalyzes the direct biomineralization of the nanocrystalline oxides but also serves as a templating agent to control their morphological structure. The biomineralized nanocrystals of less than 3 nm in diameter are catalytically active toward carbon monoxide oxidation following an oxidative annealing step to remove carbonaceous residue. The introduction of zirconia into the nanocrystals leads to an increase in Ce(III) concentration, associated catalytic activity, and the thermal stability of the nanocrystals.

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Biocatalytic Synthesis of a Nanostructured and Crystalline Bimetallic Perovskite‐Like Barium Oxofluorotitanate at Low Temperature.

Cited by 6 publications

References 1 publication

Organized Arrangement of Calcium Carbonate Crystals, Directed by a Rationally Designed Protein

Organized Arrangement of Calcium Carbonate Crystals, Directed by a Rationally Designed Protein

Structurally tuned lead magnesium titanate perovskite as a photoelectrode material for enhanced photoelectrochemical water splitting

Direct Single-Enzyme Biomineralization of Catalytically Active Ceria and Ceria–Zirconia Nanocrystals

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