Anatase assemblies from algae: coupling biological self-assembly of 3-D nanoparticle structures with synthetic reaction chemistry

Unocic, Raymond R.; Zalar, Frank M.; Sarosi, Peter; Cai, Yuanqiang; Sandhage, Kenneth H.

doi:10.1039/b400599f

Cited by 78 publications

(82 citation statements)

References 12 publications

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“…Note, the twofold decrease in their overall size is in good agreement with the dimensional changes expected based on their initial silica content after mineralization. As recently demonstrated for natural diatom frustules, we anticipate that these silicified structures can be readily converted to other materials, such as MgO [68] or titania [69] through a halide gas/solid displacement reaction. More generally, our ink design can be extended to incorporate natural or synthetic polypeptides that allow a broader range of biomineralization strategies to be pursued, which when coupled with our ability to pattern 3D structures of arbitrary shape and periodicity, may open up new avenues for soft-to-hard matter conversion under ambient conditions.…”

Section: D Polyelectrolyte Scaffolds: Templates For Biomimetic Minermentioning

confidence: 95%

Direct Ink Writing of 3D Functional Materials

2006

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Section: D Polyelectrolyte Scaffolds: Templates For Biomimetic Minermentioning

confidence: 95%

Direct Ink Writing of 3D Functional Materials

2006

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“…For example, metal oxides were produced through methods involving gas/solid displacement reactions, [145,146,275] wet chemical processes, [279,147] or ALD. [143] Sandhage et al developed shape-preserving, gas/silica displacement reactions to convert diatom frustules into various metal oxides.…”

Section: Diatom-templated Gas Sensorsmentioning

confidence: 99%

Biotemplated Materials for Sustainable Energy and Environment: Current Status and Challenges

2011

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Materials science will play a key role in the further development of emerging solutions for the increasing problems of energy and environment. Materials found in nature have many inspiring structures, such as hierarchical organizations, periodic architectures, or nanostructures, that endow them with amazing functions, such as energy harvesting and conversion, antireflection, structural coloration, superhydrophobicity, and biological self-assembly. Biotemplating is an effective strategy to obtain morphology-controllable materials with structural specificity, complexity, and related unique functions. Herein, we highlight the synthesis and application of biotemplated materials for six key areas of energy and environment technologies, namely, photocatalytic hydrogen evolution, CO(2) reduction, solar cells, lithium-ion batteries, photocatalytic degradation, and gas/vapor sensing. Although the applications differ from each other, a common fundamental challenge is to realize optimum structures for improved performances. We highlight the role of four typical structures derived from biological systems exploited to optimize properties: hierarchical (porous) structures, periodic (porous) structures, hollow structures, and nanostructures. We also provide examples of using biogenic elements (e.g., C, Si, N, I, P, S) for the creation of active materials. Finally, we disscuss the challenges of achieving the desired performance for large-scale commercial applications and provide some useful prototypes from nature for the biomimetic design of new materials or systems. The emphasis is mainly focused on the structural effects and compositional utilization of biotemplated materials.

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“…Similarly, other diatom replicas have been produced by Sandhage et al via oxidation-reduction gas/solid displacement reactions to form various structural replicas composed of magnesium oxide, zirconium dioxide, titanium dioxide and silicon [45][46][47][48][49]. Furthermore, there are reports of successful generation of a negative replica of the diatom using an imprinting method with polydimethylsiloxane, which can act as a template to produce positive structural replicas in a wide range of materials [50,51].…”

Section: Diatomsmentioning

confidence: 99%