The origin of ZnO twin crystals in bio-inspired synthesis

Greer, Heather F.; Zhou, Wuzong; Liu, Ming-Han; Tseng, Yao‐Hung; Mou, Chung‐Yuan

doi:10.1039/c1ce05958k

Cited by 33 publications

(41 citation statements)

References 47 publications

(22 reference statements)

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“…The formation of such a double-layer disk via an inorganic/organic phase separation was observed in the biomimetic synthesis of CaCO 3 in the presence of gelatin [37], and in mirror symmetric growth of ZnO nanoneedles/plates [48,49]. It is also regarded as a good example of two-dimensional reversed crystal growth, a non-classical crystal growth route demonstrating a crystal growth direction from a particle surface to its core [50][51][52].…”

Section: Discussionmentioning

confidence: 99%

Formation Mechanism of CaCO3 Spherulites in the Myostracum Layer of Limpet Shells

Chiang

Zhou

2017

Crystals

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CaCO 3 spherulites were found in the myostracum layer of common limpet shells collected from East Sands, St Andrews, Scotland. Their microstructures were revealed by using powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-ray microanalysis. The formation mechanisms of these spherulites and their morphology evolution were postulated. It was proposed that spherical particles of an inorganic and biological composite formed first. In the centre of each spherical particle a double-layer disk of vaterite crystal sandwiching a biological sheet developed. The disk crystal supplies a relatively strong mirror symmetric dipole field, guiding the orientations of the nanocrystallites and the arrangement of mesorods and, therefore, determining the final morphology of the spherulite.

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Section: Discussionmentioning

confidence: 99%

Formation Mechanism of CaCO3 Spherulites in the Myostracum Layer of Limpet Shells

Chiang

Zhou

2017

Crystals

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“…Instead, they underwent aggregation to form polycrystalline particles with a rhombohedral appearance (Figure 7d). Despite the short history of this reversed crystal growth route it has been used to explain the formation of many hollow and core-shell crystals in several inorganic systems including zeolites [48,74,75], perovskites [76], metal oxides [26,77], plus more recently organic resorcinarene hexamer [78], alloy nanoparticles [79] and metal organic frameworks [80,81]. There is a need for further extensive studies on the complex interactions between organic structure directing agents and metal cations to establish the role EPS plays in biomineralisation.…”

Section: Formation Mechanismmentioning

confidence: 99%

“…For example, crystals of CaCO 3 [18][19][20][21][22][23][24], ZnO [25][26][27][28], and fluorapatite [29,30] have been grown in gel matrices or in the presence of polymers such as gelatin, chitosan, gum arabic and agarose. During the preparation process, these structure directing agents may play the role of a template and a surfactant.…”

Section: Introductionmentioning

confidence: 99%

Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

2017

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Abstract:A microstructural investigation by electron microscopy on a travertine specimen collected from Munigou National Park, Sichuan Province, China revealed evidence of a non-classical reversed crystal growth route previously only discovered in synthetic materials. Examination of the travertine specimen suggests that the presence of organic matter initiates the oriented aggregation of calcite nanocrystallites. Surface re-crystallisation of the aggregates leads to a single crystalline rhombohedral shell with a polycrystalline core. This core-shell structure carries a strong resemblance to synthetic calcite prepared in the presence of chitosan, where the growth of calcite was found to follow the so-called reversed crystal growth process. It is proposed that the similar roles of biomolecules in naturally occurring travertine and chitosan in the synthetic system are based on their isoelectric points and the polymerizable property of long chain chemical structures. This study is important so that the structural similarities between naturally occurring biominerals and biomimetic materials can be further understood.

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“…This also results in some unique morphology like twin-crystals 195) and nanoplate of ZnO,196),197) disk of ZrO 2 198),199) foam of C/Fe 3 C/MgO. 200) Nano-spheres of gelatin can also be used in a different way, as "hard" template for Ge 2 O 3 and Gd 2 O 3 /C nanospheres.…”

Section: )mentioning

confidence: 99%

Hybrid metal oxide@biopolymer materials precursors of metal oxides and metal oxide-carbon composites

Plumejeau

Alauzun

Boury

2015

J. Ceram. Soc. Japan

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Metal oxide can be prepared by mineralization process of biopolymers like cellulose, starch, alginate, chitosan, chitin, carrageenan, dextran, DNA, pectin, collagen, gelatin, silk, lignin and white-egg. The formation of corresponding hybrid composite [metal oxide@biopolymer] allows mastering the morphology, porosity, composition and structure of metal oxide and also gives access to [metal oxide@carbon] composite upon carbonization of the biopolymer We briefly review the recent advances in this fields in order to show the diversity of the approaches and their adaptations to produce material with potential applications in catalysis, energy and environment.

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The origin of ZnO twin crystals in bio-inspired synthesis

Cited by 33 publications

References 47 publications

Formation Mechanism of CaCO3 Spherulites in the Myostracum Layer of Limpet Shells

Formation Mechanism of CaCO3 Spherulites in the Myostracum Layer of Limpet Shells

Reversed Crystal Growth of Calcite in Naturally Occurring Travertine Crust

Hybrid metal oxide@biopolymer materials precursors of metal oxides and metal oxide-carbon composites

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