Residual Strain and Stress in Biocrystals

Seknazi, Eva; Pokroy, Boaz

doi:10.1002/adma.201707263

Cited by 42 publications

(48 citation statements)

References 74 publications

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“…Likewise, the lenses of the brittle star possess optimized optical properties despite being composed of calcite, a birefringent material 5 . Considerable research has focused on these biominerals from the perspective of materials science, in an attempt to understand the specific compositions and structures responsible for their superior properties 7–9 , and to learn strategies that can be applied in the design of novel synthetic materials 10–15 .…”

Section: Introductionmentioning

confidence: 99%

From spinodal decomposition to alternating layered structure within single crystals of biogenic magnesium calcite

et al. 2019

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As organisms can form crystals only under ambient conditions, they demonstrate fascinating strategies to overcome this limitation. Recently, we reported a previously unknown biostrategy for toughening brittle calcite crystals, using coherently incorporated Mg-rich nanoprecipitates arranged in a layered manner in the lenses of a brittle star, Ophiocoma wendtii. Here we propose the mechanisms of formation of this functional hierarchical structure under conditions of ambient temperature and limited solid diffusion. We propose that formation proceeds via a spinodal decomposition of a liquid or gel-like magnesium amorphous calcium carbonate (Mg-ACC) precursor into Mg-rich nanoparticles and a Mg-depleted amorphous matrix. In a second step, crystallization of the decomposed amorphous precursor leads to the formation of high-Mg particle-rich layers. The model is supported by our experimental results in synthetic systems. These insights have significant implications for fundamental understanding of the role of Mg-ACC material transformation during crystallization and its subsequent stability.

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Section: Introductionmentioning

confidence: 99%

From spinodal decomposition to alternating layered structure within single crystals of biogenic magnesium calcite

et al. 2019

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“…Many biominerals demonstrate excellent properties associated with highly controlled and elaborated compositions and structures . Most marine biominerals consist of calcite, which incorporates intracrystalline organic and inorganic inclusions that are believed to be important for their superior properties . Inspired by the strategies of biominerals, and in attempts to gain insights into their mechanisms, numerous studies have addressed the effects and the limits of organic or inorganic intracrystalline inclusions in synthetic calcite .…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Insights into the Bioinspired Formation of Disordered Ba‐Calcite

Seknazi

Levy

Polishchuk

et al. 2018

Adv Funct Materials

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Calcite has the ability to host large amounts of intracrystalline inclusions, a phenomenon that is known to be the case in biominerals and has been demonstrated in bioinspired synthetic systems. In this study, barium ion is focused on as the inclusion. Highly substituted Ba-calcite possesses disordered carbonate orientations, characteristic of 3 3 R R m m symmetry. It is shown that calcite experiences an order-disorder transition, in which the carbonate groups undergo progressive loss of their rotational order with increasing amounts of incorporated Ba, and reach complete rotational disorder for a critical amount of Ba. This transition is characterized and a theoretical model justifying the influence of Ba is proposed. Moreover, the disordered 3 3 R R m m Ba-substituted calcite has been previously identified as a high-temperature phase or as a highly metastable room-temperature phase. Those descriptions are challenged by successfully synthesizing it under slow-rate conditions and by studying its thermal behavior, and it is concluded that the fully disordered Ba-calcite is stable, whereas the transitional, partially disordered Ba-calcite phase is metastable.

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“…A median filter was applied to exclude outlier data points. Residual stress occurs naturally due to the structural mismatch of aragonite platelets and organic matrices 63 . To subtract the natural residual stress, the v 0 value was calibrated for each indent using the median peak position of the nacre in native condition.…”

Section: Methodsmentioning

confidence: 99%

Nacre toughening due to cooperative plastic deformation of stacks of co-oriented aragonite platelets

et al. 2020

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Nacre’s structure-property relationships have been a source of inspiration for designing advanced functional materials with both high strength and toughness. These outstanding mechanical properties have been mostly attributed to the interplay between aragonite platelets and organic matrices in the typical brick-and-mortar structure. Here, we show that crystallographically co-oriented stacks of aragonite platelets, in both columnar and sheet nacre, define another hierarchical level that contributes to the toughening of nacre. By correlating piezo-Raman and micro-indentation results, we quantify the residual strain energy associated with strain hardening capacity. Our findings suggest that the aragonite stacks, with characteristic dimensions of around 20 µm, effectively store energy through cooperative plastic deformation. The existence of a larger length scale beyond the brick-and-mortar structure offers an opportunity for a more efficient implementation of biomimetic design.

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Residual Strain and Stress in Biocrystals

Cited by 42 publications

References 74 publications

From spinodal decomposition to alternating layered structure within single crystals of biogenic magnesium calcite

From spinodal decomposition to alternating layered structure within single crystals of biogenic magnesium calcite

Experimental and Theoretical Insights into the Bioinspired Formation of Disordered Ba‐Calcite

Nacre toughening due to cooperative plastic deformation of stacks of co-oriented aragonite platelets

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