Atomic structure and ultrastructure of the Murex troscheli shell

Younis, Saeed; Kauffmann, Yaron; Pokroy, Boaz; Zolotoyabko, E.

doi:10.1016/j.jsb.2012.09.011

Cited by 15 publications

(23 citation statements)

References 39 publications

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“…Here we provide evidence that the heterogeneous distribution of intracrystalline organic components is likely able to promote intragranular fracture, leading to rough fractured surfaces at the nanoscale. This phenomenon is not likely limited to this system, as heterogeneous distributions of organic inclusions have been observed in several other biomineralized structures 46,47 . The nanoscale compositional heterogeneity leads to mechanical property variation at the same length scale, which further enhances energy dissipation 6 .…”

Section: Articlementioning

confidence: 67%

Hierarchical structural design for fracture resistance in the shell of the pteropod Clio pyramidata

Weaver²,

Ortiz

2015

Nat Commun

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The thecosomes are a group of planktonic pteropods with thin, 1 mm-sized aragonitic shells, which are known to possess a unique helical microstructure consisting of interlocking nanofibres. Here we investigate the detailed hierarchical structural and mechanical design of the pteropod Clio pyramidata. We quantify and elucidate the macroscopic distribution of the helical structure over the entire shell (B1 mm), the structural characteristics of the helical assembly (B10-100 mm), the anisotropic cross-sectional geometry of the fibrous building blocks (B0.5-10 mm) and the heterogeneous distribution of intracrystalline organic inclusions within individual fibres (o0.5 mm). A global fibre-like crystallographic texture is observed with local in-plane rotations. Microindentation and electron microscopy studies reveal that the helical organization of the fibrous building blocks effectively constrains mechanical damages through tortuous crack propagation. Uniaxial micropillar compression and cross-sectional transmission electron microscopy directly reveal that the interlocking fibrous building blocks further retard crack propagation at the nanometre scale.

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Section: Articlementioning

confidence: 67%

Hierarchical structural design for fracture resistance in the shell of the pteropod Clio pyramidata

Weaver²,

Ortiz

2015

Nat Commun

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“…This is very common for mollusk shells. Such a correlation between temperature dependences of normalized values of Δc/c and weight loss for Murex troscheli shell [51] is shown in Figure 9. [51] We see that at 150-200 °C, the lattice distortions are greatly reduced, and at approximately 300 °C, the unit cell dimensions of biogenic aragonite revert to those of geological aragonite.…”

Section: Physical Origin Of Anisotropic Lattice Distortionsmentioning

confidence: 71%

“…As can be seen in the histogram in Figure 7, maximal distortions (positive, i.e., elongation-like) are always along the c-axis; along the a-axis, distortions are also positive, but nearly twice as small; whereas along the b-axis, we found small and negative (i.e., shrinkage-like) distortions. [45][46][47][48][49][50][51][52] It is important to note that anisotropic lattice distortions have also been recorded in aragonitic corals Desmophyllum dianthus and Favia stelligera, [45,46] as well as in calcified byssus of mollusk shell Anomia simplex [52] For the reader's convenience, the investigated species comprising biogenic aragonite, together with the respective references, appear in Table 1. These results were confirmed and further expanded by numerous research groups.…”

Section: Aragonitementioning

confidence: 99%

“…In principle, there are two common sources for lattice parameter changes in free-standing crystalline samples: so-called "chemical strain" and non-homogeneous mechanical deformations arising at interfaces between different structural components. [51] Copyright 2012, Royal Society of Chemistry. [62] In contrast, "chemical strain" (see, e.g., [63,64] ) is a result of significant local concentrations of impurities or other defects, which cause expansion or contraction (on average) of the host lattice.…”

Section: Physical Origin Of Anisotropic Lattice Distortionsmentioning

confidence: 99%

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Anisotropic Lattice Distortions in Biogenic Minerals Originated from Strong Atomic Interactions at Organic/Inorganic Interfaces

Zolotoyabko

2016

Adv Materials Inter

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In section 3 lattice parameters a of calcite were incorrect. The corrected first paragraph is below: 3. Structure of Abiotic Calcite and Aragonite Calcite, the most stable polymorph of calcium carbonate, has a rhombohedral structure (point group 3m and space group R3 _ c, No. 167), which often is presented in a hexagonal setting with lattice parameters, a = 4.988 Å and c = 17.068 Å. [14] Note that the lattice parameters of calcite crystals are very sensitive to Mg-impurities and, therefore, in Ref. [15] most of the structural data available in the literature for Mg-containing calcite samples (geological and synthetic) have been analyzed and extrapolated to zero Mg concentration. This approach gives slightly different lattice parameters, a = 4.98964 Å and c = 17.0673 Å, which we used for further analysis of the organics-mediated lattice distortions in biogenic calcite.

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“…In the crossed-lamellar material, the amount of organic matter is relatively small; it accounts for 1.7% of the total shell weight in the related gastropod genus Murex [6]. Since aragonite is the only mineral component of the shell examined, the texture/stress analysis was performed under the assumption of an orthorhombic Crystallographic orientations along the shell thickness were determined by the quantitative three-dimensional texture analysis based on the incomplete back-reflection pole figures of (111), (012) and (002) lattice planes registered in each of the 34 analysed areas.…”

Section: Methodsmentioning

confidence: 99%

Irregularities of crystallographic orientation and residual stresses in the crossed-lamellar shell as a natural functionally graded material

Bonarski

Checa

Rodríguez‐Navarro

et al. 2015

J. R. Soc. Interface.

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The microstructures of different groups of molluscs are characterized by preferential orientations of crystallites (texture), leading to a significant anisotropy of the physical properties of the shells. A complementary characteristic, usually neglected, is the distribution of the residual stresses existing within the shell wall. By means of X-ray diffraction, we study the distribution of stresses with thickness in the shell wall of the gastropod Conus marmoreus, which has a microstructure of the crossed-lamellar type. The results revealed an extraordinary texture inhomogeneity and the existence of tensional residual stresses along the shell thickness, the origins of which are unknown. Some of the observed changes in textural parameters and stresses coincide with the transitions between shell layers, although other features are of unknown origin. Our results provide insight into the microstructural regularities that govern the mesoscale construction of shells, such as that of C. marmoreus.

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Atomic structure and ultrastructure of the Murex troscheli shell

Cited by 15 publications

References 39 publications

Hierarchical structural design for fracture resistance in the shell of the pteropod Clio pyramidata

Hierarchical structural design for fracture resistance in the shell of the pteropod Clio pyramidata

Anisotropic Lattice Distortions in Biogenic Minerals Originated from Strong Atomic Interactions at Organic/Inorganic Interfaces

Irregularities of crystallographic orientation and residual stresses in the crossed-lamellar shell as a natural functionally graded material

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