Gastropod nacre: Structure, properties and growth — Biological, chemical and physical basics

Heinemann, Fabian; Launspach, Malte; Gries, Katharina; Fritz, Monika

doi:10.1016/j.bpc.2010.11.003

Cited by 108 publications

(99 citation statements)

References 170 publications

(276 reference statements)

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“…Nacre is a robust natural composite made up of of tabular calcium carbonate crystals (95%) which are intimately associated with layers of an organic matrix (5%) that is mainly built of: (i) water-soluble aspartic acid-rich proteins, (ii) glycoproteins, (iii) insoluble highly ordered β-chitin fibers and (iv) Gly-Ala-rich protein hydrogels structurally comparable with silk-fibroin [6,[8][9][10][11][12][13][14][15][16][17]. The brick-and-mortar structure of nacre reduces crack spreading adsorbed hard phase (one out of the calcium carbonate polymorphs, in our case).…”

Section: Introductionmentioning

confidence: 99%

Calcium Carbonate Polymorphs Growing in the Presence of Sericin: A New Composite Mimicking the Hierarchic Structure of Nacre

Pastero

Aquilano

2018

Crystals

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Bioinspired self-assembled composite materials are appealing both for their industrial applications and importance in natural sciences, and represent a stimulating topic in the area of materials science, biology, and medicine. The function of the organic matrix has been studied from the biological, chemical, crystallographic, and engineering point of view. Little attention has been paid to the effect of one of the two main components of the organic matrix, the sericin fraction, on the growth morphology of calcium carbonate polymorphs. In the present work, we address this issue experimentally, emphasizing the morphological effects of sericin on calcite and aragonite crystals, and on the formation of a sericin-aragonite-calcite self-assembled composite with a hierarchic structure comparable to that of natural nacre.

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Section: Introductionmentioning

confidence: 99%

Calcium Carbonate Polymorphs Growing in the Presence of Sericin: A New Composite Mimicking the Hierarchic Structure of Nacre

Pastero

Aquilano

2018

Crystals

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“…This specialized, iridescent mineral layer commonly lines mollusk shells and sometimes the main component of other shell species [15,18]. Commonly, nacre structure resembles a "brick and mortar" assembly with CaCO 3 "platelets" with an organic matrix dispersed in between [11,12,15,[17][18][19][20]. This combination of organic (<5%) and inorganic components produces an extremely strong protective layer with high tensile strength and superior fracture toughness [12,15].…”

Section: Biological Capping Layersmentioning

confidence: 99%

“…The inside layer of mollusk shells is termed nacre or "mother of pearl" [15,18]. This specialized, iridescent mineral layer commonly lines mollusk shells and sometimes the main component of other shell species [15,18]. Commonly, nacre structure resembles a "brick and mortar" assembly with CaCO 3 "platelets" with an organic matrix dispersed in between [11,12,15,[17][18][19][20].…”

Section: Biological Capping Layersmentioning

confidence: 99%

“…Mollusca are an example of a large phylum of invertebrate species found in marine and fresh water environments with hard outer shell [11,12,[14][15][16]. The shells of mollusks are made of mostly CaCO 3 and protect the animals from predators, help resist high pressures in the deep ocean, guard against wave damage in intertidal areas, and resist corrosion from sea water [12,[15][16][17].…”

Section: Biological Capping Layersmentioning

confidence: 99%

“…The shells of mollusks are made of mostly CaCO 3 and protect the animals from predators, help resist high pressures in the deep ocean, guard against wave damage in intertidal areas, and resist corrosion from sea water [12,[15][16][17]. The inside layer of mollusk shells is termed nacre or "mother of pearl" [15,18].…”

Section: Biological Capping Layersmentioning

confidence: 99%

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Engineering Glass Passivation Layers -Model Results

Skorski¹,

Ryan²,

Strachan³

et al. 2011

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SUMMARYThe immobilization of radioactive waste into glass waste forms is a baseline process of nuclear waste management not only in the United States, but worldwide. The rate of radionuclide release from these glasses is a critical measure of the quality of the waste form. Over long-term tests and using extrapolations of ancient analogues, it has been shown that well designed glasses exhibit a dissolution rate that quickly decreases to a slow residual rate for the lifetime of the glass. The mechanistic cause of this decreased corrosion rate is a subject of debate, with one of the major theories suggesting that the decrease is caused by the formation of corrosion products in such a manner as to present a diffusion barrier on the surface of the glass. Although there is much evidence of this type of mechanism, there has been no attempt to engineer the effect to maximize the passivating qualities of the corrosion products.This study represents the first attempt to engineer the creation of passivating phases on the surface of glasses. Our approach utilizes interactions between the dissolving glass and elements from the disposal environment to create impermeable capping layers. By drawing from other corrosion studies in areas where passivation layers have been successfully engineered to protect the bulk material, we present here a report on mineral phases that are likely have a morphological tendency to encrust the surface of the glass. Our modeling has focused on using the AFCI glass system in a carbonate, sulfate, and phosphate rich environment. We evaluate the minerals predicted to form to determine the likelihood of the formation of a protective layer on the surface of the glass. We have also modeled individual ions in solutions vs. pH and the addition of aluminum and silicon. These results allow us to understand the pH and ion concentration dependence of mineral formation. We have determined that iron minerals are likely to form a complete incrustation layer and we plan to look more closely at Vivianite [Fe 3 (PO 4 ) 2 •8(H 2 O)] and Siderite [FeCO 3 ] in the next stage of the project.

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On the Damage Tolerance of Bioinspired Gradient Composites with Nacre‐Like Architecture

Zhang,

Liu,

et al. 2024

Adv Funct Materials

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The evolution of natural armor materials has led to gradient structures with specific architectures to achieve high damage tolerance, thus offering valuable inspiration for the design of man‐made materials. Here, bioinspired gradient composites with a nacre‐like brick‐and‐mortar architecture are fabricated by infiltrating a polymer phase into porous ceramic scaffolds with position‐specific ceramic content. These composites demonstrate an integrated structure with notable several‐fold variations in local hardness and modulus across the thickness. The asymmetric mechanical properties and toughening mechanisms of the composites are investigated and compared to those of uniform composites. Specifically, when loaded along the direction of decreasing stiffness – resembling the typical loading configuration of natural armors, the gradient composites exhibit superior damage tolerance compared to the opposite direction and a uniform composite with equivalent ceramic content. This is attributed to the decreased peak stress, broader stress distribution, and increased deformation capacity, along with enhanced toughening effects that impede crack growth through mechanisms of crack deflection, crack bridging by uncracked ligaments, together with their frictional pull‐out from crack surfaces. This study deepens the understanding of the damage tolerance of gradient materials and offers insights for the bioinspired design of highly damage‐tolerant materials.

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Gastropod nacre: Structure, properties and growth — Biological, chemical and physical basics

Cited by 108 publications

References 170 publications

Calcium Carbonate Polymorphs Growing in the Presence of Sericin: A New Composite Mimicking the Hierarchic Structure of Nacre

Calcium Carbonate Polymorphs Growing in the Presence of Sericin: A New Composite Mimicking the Hierarchic Structure of Nacre

Engineering Glass Passivation Layers -Model Results

On the Damage Tolerance of Bioinspired Gradient Composites with Nacre‐Like Architecture

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