Nanoindentation characterization of the micro-lamellar arrangement of black coral skeleton

Rosa, Benoit; Muñoz-Saldaña, J.; Torres-Torres, D.; Ardisson, Pedro-Luis; Alvarado‐Gil, J. J.

doi:10.1016/j.jsb.2011.12.009

Cited by 15 publications

(13 citation statements)

References 33 publications

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“…It is important to keep in mind the exceptional mechanical properties of coral trees and bushes . Coral branches (skeletons), as well as shells of numerous aqueous and terrestrial animals are formed by biomineralization of calcium ions to yield CaCO 3 .…”

Section: Introductionmentioning

confidence: 99%

Modeling red coral (Corallium rubrum) and African snail (Helixia aspersa) shell pigments: Raman spectroscopy versus DFT studies

Kupka

Buczek

Broda

et al. 2016

J Raman Spectroscopy

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Pigments from red coral (Corallium rubrum) and African snail (Helixia aspersa) shell were studied non-invasively using Raman spectroscopy with 1064-nm laser beam. The two observed bands because of organic pigments confined in biomineralized CaCO 3 matrix at about 1500 and 1100 cm À1 were assigned to ν(C¼C) and ν(C-C), respectively. Both signals originate from polyene(s) of largely unknown structure, containing several conjugated C¼C bonds. The small peak at 1016 cm À1 in the Raman spectrum of coral pigment was assigned to in-plane -CH 3 rocking or structural deformation of polyene chain because of spatial confinement in the mineral matrix. The organic pigments in red coral and snail shell were present in inorganic matrix containing aragonite (shell) and calcite (coral). In addition, using Raman spectroscopy, it was observed that aragonite was replaced by calcite as result of healing damaged parts of snail shell. This is an important finding which indicates a great potential of nondestructive Raman spectroscopy instead of X-ray technique, as a diagnostic tool in environmental studies. To support analysis of the observed Raman spectra detailed calculations using density functional theory (DFT with B3LYP and BLYP density functionals) on structure and vibrations of model all-trans polyenes were undertaken. DFT calculated C¼C and C-C stretching frequencies for all-trans polyenes containing from 2 to 14 C¼C units were compared with the observed ν(C¼C) and ν(C-C) band positions of the studied coral and shell. Individual correction factors were used to better match theoretical wavenumbers with observed band positions in red coral and African snail. It was concluded that all-trans polyene pigments of red coral and dark parts of African snail shell contain 11-12 and 14 C¼C double bond units, respectively. However, Raman spectroscopy cannot produce any clear information on the presence and nature of the end-chain substituents in the studied pigments.

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Section: Introductionmentioning

confidence: 99%

Modeling red coral (Corallium rubrum) and African snail (Helixia aspersa) shell pigments: Raman spectroscopy versus DFT studies

Kupka

Buczek

Broda

et al. 2016

J Raman Spectroscopy

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“…The order Antipatharia is characterized by a skeleton mostly made of chitin fibrils inside a lipoprotein matrix (Goldberg, 1991;Holl et al, 1992;Juárez-de la Rosa et al, 2012;Kim et al, 1992). Diphenols are also present in the skeleton in concentrations varying with the level and the age of the colony (Holl et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

“…To date, only two studies have been dedicated to the biomechanics of antipatharians (Juárez-de la Rosa et al, 2012;Kim et al, 1992). In the former study, bending tests showed significant differences in Young's modulus (i.e., the tensile stiffness) between two branched species.…”

Section: Introductionmentioning

confidence: 99%

Ecomechanics of black corals (Cnidaria: Anthozoa: Hexacorallia: Antipatharia): A comparative approach

Dugauquier

Godefroid

M’Zoudi

et al. 2021

Invertebrate Biology

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Mechanical properties of the skeleton of four antipatharians (the whip speciesCirrhipathes anguina and Stichopathes cf. maldivensis, and the branched species Cupressopathes abies and Cupressopathes cf. pumila) living in shallow waters off the southwestern coast of Madagascar were investigated using a three-point bending test. The Young's modulus did not differ according to species but was significantly higher in the distal segment of colonies, compared with the basal and median segments. By contrast, the flexural stiffness was significantly higher in whip species compared with branched ones, and in the whip species, flexural stiffness was higher in the basal segment compared with the other two segments, an observation consistent with a specific adaptation of the species to a strong current environment. Although both species cohabit identical flow conditions, whip species are able to maintain their stalk in vertical position, whereas branched species can readily bend over. This suggests that the specific flexural stiffness is linked to contrasting feeding strategies of species with different morphologies in a similar strong current environment.

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“…Therefore, the properties of individual constituents within heterogeneous materials as wood can be measured, even considering a mapping of mechanical properties across transverse sections (Ebenstein & Pruitt, 2006;Juárez-de la Rosa, Munoz-Saldana, Torres-Torres, Ardisson, & Alvarado-Gil, 2012). Also, it is well known that a greater crystallinity means a harder as well as a greater strength material, against to the totally amorphous microstructure of an average structural arrangement (El-Hadi, Schnabel, Straube, Müller, & Henning, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Nanoindentation test is an application of local surface deformation with a controlled load, where the length scale of penetration is measured in nanometers, having an improved precision than common scales in conventional hardness tests with deformations about micrometers or millimeters (Fischer‐Cripps, ). Therefore, the properties of individual constituents within heterogeneous materials as wood can be measured, even considering a mapping of mechanical properties across transverse sections (Ebenstein & Pruitt, ; Juárez‐de la Rosa, Munoz‐Saldana, Torres‐Torres, Ardisson, & Alvarado‐Gil, ).…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation based‐on atomic force microscopy and nanoindentation for spruce wood microstructure analysis

Torres-Torres

Torres²,

García‐García

2018

Microscopy Res & Technique

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Spruce wood (picea abis) has been widely used as structural element, from buildings to musical instruments, due to its outstanding mechanical performances. The main stem transverse section exhibits growth rings formed by periodic fringes patterns, which are constituted by lamellae‐tracheid arrangements. In order to improve the understanding of each wood microstructure role, the morphology and crystallinity of earlywood and latewood fibers were examined mainly using scanning electron microscopy, atomic force microscopy, and X‐ray difracction. Moreover, measurements of effective elastic modulus and hardness were obtained by nanoindentation tests using a Berkovich indenter in order to confirmed increase in compactness of the wood microstructures. The results indicate that variations in mechanical properties values can be associated with well defined microstructural performances for each characteristic fiber type, where those that belong to latewood fiber showed the most improved behaviors. A finite element simulation of a lamellar‐tracheids arrangement was carried out in order to clarify its stiffness and elastic deformation capabilities, as relevant factors contributing to the successful adaptation of picea abis colonies to harsh conditions habitats as well as for its construction applications of string instruments.

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Nanoindentation characterization of the micro-lamellar arrangement of black coral skeleton

Cited by 15 publications

References 33 publications

Modeling red coral (Corallium rubrum) and African snail (Helixia aspersa) shell pigments: Raman spectroscopy versus DFT studies

Modeling red coral (Corallium rubrum) and African snail (Helixia aspersa) shell pigments: Raman spectroscopy versus DFT studies

Ecomechanics of black corals (Cnidaria: Anthozoa: Hexacorallia: Antipatharia): A comparative approach

Finite element simulation based‐on atomic force microscopy and nanoindentation for spruce wood microstructure analysis

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