Microstructure and mechanical property of Ruditapes philippinarum shell

Mu, Gang; Duan, Fuhai; Zhang, Guochen; Li, Xiuchen; Ding, Xiaofei; Zhang, Lei

doi:10.1016/j.jmbbm.2018.06.012

Cited by 15 publications

(10 citation statements)

References 38 publications

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“…The changes in the hardness and modulus on different sections are consistent with those in cross-lamellar structures reported in the other mollusk animals S. purpuratus , and Ruditapes philippinarum …”

Section: Discussionsupporting

confidence: 87%

“…The changes in the hardness and modulus on different sections are consistent with those in cross-lamellar structures reported in the other mollusk animals S. purpuratus 40,43 and Ruditapes philippinarum. 60 Both the elastic modulus and hardness values of the transverse and longitudinal cross sections of the rib part gradually increase from the outer layer to the inner layers. Besides the microstructural differences, another reason is that the organic component content in the outer layer of the rib part (2.20%) is slightly higher than that in other parts (1.94%), and the presence of organic component can play a certain buffer role when subjected to an external force.…”

Section: Discussionmentioning

confidence: 99%

“…The measured hardness values from the nanoindentation are slightly higher than the values obtained via microhardness, which is reasonable and consistent with that reported in the literature. , It may be related to the difference in the loads and the shape of the indenters for the microhardness and nanoindentation tests. Low loads and small indenters are used for nanoindentation tests, and thus the hardness values via nanoindentation are more sensitive to penetration depth than those obtained via microhardness. ,, …”

Section: Discussionmentioning

confidence: 99%

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Investigation on the Microstructures and Mechanical Properties of the Shells of Tridacna crocea

Song

et al. 2022

Crystal Growth & Design

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Researchers have discovered that the aragonite nanofibers are packed as highly ordered cross-lamellar structures in the shells of Giant clam Tridacna gigas and have excellent mechanical properties. However, differences in the microstructures and mechanical properties between different locations of the shells of Giant clams have not been reported. The microstructures of the shells and the relationship of the micro- and nanostructures and the mechanical properties of the different parts of the shells (main part and rib part) of another kind of Giant clam Tridacna crocea have not been reported yet. In this work, the multilevel ordered micro- and nanostructures in the main part and rib part of the shells of T. crocea were investigated in detail. It shows that both the main part and the rib part are composed of cross-lamellar structures, and the third-order structure (building units) are aragonite nanoribbons, which are densely packed as a self-locking mosaic. This is the first time to report that the building units for the aragonite cross-lamellar structures are nanoribbons instead of nanofibers, while the nanoribbons have particular structural features such as self-locking mosaic packing and dense packing phenomenon on the fractured section. Furthermore, we find that the angles between the long axes of the nanoribbons of the two sets of lamellar structures of the main part and the outer layer of the rib part vary from 120 to 100°, a novel structural feature for cross-lamellar structures. In addition, the mechanical properties such as flexural strength, compressive strength, hardness, and elastic modulus for the different cross sections of different parts of T. crocea were found to be different, and their relationship with the microstructures was studied and discussed. The flexural strength values of the horizontal planes of the main part and the outer layer rib part of the shells of T. crocea are 114.3 ± 2.49 and 118.0 ± 3.74 MPa, respectively, much higher than that of the longitudinal cross sections (79.0 ± 4.55 and 58.7 ± 1.25 MPa, respectively). The compressive strength tests show that the transverse cross sections of the main part and outer layer of the rib part have the highest compressive strength values (221.7 ± 4.82 and 153.3 ± 5.91 MPa, respectively), medium values for the longitudinal cross section (189.0 ± 7.87 and 126.3 ± 9.50 MPa, respectively), and the lowest values for the horizontal plane. The average hardness and elastic modulus values of the transverse and longitudinal cross sections of the rib part gradually increase from the outer to the inner layers. In this work, we show that the mechanical properties are strongly related to the different multilevel ordered assembly modes of micro- and nanostructures.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Investigation on the Microstructures and Mechanical Properties of the Shells of Tridacna crocea

Song

et al. 2022

Crystal Growth & Design

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“…Nanoindentation results in the context of previous studies Young's modulus, hardness, and micro-cracking stress of Porites skeletons varied significantly across environments, as well as within a single location and a single colony. In comparison with other aragonitic biominerals, such as nacre (E ¼ 60-84 GPa, H ¼ 2:7-6.5 GPa), conch (E ¼ 74 GPa, H ¼ 3:3 GPa), or pteropods (E ¼ 51:1-85.9 GPa, H ¼ 5:2-5.6 GPa) (Amini and Miserez 2013;Zhang et al 2011;Mu et al 2018), Porites skeletons possessed inferior mechanical properties (E ¼ 62:4 GPa, H ¼ 2:0 GPa). Despite variability within colonies, which was likely driven by seasonal changes in growth and calcification, we observed both site-specific differences and common patterns across sites.…”

Section: Discussionmentioning

confidence: 99%

Environmental impact on the mechanical properties of Porites spp. corals

et al. 2021

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Despite the economic and ecological importance of corals’ skeletal structure, as well as their predicted vulnerability to future climate change, few studies have examined the skeletal mechanical properties at the nanoscale. As climate change is predicted to alter coral growth and physiology, as well as increase mechanical stress events (e.g., bioerosion, storm frequency), it is crucial to understand how skeletal mechanical properties change with environmental conditions. Moreover, while material properties are intimately linked to the chemical composition of the skeleton, no previous study has examined mechanical properties alongside carbonate geochemical composition. Using Porites coral cores from a wide range of reef environments (Thailand, Singapore, Taiwan), we correlated coral’s micro-mechanical properties with chemical composition. In contrast to previous mechanical measurements of reef-building corals, we document unprecedented variability in the hardness, stiffness, and micro-cracking stress of Porites corals across reef environments, which may significantly decrease the structural integrity of reef substrate. Corals from environments with low salinity and high sedimentation had higher organic content and fractured at lower loads, suggesting that skeletal organic content caused enhanced embrittlement. Within individual coral cores, we observed seasonal variability in skeletal stiffness, and a relationship between high sea surface temperature, increased stiffness, and high-density. Regionally, lower Sr/Ca and higher Mg/Ca coincided with decreased stiffness and hardness, which is likely driven by increased amorphous calcium carbonate and skeletal organic content. If the coral is significantly embrittled, as measured here in samples from Singapore, faster erosion is expected. A decrease in skeletal stiffness will decrease the quality of reef substrate, enhance the rate of bioerosion by predators and borers, and increase colony dislodgement, resulting in widespread loss of structural complexity.

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“…In fact, the oxygen consumption of intertidal species exhibits circatidal rhythms, which may be Although the shell acts as a boundary between the bivalve and the environment, valve closure does not protect the soft tissues of the bivalves from thermal stress caused by elevated temperatures. This is due to the high thermal diffusion of aragonite shells (Gómez-Martinez et al, 2002;Woodin et al, 2020), the main form of calcium carbonate (CaCO 3 ) of Ruditapes species (Mu et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

The Impact of Climate Change on Bivalve Farming: Combined Effect of Temperature and Salinity on Survival and Feeding Behavior of Clams Ruditapes decussatus

et al. 2022

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European clam (Ruditapes decussatus) is one of the most relevant emergent bivalve species from the aquaculture sector in Europe with high economic value. Climate changes represent a potential limiting factor to this activity, directly interfering with the survival and behavior of bivalves. Severe fluctuations in temperature along with periods of heavy rainfall or periods of drought that significantly change the salinity can promote physiological stress in bivalves, resulting in changes in physiological and behavioral responses and, in extreme cases, leading to high mortalities. This study aimed to evaluate the combined effect of temperature and salinity on mortality and feeding behavior of R. decussatus. Juveniles and adults were exposed to combined ranges of temperature (5°C–35°C) and salinity (0–40). Mortality and feeding behavior were registered every 24 h of each 120-h trial. A control temperature range was set between 15°C and 23°C, where mortality and feeding behavior were considered as the normal scenario. Our data suggested salinity 15 as a “turning point,” a point from which occurred distinct patterns in mortality and feeding behavior. The results evidently indicate that abrupt reductions in salinity and sharp increases in temperature will lead to high mortality of R. decussatus. Juveniles were revealed to be more sensitive to the increase of temperature in a less saline environment, to suffer greater and faster mortalities, and to be more resistant to extremely high temperatures under more saline conditions. The high temperatures and sporadic heavy rainfall that are predicted to occur in the south of Europe due to climate changes will contribute to compromise the recruitment of European clam, thus threatening the production of this species and consequently impacting the economic sector.

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Microstructure and mechanical property of Ruditapes philippinarum shell

Cited by 15 publications

References 38 publications

Investigation on the Microstructures and Mechanical Properties of the Shells of Tridacna crocea

Investigation on the Microstructures and Mechanical Properties of the Shells of Tridacna crocea

Environmental impact on the mechanical properties of Porites spp. corals

The Impact of Climate Change on Bivalve Farming: Combined Effect of Temperature and Salinity on Survival and Feeding Behavior of Clams Ruditapes decussatus

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