The presence of nanogranular microstructures is a widely reported feature of biominerals that form by classical and non-classical mineralization pathways. Inspired by nature, we have synthesized amorphous calcium carbonate nanoparticles with nanogranular microstructures, whose grain size is tuned by varying the polymer concentration. The response to indentation of single calcium carbonate nanoparticles proceeds via an intermittent stick-slip that reflects the characteristics of the nanogranular microstructure. A two-fold mechanism is thus proposed to enhance the toughness of the nanoparticles, namely nanogranular rearrangement and intergranular bridging by an organic phase and/or hydration. This work not only provides a synthesis route to design biologically inspired mineral nanoparticles with nanogranular structure, but also helps in understanding toughening mechanisms of biominerals arising from their nanoscale heterogeneity.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c7nr05347a | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Microscopic insights into the effects of interfacial dynamics and nanoconfinement on characteristics of calcium carbonate clusters within two-dimensional nanochannels.
Phys Chem Chem Phys
January 2025
College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China.
Herein, the interfacial effects on calcium carbonate clustering within two-dimensional (2D) graphene nanochannels were systematically investigated using molecular dynamics simulations. The distribution characteristics of the ions at the interface can be attributed to the ordered water layers within the 2D nanochannels. The orientation of CO is approximately perpendicular to the interface, which can be attributed to hydrogen bonding and its association with Ca at the interface region.
View Article and Find Full Text PDFGenomic and biochemical investigations in the biomineralizing potential of an isolated marine ureolytic Bacillus sp. N₉.
Sci Total Environ
January 2025
School of Chemical and Biotechnology, SASTRA Deemed University, Thirumalaisamudram, Thanjavur 613 401, Tamil Nadu, India. Electronic address:
Microbially Induced Calcium Carbonate Precipitation (MICP) plays a significant role in coastal soil stabilization and erosion prevention. In the present study, the biomineralizing potential of a newly isolated Bacillus sp. N₉ was investigated through MICP.
View Article and Find Full Text PDFCombining Hard Shell with Soft Core to Enhance Enzyme Activity and Resist External Disturbances.
Adv Sci (Weinh)
January 2025
Department of Cardiology, The First People's Hospital of Wenling, Wenling Hospital of Wenzhou Medical University, Wenling, Zhejiang, 317500, China.
Immobilizing enzymes onto solid supports having enhanced catalytic activity and resistance to harsh external conditions is considered as a promising and critical method of broadening enzymatic applications in biosensing, biocatalysis, and biomedical devices; however, it is considerably hampered by limited strategies. Here, a core-shell strategy involving a soft-core hexahistidine metal assembly (HmA) is innovatively developed and characterized with encapsulated enzymes (catalase (CAT), horseradish peroxidase, glucose oxidase (GOx), and cascade enzymes (CAT+GOx)) and hard porous shells (zeolitic imidazolate framework (ZIF), ZIF-8, ZIF-67, ZIF-90, calcium carbonate, and hydroxyapatite). The enzyme-friendly environment provided by the embedded HmA proves beneficial for enhanced catalytic activity, which is particularly effective in preserving fragile enzymes that will have been deactivated without the HmA core during the mineralization of porous shells.
View Article and Find Full Text PDFCase report: Prolonged and severe hungry bone syndrome after parathyroidectomy in X-linked hypophosphatemia.
Front Endocrinol (Lausanne)
January 2025
Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy.
Tertiary hyperparathyroidism is characterized by hypercalcemia resulting from autonomous parathyroid hormone production and usually occurs after a prolonged period of secondary hyperparathyroidism. This condition can be a complication of X-linked hypophosphatemia (XLH), a rare genetic disease characterized by renal phosphate loss and consequent hypophosphatemia. Parathyroidectomy is considered the first-line therapy but surgical intervention can be complicated by hungry bone syndrome.
View Article and Find Full Text PDFEditorial: Green and sustainable chemistry editor's pick 2024.
Front Chem
January 2025
Green Chemistry Centre of Excellence, University of York, York, United Kingdom.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!