Secondary lanthanide phosphate mineralization in weathering profiles of I-, S-, and A-type granites

2020 ◽  
pp. 1-30
Author(s):  
Marcos Y. Voutsinos ◽  
Jillian F. Banfield ◽  
John W. Moreau
Keyword(s):  
Lanthanide Phosphate ◽  
Phosphate Mineralization

scholarly journals Effect of Different Mineralization Modes on Strengthening Calcareous Sand under Simulated Seawater Conditions

2021 ◽  
Vol 13 (15) ◽  
pp. 8265
Author(s):  
Shiyu Liu ◽  
Bowen Dong ◽  
Jin Yu ◽  
Yanyan Cai ◽  
Xingqian Peng ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Construction Projects ◽  
Construction Material ◽  
X Ray Diffraction ◽  
Calcareous Sand ◽  
Sand Column ◽  
Sporosarcina Pasteurii ◽  
Phosphate Mineralization ◽  
Filling Water ◽  
Simulated Seawater

Calcareous sand, as a blow-fill or construction material, is widely used in island and reef construction projects in marine environments after treatment. When microorganism-induced mineralization is used to strengthen calcareous sand, salinity and other conditions in the marine environment will adversely affect microorganisms or their mineralization process. For this reason, the two environmental conditions created by deionized water and simulated seawater were introduced to explore their effects on the growth and urease activity of Sporosarcina pasteurii. Then, the changes in the permeability and mechanical strength of calcareous sand under different mineralization methods were compared by one-dimensional sand column tests. Finally, the reinforcement mechanism was compared and analyzed based on the results of scanning electron microscopy and X-ray diffraction tests. The results show that Sporosarcina pasteurii can induce carbonate and phosphate precipitation and mineralization to strengthen calcareous sand in simulated seawater. The mineralized products greatly reduce the permeability of calcareous sand and significantly improve the mechanical strength by wrapping calcareous sand particles, filling water seepage channels and cementing adjacent particles. The reinforcement effect of carbonate mineralization is better than that of phosphate mineralization, but phosphate mineralization has less impact on the environment during the treatment process.

Hybrid Microgels with Confined Needle-like Lanthanide Phosphate Nanocrystals

2016 ◽  
Vol 28 (2) ◽  
pp. 501-510 ◽  
Author(s):  
Sepehr Mastour Tehrani ◽  
Wanjuan Lin ◽  
Sabine Rosenfeldt ◽  
Gerald Guerin ◽  
Yijie Lu ◽  
...  
Keyword(s):  
Lanthanide Phosphate ◽  
Hybrid Microgels

scholarly journals Recombinant DNA technology and click chemistry: a powerful combination for generating a hybrid elastin-like-statherin hydrogel to control calcium phosphate mineralization

2017 ◽  
Vol 8 ◽  
pp. 772-783 ◽  
Author(s):  
Mohamed Hamed Misbah ◽  
Mercedes Santos ◽  
Luis Quintanilla ◽  
Christina Günter ◽  
Matilde Alonso ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Click Chemistry ◽  
Recombinant Dna ◽  
Fibrillar Structure ◽  
Cross Link ◽  
Recombinant Dna Technology ◽  
Peptide Epitope ◽  
Phosphate Mineralization ◽  
Potential Applications ◽  
Dna Technology

Understanding the mechanisms responsible for generating different phases and morphologies of calcium phosphate by elastin-like recombinamers is supreme for bioengineering of advanced multifunctional materials. The generation of such multifunctional hybrid materials depends on the properties of their counterparts and the way in which they are assembled. The success of this assembly depends on the different approaches used, such as recombinant DNA technology and click chemistry. In the present work, an elastin-like recombinamer bearing lysine amino acids distributed along the recombinamer chain has been cross-linked via Huisgen [2 + 3] cycloaddition. The recombinamer contains the SNA15 peptide domains inspired by salivary statherin, a peptide epitope known to specifically bind to and nucleate calcium phosphate. The benefit of using click chemistry is that the hybrid elastin-like-statherin recombinamers cross-link without losing their fibrillar structure. Mineralization of the resulting hybrid elastin-like-statherin recombinamer hydrogels with calcium phosphate is described. Thus, two different hydroxyapatite morphologies (cauliflower- and plate-like) have been formed. Overall, this study shows that crosslinking elastin-like recombinamers leads to interesting matrix materials for the generation of calcium phosphate composites with potential applications as biomaterials.

scholarly journals Understanding the early stages of calcium phosphate mineralization through hyperpolarized NMR techniques.

2021 ◽  
Author(s):  
Tristan Georges ◽  
Ludovica Epasto ◽  
Albina Selimović ◽  
Dennis Kurzbach ◽  
Thierry Azaïs
Keyword(s):  
Calcium Phosphate ◽  
Early Stages ◽  
Phosphate Mineralization ◽  
Nmr Techniques

Mineralogy, paragenesis, and mineral chemistry of REEs in the Olserum-Djupedal REE-phosphate mineralization, SE Sweden

2018 ◽  
Vol 103 (1) ◽  
pp. 125-142 ◽  
Author(s):  
Stefan S. Andersson ◽  
Thomas Wagner ◽  
Erik Jonsson ◽  
Radoslaw M. Michallik
Keyword(s):  
Mineral Chemistry ◽  
Phosphate Mineralization
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