On mechanisms of mesocrystal formation: magnesium ions and water environments regulate the crystallization of amorphous minerals

CrystEngComm ◽  
2018 ◽  
Vol 20 (31) ◽  
pp. 4395-4405 ◽  
Author(s):  
Yu-Chieh Huang ◽  
Maxim Benjamin Gindele ◽  
Jennifer Knaus ◽  
Ashit Rao ◽  
Denis Gebauer
Keyword(s):  
Magnesium Ions ◽  
Nano Structures ◽  
Amorphous Minerals

Elucidating the emergence of crystalline superstructures from amorphous precursors, hydration environments and ionic constituents can guide transformation and structuration reactions towards distinct micro- and nano-structures.

Observations of the Thermal Decomposition of Brucite

1968 ◽  
Vol 26 ◽  
pp. 446-447
Author(s):  
P. L. Burnett ◽  
W. R. Mitchell ◽  
C. L. Houck
Keyword(s):  
Thermal Decomposition ◽  
Magnesium Oxide ◽  
Basal Plane ◽  
Magnesium Ions ◽  
A Value ◽  
Reaction Proceeds

Natural Brucite (Mg(OH)2) decomposes on heating to form magnesium oxide (MgO) having its cubic ﹛110﹜ and ﹛111﹜ planes respectively parallel to the prism and basal planes of the hexagonal brucite lattice. Although the crystal-lographic relation between the parent brucite crystal and the resulting mag-nesium oxide crystallites is well known, the exact mechanism by which the reaction proceeds is still a matter of controversy. Goodman described the decomposition as an initial shrinkage in the brucite basal plane allowing magnesium ions to shift their original sites to the required magnesium oxide positions followed by a collapse of the planes along the original <0001> direction of the brucite crystal. He noted that the (110) diffraction spots of brucite immediately shifted to the positions required for the (220) reflections of magnesium oxide. Gordon observed separate diffraction spots for the (110) brucite and (220) magnesium oxide planes. The positions of the (110) and (100) brucite never changed but only diminished in intensity while the (220) planes of magnesium shifted from a value larger than the listed ASTM d spacing to the predicted value as the decomposition progressed.

The Effect of Agents which Modify Platelet Behaviour and of Magnesium Ions on Thrombus Formation In Vivo

1979 ◽  
Vol 42 (02) ◽  
pp. 603-610 ◽  
Author(s):  
J H Adams ◽  
J R A Mitchell
Keyword(s):  
Thrombus Formation ◽  
Cerebral Arteries ◽  
Magnesium Ions ◽  
Body Formation ◽  
Inflammatory Agent ◽  
Platelet Thrombus ◽  
Magnesium Salts ◽  
Higher Doses ◽  
Do So

SummaryThe ability of potential anti-thrombotic agents to modify platelet-thrombus formation in injured cerebral arteries in the rabbit was tested. Low doses of heparin were without effect, while higher doses produced variable suppression of white body formation but at the expense of bleeding. Aspirin did not inhibit white body formation but another non-steroid anti-inflammatory agent, flurbiprofen was able to do so, as was the anti-gout agent, sulphinpyrazone. Magnesium salts both topically and parenterally, suppressed thrombus formation and increased the concentration of ADP which was required to initiate thrombus production at minor injury sites.

Laser based fabrication of micro and nano-structures using sacrificial layers

2004 ◽  
Author(s):  
Andrew. J. Lee ◽  
Michael. J. Withford ◽  
Judith. M. Dawes
Keyword(s):  
Nano Structures ◽  
Sacrificial Layers

Effect of substitution on the mechanism of conductivity of ultra dispersed lithium - iron spinel, substituted with magnesium ions

2017 ◽  
Vol 9 (5) ◽  
pp. 05018-1-05018-6
Author(s):  
B. K. Ostafiychuk ◽  
◽  
L. S. Kaykan ◽  
J. S. Mazurenko ◽  
B. Ya. Deputat ◽  
...  
Keyword(s):  
Magnesium Ions

Abiotic reduction of 2,4-dinitrotoluene in the presence of sulfide minerals under anoxic conditions

1996 ◽  
Vol 34 (10) ◽  
pp. 25-33 ◽  
Author(s):  
Cheng Jiayang ◽  
Makram T. Suidan ◽  
Albert D. Venosa
Keyword(s):  
Electron Donor ◽  
Chemical Reduction ◽  
Sulfide Minerals ◽  
Sulfide Concentration ◽  
Magnesium Ions ◽  
High Concentration ◽  
Anoxic Conditions ◽  
High Affinity ◽  
Iron Nickel ◽  
Abiotic Reduction

Abiotic reduction of 2,4-dinitrotoluene (DNT) in the presence of sulfide minerals has been investigated under anoxic conditions at 35°C. 2,4-DNT was abiotically reduced to 4-amino-2-nitrotoluene (4-A-2-NT) and 2-amino-4-nitrotoluene (2-A-4-NT) in the presence of high concentration of sulfide (0.84 mM). No abiotic reduction of 2,4-DNT was observed in the presence of low sulfide concentration (0.42 mM). The rate and the extent of the abiotic reduction of 2,4-DNT were increased with an increase in sulfide concentration. Sulfide served as an electron donor for the reduction of 2,4-DNT. The 2-nitro group was preferentially reduced, making the 2-A-4-NT:4-A-2-NT ratio in the final products 2:1. The addition of iron, nickel, and cobalt minerals significantly enhanced the abiotic reduction. The FeS, NiS, and CoS solids formed in the serum bottles catalyzed the reduction of 2,4-DNT preferentially to 4-A-2-NT. MnS and CuS solids also catalyzed the reduction of 2,4-DNT to 4-A-2-NT, but did not change the overall reduction of 2,4-DNT. However, the presence of calcium, zinc, and magnesium minerals impeded 2,4-DNT reduction. The calcium, zinc, and magnesium ions have a high affinity to sulfide, inactivating sulfide as an electron donor for the chemical reduction of 2,4-DNT.

scholarly journals Tridimensional multiphysics model for the study of photo-induced thermal effects in arbitrary nano-structures

2011 ◽  
Vol 6 ◽  
Author(s):  
Guillaume Demésy ◽  
Laurent Gallais ◽  
Mireille Commandrée
Keyword(s):  
Thermal Effects ◽  
Nano Structures

scholarly journals Effects of Adenosine Triphosphate and Magnesium Ions on the Fumarase Reaction

1969 ◽  
Vol 244 (4) ◽  
pp. 1070-1075
Author(s):  
P E Penner ◽  
L H Cohen
Keyword(s):  
Adenosine Triphosphate ◽  
Magnesium Ions

scholarly journals In Situ Observation of Electron-Beam-Induced Formation of Nano-Structures in PbTe

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 163
Author(s):  
Iryna Zelenina ◽  
Igor Veremchuk ◽  
Yuri Grin ◽  
Paul Simon
Keyword(s):  
Electron Beam ◽  
Gas Phase ◽  
Threshold Current ◽  
Threshold Current Density ◽  
Atomic Scale ◽  
In Situ Observation ◽  
Nano Structures ◽  
Transmission Electron ◽  
Initial Crystal

Nano-scaled thermoelectric materials attract significant interest due to their improved physical properties as compared to bulk materials. Well-shaped nanoparticles such as nano-bars and nano-cubes were observed in the known thermoelectric material PbTe. Their extended two-dimensional nano-layer arrangements form directly in situ through electron-beam treatment in the transmission electron microscope. The experiments show the atomistic depletion mechanism of the initial crystal and the recrystallization of PbTe nanoparticles out of the microparticles due to the local atomic-scale transport via the gas phase beyond a threshold current density of the beam.

Nano‐Structures as Bioelectronics for Controlled Drug Delivery

2021 ◽  
pp. 285-308 ◽  
Author(s):  
Debabrata Ghosh Dastidar ◽  
Dipanjan Ghosh ◽  
Gopal Chakrabarti
Keyword(s):  
Drug Delivery ◽  
Controlled Drug Delivery ◽  
Nano Structures

Fabrication of zinc oxide nano-structures in RF inductively-coupled thermal plasma and their photoluminescence effects

2021 ◽  
Vol 25 ◽  
pp. 18-23
Author(s):  
Hee Il Yoo ◽  
Rodolphe Mauchauffé ◽  
Se Youn Moon
Keyword(s):  
Zinc Oxide ◽  
Thermal Plasma ◽  
Inductively Coupled ◽  
Nano Structures ◽  
Inductively Coupled Thermal Plasma
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