Proposed high-pressure calorimetric experiment to probe theoretical predictions on the liquid-liquid critical point hypothesis

2007 ◽  
Vol 76 (2) ◽  
Author(s):  
Manuel I. Marqués
Keyword(s):  
High Pressure ◽  
Critical Point ◽  
Calorimetric Experiment ◽  
Theoretical Predictions ◽  
Critical Point Hypothesis

Electronic properties ofCeIn3under high pressure near the quantum critical point

2001 ◽  
Vol 65 (2) ◽  
Author(s):  
G. Knebel ◽  
D. Braithwaite ◽  
P. C. Canfield ◽  
G. Lapertot ◽  
J. Flouquet
Keyword(s):  
High Pressure ◽  
Critical Point ◽  
Electronic Properties ◽  
Quantum Critical Point ◽  
Quantum Critical

Titania aerogels with tailored nano and microstructure: comparison of lyophilization and supercritical drying

2017 ◽  
Vol 89 (4) ◽  
pp. 501-509 ◽  
Author(s):  
Jan Šubrt ◽  
Eva Pližingrová ◽  
Monika Palkovská ◽  
Jaroslav Boháček ◽  
Mariana Klementová ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
High Pressure ◽  
Phase Composition ◽  
Critical Point ◽  
Amorphous Material ◽  
Supercritical Drying ◽  
Porous Composite ◽  
Titanyl Sulfate ◽  
Critical Point Drying ◽  
Highly Porous

AbstractStructure and phase composition of titania aerogels can be substantially influenced simply by the process of drying their parent water colloid suspensions prepared by the reaction of hydrogen peroxide with suspension of precipitates obtained by neutralization of solution of titanyl sulfate with ammonia. Two methods of drying are compared: (1) lyophilization of fast frozen material immersed in liquid nitrogen, and (2) critical point drying using supercritical CO2 under high pressure. Both methods of drying lead to yellow titanium peroxide aerogels consisting of nanometer-sized blocks. While lyophilization leads to foils consisting of nano-sized crystalline nuclei of peroxo-polytitanic acid dispersed in predominantly amorphous material, the critical point drying provides rather bulk highly porous composite consisting of randomly oriented flat nanoparticles (5–10 nm) composed of crystalline anatase and amorphous peroxo-polytitanic acid.

A Study on Thermal Behavior of Large Seal-Ring

1982 ◽  
Vol 104 (4) ◽  
pp. 449-453 ◽  
Author(s):  
T. Suganami ◽  
T. Masuda ◽  
N. Oishi ◽  
T. Shimazu
Keyword(s):  
High Pressure ◽  
Film Thickness ◽  
Hot Spots ◽  
Design Parameters ◽  
Seal Ring ◽  
Shaft Seal ◽  
Oil Film ◽  
Theoretical Predictions ◽  
Oval Deformation ◽  
Oval Shape

The behavior of seal-ring in the shaft seal which operates on oil film to seal high pressure gas is studied. The experiment on the 60 cm diameter seal-ring shows the slow whirl phenomenon, i.e., the local oil film thickness and that temperature varies with the period of about 100 seconds. The analytical model is formulated and predicts the oval deformation of seal-ring due to hot spots, and that the oval shape rotates slowly but periodically according to the shift of hot spots. Theoretical predictions are confirmed to agree well with the experiment. Also, the effects of some design parameters are described to prevent the relevant slow whirl.

Theoretical predictions of the structural and thermodynamic properties of MgZn2 Laves phase under high pressure

2013 ◽  
Vol 115 (1) ◽  
pp. 323-331 ◽  
Author(s):  
Yong Liu ◽  
Wen-Cheng Hu ◽  
De-Jiang Li ◽  
Xiao-Qin Zeng ◽  
Chun-Shui Xu
Keyword(s):  
High Pressure ◽  
Thermodynamic Properties ◽  
Laves Phase ◽  
Theoretical Predictions

The Liquid—Liquid Critical-Point Hypothesis

1997 ◽  
pp. 246-263 ◽  
Author(s):  
H. E. Stanley ◽  
S. T. Harrington ◽  
F. Sciortino ◽  
P. H. Poole ◽  
S. Sastry
Keyword(s):  
Critical Point ◽  
Critical Point Hypothesis

scholarly journals Pressure-induced phase transitions in Na2B12H12, structural investigation on a candidate for solid-state electrolyte

2019 ◽  
Vol 75 (3) ◽  
pp. 406-413 ◽  
Author(s):  
Romain Moury ◽  
Zbigniew Łodziana ◽  
Arndt Remhof ◽  
Léo Duchêne ◽  
Elsa Roedern ◽  
...  
Keyword(s):  
High Pressure ◽  
Solid State ◽  
Bulk Modulus ◽  
Density Functional ◽  
Ambient Pressure ◽  
Density Functional Theory Calculations ◽  
Ionic Conductors ◽  
Theoretical Predictions ◽  
Primary Order ◽  
The Stability

closo-Borates, such as Na2B12H12, are an emerging class of ionic conductors that show promising chemical, electrochemical and mechanical properties as electrolytes in all-solid-state batteries. Motivated by theoretical predictions, high-pressure in situ powder X-ray diffraction on Na2B12H12 was performed and two high-pressure phases are discovered. The first phase transition occurs at 0.5 GPa and it is persistent to ambient pressure, whereas the second transition takes place between 5.7 and 8.1 GPa and it is fully reversible. The mechanisms of the transitions by means of group theoretical analysis are unveiled. The primary-order parameters are identified and the stability at ambient pressure of the first polymorph is explained by density functional theory calculations. Finally, the parameters relevant to engineer and build an all-solid-state battery, namely, the bulk modulus and the coefficient of the thermal expansion are reported. The relatively low value of the bulk modulus for the first polymorph (14 GPa) indicates a soft material which allows accommodation of the volume change of the cathode during cycling.

Lead Staining by Ion Implantation

1976 ◽  
Vol 34 ◽  
pp. 320-321
Author(s):  
B. C. Dobbs
Keyword(s):  
High Pressure ◽  
Electron Microscope ◽  
Ion Implantation ◽  
Critical Point ◽  
Radiation Damage ◽  
Lead Ions ◽  
Microscope Examination ◽  
Electron Microscope Examination

Ion implantation has been effectively used as a stain for biological specimens prepared for electron microscope examination (1,2). We have used this method of staining on critical point dried T4 bacteriophage. The lead ions proved to be a non-specific stain. However, these ions are also highly susceptible to radiation damage (3,4). With precautions, the specimens may be tilted to the implanting beam so that the implanted ions provide an ultrafine uniform shadowing for the specimen. Also, tilting effectively increases the thickness of the support film.400 mesh copper grids were covered with a 120Å formvar film, then carbonized with 50Å of carbon to provide the specimen support. The bacteriophage were then critical point dried (5) by first replacing the specimen water with ethanol, the ethanol by Freon 113 and the Freon 113 by Freon 13 which was then dried in a high pressure container.

Sensing the Critical Point of High-Pressure Mixtures

2004 ◽  
Vol 43 (39) ◽  
pp. 5192-5195 ◽  
Author(s):  
Jie Ke ◽  
Robert M. Oag ◽  
P. J. King ◽  
Michael W. George ◽  
Martyn Poliakoff
Keyword(s):  
High Pressure ◽  
Critical Point
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