scholarly journals Phase Behavior, Formation, and Rheology of Cubic Phase and Related Gel Emulsion in Tween80/Water/Oil Systems

2009 ◽  
Vol 58 (7) ◽  
pp. 361-367 ◽  
Author(s):  
Mohammad Mydul Alam ◽  
Kousuke Ushiyama ◽  
Kenji Aramaki
Keyword(s):  
Phase Behavior ◽  
Cubic Phase

Phase Behavior and Formation of Reverse Cubic Phase Based Emulsion in Water/Poly(oxyethylene) Poly(dimethylsiloxane) Surfactants/Silicone Oil Systems

Langmuir ◽  
2001 ◽  
Vol 17 (17) ◽  
pp. 5169-5175 ◽  
Author(s):  
Md. Hemayet Uddin ◽  
Carlos Rodríguez ◽  
Kenichi Watanabe ◽  
Arturo López-Quintela ◽  
Tadashi Kato ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Silicone Oil ◽  
Cubic Phase

scholarly journals Phase behavior and thermoelastic properties of SnMo2O8under hydrostatic pressure

2014 ◽  
Vol 70 (a1) ◽  
pp. C156-C156
Author(s):  
Leighanne Gallington ◽  
Angus Wilkinson ◽  
Luiza Rosa de Araujo ◽  
John Evans
Keyword(s):  
Thermal Expansion ◽  
Phase Behavior ◽  
Negative Thermal Expansion ◽  
Cubic Phase ◽  
Thermoelastic Properties ◽  
Cubic Symmetry ◽  
X Ray ◽  
High Temperature Form ◽  
Sample Environment

SnMo2O8has been shown to exhibit very different phase behavior and thermal expansion from previously studied members of the AM2O8family.1At high temperatures, SnMo2O8, ZrW2O8, and ZrMo2O8assume cubic structures with orientationally disordered MO4tetrahedra; however, their behavior is widely divergent at lower temperatures. ZrMo2O8maintains its disordered structure and continues to display negative thermal expansion (NTE). While cubic symmetry is retained when cooling ZrW2O8, its WO4tetrahedra become ordered, and its NTE increases in magnitude. Rapid cooling of SnMo2O8leads to a cubic structure that only minimally differs from its high temperature form.1Slowly heating this cubic phase results in a transformation to a rhombohedral (γ) structure with ordered MoO4tetrahedra that is not isostructural to any known phases of ZrW2O8and ZrMo2O8.1In stark contrast to ZrW2O8, and ZrMo2O8, all SnMo2O8phases exhibit positive thermal expansion.1In the current work, the phase behavior and thermoelastic properties of cubic SnMo2O8under hydrostatic conditions were investigated via in situ synchrotron x-ray powder diffraction in a recently designed sample environment.2Previous studies of ZrW2O8and ZrMo2O8in this environment have shown that pressure-induced disordering of MO4tetrahedra, which only occurred in the orientationally ordered low temperature ZrW2O8phase, was linked to both elastic softening on heating and enhancement of NTE.3At 298K, cubic SnMo2O8is significantly softer (κT =30GPa) than ZrW2O8 (64GPa) and ZrMo2O8(43GPa).3Unlike ZrW2O8, which softens upon heating to 516K (ΔκT = -9GPa), SnMo2O8stiffens (+5GPa) more than ZrMo2O8(+2GPa).3The phase behavior of SnMo2O8under pressure also differs from that of ZrW2O8and ZrMo2O8. Compression elevated the γ->cubic transition temperature significantly: at ambient temperature, this transition occurs at ~435K; at 310MPa, it occurs at ~490K.

scholarly journals Phase Behavior of Polyglycerin Fatty Acid Ester in a Water-Oil System and Formulations of Gel-Emulsions Stabilized by the Cubic Phase

2000 ◽  
Vol 49 (6) ◽  
pp. 617-624,644 ◽  
Author(s):  
Hironobu KUNIEDA ◽  
Kenji ARAMAKI ◽  
Takayuki NISHIMURA ◽  
Masahiko ISHITOBI
Keyword(s):  
Fatty Acid ◽  
Phase Behavior ◽  
Fatty Acid Ester ◽  
Acid Ester ◽  
Cubic Phase

Phase behavior and rheology of oil-swollen micellar cubic phase and gel emulsions in nonionic surfactant systems

2010 ◽  
Vol 341 (2) ◽  
pp. 267-272 ◽  
Author(s):  
Mohammad Mydul Alam ◽  
Yuki Sugiyama ◽  
Kei Watanabe ◽  
Kenji Aramaki
Keyword(s):  
Phase Behavior ◽  
Nonionic Surfactant ◽  
Cubic Phase ◽  
Surfactant Systems

Aqueous-Phase Behavior and Cubic Phase-Containing Emulsions in the C12E2−Water System

Langmuir ◽  
2000 ◽  
Vol 16 (7) ◽  
pp. 3537-3542 ◽  
Author(s):  
Matthew L. Lynch ◽  
Kelly A. Kochvar ◽  
Janet L. Burns ◽  
Robert G. Laughlin
Keyword(s):  
Phase Behavior ◽  
Aqueous Phase ◽  
Water System ◽  
Cubic Phase

Ab Initio Studies On Phase Behavior of Barium Titanate

2002 ◽  
Vol 718 ◽  
Author(s):  
Mustafa Uludogan ◽  
Tahir Cagin ◽  
William A. Goddard
Keyword(s):  
Equation Of State ◽  
Barium Titanate ◽  
Ab Initio ◽  
Phase Transformations ◽  
Phase Behavior ◽  
Tetragonal Phase ◽  
Structure Equation ◽  
Cubic Phase ◽  
Orthorhombic Structure ◽  
Dft Methods

AbstractUsing DFT methods we have studied structure, equation of state, and phase behavior of BaTiO3. We have identified the pressure induced phase transformations from the rhombohedral to orthorhombic structure at ca. 5 GPa and from tetragonal phase to cubic phase at ca. 7.5 GPa.

Use of fractals to describe microstructures of porous thick-film platinum electrodes

1992 ◽  
Vol 50 (1) ◽  
pp. 314-315
Author(s):  
Steven D. Toteda
Keyword(s):  
Fractal Dimension ◽  
Power Plants ◽  
Electrical Response ◽  
Cubic Phase ◽  
Platinum Electrodes ◽  
Fine Grained ◽  
Impedance Response ◽  
Platinum Particles ◽  
Energy Surfaces ◽  
Highly Porous

Zirconia oxygen sensors, in such applications as power plants and automobiles, generally utilize platinum electrodes for the catalytic reaction of dissociating O2 at the surface. The microstructure of the platinum electrode defines the resulting electrical response. The electrode must be porous enough to allow the oxygen to reach the zirconia surface while still remaining electrically continuous. At low sintering temperatures, the platinum is highly porous and fine grained. The platinum particles sinter together as the firing temperatures are increased. As the sintering temperatures are raised even further, the surface of the platinum begins to facet with lower energy surfaces. These microstructural changes can be seen in Figures 1 and 2, but the goal of the work is to characterize the microstructure by its fractal dimension and then relate the fractal dimension to the electrical response. The sensors were fabricated from zirconia powder stabilized in the cubic phase with 8 mol% percent yttria. Each substrate was sintered for 14 hours at 1200°C. The resulting zirconia pellets, 13mm in diameter and 2mm in thickness, were roughly 97 to 98 percent of theoretical density. The Engelhard #6082 platinum paste was applied to the zirconia disks after they were mechanically polished ( diamond). The electrodes were then sintered at temperatures ranging from 600°C to 1000°C. Each sensor was tested to determine the impedance response from 1Hz to 5,000Hz. These frequencies correspond to the electrode at the test temperature of 600°C.

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