A Theoretical Study of the Phase Diagrams of Simple Fluids Confined within Narrow Pores†

Langmuir ◽  
1999 ◽  
Vol 15 (18) ◽  
pp. 5713-5721 ◽  
Author(s):  
E. V. Votyakov ◽  
Yu. K. Tovbin ◽  
J. M. D. MacElroy ◽  
A. Roche
Keyword(s):  
Phase Diagrams ◽  
Theoretical Study ◽  
Simple Fluids

scholarly journals Phase Diagrams of Instabilities in Compressed Film-Substrate Systems

2013 ◽  
Vol 81 (5) ◽  
Author(s):  
Qiming Wang ◽  
Xuanhe Zhao
Keyword(s):  
Phase Transitions ◽  
Film Thickness ◽  
Phase Diagrams ◽  
Stability Criterion ◽  
Theoretical Study ◽  
Membrane Stress ◽  
Substrate Adhesion ◽  
Elastic Film ◽  
Quantitative Understanding ◽  
Film Substrate

Subject to a compressive membrane stress, an elastic film bonded on a substrate can become unstable, forming wrinkles, creases or delaminated buckles. Further increasing the compressive stress can induce advanced modes of instabilities including period-doubles, folds, localized ridges, delamination, and coexistent instabilities. While various instabilities in film-substrate systems under compression have been analyzed separately, a systematic and quantitative understanding of these instabilities is still elusive. Here we present a joint experimental and theoretical study to systematically explore the instabilities in elastic film-substrate systems under uniaxial compression. We use the Maxwell stability criterion to analyze the occurrence and evolution of instabilities analogous to phase transitions in thermodynamic systems. We show that the moduli of the film and the substrate, the film-substrate adhesion strength, the film thickness, and the prestretch in the substrate determine various modes of instabilities. Defects in the film-substrate system can facilitate it to overcome energy barriers during occurrence and evolution of instabilities. We provide a set of phase diagrams to predict both initial and advanced modes of instabilities in compressed film-substrate systems. The phase diagrams can be used to guide the design of film-substrate systems to achieve desired modes of instabilities.

scholarly journals Phase diagrams of ‘‘simple’’ fluids with extreme pair potentials

1994 ◽  
Vol 73 (5) ◽  
pp. 752-755 ◽  
Author(s):  
C. F. Tejero ◽  
A. Daanoun ◽  
H. N. W. Lekkerkerker ◽  
M. Baus
Keyword(s):  
Phase Diagrams ◽  
Simple Fluids ◽  
Pair Potentials

Tuning the miscibility of water in imide-based ionic liquids

2020 ◽  
Vol 22 (43) ◽  
pp. 25236-25242
Author(s):  
Andreia S. L. Gouveia ◽  
Carlos E. S. Bernardes ◽  
Alexander S. Shaplov ◽  
Elena I. Lozinskaya ◽  
José N. Canongia Lopes ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Phase Diagrams ◽  
Theoretical Study

Experimental and theoretical study on mixtures of water with ionic liquids exhibiting unusual temperature concentration phase diagrams.

Transmission electron microscope studies in special ceramics

1978 ◽  
Vol 36 (1) ◽  
pp. 268-269
Author(s):  
A. Zangvil ◽  
L.J. Gauckler ◽  
G. Schneider ◽  
M. Rühle
Keyword(s):  
Phase Diagrams ◽  
Crystal Structures ◽  
Thin Foil ◽  
Limited Extent ◽  
Complex Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
Lattice Resolution

The use of high temperature special ceramics which are usually complex materials based on oxides, nitrides, carbides and borides of silicon and aluminum, is critically dependent on their thermomechanical and other physical properties. The investigations of the phase diagrams, crystal structures and microstructural features are essential for better understanding of the macro-properties. Phase diagrams and crystal structures have been studied mainly by X-ray diffraction (XRD). Transmission electron microscopy (TEM) has contributed to this field to a very limited extent; it has been used more extensively in the study of microstructure, phase transformations and lattice defects. Often only TEM can give solutions to numerous problems in the above fields, since the various phases exist in extremely fine grains and subgrain structures; single crystals of appreciable size are often not available. Examples with some of our experimental results from two multicomponent systems are presented here. The standard ion thinning technique was used for the preparation of thin foil samples, which were then investigated with JEOL 200A and Siemens ELMISKOP 102 (for the lattice resolution work) electron microscopes.

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