scholarly journals Surface-wetting effects on the liquid–liquid transition of a single-component molecular liquid

2010 ◽  
Vol 1 (1) ◽  
Author(s):  
Ken-ichiro Murata ◽  
Hajime Tanaka
Keyword(s):  
Single Component ◽  
Surface Wetting ◽  
Molecular Liquid ◽  
Liquid Transition

scholarly journals Microscopic identification of the order parameter governing liquid–liquid transition in a molecular liquid

2015 ◽  
Vol 112 (19) ◽  
pp. 5956-5961 ◽  
Author(s):  
Ken-ichiro Murata ◽  
Hajime Tanaka
Keyword(s):  
Order Parameter ◽  
Structural Evolution ◽  
Characteristic Size ◽  
Number Density ◽  
Time Resolved ◽  
X Ray ◽  
Molecular Liquid ◽  
X Ray Scattering ◽  
Liquid Transition ◽  
Scattering Measurements

A liquid–liquid transition (LLT) in a single-component substance is an unconventional phase transition from one liquid to another. LLT has recently attracted considerable attention because of its fundamental importance in our understanding of the liquid state. To access the order parameter governing LLT from a microscopic viewpoint, here we follow the structural evolution during the LLT of an organic molecular liquid, triphenyl phosphite (TPP), by time-resolved small- and wide-angle X-ray scattering measurements. We find that locally favored clusters, whose characteristic size is a few nanometers, are spontaneously formed and their number density monotonically increases during LLT. This strongly suggests that the order parameter of LLT is the number density of locally favored structures and of nonconserved nature. We also show that the locally favored structures are distinct from the crystal structure and these two types of orderings compete with each other. Thus, our study not only experimentally identifies the structural order parameter governing LLT, but also may settle a long-standing debate on the nature of the transition in TPP, i.e., whether the transition is LLT or merely microcrystal formation.

scholarly journals Polyamorphism Mirrors Polymorphism in the Liquid–Liquid Transition of a Molecular Liquid

2020 ◽  
Author(s):  
Finlay Walton ◽  
John Bolling ◽  
Andrew Farrell ◽  
Jamie MacEwen ◽  
Christopher Syme ◽  
...  
Keyword(s):  
Order Parameter ◽  
Supercooled Liquid ◽  
Supercooled Liquids ◽  
Molecular Packing ◽  
Single Component ◽  
Triphenyl Phosphite ◽  
Amorphous Phases ◽  
Geometrically Frustrated ◽  
Intimate Connection ◽  
Liquid Transition

Liquid-liquid transitions between two amorphous phases in a single-component liquid (polyamorphism) have defied explanation and courted controversy. All known examples of liquid–liquid transitions have been observed in the supercooled liquid suggesting an intimate connection with vitrification and locally favored structures inhibiting crystallization. However, there is precious little information about the local molecular packing in supercooled liquids meaning that the order parameter of the transition is still unknown. Here, we investigate the liquid–liquid transition in triphenyl phosphite and show that it is caused by the competition between liquid structures that mirror two crystal polymorphs. The liquid–liquid transition is found to be between a geometrically frustrated liquid to a dynamically frustrated glass. These results indicate a general link between polymorphism and polyamorphism and will lead to a much greater understanding of the physical basis of liquid–liquid transitions and allow the discovery of other examples.

scholarly journals Polyamorphism Mirrors Polymorphism in the Liquid–Liquid Transition of a Molecular Liquid

2019 ◽  
Author(s):  
Finlay Walton ◽  
John Bolling ◽  
Andrew Farrell ◽  
Jamie MacEwen ◽  
Christopher Syme ◽  
...  
Keyword(s):  
Order Parameter ◽  
Supercooled Liquid ◽  
Supercooled Liquids ◽  
Molecular Packing ◽  
Single Component ◽  
Triphenyl Phosphite ◽  
Amorphous Phases ◽  
Geometrically Frustrated ◽  
Intimate Connection ◽  
Liquid Transition

Liquid-liquid transitions between two amorphous phases in a single-component liquid (polyamorphism) have defied explanation and courted controversy. All known examples of liquid–liquid transitions have been observed in the supercooled liquid suggesting an intimate connection with vitrification and locally favored structures inhibiting crystallization. However, there is precious little information about the local molecular packing in supercooled liquids meaning that the order parameter of the transition is still unknown. Here, we investigate the liquid–liquid transition in triphenyl phosphite and show that it is caused by the competition between liquid structures that mirror two crystal polymorphs. The liquid–liquid transition is found to be between a geometrically frustrated liquid to a dynamically frustrated glass. These results indicate a general link between polymorphism and polyamorphism and will lead to a much greater understanding of the physical basis of liquid–liquid transitions and allow the discovery of other examples.

scholarly journals Order Parameter of the Liquid–Liquid Transition in a Molecular Liquid

2014 ◽  
Vol 6 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Joanna Mosses ◽  
Christopher D. Syme ◽  
Klaas Wynne
Keyword(s):  
Order Parameter ◽  
Molecular Liquid ◽  
Liquid Transition

Solid–liquid transition of charge-stabilized colloidal dispersions: a single-component structure-function approach

2004 ◽  
Vol 82 (5) ◽  
pp. 357-366 ◽  
Author(s):  
S Zhou
Keyword(s):  
Colloidal Particles ◽  
Hard Core ◽  
Colloidal Dispersions ◽  
Single Component ◽  
Component Structure ◽  
Liquid Transition ◽  
Screened Coulomb Potential ◽  
Solvent Molecules ◽  
Solid Liquid ◽  
Good Agreement

We have extended the Raveché–Mountain–Streett one-phasecriterion that governs the freezing of Lennard-Jones systems to a hard-core repulsive Yukawa-model (HCRYM) system. We find in the framework of the Rogers–Young (RY) approximation for an Ornstein–Zernike integral equation that an HCRYM fluid freezes when the ratio α = g(rmin)/g(rmax), where rmax is the distance corresponding to the maximum in the radial distribution function g(r) and rmin is the distance corresponding to the subsequent minimum in g(r), is approximately 0.215. To describe the freezing of charge-stabilized colloidal dispersions in electrolytes, which consist of colloidal macroions,electrolyte small ions, and solvent molecules, we employ the single-component model in which the colloidal particles interact through the effective screened Coulomb potential of Belloni. Whenthe macroion surface effective charge number is taken as an adjustable parameter, the theoretical freezing line predicted by the RY g(rmin)/g(rmax) = 0.215 Raveché–Mountain–Streett one-phase criterion is in very good agreement with the corresponding experimental data.PACS Nos.: 61.25.Em, 61.20.Gy

scholarly journals Polyamorphism Mirrors Polymorphism in the Liquid–Liquid Transition of a Molecular Liquid

2020 ◽  
Vol 142 (16) ◽  
pp. 7591-7597 ◽  
Author(s):  
Finlay Walton ◽  
John Bolling ◽  
Andrew Farrell ◽  
Jamie MacEwen ◽  
Christopher D. Syme ◽  
...  
Keyword(s):  
Molecular Liquid ◽  
Liquid Transition
Sign in / Sign up

Export Citation Format

Share Document