Arrested Solid-Solid Phase Transition in Semiconductor Nanocrystals

1990 ◽  
Vol 206 ◽  
Author(s):  
M. Haase ◽  
A. P. Alivisatos
Keyword(s):  
Phase Transition ◽  
Optical Absorption ◽  
Functional Form ◽  
Abrupt Change ◽  
Solid Phase ◽  
Semiconductor Nanocrystals ◽  
Average Diameter ◽  
Solid Phase Transition ◽  
Image Position ◽  
Cds Crystallites

ABSTRACTCdS crystallites of 40 and 45 Å average diameter have been studied under hydrostatic high pressure by optical absorption. The optical absorption onset is observed to shift to higher energy with pressure according toThis is exactly the same shift with pressure as is observed in the bulk. The solid-solid phase transition from the zincblende to the NaCl phase is observed as an abrupt change in the intensity, intercept, and functional form of the absorption onset. The phase transition, which occurs at 27Kbar in bulk CdS, is shifted to 85 Kbar in nanocrystals stabilized with polyphosphate, and to 60 Kbar in nanocrystals surface derivatized with EDTA. It thus appears possible to control the relative stability of the crystalline phases of a nanocrystal by chemical manipulation of the surface.

Solidification of Ionic Liquids: Theory and Techniques

2010 ◽  
Vol 63 (4) ◽  
pp. 544 ◽  
Author(s):  
Anja-Verena Mudring
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Solid Phase ◽  
Soft Materials ◽  
Separation Science ◽  
Vast Number ◽  
Plastic Crystals ◽  
Thermal Fluids ◽  
Solid Phase Transition

Ionic liquids (ILs) have become an important class of solvents and soft materials over the past decades. Despite being salts built by discrete cations and anions, many of them are liquid at room temperature and below. They have been used in a wide variety of applications such as electrochemistry, separation science, chemical synthesis and catalysis, for breaking azeotropes, as thermal fluids, lubricants and additives, for gas storage, for cellulose processing, and photovoltaics. It has been realized that the true advantage of ILs is their modular character. Each specific cation–anion combination is characterized by a unique, characteristic set of chemical and physical properties. Although ILs have been known for roughly a century, they are still a novel class of compounds to exploit due to the vast number of possible ion combinations and one fundamental question remains still inadequately answered: why do certain salts like ILs have such a low melting point and do not crystallize readily? This Review aims to give an insight into the liquid–solid phase transition of ILs from the viewpoint of a solid-state chemist and hopes to contribute to a better understanding of this intriguing class of compounds. It will introduce the fundamental theories of liquid–solid-phase transition and crystallization from melt and solution. Aside form the formation of ideal crystals the development of solid phases with disorder and of lower order like plastic crystals and liquid crystals by ionic liquid compounds are addressed. The formation of ionic liquid glasses is discussed and finally practical techniques, strategies and methods for crystallization of ionic liquids are given.

Solid–solid phase transition study of ε-CL-20/binder composites

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 859-865 ◽  
Author(s):  
Changping Guo ◽  
Dunju Wang ◽  
Bing Gao ◽  
Jun Wang ◽  
Bo Luo ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid Phase ◽  
Solid Phase Transition ◽  
Transition Study ◽  
Dsc Curves

The comparison of solid–solid phase transition (ε → γ polymorph) of CL-20 and Cl-20/composites revealed by DSC curves.

scholarly journals A Liquid-to-Solid Phase Transition of the ALS Protein FUS Accelerated by Disease Mutation

Cell ◽  
2015 ◽  
Vol 162 (5) ◽  
pp. 1066-1077 ◽  
Author(s):  
Avinash Patel ◽  
Hyun O. Lee ◽  
Louise Jawerth ◽  
Shovamayee Maharana ◽  
Marcus Jahnel ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solid Phase ◽  
Disease Mutation ◽  
Solid Phase Transition
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