scholarly journals Liquid Phase Separation Mechanism of Cu-40 wt.% Pb Hypermonotectic Alloys

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
Xiaosi Sun ◽  
Weixin Hao ◽  
Teng Ma ◽  
Junting Zhang ◽  
Guihong Geng
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Ostwald Ripening ◽  
Liquid Phase Separation ◽  
Separation Mechanism ◽  
Leading Role ◽  
Miscibility Gaps ◽  
Solidification Microstructures ◽  
Hypermonotectic Alloy ◽  
Phase Separation Mechanism

Solidification microstructures of Cu-40 wt.% Pb alloy were examined under different undercooling degrees. The liquid phase separation mechanism in the systems with stable miscibility gaps mainly involved Ostwald ripening, Brownian motion, Marangoni migration, and Stokes motion. Stokes had little influence on the liquid phase separation in the early phase and played a leading role in the later period. The liquid phase separation mechanism of Cu-40 wt.% Pb hypermonotectic alloy was illustrated in detail.

Assessment of the UCST-type liquid-liquid phase separation mechanism of imidazolium-based ionic liquid, [C8mim][TFSI], and 1,4-dioxane by SANS, NMR, IR, and MD simulations

2021 ◽  
Author(s):  
Masahiro Kawano ◽  
Koichiro Sadakane ◽  
Hiroki Iwase ◽  
Masaru Matsugami ◽  
Bogdan A MAREKHA ◽  
...  
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Binary Systems ◽  
Alkyl Chain ◽  
Md Simulations ◽  
Alkyl Chain Length ◽  
Liquid Phase Separation ◽  
Separation Mechanism ◽  
Phase Separation Mechanism ◽  
Liquid Liquid Phase Separation

Liquid–liquid phase separation of binary systems for imidazolium-based ionic liquids (ILs), 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Cnmim][TFSI], n represents the alkyl chain length of the cation) with 1,4-dioxane (1,4-DIO) has been observed as...

The liquid phase separation of Bi-Ga hypermonotectic alloy under acoustic levitation condition

2007 ◽  
Vol 52 (11) ◽  
pp. 1446-1450 ◽  
Author(s):  
ZhenYu Hong ◽  
YongJun Lü ◽  
WenJun Xie ◽  
BingBo Wei
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Liquid Phase Separation ◽  
Acoustic Levitation ◽  
Hypermonotectic Alloy

scholarly journals RNA transcription modulates phase transition-driven nuclear body assembly

2015 ◽  
Vol 112 (38) ◽  
pp. E5237-E5245 ◽  
Author(s):  
Joel Berry ◽  
Stephanie C. Weber ◽  
Nilesh Vaidya ◽  
Mikko Haataja ◽  
Clifford P. Brangwynne
Keyword(s):  
Phase Transition ◽  
Phase Separation ◽  
Liquid Phase ◽  
Ribosome Biogenesis ◽  
Ostwald Ripening ◽  
Nuclear Body ◽  
Nuclear Bodies ◽  
Separation Mechanism ◽  
Independent Manner

Nuclear bodies are RNA and protein-rich, membraneless organelles that play important roles in gene regulation. The largest and most well-known nuclear body is the nucleolus, an organelle whose primary function in ribosome biogenesis makes it key for cell growth and size homeostasis. The nucleolus and other nuclear bodies behave like liquid-phase droplets and appear to condense from the nucleoplasm by concentration-dependent phase separation. However, nucleoli actively consume chemical energy, and it is unclear how such nonequilibrium activity might impact classical liquid–liquid phase separation. Here, we combine in vivo and in vitro experiments with theory and simulation to characterize the assembly and disassembly dynamics of nucleoli in early Caenorhabditis elegans embryos. In addition to classical nucleoli that assemble at the transcriptionally active nucleolar organizing regions, we observe dozens of “extranucleolar droplets” (ENDs) that condense in the nucleoplasm in a transcription-independent manner. We show that growth of nucleoli and ENDs is consistent with a first-order phase transition in which late-stage coarsening dynamics are mediated by Brownian coalescence and, to a lesser degree, Ostwald ripening. By manipulating C. elegans cell size, we change nucleolar component concentration and confirm several key model predictions. Our results show that rRNA transcription and other nonequilibrium biological activity can modulate the effective thermodynamic parameters governing nucleolar and END assembly, but do not appear to fundamentally alter the passive phase separation mechanism.

scholarly journals Liquid Phase Separation in High-Entropy Alloys—A Review

Entropy ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 890 ◽  
Author(s):  
Nicholas Derimow ◽  
Reza Abbaschian
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Liquid Phase Separation ◽  
Miscibility Gap ◽  
Mixing Enthalpy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Entropy Of Mixing ◽  
Miscibility Gaps ◽  
Alloy Systems

It has been 14 years since the discovery of the high-entropy alloys (HEAs), an idea of alloying which has reinvigorated materials scientists to explore unconventional alloy compositions and multicomponent alloy systems. Many authors have referred to these alloys as multi-principal element alloys (MPEAs) or complex concentrated alloys (CCAs) in order to place less restrictions on what constitutes an HEA. Regardless of classification, the research is rooted in the exploration of structure-properties and processing relations in these multicomponent alloys with the aim to surpass the physical properties of conventional materials. More recent studies show that some of these alloys undergo liquid phase separation, a phenomenon largely dictated by low entropy of mixing and positive mixing enthalpy. Studies posit that positive mixing enthalpy of the binary and ternary components contribute substantially to the formation of liquid miscibility gaps. The objective of this review is to bring forth and summarize the findings of the experiments which detail liquid phase separation (LPS) in HEAs, MPEAs, and CCAs and to draw parallels between HEAs and the conventional alloy systems which undergo liquid-liquid separation. Positive mixing enthalpy if not compensated by the entropy of mixing will lead to liquid phase separation. It appears that Co, Ni, and Ti promote miscibility in HEAs/CCAs/MPEAs while Cr, V, and Nb will raise the miscibility gap temperature and increase LPS. Moreover, addition of appropriate amounts of Ni to CoCrCu eliminates immiscibility, such as in cases of dendritically solidifying CoCrCuNi, CoCrCuFeNi, and CoCrCuMnNi.

A Homogeneous Solidification Criterion for Undercooled Ni-20at%Pb Hypermonotectic Melts

2011 ◽  
Vol 695 ◽  
pp. 340-343
Author(s):  
Hui Xie ◽  
Gen Cang Yang ◽  
Lei Jia ◽  
Zhen Lin Lu
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Cooling Rate ◽  
Nucleation Rate ◽  
Volume Fraction ◽  
Liquid Phase Separation ◽  
Homogeneous Microstructure ◽  
Nucleation Barrier ◽  
Hypermonotectic Alloy ◽  
Liquid Liquid Phase Separation

The kinetic process of liquid-liquid phase separation in the undercooled Ni-20at%Pb hypermonotectic alloy melts was analyzed theoretically. The results showed that liquid-liquid separation could not be inhibited due to smaller nucleation barrier and bigger nucleation rate of Pb-rich droplets. In the course of liquid-liquid phase separation, the volume fraction of Pb-rich droplets was thought as a function of time or temperature. At a certain cooling rate, the volume fraction was mainly controlled by the undercooling of Ni-Pb hypermonotectic melts. Based on the above results, a homogeneous solidification criterion for the undercooled Ni-20at%Pb hypermonotectic alloy melts was developed. Such a criterion predicted that the homogeneous microstructure could be obtained at the undercooling 263K, and the experimental results accorded with the predicting ones on the whole.

scholarly journals Liquid-Liquid Phase Separation of Tau Driven by Hydrophobic Interaction Facilitates Fibrillization of Tau

2021 ◽  
Vol 433 (2) ◽  
pp. 166731
Author(s):  
Yanxian Lin ◽  
Yann Fichou ◽  
Andrew P. Longhini ◽  
Luana C. Llanes ◽  
Pengyi Yin ◽  
...  
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Hydrophobic Interaction ◽  
Liquid Phase Separation ◽  
Liquid Liquid Phase Separation

scholarly journals Amyloid Aggregation under the Lens of Liquid–Liquid Phase Separation

2020 ◽  
pp. 368-378
Author(s):  
Yanting Xing ◽  
Aparna Nandakumar ◽  
Aleksandr Kakinen ◽  
Yunxiang Sun ◽  
Thomas P. Davis ◽  
...  
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Liquid Phase Separation ◽  
Amyloid Aggregation ◽  
Liquid Liquid Phase Separation
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