Interface instability modes in freezing colloidal suspensions: revealed from onset of planar instability

Wang, Lilin; You, Jiaxue; Wang, Zhijun; Wang, Jincheng; Lin, Xin

doi:10.1038/srep23358

Cited by 16 publications

(22 citation statements)

References 30 publications

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“…Based on the above systematic measurements, the PCS is minor in both static and dynamic cases; in contrast, the effect of SCS caused by additives in the solvent is dominant. Accordingly, the thermodynamic effect of particles from the PCS is not the fundamental physical mechanism for cellular growth and lamellar structure that are associated with the solidification of colloidal suspensions 48 which inevitably contains a large number of solutes, especially in the ice-templating method. Nevertheless, when the effect of solutes is absent, some other effects such as the force interactions between particles and freezing interface perhaps should be considered to reveal the pattern of intermittent lenses 48 .…”

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confidence: 99%

“…Accordingly, the thermodynamic effect of particles from the PCS is not the fundamental physical mechanism for cellular growth and lamellar structure that are associated with the solidification of colloidal suspensions 48 which inevitably contains a large number of solutes, especially in the ice-templating method. Nevertheless, when the effect of solutes is absent, some other effects such as the force interactions between particles and freezing interface perhaps should be considered to reveal the pattern of intermittent lenses 48 . The present experimental results clearly demonstrate that the effects of additives are dominant in the ice-templating process 12 13 17 48 .…”

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confidence: 99%

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Interfacial undercooling in solidification of colloidal suspensions: analyses with quantitative measurements

You

Wang

et al. 2016

Sci Rep

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Interfacial undercooling in the complex solidification of colloidal suspensions is of significance and remains a puzzling problem. Two types of interfacial undercooling are supposed to be involved in the freezing of colloidal suspensions, i.e., solute constitutional supercooling (SCS) caused by additives in the solvent and particulate constitutional supercooling (PCS) caused by particles. However, quantitative identification of the interfacial undercooling in the solidification of colloidal suspensions, is still absent; thus, the question of which type of undercooling is dominant in this complex system remains unanswered. Here, we quantitatively measured the static and dynamic interface undercoolings of SCS and PCS in ideal and practical colloidal systems. We show that the interfacial undercooling primarily comes from SCS caused by the additives in the solvent, while PCS is minor. This finding implies that the thermodynamic effect of particles from the PCS is not the fundamental physical mechanism for pattern formation of cellular growth and lamellar structure in the solidification of colloidal suspensions, a general case of ice-templating method. Instead, the patterns in the ice-templating method can be controlled effectively by adjusting the additives.

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confidence: 99%

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Interfacial undercooling in solidification of colloidal suspensions: analyses with quantitative measurements

You

Wang

et al. 2016

Sci Rep

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“…In this metastable condition, perturbations at the liquid-solid interface cause ice to grow in the form of lamellae [110], while, in the absence of supercooling, perturbations melt back into the planar interface [110][111][112]. In general, solute-driven supercooling, due to the presence of additives, tends to be stronger than particle-driven supercooling [111,113,114]. In this review, we highlight important aspects of external field assisted freeze casting, focusing on the theory and experimental results.…”

Section: Constitutional Supercoolingmentioning

confidence: 99%

“…In such cases, the mode of instability changes from Mullins-Serkerka to local split and global split modes [111,159].…”

Section: Forces Exerted During Solidificationmentioning

confidence: 99%

External Field Assisted Freeze Casting

Niksiar

Frank

et al. 2019

Ceramics

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Freeze casting under external fields (magnetic, electric, or acoustic) produces porous materials having local, regional, and global microstructural order in specific directions. In freeze casting, porosity is typically formed by the directional solidification of a liquid colloidal suspension. Adding external fields to the process allows for structured nucleation of ice and manipulation of particles during solidification. External control over the distribution of particles is governed by a competition of forces between constitutional supercooling and electromagnetism or acoustic radiation. Here, we review studies that apply external fields to create porous ceramics with different microstructural patterns, gradients, and anisotropic alignments. The resulting materials possess distinct gradient, core–shell, ring, helical, or long-range alignment and enhanced anisotropic mechanical properties.

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“…These results indicate that the previous theoretical investigations of frozen fringe did not completely elucidate the ice lens growth. Based on the recent experimental work on ice lens formation, the growth of ice spear in the defect of particle packing ahead the solid/liquid interface may be one of the key procedures in the ice-lensing [13]. The instability of the water/ice interface will be the key clues in the theoretical analyses of ice lens formation.…”

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Reconsidering the Clapeyron equation in the freezing of colloidal suspensions: From macroscale to the microscale

Wang

2017

Eur. Phys. J. E

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A long controversy of ice lensing exists in the research of frost heave. By elucidating the mechanical and thermodynamic equilibria at the interface, the thermodynamics of the water/ice interface is revealed from macroscale to microscale for the freezing of colloidal suspensions. The application of the Clapeyron equation is confirmed both at macroscale to microscale via curvature effect. The origin of ice lensing/banding can be initialized from the growth of pore ice in the interpretation of thermodynamics at the interface, even without the traditional mechanical analyses. It is also proposed that the packing status of the porous structure in the particle layer ahead of the water/ice interface determines the ice lensing behaviors. The results presented here show different scenarios compared with previous theoretical investigations of frost heave, and may shed light on the researches of this area.

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Interface instability modes in freezing colloidal suspensions: revealed from onset of planar instability

Cited by 16 publications

References 30 publications

Interfacial undercooling in solidification of colloidal suspensions: analyses with quantitative measurements

Interfacial undercooling in solidification of colloidal suspensions: analyses with quantitative measurements

External Field Assisted Freeze Casting

Reconsidering the Clapeyron equation in the freezing of colloidal suspensions: From macroscale to the microscale

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