Enhancement of Crystallization Processes by Power Ultrasound: Current State‐of‐the‐Art and Research Advances

Zhang, Zi; Sun, Da‐Wen; Zhu, Zhiwei; Cheng, Liang

doi:10.1111/1541-4337.12132

Cited by 100 publications

(59 citation statements)

References 107 publications

(194 reference statements)

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“…In situ seeding of ice crystals using ultrasound is also of interest for the food industry . For obvious reasons it is impossible to add seeds during freezing of food stuffs.…”

Section: Us‐assisted Technologiesmentioning

confidence: 99%

“…In situ seeding of ice crystals using ultrasound is also of interest for the food industry. 15 For obvious reasons it is impossible to add seeds during freezing of food stuffs. Generating ice crystals by US during freezing of foodstuffs leads to smaller ice crystals and consequently less damage to the cellular structure and better preservation.…”

Section: Us-assisted Crystallizationmentioning

confidence: 99%

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Ultrasound‐assisted emerging technologies for chemical processes

Kiss

Geertman

Wierschem

et al. 2018

J of Chemical Tech & Biotech

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The chemical industry has witnessed many important developments during past decades largely enabled by process intensification techniques. Some of them are already proven at commercial scale (e.g. reactive distillation) while others (e.g. ultrasound‐assisted extraction/crystallization/reaction) are on their way to becoming the next‐generation technologies. This article focuses on the advances of ultrasound (US)‐assisted technologies that could lead in the near future to significant improvements in commercial activities. The aim is to provide an authoritative discussion on US‐assisted technologies that are currently emerging from the research environment into the chemical industry, as well as give an overview of the current state‐of‐the‐art applications of US in chemical processing (e.g. enzymatic reactive distillation, crystallization of API). Sufficient information is included to allow the assessment of US‐assisted technologies and the challenges for implementation, as well as their potential for commercial applications. © 2017 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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“…In situ seeding of ice crystals using ultrasound is also of interest for the food industry . For obvious reasons it is impossible to add seeds during freezing of food stuffs.…”

Section: Us‐assisted Technologiesmentioning

confidence: 99%

Section: Us-assisted Crystallizationmentioning

confidence: 99%

Ultrasound‐assisted emerging technologies for chemical processes

Kiss

Geertman

Wierschem

et al. 2018

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…There is considerable literature and interest in the use of high power ultrasound for the control of crystal nucleation [20][21][22][23][24][25] . Power ultrasound interacts with crystal nucleation and growth in a number of ways and in general is not well understood.…”

Section: Power Ultrasound and Sonocrystallisationmentioning

confidence: 99%

Nucleation in food colloids

Povey

2016

The Journal of Chemical Physics

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Nucleation in food colloids has been studied in detail using Ultrasound Spectroscopy. Our data shows that classical nucleation theory (CNT) remains a sound basis from which to understand nucleation in food colloids and analogous model systems using n-alkanes. Various interpretations and modifications of CNT are discussed with regard to their relevance to food colloids. Much of the evidence presented is based on ultrasound velocity spectrometry measurements which has many advantages for the study of nucleating systems compared to light scattering and NMR due to its sensitivity at low solid contents and its ability to measure true solid contents in the nucleation and early crystal growth stages. Ultrasound attenuation spectroscopy also responds to critical fluctuations in the induction region. We show however, that a periodic pressure fluctuation such as a quasi-continuous (as opposed to a pulse comprising only a few pressure cycles) ultrasound field can alter the nucleation process, even at very low acoustic intensity. Thus care must be taken when using ultrasound techniques that the measurements do not alter the studied processes. Quasi-continuous ultrasound fields may enhance or suppress nucleation and the criteria to determine such effects are derived. The conclusions of this paper are relevant to colloidal systems in foods, pharmaceuticals, agro-chemicals, cosmetics and personal products.

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“…The functional properties of the crystalline substances, such as their band gap, electrical and thermal conductivity, transparency, and chemical and thermal stability are not only dependent of the chemical composition and the basic crystal structure, but also depend on the characteristics of their crystallites, such as size and size distribution, preferential orientation, alignment, and number density [1][2][3][4][5][6][7][8]. This work focuses on the nucleation and crystallization of lead iodide (PbI 2 ), a semiconductor with numerous applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Ultrasonic Substrate Vibration on Nucleation and Crystallization of PbI2 Crystals and Thin Films

Zabihi

Eslamian

2018

Crystals

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Preparation of defect-free and well-controlled solution-processed crystalline thin films is highly desirable for emerging technologies, such as perovskite solar cells. In this work, using PbI 2 as a model solution with a vast variety of applications, we demonstrate that the excitation of a liquid thin film by imposed ultrasonic vibration on the film substrate significantly affects the nucleation and crystallization kinetics of PbI 2 and the morphology of the resulting solid thin film. It is found that by applying ultrasonic vibration to PbI 2 solution spun onto an ITO substrate with a moderate power and excitation duration (5 W and 1 min for the 40 kHz transducer used in this study), the nucleation rate increases and the crystals transform from 2D or planar to epitaxial 3D columnar structures, resulting in the suppression of crystallization dewetting. The effects of various induced physical phenomena as a result of the excitation by ultrasonic vibration are discussed, including microstreaming and micromixing, increased heat transfer and local temperature, a change in the thermodynamic state of the solution, and a decrease in the supersaturation point. It is shown that the ultrasonic-assisted solution deposition of the PbI 2 thin films is controllable and reproducible, a process which is low-cost and in line with the large-scale fabrication of such solution-processed thin films.

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Enhancement of Crystallization Processes by Power Ultrasound: Current State‐of‐the‐Art and Research Advances

Cited by 100 publications

References 107 publications

Ultrasound‐assisted emerging technologies for chemical processes

Ultrasound‐assisted emerging technologies for chemical processes

Nucleation in food colloids

Effect of the Ultrasonic Substrate Vibration on Nucleation and Crystallization of PbI2 Crystals and Thin Films

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