Interfacial induction and regulation for microscale crystallization process: a critical review

Wu, Mengyuan; Yuan, Zhijie; Niu, Yuchao; Meng, Yingshuang; He, Gaohong; Jiang, Xiaobin

doi:10.1007/s11705-021-2129-8

Cited by 4 publications

(4 citation statements)

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“…The total porosity of the membrane dominates the transmembrane flux, and the transfer characteristics are related to the membrane pore characteristics. It includes pore size, pore size distribution and channel curvature [39]. Therefore, the membrane used in MCr not only serves as the interface for vapor transport, but also as the role for controlling the supersaturation, nucleation and crystal growth.…”

Section: Membrane Crystallization (Mcr)mentioning

confidence: 99%

Fluoropolymer Membranes for Membrane Distillation and Membrane Crystallization

Macedonio²,

Ursino³

et al. 2022

Polymers

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Fluoropolymer membranes are applied in membrane operations such as membrane distillation and membrane crystallization where hydrophobic porous membranes act as a physical barrier separating two phases. Due to their hydrophobic nature, only gaseous molecules are allowed to pass through the membrane and are collected on the permeate side, while the aqueous solution cannot penetrate. However, these two processes suffer problems such as membrane wetting, fouling or scaling. Membrane wetting is a common and undesired phenomenon, which is caused by the loss of hydrophobicity of the porous membrane employed. This greatly affects the mass transfer efficiency and separation efficiency. Simultaneously, membrane fouling occurs, along with membrane wetting and scaling, which greatly reduces the lifespan of the membranes. Therefore, strategies to improve the hydrophobicity of membranes have been widely investigated by researchers. In this direction, hydrophobic fluoropolymer membrane materials are employed more and more for membrane distillation and membrane crystallization thanks to their high chemical and thermal resistance. This paper summarizes different preparation methods of these fluoropolymer membrane, such as non-solvent-induced phase separation (NIPS), thermally-induced phase separation (TIPS), vapor-induced phase separation (VIPS), etc. Hydrophobic modification methods, including surface coating, surface grafting and blending, etc., are also introduced. Moreover, the research advances on the application of less toxic solvents for preparing these membranes are herein reviewed. This review aims to provide guidance to researchers for their future membrane development in membrane distillation and membrane crystallization, using fluoropolymer materials.

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Section: Membrane Crystallization (Mcr)mentioning

confidence: 99%

Fluoropolymer Membranes for Membrane Distillation and Membrane Crystallization

Macedonio²,

Ursino³

et al. 2022

Polymers

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“…The key step is the initial construction of a “privileged microenvironment” for the micro‐mixing of reactant and mass transfer of crystallization components, [ 4 ] ensuring the stable reactive rate and maintaining stable‐morphosynthesis procedure. [ 5 ] One of the classic strategies of the biomimetic morphosynthesis of inorganic materials with complex forms is using organic templates and/or polymer additives to regulate the reactant diffusion and ion interfacial growth in the mixed solution system. [ 6 ] For example, calcite hollow spheres, vaterite discs, and calcite pine‐cone‐shaped particles have also been produced in the mixed polymer‐surfactant systems, [ 7 ] while the mixture reactive solution with organic templates and/or polymer additives leads to the new problems of subsequent separation, inconvenience of continuous operation, increased manufacture cost, etc.…”

Section: Introductionmentioning

confidence: 99%

“…[ 8 ] Taking the membrane as the mass transfer interface and controlling the transfer direction of ions in the membrane is expected to bring a new breakthrough in complex reactive crystallization regulation. [ 5,9 ] Compared with traditional membranes, Janus membranes (JMs) have asymmetric properties on each side (hydrophobic/hydrophilic or positive/negative surface charge), which could provide an intrinsic “inner” driving force and potential gating effect to influence the transport behavior of liquid/ion. [ 10 ] In recent years, JMs with asymmetrical wetting structures have received most of the attention in diverse research fields of ultrafast water transportation, salt separation, and energy‐efficient utilization, including boosting solar steam towards high‐efficiency water collection and salt‐rejecting interfacial solar desalination.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Tunable Morphosynthesis of Calcium Carbonate in Aqueous Solution Enabled by Janus Membrane

Yuan

et al. 2022

Adv Funct Materials

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Targeted and high throughput manufacture of crystalline biominerals with diverse morphologies is of importance, due to the significant impact of shape and texture on the material properties, while tunable morphosynthesis of crystalline is restrained by the proper ion transfer process during the reactive crystallization, and is commonly regulated using organic soluble additives. Herein, Janus membranes (JMs) are facilely produced for the continuous confined reactive crystallization of calcium carbonate. Fabricated JM simultaneously achieves rapid and uniform directional CO32− ions transfer in the aqueous solution through the straight, uniform nanoscale hydrophilic channels, and the interfacial reactive crystallization is generated with confined ion adsorption and gating effect at the hydrophobic side. Hollow CaCO3 microcomposites via JM system are continuously and directly synthesized in the aqueous system without any assisted organic solvent or polymer additive, which is green and highly efficient. In addition, the reversed ion transfer direction in JM can be ideally managed resulting in highly selective manufacturing of cube or sphere‐type microcomposites. This study provides a feasible route for the rapid production of advanced particle materials with tunable morphology, displaying great potential applications of JM in material engineering.

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