Hierarchical multiscale hyperporous block copolymer membranes via tunable dual-phase separation

The rational design and realization of revolutionary porous structures have been long-standing challenges in membrane science. We demonstrate a new class of amphiphilic polystyrene-block-poly(4-vinylpyridine) block copolymer (BCP)–based porous membranes featuring hierarchical multiscale hyperporous structures. The introduction of surface energy–modifying agents and the control of major phase separation parameters (such as nonsolvent polarity and solvent drying time) enable tunable dual-phase separation of BCPs, eventually leading to macro/nanoscale porous structures and chemical functionalities far beyond those accessible with conventional approaches. Application of this BCP membrane to a lithium-ion battery separator affords exceptional improvement in electrochemical performance. The dual-phase separation–driven macro/nanopore construction strategy, owing to its simplicity and tunability, is expected to be readily applicable to a rich variety of membrane fields including molecular separation, water purification, and energy-related devices.

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Surface-modified electrospun polyacrylonitrile nano-membrane for a lithium-ion battery separator based on phase separation mechanism

Chemical Engineering Journal ◽

10.1016/j.cej.2020.125646 ◽

2020 ◽

Vol 398 ◽

pp. 125646

Author(s):

Ting Dong ◽

Waqas Ul Arifeen ◽

Jungwook Choi ◽

Kisoo Yoo ◽

Taejo Ko

Keyword(s):

Phase Separation ◽

Lithium Ion Battery ◽

Lithium Ion ◽

Separation Mechanism ◽

Battery Separator ◽

Surface Modified ◽

Phase Separation Mechanism

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Carboxyl-functionalized nanochannels based on block copolymer hierarchical structures

Faraday Discussions ◽

10.1039/c8fd00015h ◽

2018 ◽

Vol 209 ◽

pp. 303-314 ◽

Cited By ~ 3

Author(s):

Valentina-Elena Musteata ◽

Stefan Chisca ◽

Florian Meneau ◽

Detlef-M. Smilgies ◽

Suzana P. Nunes

Keyword(s):

Phase Separation ◽

Block Copolymer ◽

Block Copolymers ◽

Growth Mechanism ◽

Butyl Acrylate ◽

Hierarchical Structures ◽

Nucleation And Growth ◽

Porous Structures ◽

Hexagonally Ordered ◽

Nucleation And Growth Mechanism

Hierarchical isotropic porous structures with spherical micrometer-sized cavities, interconnected by hexagonally ordered nanochannels, were prepared based on the phase separation of polystyrene-b-poly(t-butyl acrylate) block copolymers, following a nucleation and growth mechanism.

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Dual-Phase Separation in a Semiconfined System: Monodispersed Heterogeneous Block-Copolymer Membranes for Cell Encoding and Patterning

Advanced Materials ◽

10.1002/adma.201605932 ◽

2017 ◽

Vol 29 (19) ◽

pp. 1605932 ◽

Cited By ~ 4

Author(s):

Xiuyu Wang ◽

Xueyan Feng ◽

Guiping Ma ◽

Di Zhang ◽

Yahong Chai ◽

...

Keyword(s):

Phase Separation ◽

Block Copolymer ◽

Dual Phase

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Evolution of Internal Stress in Heterogeneous Electrode Composite during the Drying Process

Energies ◽

10.3390/en14061683 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1683

Author(s):

Zuoquan Zhu ◽

Yaolong He ◽

Hongjiu Hu ◽

Fangzhou Zhang

Keyword(s):

Internal Stress ◽

Vinylidene Fluoride ◽

Influence Factors ◽

Lithium Ion ◽

Integrated Analysis ◽

Drying Time ◽

Component Distribution ◽

Poly Vinylidene Fluoride ◽

Inactive Ingredients ◽

Main Influence

The mechanical behavior of electrode composite during the drying preparation has played a crucial role in the electrochemical performance of lithium-ion batteries (LIBs). Our work aimed at developing an integrated analysis method to study the component distribution, mechanical properties, and internal stress of composite coating in the process of electrode drying. The main influence factors of drying stress were thoroughly investigated. It was found that this present model could capture not only the heterogeneity effect of inactive ingredients but also the porosity-dependent viscoelasticity of electrode composite. Meanwhile, the calculated effective modulus and stress evolution upon drying time were in acceptable accord with the experimental data. Furthermore, the rapid solidification markedly increased the drying stress in electrodes and significantly impaired the tensile strength of electrode composite due to the highly gradient distributed constituents. However, the stress level at high drying temperature could be significantly reduced by an aqueous sodium alginate binder instead of poly(vinylidene fluoride). The obtained results will be a great help in efficiently manufacturing LIB electrodes with adequate mechanical integrity.

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Interfacial properties between ionic‐liquid‐based electrolytes and lithium‐ion‐battery separator

AIChE Journal ◽

10.1002/aic.17208 ◽

2021 ◽

Author(s):

Yanjun Sun ◽

Jian Wang ◽

John M. Prausnitz

Keyword(s):

Ionic Liquid ◽

Lithium Ion Battery ◽

Lithium Ion ◽

Interfacial Properties ◽

Battery Separator

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Rational design of nonstoichiometric bioceramic scaffolds via digital light processing: tuning chemical composition and pore geometry evaluation

Journal of Biological Engineering ◽

10.1186/s13036-020-00252-3 ◽

2021 ◽

Vol 15 (1) ◽

Author(s):

Yifan Li ◽

Ronghuan Wu ◽

Li Yu ◽

Miaoda Shen ◽

Xiaoquan Ding ◽

...

Keyword(s):

Rational Design ◽

Bone Repair ◽

Pore Geometry ◽

Porous Structures ◽

Ion Release ◽

Digital Light Processing ◽

Cylindrical Pore ◽

Mechanical Strengths ◽

Ceramic Stereolithography ◽

Mg Doped

AbstractBioactive ceramics are promising candidates as 3D porous substrates for bone repair in bone regenerative medicine. However, they are often inefficient in clinical applications due to mismatching mechanical properties and compromised biological performances. Herein, the additional Sr dopant is hypothesized to readily adjust the mechanical and biodegradable properties of the dilute Mg-doped wollastonite bioceramic scaffolds with different pore geometries (cylindrical-, cubic-, gyroid-) by ceramic stereolithography. The results indicate that the compressive strength of Mg/Sr co-doped bioceramic scaffolds could be tuned simultaneously by the Sr dopant and pore geometry. The cylindrical-pore scaffolds exhibit strength decay with increasing Sr content, whereas the gyroid-pore scaffolds show increasing strength and Young’s modulus as the Sr concentration is increased from 0 to 5%. The ion release could also be adjusted by pore geometry in Tris buffer, and the high Sr content may trigger a faster scaffold bio-dissolution. These results demonstrate that the mechanical strengths of the bioceramic scaffolds can be controlled from the point at which their porous structures are designed. Moreover, scaffold bio-dissolution can be tuned by pore geometry and doping foreign ions. It is reasonable to consider the nonstoichiometric bioceramic scaffolds are promising for bone regeneration, especially when dealing with pathological bone defects.

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Ultrahigh capacity and cyclability of dual-phase TiO2 nanowires with low working potential at room and subzero temperatures

Journal of Materials Chemistry A ◽

10.1039/d0ta12112f ◽

2021 ◽

Author(s):

Dongmei Lin ◽

Linlong Lyu ◽

Kaikai Li ◽

Guohua Chen ◽

Haimin Yao ◽

...

Keyword(s):

Lithium Ion Battery ◽

High Voltage ◽

Lithium Ion ◽

Dual Phase ◽

Tio2 Nanowires ◽

Subzero Temperatures

The commercialization of TiO2 materials for lithium-ion battery (LIB) anodes has been seriously limited due to unsatisfactory capacities and high voltage plateaus vs Li/Li+ (~ 1.75 V). In this work,...

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