Design of gradient nanopores in phenolics for ultrafast water permeation

Guo, Leiming; Yang, Yazhi; Xu, Fang; Lan, Qianqian; Wei, Mingjie; Wang, Yong

doi:10.1039/c8sc03012j

Cited by 22 publications

(26 citation statements)

References 39 publications

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“…It is noteworthy that poloxamers with shorter PEO chains possess stronger gelation capability [27]. As in the case of the PEO chains of P123 (20 repeat units per PEO block) were shortened compared to F127 (106 repeat units per PEO block), the gelation ability of F127 should be weaker than that of P123.…”

Section: Separation Performances Of Phenolic Membranesmentioning

confidence: 98%

“…As the surfaces of the phenolic membranes always consisted of tiny nanoparticles with diameters < 10 nm, it is difficult to reliably distinguish the nanoparticle sizes on the top of each membrane by the microscopic methods that can be applied here. However, since the uppermost layers of the phenolic membranes were formed by fast F127 gelation and thermopolymerization [27], the nucleation and growth of phenolic nanoparticles at the top surfaces of the phenolic membranes likely occurs in a similar manner for all investigated configurations. The discrepancies of the separation selectivities of the different phenolic 12 membranes likely arises from minute differences in the nanoparticles sizes at the top surfaces of the phenolic membranes.…”

Section: Evaluation Of Structural Gradients Of Phenolic Membranesmentioning

confidence: 99%

“…Previously, we combined resol and ZnCl2 with Pluronic P123 to design porous phenolic membranes with gradient nanostructures [27]. To reveal the impacts of poloxamers with different lengths of PEO chains on the structures and permselectivity of the phenolic membranes, in this work, we replaced P123 with F127 in the membrane-forming formulations.…”

Section: Gradient Nanoporous Phenolic Membranesmentioning

confidence: 99%

“…For the molar ratio of F127 to phenol was 0.007, dbottom decreased to ≈124 nm (Figure 4b), while the surface porosity was determined to be 29.4%. However, the increased dosages of F127 would inevitably induce the faster gelation and causes the reduction of the particle size [27]. For instance, the phenolic particle sizes were decreased to ≈85 and ≈35 nm at the bottoms of the membranes prepared at molar ratios of F127: phenol =0.012 and 0.016, respectively (Figure 4c…”

Section: Impact Of F127 Dosages On Structural Gradients Of Phenolic Mmentioning

confidence: 99%

“…In our previous work, the gradient nanoporous phenolic membranes have been prepared by assembling resol oligomers, Pluronic P123 and ZnCl2 [27]. During membrane-forming process, Pluronic P123 provided the gelation environment to control the nucleation of resol oligomers while ZnCl2 was used to accelerate the thermopolymerization of resol oligomers and stabilize the system.…”

Section: Introductionmentioning

confidence: 99%

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Tailored pore gradient in phenolic membranes for adjustable permselectivity by leveraging different poloxamers

Guo

Steinhart

Yang

et al. 2020

Separation and Purification Technology

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Cost-affordable phenolic membranes having gradient nanostructures can be facilely synthesized from resol oligomers in the presence of ZnCl2 and poloxamers. The gradient nanostructures are formed by stacking phenolic nanoparticles with gradually enlarged diameters as the distance from the upper surface increases. The use of poloxamers for creating gelation surroundings is of great significance for controlling the growth of phenolic nanoparticles, which in turn dictates the performance of the phenolic membranes thus-produced. Hence, a study of the effects of poloxamers species on the preparation of the phenolic membranes is highly demanded since such robust membranes have much potential to be scale up for mass production. Herein, the poloxamer Pluronic F127 (EO106-PO70-EO106; EO = ethyleneoxide, PO = propyleneoxide) was introduced in the membrane-forming formulations. As opposed to P123 (EO20-PO70-EO20) that we used previously, F127 possessing extended PEO chains can delay the gelation during membrane formation. Hence, the phenolic nucleates are able to grow for longer durations, leading to the generation of more distinct gradient nanostructures in the phenolic membranes.Enhanced permeance can then be realized with F127-derived phenolic membranes. We also demonstrate that L31 (EO1-PO22-EO1) with merely single terminal EO units at the ends of the PPO block could be used to prepare gradient phenolic membranes. This work is not only much helpful to deeply understand the design of the structural gradient in phenolic membranes, but capable of sheding light on the development of such intriguing structures for water purification.

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Section: Separation Performances Of Phenolic Membranesmentioning

confidence: 98%

Section: Evaluation Of Structural Gradients Of Phenolic Membranesmentioning

confidence: 99%

Section: Gradient Nanoporous Phenolic Membranesmentioning

confidence: 99%

Section: Impact Of F127 Dosages On Structural Gradients Of Phenolic Mmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Tailored pore gradient in phenolic membranes for adjustable permselectivity by leveraging different poloxamers

Guo

Steinhart

Yang

et al. 2020

Separation and Purification Technology

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Photo‐Induced Geometry and Polarity Gradients in Covalent Organic Frameworks Enabling Fast and Durable Molecular Separations

Yin,

Liu,

Zhang

et al. 2024

Small

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Azobenzene, which activates its geometric and chemical structure under light stimulation enables noninvasive control of mass transport in many processes including membrane separations. However, producing azobenzene‐decorated channels that have precise size tunability and favorable pore wall chemistry allowing fast and durable permeation to solvent molecules, remains a great challenge. Herein, an advanced membrane that comprises geometry and polarity gradients within covalent organic framework (COF) nanochannels utilizing photoisomerization of azobenzene groups is reported. Such functional variations afford reduced interfacial transfer resistance and enhanced solvent‐philic pore channels, thus creating a fast solvent transport pathway without compromising selectivity. Moreover, the membrane sets up a densely covered defense layer to prevent foulant adhesion and the accumulation of cake layer, contributing to enhanced antifouling resistance to organic foulants, and a high recovery rate of solvent permeance. More importantly, the solvent permeance displays a negligible decline throughout the long‐term filtration for over 40 days. This work reports the geometry and polarity gradients in COF channels induced by the conformation change of branched azobenzene groups and demonstrates the strong capability of this conformation change in realizing fast and durable molecular separations.

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Preparation and Performance of Novel Flavonoid Phenols-Based Biomass-Modified Phenol Formaldehyde Resins

Quan

Meng

et al. 2023

J Inorg Organomet Polym

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Low toxicity, environmentally friendly and sustainable bio-based phenol-formaldehyde (PF) resins are the primary factors and health goals that researchers need to consider when modifying PF resins. Two novel biomass-modi ed PF resins were synthesized using two avonoid phenols of daidzein and naringenin with rigid backbone structures. The results show that compared with ordinary PF, the introduction of daidzein and naringenin during the synthesis of N-PF and D-PF can delay the curing reaction and results in higher curing peak temperatures. The appropriate substitution rate of daidzein and naringenin can improve the crosslinking degree, resulting in N-PF and D-PF with higher thermal stability, ablation resistance and mechanical properties. The highest carbon yield YC800 for N-PF is 59.81% (56.85%for PF-1), and the highest YC800 for D-PF is 64.39% (PF-2 with 58.15%). The maximum tensile strength and exural strengths of N-PF are respective 33.86 MPa and 110.42 MPa (28.77 and 79.89 MPa for PF-1), and the maximum tensile strength and exural strengths of D-PF are respective 35.61 MPa and 103.17 MPa (24.48 and 55.79 MPa for PF-2). The D-PF and N-PF resins modi ed and enhanced by daidzein and naringenin have lower friction coe cient and more excellent wear resistance than pure PF.

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Design of gradient nanopores in phenolics for ultrafast water permeation

Abstract: Ultra-permeable and robust membranes are prepared by creating a gradient nanoporous structure in low-cost phenolics, enabled by the spontaneous assembly of gradually enlarged phenolic nanoparticles.

Cited by 22 publications

References 39 publications

Tailored pore gradient in phenolic membranes for adjustable permselectivity by leveraging different poloxamers

Tailored pore gradient in phenolic membranes for adjustable permselectivity by leveraging different poloxamers

Photo‐Induced Geometry and Polarity Gradients in Covalent Organic Frameworks Enabling Fast and Durable Molecular Separations

Preparation and Performance of Novel Flavonoid Phenols-Based Biomass-Modified Phenol Formaldehyde Resins

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