Hierarchical Pore Structures and High ZIF-8 Loading on Matrimid Electrospun Fibers by Additive Removal from a Blended Polymer Precursor

Armstrong, Mitchell R.; Shan, Bohan; Maringanti, Sai Vivek; Zheng, Weihua; Mu, Bin

doi:10.1021/acs.iecr.6b02479

Cited by 22 publications

(27 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Electrospun fibers were fabricated using an apparatus described previously . 1:1:0.25 MAT:PEO:ZIF‐8 and 1:1:2 MAT:PEO:ZIF‐8 were prepared in a previous study by the same manner and more details and characterization are shown there …”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Core–shell adsorbents by electrospun MOF‐polymer composites with improved adsorption properties: Theory and experiments

et al. 2019

Self Cite

View full text Add to dashboard Cite

A new class of core-shell adsorbents has been created by electrospun metal-organic framework (MOF) particles embedded in polymer nanofibers, which have provided many unique properties compared to the existing MOF coating technologies. For the first time, we demonstrate the improved adsorption selectivity of CO 2 over N 2 using electrospun polymer/ZIF-8 adsorbents in experiments. Furthermore, an analytical model based on the assumption that the diffusivity in core is 10 times higher than that in shell is developed to describe the theory of improved selectivity for core-shell adsorbents that is validated against a more accurate finite element model developed in COMSOL. Our model shows three regimes including exclusive shell uptake, linear core uptake, and asymptotic core uptake. These regimes are related to material properties and uptake times, which could be used as design criteria to balance core stability, maximum selectivity, and maximum uptake. An advanced HAADF STEM tomography (Movie S1) shows that the shell thickness in the case of polymer/ZIF-8 is on the order of 10 nm, allowing the regime of maximum selectivity to be realized. Kinetically limited adsorption tests at 45 C demonstrate that these composite fibers can perform in a regime of selectivity and uptake for the separation of CO 2 and N 2 that is unobtainable by either the MOF or fiber independently, showing a great potential for postcombustion CO 2 capture.

show abstract

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Core–shell adsorbents by electrospun MOF‐polymer composites with improved adsorption properties: Theory and experiments

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…To form porous electrospun fiber scaffolds for the crushed IER, a SPAR technique developed by our group is used . A solution containing 400 mg crushed resin is suspended in a 10 mL dimethylformamide solution containing a 400 mg polystyrene and 400 mg poly(ethylene oxide) (MV = 400,000, Sigma‐Aldrich) blend.…”

Section: Methodsmentioning

confidence: 99%

“…One shortcoming of dense electrospun fibers are the fact that many of the particles become buried in the polymer phase and inaccessible to the fluid stream causing a lower sorption capacity . To overcome this hurdle, we have developed a solvothermal polymeric additive removal (SPAR) technique that creates porous electrospun fibers to remedy this issue . This design strategy has already been replicated by Qin and coworkers for antibiotic removal in which it was demonstrated that immobilizing a catalyst in porous fiber that nears the performance of freestanding catalyst with the benefit of immobilization and reusability …”

Section: Introductionmentioning

confidence: 99%

Rapid CO₂ capture from ambient air by sorbent‐containing porous electrospun fibers made with the solvothermal polymer additive removal technique

et al. 2018

Self Cite

View full text Add to dashboard Cite

Direct air capture (DAC) of CO 2 is an emerging technology in the battle against climate change. Many sorbent materials and different technologies such as moisture swing sorption have been explored for this application. However, developing efficient scaffolds to adopt promising sorbents with fast kinetics is challenging, and very limited effort has been reported to address this critical issue. In this work, the availability and kinetic uptake of CO 2 in sorbents embedded in various matrices are studied. Three scaffolds including a commercially available industrial film containing ion-exchange resin (IER), IER particles embedded in dense electrospun fibers, and IER particles embedded in porous electrospun fibers are compared, in which a solvothermal polymer additive removal technique is used to create porosity in porous fibers. A frequency response technique is developed to measure the uptake capacity, sorbent availability, and kinetic uptake rate. The porous fiber has 90% IER availability, while the dense fibers have 50% particle accessibility. The sorption half time for both electrospun fiber samples is 10 AE 3 min. Our experimental results demonstrate that electrospinning polymer/sorbent composites is a promising technology to facilitate the handleability of sorbent particles and to improve the sorption kinetics, in which the IER embedded in porous electrospun fibers shows the highest cycle capacity with an uptake rate of 1.4 mol CO 2 per gramhour.

show abstract

“…This route can overcome some of the drawbacks of the direct electrospinning route discussed in Section 2.1, such as poor dispersion of MOF particles in the polymers, blockage of MOF pores, or reduced mechanical properties, such as high brittleness due to MOF loading. [71] Copyright 2017, American Chemical Society. For this purpose, a variety of processing methods or their Adv.…”

Section: Surface Decoration Of Polymer Nanofibers With Mofsmentioning

confidence: 99%

Section: Routes For the Structuring Of Mof Nanofiber Architecturesmentioning

confidence: 99%

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

2019

View full text Add to dashboard Cite

organic linkers with a periodic, nanoscaled structure and ultrahigh surface areas. With their tunable pore/cage sizes, flexible skeleton, and large surface-to-volume ratio, [13][14][15][16][17][18][19] MOFs have a large potential for a wide range of applications, including gas storage and separation, rechargeable batteries, supercapacitors, solar cells, nanoreactors, heterogeneous catalysis, or drug delivery. [20][21][22][23][24][25][26][27] Recently, significant efforts have been devoted to the design and synthesis of new MOFs structures and the investigation of their physical or chemical properties. MOFs are generally prepared as bulk form through traditional hydrothermal or solvothermal synthesis. [28][29][30][31] In order to expand the application range, suitable pathways for the structuring of MOF powders into a functional architecture or devices are highly desirable.Currently, intensive efforts are focusing on the structuring of MOFs at the mesoscopic/macroscopic scale for the use as coatings, membranes, or sophisticated architectures in specific devices and applications. [32][33][34][35] A major difference in the structuring of MOFs into complex shapes compared to inorganic microporous materials, such as zeolites or silica, is the fact that most inorganic binders cannot be used for MOFs as these binders usually require heat treatment. The intrinsic fragility of MOFs needs to be considered which is related to the inorganic/organic hybrid character of this class of materials and the resulting limited thermal and mechanical stability. Alternatively, a more effective way to structure MOFs is the combination with polymer materials. The polymer which acts as a binder improves the mechanical flexibility and ensures chemical stability. Numerous methods have been developed for structuring MOF-polymer compositions including hard or soft templates, spin-or dip-coating, spray-drying, printing, or lithography approaches. [36][37][38] The integration of MOFs into a polymer matrix can result in poor MOF-polymer dispersion and compatibility issues owing to the different physical and chemical properties for the two kinds of materials and this is a challenge in some applications, e.g., in MOF-based mixed matrix membranes for gas separation. [39][40][41][42] The poor interfacial compatibility would lead to agglomeration of MOF particles, causing the formation of nonselective voids between the MOFs particles and the polymer.Electrospinning is a fabrication method to produce continuous ultrafine fibers with diameters in the range of a few tens of nanometers to a few micrometers in the form of nonwoven mats, yarns, etc. The mechanism of electrospinning is based Herein, recent developments of metal-organic frameworks (MOFs) structured into nanofibers by electrospinning are summarized, including the fabrication, post-treatment via pyrolysis, properties, and use of the resulting MOF nanofiber architectures. The fabrication and post-treatment of the MOF nanofiber architectures are described systematically by two routes: i) the dire...

show abstract

Hierarchical Pore Structures and High ZIF-8 Loading on Matrimid Electrospun Fibers by Additive Removal from a Blended Polymer Precursor

Cited by 22 publications

References 29 publications

Core–shell adsorbents by electrospun MOF‐polymer composites with improved adsorption properties: Theory and experiments

Core–shell adsorbents by electrospun MOF‐polymer composites with improved adsorption properties: Theory and experiments

Rapid CO₂ capture from ambient air by sorbent‐containing porous electrospun fibers made with the solvothermal polymer additive removal technique

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

Contact Info

Product

Resources

About

Hierarchical Pore Structures and High ZIF-8 Loading on Matrimid Electrospun Fibers by Additive Removal from a Blended Polymer Precursor

Cited by 22 publications

References 29 publications

Core–shell adsorbents by electrospun MOF‐polymer composites with improved adsorption properties: Theory and experiments

Core–shell adsorbents by electrospun MOF‐polymer composites with improved adsorption properties: Theory and experiments

Rapid CO2 capture from ambient air by sorbent‐containing porous electrospun fibers made with the solvothermal polymer additive removal technique

Electrospinning of Metal–Organic Frameworks for Energy and Environmental Applications

Contact Info

Product

Resources

About

Rapid CO₂ capture from ambient air by sorbent‐containing porous electrospun fibers made with the solvothermal polymer additive removal technique