Scalable electric-field-assisted fabrication of vertically aligned carbon nanotube membranes with flow enhancement

Castellano, Richard; Praino, Robert F.; Meshot, Eric R.; Chen, Chiatai; Fornasiero, Francesco; Shan, Jerry W.

doi:10.1016/j.carbon.2019.10.012

Cited by 23 publications

(13 citation statements)

References 75 publications

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“…[22] One common method utilizes dispersions of CNTs in polymer matrices and may include intermediate alignment steps to orient the nanotubes in the direction orthogonal to the membrane plane. [16,[23][24][25][26][27][28][29][30][31] This strategy offers the advantage of independent control over the CNT/polymer source and is amenable to continuous, large-scale fabrication techniques such as roll-to-roll manufacturing. Albeit a commercialization Figure 1.…”

Section: Doi: 101002/advs202001670mentioning

confidence: 99%

Ultra‐Permeable Single‐Walled Carbon Nanotube Membranes with Exceptional Performance at Scale

et al. 2020

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Enhanced fluid transport in single-walled carbon nanotubes (SWCNTs) promises to enable major advancements in many membrane applications, from efficient water purification to next-generation protective garments. Practical realization of these advancements is hampered by the challenges of fabricating large-area, defect-free membranes containing a high density of open, small diameter SWCNT pores. Here, large-scale (≈60 cm 2) nanocomposite membranes comprising of an ultrahigh density (1.89 × 10 12 tubes cm −2) of 1.7 nm SWCNTs as sole transport pathways are demonstrated. Complete opening of all conducting nanotubes in the composite enables unprecedented accuracy in quantifying the enhancement of pressure-driven transport for both gases (>290× Knudsen prediction) and liquids (6100× no-slip Hagen-Poiseuille prediction). Achieved water permeances (>200 L m −2 h −1 bar −1) greatly exceed those of state-of-the-art commercial nano-and ultrafiltration membranes of similar pore size. Fabricated membranes reject nanometer-sized molecules, permit fractionation of dyes from concentrated salt solutions, and exhibit excellent chemical resistance. Altogether, these SWCNT membranes offer new opportunities for energy-efficient nano-and ultrafiltration processes in chemically demanding environments. Carbon nanotubes (CNTs) have garnered sustained interest in many areas of material science due to their outstanding thermal, mechanical, electrical, and fluidic properties and have enabled advancements in a variety of functional materials and technologies. [1,2] In separation applications, CNTs are interesting membrane building blocks as their unique transport properties lead to exceptionally large flow rates compared to conventional porous materials with commensurate pore sizes.

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Section: Doi: 101002/advs202001670mentioning

confidence: 99%

Ultra‐Permeable Single‐Walled Carbon Nanotube Membranes with Exceptional Performance at Scale

et al. 2020

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“…In addition, a microtome was used to cut the bottom and top surfaces of VACNTs [ 17 , 18 ]. Plasma treatment is a well-known process used to uncap the ends of CNTs by oxidization of the surface of a VACNT membrane [ 71 , 73 , 75 , 80 , 88 ]. Strong acids, such as hydrogen fluoride (HF), can be used to oxidize the catalyst and fullerene cap without destroying the CNT structure [ 71 , 75 , 78 ].…”

Section: Fabrication Of the Vacnt Membranesmentioning

confidence: 99%

“…An electrically assisted post-alignment method was investigated by Castellano et al, which was implemented using an electrode chamber and solvent deposition by selective ultraviolet curable polyurethane ( Figure 11 c,d) [ 88 ]. Because the CNTs in a 1-cyclohexyl-2-pyrrolidinone (CHP) solution have a negative zeta-potential, they applied a combined AC and DC E-field to the solution so that CNTs were concentrated against the cathode.…”

Section: Future Outlookmentioning

confidence: 99%

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Vertically Aligned Carbon Nanotube Membranes: Water Purification and Beyond

et al. 2020

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Vertically aligned carbon nanotube (VACNT) membranes have attracted significant attention for water purification owing to their ultra-high water permeability and antibacterial properties. In this paper, we critically review the recent progresses in the synthesis of VACNT arrays and fabrication of VACNT membrane methods, with particular emphasis on improving water permeability and anti-biofouling properties. Furthermore, potential applications of VACNT membranes other than water purification (e.g., conductive membranes, electrodes in proton exchange membrane fuel cells, and solar electricity–water generators) have been introduced. Finally, future outlooks are provided to overcome the limitations of commercialization and desalination currently faced by VACNT membranes. This review will be useful to researchers in the broader scientific community as it discusses current and new trends regarding the development of VACNT membranes as well as their potential applications.

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“…2017; Castellano et al. 2015, 2020). The additional field-induced alignment energy will significantly affect the Brownian motion of an anisotropic particle.…”

Section: Introductionmentioning

confidence: 99%

Electric-field-controlled diffusion of anisotropic particles: theory and experiment

Yuan

Liu

et al. 2021

J. Fluid Mech.

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Scalable electric-field-assisted fabrication of vertically aligned carbon nanotube membranes with flow enhancement

Cited by 23 publications

References 75 publications

Ultra‐Permeable Single‐Walled Carbon Nanotube Membranes with Exceptional Performance at Scale

Ultra‐Permeable Single‐Walled Carbon Nanotube Membranes with Exceptional Performance at Scale

Vertically Aligned Carbon Nanotube Membranes: Water Purification and Beyond

Electric-field-controlled diffusion of anisotropic particles: theory and experiment

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