Very short functionalized carbon nanotubes for membrane applications

Fonseca, A.; Reijerkerk, SR Sander; Potreck, Jens; Nijmeijer, DC Kitty; Mekhalif, Zineb; Delhalle, Joseph

doi:10.1016/j.desal.2009.09.130

Cited by 18 publications

(9 citation statements)

References 9 publications

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“…Furthermore, initial studies reveal that short SWCNTs can be obtained after prolonged steam treatment [23]. Short CNTs have an increased biocompatibility and are desired for a wide range of applications including biomedicine [33,34], sensors [35], membranes [36] and electrode materials [37]. As such, a toolbox of cutting and shortening strategies is nowadays available including ball milling [38], lithography [39], fluorination [40] and oxidation [41].…”

Section: Introductionmentioning

confidence: 99%

The role of steam treatment on the structure, purity and length distribution of multi-walled carbon nanotubes

Cabana

Kepić

et al. 2015

Carbon

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Please cite this article as: Cabana, L., Ke, X., Kepić, D., Oro-Solé, J., Tobías-Rossell, E., Tendeloo, G.V., Tobias, G., The role of steam treatment on the structure, purity and length distribution of multi-walled carbon nanotubes, Carbon (2015), doi: http://dx. AbstractPurification and shortening of carbon nanotubes have attracted a great deal of attention to increase the biocompatibility and performance of the material in several applications.Steam treatment has been employed to afford both purification and shortening of multiwalled carbon nanotubes (MWCNTs). Steam removes the amorphous carbon and the graphitic particles that sheath catalytic nanoparticles, facilitating their removal by a subsequent acidic wash. The amount of metal impurities can be reduced in this manner below 0.01 wt.%. The length distribution of MWCNTs after different steam treatment times (from 1 h to 15 h) was assessed by box plot analysis of the electron microscopy data. Samples with a median length of 0.57 µm have been prepared with the reported methodology whilst preserving the integrity of the tubular wall structure.

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Section: Introductionmentioning

confidence: 99%

The role of steam treatment on the structure, purity and length distribution of multi-walled carbon nanotubes

Cabana

Kepić

et al. 2015

Carbon

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“…A strong improvement of permeability could be expected, if porous inorganic additives, e.g., zeolites, metal organic frameworks (MOFs) [ 66 , 67 , 68 , 69 , 70 , 71 , 72 ], carbon nanotubes (CNTs) [ 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 ] or porous layered oxides (PLOs) [ 82 , 83 , 84 , 85 , 86 , 87 , 88 ] with a pore diameter larger than the kinetic diameter of one gas component but smaller than the other one could be applied to the organic polymer.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cross-Linked and Additive Containing Polymer Materials for Membranes with Improved Performance in Pervaporation and Gas Separation

et al. 2012

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Pervaporation and gas separation performances of polymer membranes can be improved by crosslinking or addition of metal-organic frameworks (MOFs). Crosslinked copolyimide membranes show higher plasticization resistance and no significant loss in selectivity compared to non-crosslinked membranes when exposed to mixtures of CO2/CH4 or toluene/cyclohexane. Covalently crosslinked membranes reveal better separation performances than ionically crosslinked systems. Covalent interlacing with 3-hydroxypropyldimethylmaleimide as photocrosslinker can be investigated in situ in solution as well as in films, using transient UV/Vis and FTIR spectroscopy. The photocrosslinking yield can be determined from the FTIR-spectra. It is restricted by the stiﬀness of the copolyimide backbone, which inhibits the photoreaction due to spatial separation of the crosslinker side chains. Mixed-matrix membranes (MMMs) with MOFs as additives (fillers) have increased permeabilities and often also selectivities compared to the pure polymer. Incorporation of MOFs into polysulfone and Matrimid® polymers for MMMs gives defect-free membranes with performances similar to the best polymer membranes for gas mixtures, such as O2/N2 H2/CH4, CO2/CH4, H2/CO2, CH4/N2 and CO2/N2 (preferentially permeating gas is named first). The MOF porosity, its particle size and content in the MMM are factors to influence the permeability and the separation performance of the membranes.

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“…Previous detailed predictions and simulations have shown that the diffusivities of light gases inside the pores of CNTs is extremely rapid compared to other porous materials [2]. In light of this potential application, the utilization of CNTs/polymer nanocomposite in membrane based separation processes is growing rapidly and considerable efforts have been put in for the development in last decade [3][4][5][6]. In this so-called mixed matrix membrane (MMM), the CNT particles act as inorganic fillers to create preferential permeation pathways in order to improve separation performance in terms of the permeability of the gases [7,8].…”

Section: Introductionmentioning

confidence: 99%

Pre-treatment of multi-walled carbon nanotubes for polyetherimide mixed matrix hollow fiber membranes

Goh

Ismail

et al. 2012

Journal of Colloid and Interface Science

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Very short functionalized carbon nanotubes for membrane applications

Cited by 18 publications

References 9 publications

The role of steam treatment on the structure, purity and length distribution of multi-walled carbon nanotubes

The role of steam treatment on the structure, purity and length distribution of multi-walled carbon nanotubes

Investigation of Cross-Linked and Additive Containing Polymer Materials for Membranes with Improved Performance in Pervaporation and Gas Separation

Pre-treatment of multi-walled carbon nanotubes for polyetherimide mixed matrix hollow fiber membranes

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