Surface characterisation of template-synthesised multi-walled carbon nanotubes

Babaa, M.R.; McRae, E.; Delpeux, Sandrine; Ghanbaja, Jaâfar; Valsaque, Fabrice; Béguin, F.

doi:10.1016/j.cplett.2004.07.070

Cited by 6 publications

(3 citation statements)

References 14 publications

(19 reference statements)

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“…The isotherms for these two samples showed some steps (type VI form the IUPAC classification). Each step corresponded to the formation of a Kr monolayer and these steps were characteristic of the adsorption on a fraction of uniform, homogeneous surface in agreement with the poorly-defected structure of rMWCNT and pMWCNT 27,28 . The isotherm of the functionalized MWCNTs showed a very different shape with i) disappearance of the steps indicating that the adsorption process occurred on less homogeneous surfaces and ii) larger gas quantities adsorbed, which was probably due to the damaging of the MWCNT walls by functionalization.…”

Section: Figuresupporting

confidence: 62%

Non-covalent and covalent immobilization of Candida antarctica lipase B on chemically modified multiwalled carbon nanotubes for a green acylation process in supercritical CO2

et al. 2020

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Candida antarctica B lipase (CAL-B) was immobilized on purified and functionalized multiwalled carbon nanotubes (MWCNTs). Both immobilization routes, physical adsorption and covalent bonding, were investigated. MWCNT functionalization by a non-aggressive oxidation by potassium permanganate led to an interesting balance between the hydrophilic and the hydrophobic areas of the MWCNT surface; the former being responsible of the good dispersion of MWCNTs in water and the latter having a favorable affinity with CAL-B. The enzyme loadings reached were significant: around 16 wt. % and 21 wt.% for non-covalent and covalent immobilization, respectively. The enzymatic activity was studied with the reaction of O-acylation of geraniol into geranyl acetate by CAL-B in supercritical CO2. Even if a decay in synthesis of geranyl acetate was observed over cycling for both CAL-B@MWCNT catalysts, it was demonstrated that the regioselectivity of CAL-B was unchanged through immobilization on the MWCNT surface for both routes. Interestingly, it was shown that a fully green enzymatic process can be achieved with these prepared CAL-B@MWCNT biocatalyst. Such approach could be transferred to other support/enzyme systems for developing new eco-friendly synthesis processes.

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Section: Figuresupporting

confidence: 62%

Non-covalent and covalent immobilization of Candida antarctica lipase B on chemically modified multiwalled carbon nanotubes for a green acylation process in supercritical CO2

et al. 2020

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“…Beguin et al [136,137] first investigated the effect of heat treatment on the structure of AAOCNTs. They reported that the crystalline structure of the AAO-CNTs could be improved by annealing at elevated temperatures between 1600 and 2400C under argon atmosphere.…”

Section: Poor Crystallinity Of Aao-cntsmentioning

confidence: 99%

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

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One of the most unique structural characteristics of carbon nanotubes (CNTs) differentiating from other carbon materials is their hollow nanochannles, which can be utilized for encapsulating and loading foreign matters. The anodic aluminum oxide (AAO) template technique enables the diameter, length, and cap structure control of the replicated CNTs, and thus shows advantages in pore structure control over the traditional CNT growth approaches. This review details the synthesis of CNTs with tunable diameter, length, wall thickness, and crystalline by using the AAO template method. The doping of heteroatoms and filling of foreign matters into AAO-CNTs are also addressed. Moreover, the main challenges and developing trends of the AAO template method are discussed.carbon nanotubes (CNTs), anodic aluminum oxide (AAO) template method, controllability Citation:Hou P X, Liu C, Shi C, et al. Carbon nanotubes prepared by anodic aluminum oxide template method.

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“…Another origin of this difference could be that the acidic treatment used to purify the sample significantly damaged the surface of the nanotubes. A previous study showed that this would result in a smoothing of the adsorption step [14].…”

Section: Quantitative Analysis Of the Isothermsmentioning

confidence: 99%

Qualitative assessment of the purity of multi-walled carbon nanotube samples using krypton adsorption

Gommes

Noville

Bossuot

et al. 2007

Studies in Surface Science and Catalysis

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Krypton is a subcritical vapour at the nitrogen boiling temperature. As such, its adsorption on crystalline surfaces leads to condensation steps, typical of type VI isotherms according to IUPAC, while its adsorption on rough surfaces is BET-like. Based on this property of krypton adsorption at 77 K, a methodology is proposed to determine the purity of carbon nanotubes samples. The method is tested on model samples obtained by mixing mechanically purified multi-walled carbon nanotubes with various amounts of the same catalyst as used for their synthesis.

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Surface characterisation of template-synthesised multi-walled carbon nanotubes

Cited by 6 publications

References 14 publications

Non-covalent and covalent immobilization of Candida antarctica lipase B on chemically modified multiwalled carbon nanotubes for a green acylation process in supercritical CO2

Non-covalent and covalent immobilization of Candida antarctica lipase B on chemically modified multiwalled carbon nanotubes for a green acylation process in supercritical CO2

Carbon nanotubes prepared by anodic aluminum oxide template method

Qualitative assessment of the purity of multi-walled carbon nanotube samples using krypton adsorption

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