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Encapsulation of Fullerenes: A Versatile Approach for the Confinement and Release of Materials Within Open-Ended Multiwalled Carbon Nanotubes.

ABSTRACT: We have employed fullerenes as versatile agents to "cork" the open tips of multiwalled carbon nanotubes (MWCNTs), and as promoting species for the release of the inorganic material filled within the nanotubes' cavities. High Z element compounds, namely, PbI₂, ZnI₂, and CeI₃, were chosen to easily determine the presence of the filler inside the hosting nanotubes by transmission electron microscopy (TEM). Fullerenes can isolate inorganic nanostructures confined within the hollow cavities of MWCNTs, which allows the removal of the external material remnant after the filling. Otherwise, taking advantage of the affinity of fullerenes with selected solvents, we have confirmed the ability of the C₆₀ molecules to promote the displacement of the inorganic guest from the host. We propose two different strategies to trigger the release, employing vapor and liquid phase treatments. The first protocol involves annealing filled MWCNTs in presence of fullerenes (to obtain C₆₀PbI₂@MWCNTs) and the subsequent washing of the sample in ethanol under mild conditions. On the other hand, the simultaneous introduction of the C₆₀ molecules and the liberation of the guest are produced by a single step wet procedure; the latter being potentially useful when materials that are not stable at high temperatures are employed for filling.

SUBMITTER: Sandoval S

PROVIDER: S-EPMC7987908 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Creating covalent bonds between Cu and C at the interface of metal/open-ended carbon nanotubes.

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| S-EPMC8238539 | biostudies-literature

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2015-11-27 | GSE75429 | GEO

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Project description:Natural materials can provide cost-effective way in the development of various products for specific applications. On the hand, physicochemical properties of composite materials can be enhanced to perform a specific process of interest such as wastewater treatment. Clay materials have been used for many applications including brick making and wastewater treatment. To enhance the properties of natural materials such as clay, multiwalled carbon nanotubes (MWCNTs) were used to enhance the properties of natural clays. Natural clays and MWCNTs composites were characterized to provide insights as a starting point for various applications. There are two sets of data presented in this study: i) raw material, unheated and heated (at 900 °C); ii) natural clay, MWCNTs and natural clay/MWCNTs composites. The chemical composition and phase identification analyzes were carried out using X-ray Fluorescence (XRF) and X-Ray Diffraction (XRD), respectively. A Fourier-transform infrared (FTIR) spectrometer was used to determine the functional groups of the samples. The UV-vis analyzes were carried out to investigate the reflectance percentage of the natural clays and the composites samples. The Thermogravimetric analysis (TGA) analyzes were performed to investigate the weight loss and dehydration process of the samples. The presented data showed that natural clays and natural clays/MWCNTs composites can be used for various applications such as construction industry, for cosmetic usages and for the removal of pollutants in aqueous solutions.

| S-EPMC8661467 | biostudies-literature

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