1,720,995 research outputs found
Raman spectroscopy is a convenient technique for the efficient evaluation of cyclodextrins inclusion molecular complexes of azo-dye colorants and largely polarisable guest molecules
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Efficient direct water-solubilisation of single-walled carbon nanotube derivatives
No full textApplication under mild conditions of a one-pot reductive–oxidative synthetic protocol to single-walled carbon nanotubes (SWNT) affords water-soluble oxygenated products that have been characterised by mean of XPS, solution 1H-NMR, UV-VIS-NIR, vibrational FTIR and Raman, SEM–energy dispersive x-ray (EDX), XRD, and ESI-MS techniques. Different oxygenated functionalities are evicted to be covalentlybonded to carbon nanotubes frameworks, due to electrophilic insertion of O2 upon reduced carbon structures. The pH-dependent behaviour in water solution and the observed partial fragmentation of oxidised nanotubes, that can contribute in enhancing water solubility by shortening structures, are discussed. Prolonged heating of the material affords a higher graphitisation index of the functionalised carbonaceous water- soluble frameworks, and possible chemical paths for the partial recovering of pristine carbon nanostructures are reported. The achieved hydrophily due to polar oxygen moieties insertions on nanostructures provides a remarkable unprecedented water solubility for these carbon substrates without the attachment of large polar appendages
The reactions of two new alkoxy-silyl functionalized alkynes with M3(CO)12 (M=Fe,Ru) and Co2(CO)8. Spectroscopic identification of the products
No full textA study on the carbon soot derived from the wood combustion and on the relative alkali-extractable fraction
No full textIn this experimental study, waste particulate of domestic flame combustion of wooden matters have been reacted according to a direct mild-condition reductive-oxidative chemical synthesis. Water-soluble graphenic and polycyclic aromatic frameworks have been extracted from graphitized carbon residues. Products have been recovered by elemental carbon contented in both fly and bottom combustion particu- late. Their pH-sensitive behavior in aqueous solutions has been elucidated. Products and reactant substrates have been spectroscopically characterized by mean of solid state vibrational FT-IR and Raman, UV-VIS, XRD, solution 1H and 13C NMR, SEM-EDX and MALDI-TOF MS techniques. Discussion upon the reactivity of flame carbon residues of wooden matters is reported, in comparison to the reactivity displayed by other graphenic structures, according to the reported synthetic protocol
Hydrosolubilization of large aromatic molecules: facile synthesis and chararcterization of water-soluble derivatives of decacyclene.
No full textCorrelations among hydrogen bonding configuration, structural order and optical coefficients in hydrogenated amorphous germanium obtained by X-ray-acitvated chemical vapour deposition
No full textSynthesis and spectral characterization of water-soluble derivatives of C70 and high-order fullerene mixture (C76, C78 and C84) achieved by chemically induced air oxidation.
No full textSpectral and chemical evidence for the direct formation of carboxylic groups in aerobically oxidised water-soluble fullerenes
No full textThe synthesis of oxidised water-soluble fullerenes, prepared by chemically-induced aerobic oxidation, yields functionalised carbon cluster structures, which are oxidised by the covalent insertion of different oxygen units. Their strictly pH-dependent behaviour in aque- ous solutions appears to be properly ascribed to the existence of directly attached carboxylic moieties. The presence of these groups, which are usually neglected and underestimated, has been thoroughly investigated. Several concurrent spectral (UV–VIS, XPS, solid- state 13C CPMAS NMR, FT-IR, Raman, EDAX, TGA-MS, ESI-MS) and chemical (acid–base behaviour, salt precipitation by metal-complexation, carboxylic functionalisation) methods have provided a definitive set of consistent evidence, indicating for the first time the direct linkage of carboxylic groups on water-soluble fullerenes prepared in this manner
A fast effective route to pH-dependent water-dispersion of oxidized single-walled carbon nanotubes
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