Functionalization of single-walled carbon nanotubes with N-[3-(trimethoxysilyl)propyl]ethylenediamine and its cobalt complex

Oki, Aderemi; Adams, Luqman A.; Luo, Zhipping; Edigin, Osayamen; Biney, P.O.; Khabashesku, Valéry N.

doi:10.1016/j.jpcs.2007.10.129

Cited by 11 publications

(6 citation statements)

References 14 publications

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“…For the chemical immobilization of Co 2+ ions in the silica gel matrix, the co-gelation of methyltrimethoxysilane (MTMS) and N-[3-(trimethoxysilyl)propyl]ethylenediamine (EDTMS) was used, where amino groups of EDTMS were expected to strongly bind cobalt ions [ 62 ] during their extraction from the cobalt-containing solutions [ 63 ]. To synthesize silica aerogels bearing ethylenediamine moieties, tetra alkoxysilanes are commonly used [ 58 , 64 , 65 , 66 ].…”

Section: Resultsmentioning

confidence: 99%

“…The differences in the FTIR spectra of the aerogels synthesized using EDTMS and the aerogel synthesized from pure MTMS are almost negligible. In the FTIR spectrum of the 15E aerogel, several extra-weak absorption bands are present in the range of 1400–1700 cm −1 , and the band at 1552 cm −1 can definitely be attributed to the N–H bond vibrations [ 62 ]. It should be borne in mind that, due to the low polarity of the ethylenediamine moieties, FTIR spectroscopy can provide little information on the composition of ethylenediamine-modified aerogels.…”

Section: Resultsmentioning

confidence: 99%

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Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica

et al. 2023

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The chemical immobilization of cobalt(II) ions in a silica aerogel matrix enabled the synthesis of the first representative example of aerogel-based single-ion magnets. For the synthesis of the lyogels, methyl-trimethoxysilane and N-3-(trimethoxysilyl)propyl ethylenediamine were co-hydrolyzed, then the ethylenediamine groups that were immobilized on the silica matrix enabled the subsequent binding of cobalt(II) ions. Lyogels with various amounts of ethylenediamine moieties (0.1–15 mol %) were soaked in isopropanol solutions of cobalt(II) nitrate and further supercritically dried in carbon dioxide to obtain aerogels with a specific surface area of 210–596 m2·g−1, an apparent density of 0.403–0.740 cm3·g−1 and a porosity of 60–78%. The actual cobalt content in the aerogels was 0.01–1.50 mmol per 1 g of SiO2, which could easily be tuned by the concentration of ethylenediamine moieties in the silica matrix. The introduction of cobalt(II) ions into the ethylenediamine-modified silica aerogel promoted the stability of the diamine moieties at the supercritical drying stage. The molecular prototype of the immobilized cobalt(II) complex, bearing one ethylenediamine ligand [Co(en)(MeCN)(NO3)2], was synthesized and structurally characterized. Using magnetometry in the DC mode, it was shown that cobalt(II)-modified silica aerogels exhibited slow magnetic relaxation in a nonzero field. A decrease in cobalt(II) concentration in aerogels from 1.5 mmol to 0.14 mmol per 1 g of SiO2 resulted in a weakening of inter-ion interactions; the magnetization reversal energy barrier likewise increased from 4 to 18 K.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica

et al. 2023

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“…Carbides and nitrides composites were also reported to show synergetic effect on the chemical stability and corrosion resistance of the samples, which results in better selectivity, catalytic capability and resistance to poisoning, as compare to their parents metal [20].…”

Section: Analysis Of Swcnt (11 8) Figure 3 X-rd Profile Of Swcntsmentioning

confidence: 99%

Selective Synthesis and Characterization of Single Walled Carbon Nanotubes (11, 8)

Zuru¹

2019

IJMSA

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Single walled carbon nanotubes (SWCNTs) are attractive in the nanotechnology industry where they find applications in the field of pharmacy and medicine due to high surface area capable of transporting drugs and vaccines to active sites; for fabrication of energy storing devices due to excellent electrical conductivity and accessible pore sizes; in transport for the fabrication of strong and lightweight vehicle and aircraft parts and in composite materials to enhance physical and chemical properties such as toughness, durability, conductivity and strength. The most efficient and cost effective method of obtaining these precious materials is the Chemical Vapour Deposition (CVD), however, obtaining SWCNTs of desired electronic type via this method, has remained a global challenge for over 20 years. This has limited the availability of these products in the global research and technological industries, contributing to the problem of lack of raw materials to sustain them. In this report, metallic SWCNTs (11, 8) are selectively synthesized via chemical vapor deposition (CVD) method, by the pyrolysis of C 6 H 14 /N 2 feedstock on Fe 2 O 3 /Al 2 O 3 catalyst matrix. Catalyst design and preparation was achieved by correlating the numerical magnitudes of chiral index (n, m) of the desired SWCNTs with mole fractions of metal/support, respectively. Field emission scanning electron microscopy analysis reveals densely entangled tubular bundles, while high resolution transmission electron microscopy confirms rigid arrangements of SWCNTs in the bundles. Values of the radial breathing modes, diameter and energy band gaps of the sample obtained from Raman analysis conforms to that of SWCNTs (11, 8), established via Extended Tight Binding (ETB) model. Outcome of this report suggested that our catalyst design and preparation may help alleviate the stated global challenge.

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“…However, commercial application of CNTs by the polymer industry has been limited so far because they are difficult to disperse in polymer matrices. Various methods of CNT chemical modification have been proved quite successful in introducing functional moieties that contribute to better nanotube dispersion, and eventually to efficient thermodynamic wetting of nanotubes with polymer matrices [9][10][11]. Modification methods of CNTs can be divided into two main categories based on the type of bonding to the nanotube surface.…”

Section: Introductionmentioning

confidence: 99%

Improved covalent functionalization of multi-walled carbon nanotubes using ascorbic acid for poly(amide–imide) composites having dopamine linkages

Mallakpour

Zadehnazari

2017

Bull Mater Sci

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Ascorbic acid has been covalently linked to multi-walled carbon nanotubes (MWCNTs). The structures of the functionalized MWCNTs were characterized with Fourier-transform infrared spectroscopy. Thermogravimetric analysis results also demonstrated the presence of organic portions of the functionalized MWCNTs. Polymer composites based on a nanostructured poly(amide-imide) (PAI) were fabricated by an ex situ technique with 5, 10 and 15% loading by weight. Composite films were made by the solvent casting method. The thermal stability of the composites increased with even a small amount of modified MWCNT added. Tensile tests were conducted and depicted an increase in the elastic modulus with increasing MWCNTs content. X-ray diffraction study of the composites also indicated that the composites incorporated MWCNTs in the polymer chain. Keywords. Multi-walled carbon nanotube; ascorbic acid; mechanical properties; thermal stability; transmission electron microscopy.

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Functionalization of single-walled carbon nanotubes with N-[3-(trimethoxysilyl)propyl]ethylenediamine and its cobalt complex

Cited by 11 publications

References 14 publications

Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica

Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica

Selective Synthesis and Characterization of Single Walled Carbon Nanotubes (11, 8)

Improved covalent functionalization of multi-walled carbon nanotubes using ascorbic acid for poly(amide–imide) composites having dopamine linkages

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