Fabrication of SWNT/Silica Composites by the Sol−Gel Process

Babooram, Keshwaree; Narain, Ravin

doi:10.1021/am8001296

Cited by 30 publications

(13 citation statements)

References 18 publications

(20 reference statements)

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“…At higher magnification, the TEM image shows acrylic ionomers attached to the SWCNT sidewalls and that each nanotube is sheathed by regions of ionomer, presumably corresponding to the poly (acrylate) 4 Zr. In Figures a–c, (see arrows), large nanotube bundles of 2 are separated into individual tubes due to ionomer functionalization, possibly as a result of steric repulsion between ionomeric groups . Formation of a large network of nanotubes that are interconnected by Zr cations, chelated by carboxylate groups which ionically crosslink the ionomer chains is also possible …”

Section: Resultsmentioning

confidence: 99%

“…Similar to the effects observed in DSC, an upward shift of 13°C in the decomposition temperature was observed for 2, compared to 3 in TGA (Figures b vs. c). In addition, the higher thermal stability of 2 at 429.8°C relative to 3, gives evidence for covalent attachment of the ionomer to SWCNTs . This may be due to the more labile nature of acrylic ionomer bonds, which results in lower decomposition temperatures ( T d ), whereas the covalent bonding to SWCNTs in 2 leads to a higher T d .…”

Section: Resultsmentioning

confidence: 99%

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Ionomer covalent functionalization of single‐walled carbon nanotubes by radical polymerization of zirconium acrylate

Jaisankar¹,

Nelson²,

Kumar³

et al. 2014

AIChE Journal

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A facile and efficient covalent functionalization of single-walled carbon nanotubes (SWCNTs) via peroxide-mediated free radical covalent attachment and polymerization of zirconium acrylate is reported. The resulting covalently functionalized SWCNTs exhibit improved solubility in organic solvents. The covalently functionalized SWCNTs are characterized by cross polarization magic angle spinning 13 C NMR, differential scanning calorimetry, thermogravimetric analysis, x-ray diffraction, Raman, and infrared spectroscopy. Infrared spectroscopy reveals that carboxylate groups of covalently attached ionomers chelate with zirconium ions and the participating carboxylate groups may be from different ionomer chains leading to cross-linking the chains. The SWCNT topology, ionic clustering, and p-electron clouds were explored by transmission electron microscopy. V C 2014 American Institute of Chemical Engineers AIChE J, 60: [820][821][822][823][824][825][826][827][828] 2014

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ionomer covalent functionalization of single‐walled carbon nanotubes by radical polymerization of zirconium acrylate

Jaisankar¹,

Nelson²,

Kumar³

et al. 2014

AIChE Journal

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“…Silica and organosilica microparticles doped with organic molecules are innovative functional materials with promising applications in the encapsulation field . Silane coupling agents are also widely used to modify the surface properties of material through the sol‐gel process, such as carbon nanotubes . Silica particles made with the sol‐gel method differ significantly from other organic carriers because of their inert, stable chemical and physical structure, large surface area, and biocompatibility .…”

Section: Introductionmentioning

confidence: 99%

Lavender fragrance sol‐gel encapsulated in ORMOSIL nanospheres

Xiao

Liu

Zhu

et al. 2018

Flavour & Fragrance J

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Lavender fragrance (LF) was encapsulated successfully in ORMOSIL (organically modified silica) via the sol‐gel approach. Silane precursor‐ethylsilicate (TEOS) was modified with methyltrimethoxysilane (MTMS) to enhance the mechanical strength and compatibility of the wall material. Hexadecyl trimethyl ammonium bromide (CTAB) was added as surfactant and polymer for the formation of nanospheres. An encapsulation efficiency of 96.36% was achieved under optimal conditions (water/ethanol ratio of 2 : 1, with pH 9.5, and with a surfactant concentration of 25 mM). Moreover, a scanning electron microscope (SEM) image of the LF nanospheres showed that the nanospheres were spherical with good dispersibility. The Fourier transform infrared spectroscopy (FTIR) analysis indicated that LF was successfully encapsulated in organically modified silica. The result of thermogravimetric (TG) analysis showed that the nanospheres had excellent thermal stability. Furthermore, the SEM image of aromatic wallpaper indicated a successful application of the LF nanospheres in wallpaper.

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“…[1][2][3] Much of this interest stems from the fact that the resulting nanocomposite could offer desirable mechanical strength, 4 optical properties 5 and electrical conductivity. [1][2][3] Much of this interest stems from the fact that the resulting nanocomposite could offer desirable mechanical strength, 4 optical properties 5 and electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Construction and electronic properties of carbon nanotube hybrids with conjugated cubic silsesquioxane

Lin

et al. 2015

New J. Chem.

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We herein reprot a hierarchical hybrid preparaed from zero-dimensional cubic silsesquioxane, octa-aminophenylsilsesquioxane, and one-dimensional single-walled carbon nanotubes (SWNT) through Friedel-Crafts acylation and amidation chemistry.We characterized the electronic structure and morphology of the nanohybrid by FT-IR spectra, Raman spectra, electrochemical analysis and field-emission scanning electron microscope. In addition, High resolution TEM results indicated that their average diameter and diameter distribution remained nearly unchanged with respect to that of the pristine, in accordance with the Raman spectroscopic results. The specific 2 capacitance of abtained hybrid was larger than that of the pristine SWNT due to the hierarchical structure and the charge transfer from both SWNT and octa-aminophenylsilsesquioxane. To further study the electronic properties of conjugated functionalized silsesquioxane, the model compounds with a structure similar to that of the nanohybrid were desighed and characterized by photoluminescence UV-vis analysis and density functional theoretical calculations.The analysis indicated the presence of an electron delocalization effect between the octa-aminophenylsilsesquioxane cores and the conjugated group. Such important electronic properties also assisted in the improvement of the performance for hierarchical hybrid.

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Fabrication of SWNT/Silica Composites by the Sol−Gel Process

Cited by 30 publications

References 18 publications

Ionomer covalent functionalization of single‐walled carbon nanotubes by radical polymerization of zirconium acrylate

Ionomer covalent functionalization of single‐walled carbon nanotubes by radical polymerization of zirconium acrylate

Lavender fragrance sol‐gel encapsulated in ORMOSIL nanospheres

Construction and electronic properties of carbon nanotube hybrids with conjugated cubic silsesquioxane

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