Structural and Optical Characteristics of Silica Nanotubes Using CNTs as Template

Malekfar, Rasoul; Rajabi, Mohammad; Ara, Masato

doi:10.1007/bf03353853

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…FTIR of the annealed composites of various concentrations showed various absorption peaks and shoulders at wavenumbers between 500 and 1300 cm −1 , confirming the functionalization of the composites at various concentrations of SG occurred physically through annealing. Comparing the FTIR transmittance spectra of the composites before and after annealing (Figures 7 and 8, respectively), the presence of the multiple peaks and shoulders in the region of wavenumber between 500 to 1750 cm −1 confirms functionalizing MWCNTs [29,30].…”

Section: Ftir Measurementsmentioning

confidence: 89%

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Morphological: Optical, and Mechanical Characterizations of Non-Activated and Activated Nanocomposites of SG and MWCNTs

et al. 2021

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Nanocomposites of silica gel (SG) and multiwalled carbon nanotubes (MWCNTs) of relatively low concentrations (0.25, 0.50, and 0.75 wt%) were characterized before and after annealing. Adsorption is a surface phenomenon, and based on this, the morphology of the composites was investigated by scanning electron microscopy (SEM). The produced images show that the MWCNTs were embedded into the silica gel base material. Fourier transform infrared (FTIR) transmittance spectroscopy showed that MWCNTs were not functionalized within the matrix of silica gel and MWCNT composites. However, after annealing the composites at 400 °C for 4 h in air, evidence of activation was observed in the FTIR spectrum. The effects of the embedding of MWCNTs on porosity, specific surface area, and pore size distribution were studied using Raman spectroscopy. The Raman spectra of the prepared composites were mainly dominated by characteristic sharp scattering peaks of the silica gel at 480, 780, and 990 cm−1 and a broad band centered at 2100 cm−1. The scattering peaks of MWCNTs were not well pronounced, as the homogeneity of the composite is always questionable. Nanosizer analysis showed that at 0.25 wt%, the distribution of MWCNTs within the silica gel was optimal. Vickers hardness measurements showed that the hardness increased with the increasing weight percent of MWCNTs within the composite matrix, while annealing enhanced the mechanical properties of the composites. Further studies are required to investigate the pore structure of silica gel within the matrix of MWCNTs to be deployed for efficient cooling and water purification applications.

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Section: Ftir Measurementsmentioning

confidence: 89%

“…The peak positions were measured to 1 cm −1 accuracy. The acquisition time varied from a few seconds to a few minutes depending on the neutral density filters used [30].…”

Section: Raman Spectroscopymentioning

confidence: 99%

Morphological: Optical, and Mechanical Characterizations of Non-Activated and Activated Nanocomposites of SG and MWCNTs

et al. 2021

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“…Adding a small amount of graphite to energetic materials, such as explosives and propellants, can increase dispersion properties, prevent static electricity, change the burning rate, and reduce sensitivity [7,8]. Carbon nanotubes are functionalized or combined with other substances and then introduced into the energetic material system, which can improve ignition, energy release, and other properties of the agent [9][10][11][12]. Determination of the effective properties of CNT-reinforced composite is a highly complicated issue, for there are many factors that could affect the overall response.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Nanocarbon Materials on the Properties of Al/MoO3/NCM Thermite Prepared by Electrostatic Spinning

et al. 2022

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In order to improve thermal conductivity, energy performance, and combustion performance of the aluminum-containing thermite, nanocarbon materials were added to thermite. Aluminum/molybdenum and trioxide/nanocarbon materials (Al/MoO3/NCM) were fabricated by electrostatic spinning technology. The Al and MoO3 particles of the nAl/MoO3/NCM thermite are much smaller than nitrocellulose (NC); thus, the two components can be better attached to NC fibers. Results on thermal conductivity demonstrated that the addition of NCM can improve the thermal conductivity of Al/MoO3, and the addition of reduced graphene oxide (RGO) has a more significant impact on thermal conductivity. Energy performance analysis results indicated that the energy performance of Al/MoO3/NCM thermite spinning is the best when the value of combustion oxygen equivalent ratio (Φ) is 0.90–1.00. The combustion performance results show that the addition of NCM can significantly increase the combustion rate of thermites, and the addition of RGO improves its combustion rate the most, followed by carbon nanotubes (CNT) and nanoflake graphite (NFG) being the lowest. By changing the shape of the Al/MoO3/NCM charge and the internal composition of the charge, the sensitivity of the agent can be adjusted, and the matching performance and use performance of the electric igniter can be improved.

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“…A number of researchers have worked on this and as a result, a reasonable number of research articles on the topic appear in the literature. Among them, [ 1 , 2 ] considered a formation of CNT on functionalized graphene film grown by chemical vapor deposition [ 1 - 3 , 14 ]. They introduced an active terminal group containing SAM onto CVD graphene film which could be useful to uniformly bind CNTs onto the film surface and to encourage the fabrication of other nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

“…Among others, different methods such as liquid phase deposition and plasma- enhanced chemical vapor deposition with various catalytic recipes such as nickel, C 60 etc. have been successfully used [ 1 - 4 , 14 ]. In spite of these efforts, a simple, cheap and commercially deployable solution is yet to be achieved.…”

Section: Introductionmentioning

confidence: 99%

Novel Iron-oxide Catalyzed CNT Formation on Semiconductor Silicon Nanowire

Adam

Hashim

2014

CNANO

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An aqueous ferric nitrate nonahydrate (Fe(NO3)3.9H2O) and magnesium oxide (MgO) were mixed and deposited on silicon nanowires (SiNWs), the carbon nanotubes (CNTs) formed by the concentration of Fe3O4/MgO catalysts with the mole ratio set at 0.15:9.85 and 600°C had diameter between 15.23 to 90nm with high-density distribution of CNT while those with the mole ratio set at 0.45:9.55 and 730°C had diameter of 100 to 230nm. The UV/Vis/NIR and FT-IR spectroscopes clearly confirmed the presence of the silicon-CNTs hybrid structure. UV/Vis/NIR, FT-IR spectra and FESEM images confirmed the silicon-CNT structure exists with diameters ranging between 15-230nm. Thus, the study demonstrated cost effective method of silicon-CNT composite nanowire formation via Iron-oxide Catalyze synthesis.

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Structural and Optical Characteristics of Silica Nanotubes Using CNTs as Template

Cited by 7 publications

References 19 publications

Morphological: Optical, and Mechanical Characterizations of Non-Activated and Activated Nanocomposites of SG and MWCNTs

Morphological: Optical, and Mechanical Characterizations of Non-Activated and Activated Nanocomposites of SG and MWCNTs

Effects of Different Nanocarbon Materials on the Properties of Al/MoO3/NCM Thermite Prepared by Electrostatic Spinning

Novel Iron-oxide Catalyzed CNT Formation on Semiconductor Silicon Nanowire

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