Linear carbon chains encapsulated in multiwall carbon nanotubes: Resonance Raman spectroscopy and transmission electron microscopy studies

The adsorption mechanism of the removal of lead from water by using carboxylic functional group (COOH) functionalized on the surface of carbon nanotubes was investigated. Four independent variables including pH, CNTs dosage, contact time, and agitation speed were carried out to determine the influence of these parameters on the adsorption capacity of the lead from water. The morphology of the synthesized multiwall carbon nanotubes (MWCNTs) was characterized by using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) in order to measure the diameter and the length of the CNTs. The diameters of the carbon nanotubes were varied from 20 to 40 nm with average diameter at 24 nm and 10 micrometer in length. Results of the study showed that 100% of lead was removed by using COOH-MCNTs at pH 7, 150 rpm, and 2 hours. These high removal efficiencies were likely attributed to the strong affinity of lead to the physical and chemical properties of the CNTs. The adsorption isotherms plots were well fitted with experimental data.

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Experimental and theoretical studies on the mechanism for chemical oxidation of multiwalled carbon nanotubes

RSC Advances ◽

10.1039/c4ra03881a ◽

2014 ◽

Vol 4 (55) ◽

pp. 28826-28831 ◽

Cited By ~ 22

Author(s):

B. M. Maciejewska ◽

M. Jasiurkowska-Delaporte ◽

A. I. Vasylenko ◽

K. K. Kozioł ◽

S. Jurga

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Transmission Electron Microscopy ◽

Raman Spectroscopy ◽

Multiwalled Carbon Nanotubes ◽

Chemical Oxidation ◽

Theoretical Studies ◽

Multiwalled Carbon ◽

Transmission Electron ◽

Experimental And Theoretical Studies

In this study, the oxidation of multiwalled carbon nanotubes (MWCNTs) sonicated and/or refluxed in acids (H2SO4/HNO3) was investigated using a combination of high-resolution transmission electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and ab initio computational methods.

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Composite Nanofibers Containing Multiwall Carbon Nanotubes as Biodegradable Membranes in Reconstructive Medicine

Nanomaterials ◽

10.3390/nano9010063 ◽

2019 ◽

Vol 9 (1) ◽

pp. 63 ◽

Cited By ~ 2

Author(s):

Andrzej Hudecki ◽

Dorota Łyko-Morawska ◽

Wirginia Likus ◽

Magdalena Skonieczna ◽

Jarosław Markowski ◽

...

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Maxillofacial Surgery ◽

Multiwall Carbon Nanotubes ◽

Dermal Fibroblasts ◽

Hydroxyl Groups ◽

X Ray ◽

Biological Responses ◽

Transmission Electron ◽

Multiwall Carbon

We have tested titanium (Ti) plates that are used for bone reconstruction in maxillofacial surgery, in combination with five types of novel long-resorbable biomaterials: (i) PCL0—polycaprolactone without additives, (ii) PCLMWCNT—polycaprolactone with the addition of multiwall carbon nanotubes (MWCNT), (iii) PCLOH—polycaprolactone doped with multiwall carbon nanotubes (MWCNT) containing –OH hydroxyl groups, (iv) PCLCOOH—polycaprolactone with the addition of multiwall carbon nanotubes (MWCNT) containing carboxyl groups, and (v) PCLTI—polycaprolactone with the addition of Ti nanoparticles. The structure and properties of the obtained materials have been examined with the use of Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and/or X-ray powder diffraction (XRD). Titanium BR plates have been covered with: (i) PCL0 fibers (PCL0BR—connection plates), (ii) PCLMWCNT fibers (PCLMWCNTBR—plates), (iii) PCLOH fibers (PCLOHBR—plates), (iv) PCLCOOH (PCLCOOHBR—plates), (v) PCLTI fiber (PCLTIBR—connection plates). Such modified titanium plates were exposed to X-ray doses corresponding to those applied in head and neck tumor treatment. The potential leaching of toxic materials upon the irradiation of such modified titanium plates, and their effect on normal human dermal fibroblasts (NHDF) have been assessed by MTT assay. The presented results show variable biological responses depending on the modifications to titanium plates.

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Nano-Composite Materials Studied by CTEM and STEM

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.121-123.991 ◽

2007 ◽

Vol 121-123 ◽

pp. 991-994 ◽

Cited By ~ 1

Author(s):

Jian Bo Wang ◽

Lu Ying Li ◽

Zhe Liu ◽

Ren Hui Wang

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Composite Materials ◽

Scanning Transmission Electron Microscopy ◽

Multiwall Carbon Nanotubes ◽

Nano Composite ◽

Carbon Nanohorns ◽

Transmission Electron ◽

Scanning Transmission ◽

Multiwall Carbon

Various techniques in conventional transmission electron microscopy (CTEM) and scanning transmission electron microscopy (STEM) are applied to characterize comprehensively the microstructures of the nano-composite materials, including Cu2O quantum dots deposited on multiwall carbon nanotubes (CNTs) and Fe particles encapsulated in carbon nanohorns (CNHs) as two studying cases.

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Preparation of a Novel CO2-Responsive Polymer/Multiwall Carbon Nanotube Composite

Processes ◽

10.3390/pr9091638 ◽

2021 ◽

Vol 9 (9) ◽

pp. 1638

Author(s):

Yonggang Ma ◽

Xin Chen ◽

Dehui Han ◽

Zhe Zhao ◽

Wenting Lu

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Transmission Electron Microscopy ◽

Carbon Nanotube ◽

Multiwall Carbon Nanotube ◽

Nanotube Bundles ◽

Transmission Electron ◽

Responsive Polymer ◽

Carbon Nanotube Composite ◽

Multiwall Carbon

A CO2-responsive composite of multiwall carbon nanotube (MWCNT) coated with polydopamine (PDA) and polydimethylamino-ethyl methacrylate (PDMAEMA) was prepared. The PDA was first self-polymerized on the surface of carbon nanotube. 2-bromoisobutyryl bromide (BiBB) was then immobilized by PDA and then initiated the ATRP of DMAEMA on the carbon nanotube surface. The resulting composite was characterized by Fourier-transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The CO2-responsive test was performed by bubbling CO2 into the mixture of MWCNT-PDA-PDMAEMA composite in water. A well-dispersed solution was obtained and the UV-Vis transmittance decreased dramatically. This is attributed to the reaction between PDMAEMA and CO2. The formation of ammonium bicarbonates on the surface of carbon nanotubes leads to the separation of nanotube bundles. This process can be reversed as the removal of CO2 by bubbling N2.

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Effect of Urea on the Shape and Structure of Carbon Nanotubes

Zeitschrift für Naturforschung A ◽

10.1515/zna-2017-0288 ◽

2018 ◽

Vol 73 (2) ◽

pp. 113-120 ◽

Cited By ~ 1

Author(s):

M. R. Elamin ◽

Babiker Y. Abdulkhair ◽

Kamal K. Taha

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Chemical Vapour ◽

Multiwall Carbon Nanotubes ◽

Nitrogen Adsorption ◽

X Ray Diffraction ◽

Transmission Electron ◽

Adsorption Analysis ◽

Bet Analysis ◽

Multiwall Carbon

AbstractCoiled multiwall carbon nanotubes (MWCNTs) were prepared on Fe, Co, and Ni metal oxides supported on α-Al2O3 using urea as fuel and catalyst surface modifying agent by catalytic chemical vapour deposition (CCVD). The shape of the nanotubes was influenced by the addition of urea, where coiled and uncoiled tubes were obtained in the presence and absence of urea, respectively. The MWCNTs were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and nitrogen adsorption analysis. The coiling/uncoiling of the nanotubes was visualized from the SEM and TEM images of the prepared specimens. The XRD data showed the characteristic peaks of the nanotubes. BET analysis of the coiled tubes revealed 85.57 m2 g−1 surface area with a pore diameter 102.2–110.8 Å. A mechanism for the nanotubes coiling is suggested.

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Surface Morphology, Structural, and Bonding Characteristic of Carbon Nanotubes for In Vitro Culture Applications

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.667.464 ◽

2013 ◽

Vol 667 ◽

pp. 464-467

Author(s):

I. Nurulhuda ◽

Mohd Amri Johari ◽

Mat Zain Mazatulikhma ◽

Mohamad Rusop

Keyword(s):

Electron Microscopy ◽

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Multiwall Carbon Nanotubes ◽

In Vitro Study ◽

Characterization Methods ◽

Multiwall Carbon ◽

Bonding Characteristic ◽

Scanning Electron

In this paper, carbon nanotubes were characterized by several characterization methods such as FESEM (field emission scanning electron microscopy), Raman spectroscopy and fourier transform infrared (FTIR) spectroscopy. FESEM is used to characterize the morphology of carbon nanotubes, the structural is characterize by raman spectroscopy and bonding characteristic is determine by FTIR. The morphology of CNTs is found to be multiwall carbon nanotubes with diameter around 30-50 nm. D-peak was observed at 1341 Cm-1 and G-peak at 1575 Cm-1 based on raman spectroscopy result. The chemical bonding observed at range 2400 - 400 from FTIR spectra. These CNTs will be used for in vitro study in future.

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