Nanozirconia Partially Coated MWNT: Nanostructural Characterization and Cytotoxicity and Lixivation Study

2007 ◽  
Vol 361-363 ◽  
pp. 775-778 ◽  
Author(s):  
Nere Garmendia ◽  
Leire Bilbao ◽  
Roberto Muñoz ◽  
L. Goikoetxea ◽  
Ainara García ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Hydrothermal Synthesis ◽  
Multiwall Carbon Nanotubes ◽  
Ceramic Matrix ◽  
In Vitro Biocompatibility ◽  
Coated Carbon ◽  
Multiwall Carbon ◽  
Zirconia Nanoparticles ◽  
Sintered Product

Carbon nanotubes could avoid the crack propagation and enhance the toughness of the ceramic material used for prostheses applications. So nanozirconia partially coated carbon nanotubes have been obtained via hydrothermal synthesis of zirconia nanoparticles in presence of multiwall carbon nanotubes. The as covered nanotubes should have a better wettability in the ceramic matrix and improve the dispersion of the CNTs in the nanocomposite, which results in a new ceramic biomaterial with a longer lifetime and better reliability. The obtained product has been structurally characterized by several techniques such as FTIR, XRD, SEM, AFM, EELS, XPS and TGA. The citotoxicity of the sintered product was studied by the change in the pH and ICP-AES in in-vitro biocompatibility tests.

Low-temperature hydrothermal synthesis of multiwall carbon nanotubes

Carbon ◽  
2005 ◽  
Vol 43 (6) ◽  
pp. 1328-1331 ◽  
Author(s):  
Wenzhong Wang ◽  
J.Y. Huang ◽  
D.Z. Wang ◽  
Z.F. Ren
Keyword(s):  
Carbon Nanotubes ◽  
Hydrothermal Synthesis ◽  
Low Temperature ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon

Platinum nanoparticles with superacid-doped polyvinylpyrrolidone coated carbon nanotubes: electrocatalyst for oxygen reduction reaction in high-temperature proton exchange membrane fuel cell

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 41937-41946 ◽  
Author(s):  
S. Pourjafari Amyab ◽  
E. Saievar-Iranizad ◽  
A. Bayat
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Proton Exchange Membrane ◽  
Multiwall Carbon Nanotubes ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Exchange Membrane ◽  
Doped Polymer ◽  
Coated Carbon ◽  
Multiwall Carbon

In order to improve the catalytic activity and durability of proton-exchange-membrane-fuel-cells (PEMFCs), Nafion-free Pt-based catalyst using the superacid-doped polymer coated multiwall carbon nanotubes (MWCNTs) was investigated.

In Vitro Biocompatibility Test of Multiwall Carbon Nanotubes with Human Osteoblast Cells: Potential Application for Bone Implant Interface Reinforcement

2021 ◽  
Vol 21 (4) ◽  
pp. 2394-2403
Author(s):  
Krisztina Ungvári ◽  
Sándor Mészáros ◽  
Anna Szabó ◽  
Klára Hernádi ◽  
Zsolt Tóth
Keyword(s):  
Carbon Nanotubes ◽  
Cell Death ◽  
Multiwall Carbon Nanotubes ◽  
Sample Type ◽  
Human Osteoblast ◽  
Osteoblast Cell ◽  
Osteoblast Cells ◽  
Thiazolyl Blue Tetrazolium Bromide ◽  
Multiwall Carbon

Application of multiwall carbon nanotubes (MWCNT) as a filler component in composite materials can lead to remarkable increase in mechanical strength. It is a challenging application to form a living bone tissue biocomposite that is reinforced with MWCNTs at a dental implant—bone interface. The successful biointegration of MWCNT and the implant material depends on the processes of osseointegration, namely surface interactions at the molecular and cellular level. In this work the compatibility of MWCNT with main osseointegration processes has been overviewed with special attention to the toxicity of MWCNT for interacting human cells, and In Vitro experiments were performed with primary human osteoblast cells. The cells were isolated from oral bone fragments and grown in cell culture conditions. Plate wells were covered with MWCNT layers of three different densities. Osteoblast cell suspensions were placed onto the MWCNT layers and into empty plate wells. 24 and 72 hours after seeding the attachment and proliferation of cells was evaluated using Thiazolyl Blue Tetrazolium Bromide (MTT) colorimetric assay. The extent of cell death was characterized by Lactate Dehydrogenase (LDH) assay. The osteoblast cell viability tests show that cells were attached to all investigated surfaces, but with lower rate to higher density MWCNTs. A low level of cell death was observed in each sample type. Phase contrast and fluorescent microscopic observations show that although MWCNTs are not toxic for human primary osteoblast cells, an intense interaction of the cells with MWCNTs reduces their proliferation and markedly affects their morphology.

scholarly journals Hybrids of Iron-Filled Multiwall Carbon Nanotubes and Anticancer Agents as Potential Magnetic Drug Delivery Systems: In Vitro Studies against Human Melanoma, Colon Carcinoma, and Colon Adenocarcinoma

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Sławomir Boncel ◽  
Anna Pluta ◽  
Magdalena Skonieczna ◽  
Andrzej Gondela ◽  
Barbara Maciejewska ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Drug Delivery ◽  
Anticancer Agents ◽  
Multiwall Carbon Nanotubes ◽  
Colon Adenocarcinoma ◽  
Human Melanoma ◽  
Dna Intercalators ◽  
Magnetic Drug Delivery ◽  
Multiwall Carbon

Cell type, morphology, and functioning are key variables in the construction of efficient “drug-vehicle” hybrids in magnetic drug delivery. Iron-encapsulated multiwall carbon nanotubes (Fe@MWCNTs) appear as promising candidates for theranostics due to in situ chemical catalytic vapor deposition (c-CVD) synthesis, straightforward organic functionalization, and nanoneedle (1D) behavior. Here, model hybrids were synthesized by exploring C-sp2 chemistry ((1+2)-cycloaddition of nitrenes and amidation) of the outer MWCNT walls combined with anticancer agents, that is, 5-fluorouracil (5FU), purpurin (Purp), and 1,8-naphthalimide DNA intercalators (NIDIs), via linkers. Analyses of the Fe@MWCNT vehicles by SEM, TEM, and Raman spectroscopy revealed their morphology while Mössbauer spectroscopy confirmed the presence of encapsulated ferromagnetic iron-based nanodomains. Cytotoxicity of the hybrids was studied using a 24 h MTS assay combined with the apoptosis and life cycle assays against human melanoma (Me45), colon carcinoma (HCT116+), and colon adenocarcinoma (Caco-2). The cells had different sensitivity to the vehicles themselves as well as to the hybrids. MWCNT-based covalent hybrids of 5FU and Purp emerged as the most promising systems against Me45 and HCT116+ cell lines with the highest in vitro cytotoxicity and proapoptotic activity. Furthermore, nanotubes bearing 4-nitro- and 4-(N-morpholinyl)-1,8-naphthalimide DNA intercalators appear as a promising candidate for the treatment of Caco-2.

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

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.

scholarly journals Preparation and Microwave Absorbing Properties of an Electroless Ni-Co Coating on Multiwall Carbon Nanotubes Using [Ag(NH3)2]+as Activator

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Qiao-ling Li ◽  
Xiao-yong He ◽  
Yue-qing Zhang ◽  
Xiao-feng Yang
Keyword(s):  
Carbon Nanotubes ◽  
Energy Dispersive Spectrometry ◽  
Multiwall Carbon Nanotubes ◽  
Nucleation Site ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Electroless Ni ◽  
Coated Carbon ◽  
Multiwall Carbon

Ni-Co-coated carbon nanotubes (CNTs) composites with different molar ratios of Ni/Co were synthesized using [Ag(NH3)2]+as activator andH2PO2-as reductant, thereby replacing the conventional noble metal Pd salt activator and Sn2+reductant. Scanning electron microscopy, X-ray diffraction, and X-ray energy dispersive spectrometry analyses demonstrated that the CNTs were deposited with a dense, uniform Ni-Co coating. The possible mechanism of the electroless method was studied, which indicates that pure Ag0acted as a nucleation site for subsequent Ni-Co-P deposition. Network vector analyzer measurements indicated that the composite with only Ni coated had an absorbing value of −12.6 dB and the composite with a Ni/Co ratio of four had the maximum wave absorption (−15.6 dB) and the widest absorption bandwidth (800 MHz, RL < −10 dB), while the saturation magnetization (Ms) was 4.28 emu·g−1and the coercive force (Hc) was 31.33 Oe.

Toxic Effects of Multiwall Carbon Nanotubes (MWCNT) in vivo and in vitro

Pneumologie ◽  
2013 ◽  
Vol 67 (12) ◽  
Author(s):  
A Hackbarth ◽  
D Schaudien ◽  
B Bellmann ◽  
H Ernst ◽  
C Ziemann ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Toxic Effects ◽  
Multiwall Carbon

NANOTOXICITY OF MULTIWALL CARBON NANOTUBES TO A549 CELLS IN VITRO

NANO ◽  
2014 ◽  
Vol 09 (02) ◽  
pp. 1450027 ◽  
Author(s):  
FU-DE WANG ◽  
HUA ZHANG ◽  
CHAN JIN ◽  
HAO LIANG ◽  
YING TANG ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Defense Mechanism ◽  
A549 Cells ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Properties ◽  
Epithelial Cell Line ◽  
Ros Generation ◽  
Imaging Dose ◽  
Multiwall Carbon

Multiwall carbon nanotubes (MWCNTs) have been widely applied in many fields due to the excellent physical and chemical properties. As the production and applications of nanotubes expand, public concern about their potential risks to human health has also raised. Cytotoxicity of MWCNTs was evaluated in this study using a cultured human epithelial cell line A549. Uptake of MWCNTs by cultured A549 cells was observed by TEM imaging. Dose-dependent decrease of cell viability showed the cytotoxicity of MWCNTs. Significant reactive oxygen species (ROS) generation and GSH depletion which reduced the cellular antioxidant level could be the major factor of cytotoxicity induced by MWCNTs. MWCNTs seemed to trigger the activation of cell autophagy with the intracellular ATG16L1 level increase as a defense mechanism.

Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

2018 ◽  
Author(s):  
Gen Hayase
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Aqueous Solutions ◽  
High Aspect Ratio ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Nanotube Films

By exploiting the dispersibility and rigidity of boehmite nanofibers (BNFs) with a high aspect ratio of 4 nm in diameter and several micrometers in length, multiwall-carbon nanotubes (MWCNTs) were successfully dispersed in aqueous solutions. In these sols, the MWCNTs were dispersed at a ratio of about 5–8% relative to BNFs. Self-standing BNF–nanotube films were also obtained by filtering these dispersions and showing their functionality. These films can be expected to be applied to sensing materials.

Sign in / Sign up

Export Citation Format

Share Document