@Article{RodriguesLCSMCWL:2016:ChBiEv,
author = "Rodrigues, Bruno V. M. and Leite, Nelly C. S. and Cavalcanti,
Bruno das Neves and Silva, Newton S. da and Marciano, Fernanda R.
and Corat, Evaldo Jos{\'e} and Webster, Thomas J. and Lobo,
Anderson O.",
affiliation = "{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and
{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and
{University of Michigan} and {Universidade do Vale do
Para{\'{\i}}ba (UNIVAP)} and {Universidade do Vale do
Para{\'{\i}}ba (UNIVAP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Northeastern University} and {Universidade
do Vale do Para{\'{\i}}ba (UNIVAP)}",
title = "Graphene oxide/multi-walled carbon nanotubes as nanofeatured
scaffolds for the assisted deposition of nanohydroxyapatite:
characterization and biological evaluation",
journal = "International Journal of Nanomedicine",
year = "2016",
volume = "11",
pages = "2569--2585",
month = "June 13",
keywords = "Bactericidal effect, Bioactivity, Bone cells, Graphene oxide, In
vitro, Multi-walled carbon nanotubes, Nanohydroxyapatite, Tissue
engineering.",
abstract = "Nanohydroxyapatite (nHAp) is an emergent bioceramic that shows
similar chemical and crystallographic properties as the mineral
phase present in bone. However, nHAp presents low fracture
toughness and tensile strength, limiting its application in bone
tissue engineering. Conversely, multi-walled carbon nanotubes
(MWCNTs) have been widely used for composite applications due to
their excellent mechanical and physicochemical properties,
although their hydrophobicity usually impairs some applications.
To improve MWCNT wettability, oxygen plasma etching has been
applied to promote MWCNT exfoliation and oxidation and to produce
graphene oxide (GO) at the end of the tips. Here, we prepared a
series of nHAp/MWCNT-GO nanocomposites aimed at producing
materials that combine similar bone characteristics (nHAp) with
high mechanical strength (MWCNT-GO). After MWCNT production and
functionalization to produce MWCNT-GO, ultrasonic irradiation was
employed to precipitate nHAp onto the MWCNT-GO scaffolds (at 13
wt%). We employed various techniques to characterize the
nanocomposites, including transmission electron microscopy (TEM),
Raman spectroscopy, thermogravimetry, and gas adsorption (the
BrunauerEmmettTeller method). We used simulated body fluid to
evaluate their bioactivity and human osteoblasts (bone-forming
cells) to evaluate cytocompatibility. We also investigated their
bactericidal effect against Staphylococcus aureus and Escherichia
coli. TEM analysis revealed homogeneous distributions of nHAp
crystal grains along the MWCNT-GO surfaces. All nanocomposites
were proved to be bioactive, since carbonated nHAp was found after
21 days in simulated body fluid. All nanocomposites showed
potential for biomedical applications with no cytotoxicity toward
osteoblasts and impressively demonstrated a bactericidal effect
without the use of antibiotics. All of the aforementioned
properties make these materials very attractive for bone tissue
engineering applications, either as a matrix or as a reinforcement
material for numerous polymeric nanocomposites.",
doi = "10.2147/IJN.S106339",
url = "http://dx.doi.org/10.2147/IJN.S106339",
issn = "1176-9114",
language = "en",
targetfile = "rodrigues_graphene.pdf",
urlaccessdate = "28 abr. 2024"
}