Addition Of Functionalized Multiwalled Carbon Nanotubes Research Articles

Fabrication of multiwalled carbon nanotubes/carrageenan-chitosan@ Ce and Sr substituted hydroxyapatite biocomposite coating on titanium: In vivo bone formation evaluations

Mineral substituted hydroxyapatite (MHAp) is one of the most significant bony mineral parts that have been broadly utilized as bony substitution matters as a result of its cytocompatible and bioactive properties. Though, the utilization of hydroxyapatite as bony inserts is confined because of its poor mechanical and fragile properties. To conquer this deformity and to produce appropriate bony embed substance; hydroxyapatite is joined with biocompatible macromoles (kappa-Carrageenan (KCG) and chitosan (CTS)). To improve the mechanical strength of the hydroxyapatite based biocomposite, functionalized multiwalled carbon nanotubes (FMWCNT) is joined to the biocomposite, which has for quite some time been considered for hard and delicate tissue implant because of its remarkable auxiliary and mechanical characteristic properties. It is outstanding that FMWCNT platform is the most-conspicuous substance for the hard tissues reproduction. We have developed a novel FMWCNT/KCG@MHAp nanocomposite on titanium (Ti) implant. The developed nanocomposite coatings implants were portrayed by different strategies (SEM, XRD, TEM). The outcomes show the arrangement and homogeneous conveyance of constituents in the nanocomposite coatings. Addition of FMWCNT and KCG into the MHAp nanocomposite altogether improves the attachment quality and flexible modulus of the scaffolds. Moreover, the reactions of mesenchymal stem cells (MSCs) culture onto the nanocomposite coating show that the suitability of cells was significantly high for FMWCNT and KCG consolidated MHAp than for MHAp. Animal model examinations demonstrate the nearness of delicate osteoblast and fibrous tissue development with no noteworthy provocative symptoms, which recommends that the Addition of FMWCNT and KCG encourage the great biochemical role of MHAp. For load-bearing applications, examine in different bony models is expected to substantiate the medical accessibility. In this manner, from the acquired outcomes, we propose that FMWCNT/KCG@MHAp nanocomposite can be considered as a prospective possibility for orthopedic applications.

Dielectric, electric and thermal properties of carboxylic functionalized multiwalled carbon nanotubes impregnated polydimethylsiloxane nanocomposite

The dielectric, electric and thermal properties of carboxylic functionalized multiwalled carbon nanotubes (F-MWCNT) incorporated into the polydimethylsiloxane (PDMS) were evaluated to determine their potential in the field of electronic materials. Carboxylic functionalization of the pristine multi walled carbon tubes (Ps-MWCNT) was confirmed through Fourier transform infrared spectroscopy, X-ray diffraction patterns for both Ps-MWCNTs and F-MWCNTs elaborated that crystalline behavior did not change with carboxylic moieties. Thermogravimetric and differential thermal analyses were performed to elucidate the thermal stability with increasing weight % addition of F-MWCNTs in the polymer matrix. Crystallization/glass transition / melting temperatures were evaluated using differential scanning calorimeter and it was observed that glass transition and crystallization temperatures were diminished while temperatures of first and second melting transitions were progressed with increasing F-MWCNT concentration in the PDMS matrix. Scanning electron microscopy and energy dispersive x-ray spectroscopy were carried out to confirm the morphology, functionalization, and uniform dispersion of F-MWCNTs in the polymer matrix. Electrical resistivity at temperature range (100–300°C), dielectric loss (tanδ) and dielectric parameters (ϵ/ ϵ//) were measured in the frequency range (1MHz–3GHz). The measured data simulate that the aforementioned properties were influenced by increasing filler contents in the polymer matrix because of the high polarization of conductive F-MWCNTs at the reinforcement/polymer interface.

Novel functionalized carbon nanotubes for improving the surface properties and performance of polyethersulfone (PES) membrane

Amine functionalized Multi-walled carbon nanotubes (F-MWCNTs)/polyethersulfone (PES) membranes were prepared using phase inversion induced by immersion precipitation. Crude MWCNTs were chemically treated using strong acids (H 2SO 4/HNO 3) and 1,3-phenylenediamine (mPDA) to produce the functional amine groups ( NH 2) on their surfaces. F-MWCNTs with different concentration were blended in the casting solution containing PES, polyvinylpyrrolidone (PVP) and dimethylacetamide (DMAC). Pure water was used as non-solvent. The FTIR spectra indicated that the amine functional groups were produced on the surface of MWCNTs. The membranes prepared with different concentrations of F-MWCNTs were characterized using contact angle, field emission scanning electron microscopy (FESEM), scanning electron microscopy (SEM), atomic force microscopy (AFM) and permeation tests. The surface hydrophilicity of membranes was significantly improved by addition of F-MWCNTs in the casting solution. An increment in the porosity, pore size and surface roughness of the membranes was observed by increasing F-MWCNTs content up to 1 wt.%. Further addition of F-MWCNTs caused a reduction in porosity and roughness of formed membrane. The membranes prepared with 0.5 and 1 wt.% of F-MWCNTs showed higher performance than neat membrane. Addition of F-MWCNTs in the casting solution improved the BSA rejection and antifouling properties of PES membrane.