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Bhattarai, Deval Prasad,Shrestha, Sita,Shrestha, Bishnu Kumar,Park, Chan Hee,Kim, Cheol Sang Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.350 No.-
<P><B>Abstract</B></P> <P>In this work, titanium oxide nanotubes (TNTs) have been developed via electrochemical anodization process, followed by potentiostatic electropolymerization of aniline monomer to achieve TNTs coated polyaniline (PANI) substrate using cyclic voltammetry method at low temperature. Prior to PANI decoration, crystallinity of titanium oxide nanotubes (TNTs) was obtained by annealing the substrate at 420 °C for two hours. The physicochemical characterization of the as-prepared TNTs and TNTs/PANI were analyzed using FE-SEM, AFM, XRD and FT-IR techniques. A coating of PANI forms a sheath around the nanotubes and protects them from metallic corrosion. Large surface area to volume ratio of TNTs showed improved properties in biocompatibility, thermal stability, electrical conductivity, biomineralization and hydrophilicity after coating with PANI, an electroactive conducting polymer. In addition, the TNTs/PANI exhibited an effective platform to enhance attachment, development and proliferation of preosteoblast (MC3T3-E1) cells which opens a new avenue in the realm of bone tissue engineering. The cells’ morphology to their surrounding topography, development, or proliferation, and osteogenic-related markers (such as ALP increased level, collagen type I secretion) were also analysed. Such types of surface modification tailoring on titanium nanotubes could offer a potential and a promising scaffold material for biomedical implantation in bone tissue engineering.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A uniform surface topography of titanium nanotubes (TNTs) were fabricated through anodization. </LI> <LI> The TNTs were coated with polyaniline (PANI) via cyclic voltammetric technique. </LI> <LI> The bioinspired TNTs/PANI showed an effective antibacterial property. </LI> <LI> Highly biocompatible TNTs/PANI scaffolds enhanced the proliferation of pre-osteoblast cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Deval Prasad Bhattarai,Ganesh Prasad Awasthi,Bikendra Maharjan,Joshua Lee,김범수,박찬희,김철상 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Herein, we report the synthesis of polythiophene nanoparticles (PTh-NPs) by surfactant-free chemicaloxidative polymerization of thiophene at 37 C using ammonium persulphate as oxidant. PTh-NPssynthesized without surfactant were compared to those with surfactant in terms of surface morphology,crystallinity, cytotoxicity and some other aspects. Thermogravimetric analysis showed a good thermalstability of as-synthesized PTh-NPs. In vitro biomineralization revealed the nucleation of calcium andphosphate onto the NPs. Cytotoxicity of PTh-NPs was evaluated by measuring cell viability of preosteoblastMC3T3-E1 and PC12 cell lines. PTh-NPs synthesized without using surfactant exhibited bettercell viability compared to those with surfactant.
Ganesh Prasad Awasthi,Deval Prasad Bhattarai,Bikendra Maharjan,김경석,박찬희,김철상 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Herein, we proposed, for thefirst time, a novel activated carbon (AC) material synthesized from Wisteriasinensis (WS) seeds biomass. Characterizations of the material were carried out by Field-emissionscanning electron microscopy, Transmission electron microscopy, X-ray diffraction, Raman spectroscopy,Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller specific surface area analysis. As-synthesized AC was employed as an electrode material to evaluateits applicability in energy storage devices. Results showed enhanced capacitive performance in an acidicelectrolyte compared to the neutral electrolyte at similar current density. Thus, as-synthesized AC couldbe a suitable material for energy storage applications.
김효주,Prakash Chandra Lohani,Deval Prasad Bhattarai,Tiwari Arjun Prasad,김학용 한국고분자학회 2022 Macromolecular Research Vol.30 No.11
In this work, a polycaprolactone (PCL) electrospun mat was prepared by the electrospinning method, and polypyrrole (PPy) was coated by in situ chemical polymerization in the presence of phytic acid (PA). Significant PPy coating over the electrospun mat was observed when polymerization was mediated with PA. Different physicochemical characterizations were performed. The thickness and weight of the composite mat were found to increase as a function of increasing PA content during polymerization compared to those in the absence of phytic acid. PA increased the degree of pyrrole polymerization and subsequent crosslinking, which reduced the resistivity of the composite material. It is proposed that PA enhanced the chemical polymerization of pyrrole by binding pyrrole radical cations followed by subsequent polymerization. Overall, this method of PPy-PCL composite mat production seems to be highly beneficial for large-scale production with improved conductivity at an economically cheap rate.