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Highly Conducting and Flexible Few-Walled Carbon Nanotube Thin Film
Kumar, Nanjundan Ashok,Jeon, In-Yup,Sohn, Gyung-Joo,Jain, Rahul,Kumar, Satish,Baek, Jong-Beom American Chemical Society 2011 ACS NANO Vol.5 No.3
<P>We report an effective route to prepare highly conducting and flexible few-walled carbon nanotube (FWNT) thin films. The free-standing thin films were fabricated by functionalizing FWNTs with 4-ethoxybenzoic acid (EBA) <I>via</I> a direct Friedel−Crafts acylation reaction in a nondestructive polyphosphoric acid/phosphorus pentoxide medium. The resulting ethoxybenzoyl-functionalized FWNT (EBA-<I>f</I>-FWNT) was readily dispersible in water. EBA-<I>f</I>-FWNT thin films were formed by a simple suction filtration of the dispersed solution. Electron microscopic studies were employed to characterize the morphologies of the resulting thin films. The obtained results indicate that the structure of FWNTs was not perturbed by the incorporation of EBA moieties, which were uniformly grafted onto FWNTs forming the FWNT networks. Room temperature electrical conductivity of the thin films was obtained using standard four-probe measurements, which revealed a value as high as 29 400 S m<SUP>−1</SUP>, while the tensile strength and modulus of the film were found to be about 80 MPa and 15 GPa, respectively. Cyclic voltammograms revealed a rectangular shape, with superior capacitive behaviors nearing 133 F/g for the thin films, which is very attractive for capacitor applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-3/nn103630y/production/images/medium/nn-2010-03630y_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn103630y'>ACS Electronic Supporting Info</A></P>
Certain Subclasses of Bi-Starlike and Bi-Convex Functions of Complex Order
MAGESH, NANJUNDAN,BALAJI, VITTALRAO KUPPARAOo Department of Mathematics 2015 Kyungpook mathematical journal Vol.55 No.3
In this paper, we introduce and investigate an interesting subclass $M_{\Sigma}({\gamma},{\lambda},{\delta},{\varphi})$ of analytic and bi-univalent functions of complex order in the open unit disk ${\mathbb{U}}$. For functions belonging to the class $M_{\Sigma}({\gamma},{\lambda},{\delta},{\varphi})$ we investigate the coefficient estimates on the first two Taylor-Maclaurin coefficients ${\mid}{\alpha}_2{\mid}$ and ${\mid}{\alpha}_3{\mid}$. The results presented in this paper would generalize and improve some recent works of [1],[5],[9].
Joghee Nanjundan,Channappa Manjunatha,Jalli Radhamani,Ajay Kumar Thakur,Rashmi Yadav,Arun Kumar,Mohan Lal Meena,Rishi Kumar Tyagi,Devender Kumar Yadava,Dhiraj Singh 한국식물병리학회 2020 Plant Pathology Journal Vol.36 No.2
Powdery mildew of Indian mustard (Brassica juncea), caused by Erysiphe cruciferarum, is emerging as ma- jor problem in India. All the Indian mustard cultivars presently grown in India are highly susceptible to pow- dery mildew and so far no resistance source has been reported. In this study, with an aim to identify resistant source, 1,020 Indian mustard accessions were evaluated against E. cruciferarum PMN isolate, at Wellington, The Nilgiris, Tamil Nadu, India under natural hot spot conditions. The study identified one accession (RDV 29) with complete resistance against E. cruciferarum PMN isolate for the first time, which was consistent in five independent evaluations. Genetic analysis of F1, F2 and backcross populations obtained from the cross RSEJ 775 (highly susceptible) × RDV 29 (highly resistant) for two season revealed that the resistance is governed by two genes with semi-dominant and gene dosage effect. Further, a new disease rating system using six scales (0, 1, 2, 3, 4, and 5) has also been proposed in this study to score powdery mildew based on progress of fungal growth in different plant parts of the F2 population. The outcome of this study viz. newly identified powdery mildew-resistant Indian mustard accession (RDV 29), information on inheritance of resistance and the newly developed disease rating scale will provide the base for development of powdery mildew-resistant cultivars of Indian mustard.
Kumar, Nanjundan Ashok,Bund, Andreas,Cho, Byung Gwon,Lim, Kwon Taek,Jeong, Yeon Tae IOP Pub 2009 Nanotechnology Vol.20 No.22
<P>A well-reproducible and completely green route towards highly water dispersible multi-walled carbon nanotubes (MWNT) is achieved by a non-invasive, polymer wrapping technique, where the polymer is adsorbed on the MWNT’s surface. Simply mixing an amino-acid-based polymer derivative, namely poly methacryloyl β-alanine (PMBA) with purified MWNTs in distilled water resulted in the formation of PMBA–MWNT nanocomposite hybrids. Gold nanoparticles (AuNPs) were further anchored on the polymer-wrapped MWNTs, which were previously sonicated in distilled water, via the hydrogen bonding interaction between the carboxylic acid functional groups present in the polymer-modified MWNTs and the citrate-capped AuNPs. The surface morphologies and chemistries of the hybrids decorated with nanoparticles were characterized by transmission electron microscopy (TEM) and UV–visible absorption spectroscopy. Additionally, the composites were also prepared by the <I>in situ</I> free radical polymerization of the monomer, methacryloyl β-alanine (MBA), with MWNTs. Thus functionalized MWNTs were studied by thermogravimetric analysis (TGA), field emission scanning electron microscopy (FE-SEM) and TEM. Both methods were effective in the nanotube functionalization and ensured good dispersion and high stability in water over three months. Due to the presence of the high densities of carboxylic acid functionalities on the surface of CNTs, various colloidal nanocrystals can be attached to MWNTs. </P>
Magesh, Nanjundan,Porwal, Saurabh,Themangani, Rajavadivelu Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.3
The purpose of this present paper is to obtain inclusion relations between various subclasses of harmonic univalent functions by using the convolution operator associated with generalized distribution series. To be more precise, we obtain such inclusions with harmonic starlike and harmonic convex mappings in the plane.
Kumar, Nanjundan Ashok,Jeong, Yeon Tae John Wiley Sons, Ltd. 2010 Polymer international Vol.59 No.10
<P>A new and effective route to synthesize conducting polyaniline-multiwalled carbon nanotube (PANI -f-MWNT) nanocomposites (where ‘f’ denotes that the MWNTs have been functionalized) starting with amine-protected 4-aminophenol is reported. Aminophenol-functionalized MWNTs were initially synthesized by functionalizing acyl chloride-terminated nanotubes with N-(tert-butoxycarbonyl)-4-aminophenol followed by the in situ chemical oxidative grafting of aniline in the presence of ammonium persulfate as an oxidizing agent. Control of the morphology and thickness of the polymer–MWNT nanocomposites was achieved by varying the weight ratios of aniline monomers and MWNTs in the polymerization process. Fourier transform infrared spectroscopy was employed to characterize the initial changes in surface functionalities which also confirmed that PANI was covalently grafted to the MWNTs. Electron microscopy and UV-visible absorption spectroscopy were employed to characterize the morphology and chemical structure of the resulting hybrids. The results obtained indicate that the structure of the MWNTs was not perturbed by the incorporation of PANI. The content of the polymer in the nanocomposites was determined thermogravimetrically, while the electrical conductivity was obtained using four-probe measurements. The PANI -f-MWNT nanocomposites were adopted as templates for further decoration with gold nanoparticles in solution, thus opening new possibilities for their prospective technological applications. Copyright © 2010 Society of Chemical Industry</P> <B>Graphic Abstract</B> <P>Oxidized MWNTs were functionalized with aminophenol and a further oxidative polymerization procedure carried out for loading gold nanoparticles. <img src='wiley_img_2010/09598103-2010-59-10-PI2876-gra001.gif' alt='wiley_img_2010/09598103-2010-59-10-PI2876-gra001'> </P>