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Dhand, Vivek,Rao, M. Venkateswer,Prasad, J.S.,Mittal, Garima,Rhee, Kyong Yop,Kim, Hyeon Ju,Jung, Dong Ho 한국탄소학회 2014 Carbon Letters Vol.15 No.3
Amorphous agglomerates of carbon nanospheres (CNS) with a diameter range of 10-50 nm were synthesized using the solution combustion method. High-resolution transmission elec-tron microscopy (HRTEM) revealed a densely packed high surface area of SP2-hybridized carbon; however, there were no crystalline structural components, as can be seen from the scanning electron microscopy, HRTEM, X-ray diffraction, Raman spectroscopy, and ther-mal gravimetric analyses. Electrochemical and thermo catalytic decomposition study results show that the material can be used as a potential electrode candidate for the fabrication of energy storage devices and also for the production of free hydrogen if such devices are used in a fluidized bed reactor loaded with the as-prepared CNS as the catalyst bed.
Dhand, Vivek,Hong, Soon Kyu,Li, Luhe,Kim, Jong-Man,Kim, Soo Hyung,Rhee, Kyong Yop,Lee, Hyung Woo Elsevier 2019 Composites Part B, Engineering Vol.160 No.-
<P><B>Abstract</B></P> <P>PVDF-CNT membranes were fabricated using thermally induced phase separation (TIPS) protocol. The membranes are extremely tensile, strong and robust. Membranes exhibit hydrophilic behavior with decreasing contact angle (CA < 90°) in saline environment. Crystal study (XRD) of membranes reveals ɑ-phased PVDF with hexagonal (002) oriented CNTs within the polymer matrix. The morphology (SEM) and thermal analysis (TGA) reveals that the material is made of several porous zones and the material is chemically and thermally stable up to 500 °C. Raman and FTIR spectrum shows ordered bands of the D and G with complete grafting of PVDF bonds with CNTs respectively.</P>
Preparation, characterization and application of polyaniline nanospheres to biosensing
Dhand, Chetna,Das, Maumita,Sumana, Gajjala,Srivastava, Avanish Kumar,Pandey, Manoj Kumar,Kim, Cheol Gi,Datta, Monika,Malhotra, Bansi Dhar Royal Society of Chemistry 2010 Nanoscale Vol.2 No.5
<P>Polyaniline nanospheres (PANI-NS) prepared by morphological transformation of micelle polymerized camphorsulfonic acid (CSA) doped polyaniline nanotubes (PANI-NT) in the presence of ethylene glycol (EG) have been characterized by X-ray diffraction, atomic force microscopy, transmission electron microscopy, scanning electron microscopy, Fourier transform infra-red and UV-Visible spectroscopy. A PANI-NS (60–80 nm) film deposited onto an indium-tin-oxide (ITO) coated glass plate by the solution casting method has been utilized for covalent immobilization of biomolecules (cholesterol oxidase (ChOx)) <I>via</I><I>N</I>-ethyl-<I>N</I>′-(3-dimethylaminopropyl) carbodiimide (EDC) and <I>N</I>-hydroxysuccinimide (NHS) chemistry for fabrication of a cholesterol biosensor. The ChOx/PANI-NS/ITO bioelectrode detects cholesterol in the concentration range of 25 to 500 mg dL<SUP>−1</SUP> with sensitivity of 1.3 × 10<SUP>−3</SUP> mA mg<SUP>−1</SUP> dL and regression coefficient of 0.98. Further, this PANI-NS based bioelectrode shows fast response time (10 s), low Michaelis–Menten constant (2.5 mM) and shelf-life of 12 weeks. The spherical nanostructure observed in the final morphology of the PANI-NS film is attributed to hydrogen bonding interactions between PANI-NT and EG.</P> <P>Graphic Abstract</P><P>Morphological transformation of CSA-PANI nanotubes to nanospheres in EG <I>via</I> solvation energy generated from hydrogen bonding interactions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b9nr00346k'> </P>
The facile and low temperature synthesis of nanophase hydroxyapatite crystals using wet chemistry
Dhand, V.,Rhee, K.Y.,Park, S.J. Elsevier 2014 Materials Science and Engineering C Vol.36 No.-
A simple and facile wet chemistry route was used to synthesize nanophase hydroxyapatite (HaP) crystals at low temperature. The synthesis was carried out at a pH of 11.0 and at a temperature of 37<SUP>o</SUP>C. The resulting samples were washed several times and subjected to further analysis. XRD studies revealed that the HaP crystals were polycrystalline in nature with a crystallite size of ~15-60+/-5nm. SEM-EDXA images confirmed the presence of calcium (Ca), phosphorous (P), and oxygen (O) peaks. Likewise, FTIR confirmed the presence of characteristic phosphate and hydroxyl peaks in samples. Lastly, HRTEM images clearly showed distinctive lattice fringes positioned in the 100 and 002 planes. TGA analysis shows that HaP crystals can withstand higher calcination temperatures and are thermally stable.
A Comprehensive Review of Graphene Nanocomposites: Research Status and Trends
Dhand, Vivek,Rhee, Kyong Yop,Ju Kim, Hyun,Ho Jung, Dong Hindawi Limited 2013 Journal of nanomaterials Vol.2013 No.-
<P>This paper provides a comprehensive review of the present trends in graphene research with an emphasis on graphene-based nanocomposites and their applications. Various synthesis routes have recently been devised for mass production of graphene to address the needs of the composite industry. This paper describes the worldwide scenario of research and patents being conducted in the field of graphene nanocomposites. It concludes with a discussion of the impact of graphene in composites and the future challenges to meeting industrial demands.</P>
Dhand, V.,Bharadwaj, S.,Amareshwari, K.,Himabindu, V.,Rhee, K.Y.,Park, S.J.,Hui, D. New York] ; North-Holland 2015 APPLIED SURFACE SCIENCE - Vol.359 No.-
High density, soot free, novel and a facile approach toward synthesis of carbon nanoropes (CNRs) were successfully carried out in a chemical vapor deposition (CVD) process. Manganese ferrite (MnFe<SUB>2</SUB>O<SUB>4</SUB>) coated on stainless steel foil (SS 316 grade) was used as a catalyst to initiate the growth of CNR. The coated catalyst was introduced into the CVD and the chamber temperature was set at 700<SUP>o</SUP>C later followed with the release of acetylene (50sccm) and nitrogen (500sccm) gas, respectively. Total reaction continued until 30min. No purification or oxidation process of the soot was involved. Analysis reveals the presence of intermingled CNRs with semi crystalline nature of the sample. The elemental analysis confirms the presence of manganese and iron whereas Raman spectrum shows the characteristic narrow G and D bands. The sample displays a super-paramagnetic behavior and is thermally stable up to 500-550<SUP>o</SUP>C presenting a strong exothermic reaction.
Dhand, V.,Venkateswer Rao, M.,Mittal, G.,Rhee, K.Y.,Park, S.J. Elsevier 2015 Current Applied Physics Vol.15 No.3
An in-situ approach to synthesize lithium-graphite nanotubes (LGN) is demonstrated using chemical vapour deposition (CVD). Lithium acetate was used as precursor and as a self-intercalating agent in the presence of copper. Methane was selected as the secondary carbon source. To synthesize lithium-graphite nanotubes (LGN), CVD reactor was set to 500 <SUP>o</SUP>C in the presence of argon (200 sccm), hydrogen (40 sccm) and methane (75 sccm) gas under atmospheric conditions. X-ray diffraction shows that the samples are highly crystalline with the c-axis oriented toward the (002) and (111) planes of the graphitic carbon. High resolution transmission and scanning electron microscopic analyses of the samples shows that lithium has been doped into the layers of graphitic carbon matrix. They also show the formation of an alloy phase with distinctive lattice boundaries and stacked graphitic carbon with a small number of nanorods (lithium carbide). HR-Raman analysis shows the characteristic D and G bands of SP<SUP>2</SUP> carbon with a narrow G band and broad D band indicating defects produced through doping. X-ray photoelectron spectroscopy results show the presence of predominant lithium and carbon peaks. Thermal analysis shows that the sample is stable up to 300 <SUP>o</SUP>C in air.
REVIEW OF FLYWHEEL BASED INTERNAL COMBUSTIONENGINE HYBRID VEHICLES
A. DHAND,K. PULLEN 한국자동차공학회 2013 International journal of automotive technology Vol.14 No.5
Hybrid vehicles of different configurations and utilizing different energy storage systems have existed indevelopment for many decades and more recently in limited production. They can be grouped as parallel, series or complexhybrids. Another classification is micro, mild and full hybrids which makes the distinction on the basis of functionality. Thecommon energy storage systems in hybrid vehicles are batteries, supercapacitors and high speed flywheels. This paper aimsto review a specific type of hybrid vehicle which involves the internal combustion engine (ICE) as the prime mover and thehigh speed flywheel as an energy storage device. Such hybrids are now attracting considerable interest given their potentialfor low cost. It is hence timely to produce a review of research and development in this subject. The flywheel is coupled tothe drive line with a continuous variable transmission (CVT). The CVT can be of various types such as electrical, hydraulicor mechanical but usually in this case it is a non-electrical one. Different configurations are possible and the paper providesa timeline of the development of such powertrains with various examples. These types of hybrid vehicles have existed asprototypes for many decades and the authors believe that their development has reached levels where they can be consideredserious contenders for production vehicles.