Transition and Metastasis of Carcinomas: Critical role of G Protein Signaling

DHANASEKARAN Danny N.,JAYARAMAN Muralidhran,HA Ji Hee 大韓藥學會 2010 大韓藥學會 總會 및 學術大會 Vol.2010 No.2

Microstructural properties evaluation of SnSSe alloy films

Dhanasekaran, V.,Sundaram, K.,Jung, J.,Mahalingam, T. Springer Science + Business Media 2015 Journal of materials science Materials in electron Vol.26 No.3

Construction of dye-sensitized solar cells using wet chemical route synthesized MoSe2 counter electrode

Dhanasekaran Vikraman,Supriya A. Patil,Sajjad Hussain,Naveed Mengal,정성훈,정종완,박휘준,김학성,김현석 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-

This paper presents a simple and large area wet chemical preparation route for molybdenum diselenide (MoSe2) atomic layers. MoSe2 was synthesized onto fluorine doped tin oxide substrates and could be directly used as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). The role of deposition time on the growth of MoSe2 CE was elaborately discussed using Raman, X-ray diffraction and photoluminescence studies. Influence of wet chemical growth time on the surface modification of MoSe2 CE was evidently demonstrated by scanning electron microscopy and atomic force microscopy studies. The MoSe2 CE electrode has lower charge transfer resistance and superior electrocatalytic activity towards triiodide/iodide redox behavior, comparable to conventional Pt CEs. High power conversion efficiency of 7.28% was achieved, equivalent to scarce noble metal Pt CE (7.40%). Uniform surface morphology with active edge sites highly dominated to promote the superior electrocatalytic activity. This work opens a way to use an economical wet chemical method to fabricate the layered MoSe2 CE as a replacement for high cost Pt based CE for DSSCs.

Optical, electrical and microstructural studies of monoclinic CuO nanostructures synthesized by a sol–gel route

Dhanasekaran, V.,Soundaram, N.,Kim, Seong-Il,Chandramohan, R.,Mantha, Srinivas,Saravanakumar, S.,Mahalingam, T. The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.6

<P>We have reported on the synthesis of CuO nanostructures <I>via</I> a simple sol–gel approach with high yield at low cost by the reduction of aqueous solutions of Cu(NO<SUB>3</SUB>)<SUB>2</SUB> and Na<SUB>2</SUB>NO<SUB>3</SUB>. Synthesized nanostructures were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), fluorescence spectroscopy, Raman scattering and UV-Vis-NIR spectroscopy. Structural studies revealed that the prepared CuO nanostructures were polycrystalline in nature with monoclinic structure. The crystallite size of CuO nanostructures was estimated to be ∼10 nm using Debye–Scherrer's formula. The uniform and nanoregime grains were observed in SEM micrographs. The optical band gap value was estimated to be 1.2 eV using Tauc's plot. The Raman scattering investigations revealed A<SUB>g</SUB> and B<SUB>g</SUB> mode peaks at 278 cm<SUP>−1</SUP>, 332 cm<SUP>−1</SUP> and 618 cm<SUP>−1</SUP>, respectively.</P> <P>Graphic Abstract</P><P>A<SUB>g</SUB> and B<SUB>g</SUB> mode vibration peaks are observed in the Raman spectrum with a lower optical band gap of 1.2 eV. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj00084f'> </P>

Finite Element Modeling of Beam with Piezoelectric/Piezomagnetic Sensors under Uniform Temperature

Dhanasekaran Rajagopal,A. Kumaravel,S. Arunprasath,M. Dinesh Babu,S. Elayaraja 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.1

The present study aims to investigate the behaviour of mild steel beams subjected to multi-phase magnetoelectroelastic,piezoelectric, or magnetostrictive patches, taking into account the effects of temperature. A finite element method wasemployed to analyze the electric and magnetic potential of the structure while considering the coupling effects. The findingsof this study could provide valuable insights into the behaviour of such structures under varying temperature conditions andcontribute to the development of advanced technologies in the field of material science and engineering. Under homogeneoustemperature load, the current formulation shows the ability to anticipate the thermal deformation and sensor behaviour of thepiezoelectric/ piezo magnetic, magnetostrictive patches. A distinct variation characterizes the positioning of the sensor layer inthe beam, and the upper surface of the layer is plotted with transverse displacement, electric potential, and magnetic potentialalong its length. A comparative numerical analysis was conducted to assess the behaviour of multiphase magneto-electroelastic,magnetostrictive, and piezoelectric sensor materials concerning magnetic and electric potential. The investigation hasbeen conducted under various boundary conditions.

Comparison studies on electrodeposited CdSe, SnSe and Cd x Sn1−x Se thin films

Dhanasekaran, V.,Jung, J.,Lee, K. K.,Mahalingam, T. Springer Science + Business Media 2015 Ionics Vol.21 No.4

<P>Electroplated cadmium stannous selenide (Cd (x) Sn1-x Se) thin films were coated on indium-doped tin oxide (ITO) conducting glass substrates from aqueous bath solutions containing CdCl2, SnCl2, and Na2SeO3. The x value was tuned by change in metal ion source concentration of the electrolytic bath solution. The various x values such as 1, 0.7, 0.45, and 0, of Cd (x) Sn1-x Se thin films were characterized by structural, morphological, compositional, and optical properties using X-ray diffraction, scanning electron microscopy, energy dispersive analysis by X-rays, and UV-vis-NIR spectrophotometer, respectively. X-ray diffraction (XRD) patterns revealed that the deposited films exhibit polycrystalline nature Cd (x) Sn1-x Se thin films. The microstructural parameters such as crystallite size, dislocation density, microstrain, and number of crystallites per unit area were calculated and presented. Morphological studies revealed that spherical-shaped grains were observed in cadmium-dominated films and nano-rod-shaped grains were observed in tin-dominated films. Optical properties of CdSnSe films were determined from optical transmittance data in the spectral range 400 to 1,100 nm. The optical direct transition energy band gap was estimated using conventional method, and band gap energy was lying between 1.02 and 1.83 eV. The refractive index, extinction coefficient, and real and imaginary parts of dielectric constants were calculated using optical transmission spectra of Cd (x) Sn1-x Se thin films.</P>

Direct synthesis of thickness-tunable MoS₂ quantum dot thin layers: Optical, structural and electrical properties and their application to hydrogen evolution

Vikraman, Dhanasekaran,Akbar, Kamran,Hussain, Sajjad,Yoo, Geonwook,Jang, Ji-Yun,Chun, Seung-Hyun,Jung, Jongwan,Park, Hui Joon Elsevier 2017 Nano energy Vol.35 No.-

<P><B>Abstract</B></P> <P>We report a layer thickness-tunable direct synthesis growth method for bi- to few-layer crystalline molybdenum disulfide (MoS<SUB>2</SUB>) thin layers. For the first time, a facile, cost effective, and mass-scalable direct synthesis approach, based on a chemical bath deposition, is designed for quantum dot(QD)-based MoS<SUB>2</SUB> layers using (NH<SUB>4</SUB>)<SUB>6</SUB>Mo<SUB>7</SUB>O<SUB>24</SUB> and thiourea (CH<SUB>4</SUB>N<SUB>2</SUB>S) as precursors. Using this process, the uniformity of large area thin layer can be retained, and the applicability to various substrates can provide great opportunities in the fabrication of various atomically thin layered structures. The structural and optical properties of the MoS<SUB>2</SUB> QD layers are systematically investigated. Raman, AFM and TEM analyses confirm the formation of continuous and crystalline bi-, tri- and few-layered MoS<SUB>2</SUB>. Their electrical properties are evaluated by bottom-gate FETs, and a field-effect mobility value of ~1.06cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> and a current on/off ratio in the order of ~ 10<SUP>5</SUP> are obtained. Particularly, MoS<SUB>2</SUB> prepared as a thin film consisting QD structures of grains shows novel electrocatalytic property. MoS<SUB>2</SUB> QDs on Au/Si are proven to be excellent electrocatalysts for hydrogen evolution reaction, featured by Tafel slope (94mVdecade<SUP>−1</SUP>), exchange current density (1.91×10<SUP>-1</SUP> mAcm<SUP>−2</SUP>) and long-term durability for 20h. Our approach opens new avenues for the design and synthesis of functional MoS<SUB>2</SUB> layers for energy harvesting.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A layer thickness-tunable direct synthesis growth method for bi- to few-layer crystalline MoS<SUB>2</SUB> thin layers is reported. </LI> <LI> This approach is applicable to various substrates. </LI> <LI> The structural and optical properties of the synthesized MoS<SUB>2</SUB> layers are systematically investigated. </LI> <LI> The electrical properties of the synthesized MoS<SUB>2</SUB> layers are evaluated by bottom-gate FETs. </LI> <LI> MoS<SUB>2</SUB> QDs on Au/Si are proven to be excellent electrocatalysts for hydrogen evolution reaction. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Facile and cost-effective methodology to fabricate MoS₂ counter electrode for efficient dye-sensitized solar cells

Vikraman, Dhanasekaran,Patil, Supriya A.,Hussain, Sajjad,Mengal, Naveed,Kim, Hyun-Seok,Jeong, Sung Hoon,Jung, Jongwan,Kim, Hak-Sung,Park, Hui Joon Elsevier 2018 Dyes and pigments Vol.151 No.-

<P><B>Abstract</B></P> <P>Interests in the development of economical and high-efficiency counter electrodes (CEs) of dye-sensitized solar cell (DSSC) to replace the excessively cost and scarce platinum (Pt) CEs have been increased. In this report, we demonstrate a facile chemical bath deposition (CBD) route to prepare layered MoS<SUB>2</SUB>/fluorine-doped tin oxide (FTO) films that directly act as the CEs of DSSCs. A DSSC containing the CBD-synthesized MoS<SUB>2</SUB>/FTO CE (prepared at 0.03 M Mo source concentration, 90 °C bath temperature and 30 min deposition time) exhibits high power conversion efficiency (PCE) of 7.14%, which is approaching that of DSSC with Pt/FTO CE (8.73%). The electrocatalytic activity of the MoS<SUB>2</SUB>/FTO and Pt/FTO CEs are discussed in detail with their cyclic voltammetry (CV), Tafel polarization curves, and electrochemical impedance spectra (EIS). The observed results indicate that our low-cost CE has a high electrocatalytic activity for the reduction of triiodide to iodide and a low charge transfer resistance at the electrolyte–electrode interface with a comparable state to that of a Pt/FTO CE.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Crystalline MoS<SUB>2</SUB> thin layers are grown on FTO using chemical bath deposition (CBD) method. </LI> <LI> The structural and optical properties of the synthesized MoS<SUB>2</SUB> layers are systematically investigated. </LI> <LI> The electrocatalytic activity of the CBD-synthesized MoS<SUB>2</SUB>/FTO is discussed with their CV, Tafel and EIS curves. </LI> <LI> A DSSC containing the MoS<SUB>2</SUB>/FTO CE exhibits high power conversion efficiency of 7.14%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Gastroprotective effect of epoxy clerodane diterpene isolated from Tinospora cordifolia Miers (Guduchi) on indomethacin-induced gastric ulcer in rats

Antonisamy, P.,Dhanasekaran, M.,Ignacimuthu, S.,Duraipandiyan, V.,Balthazar, J.D.,Agastian, P.,Kim, J.H. G. Fischer 2014 Phytomedicine Vol.21 No.7

The present study evaluated the gastroprotective effect of epoxy clerodane diterpene (ECD), isolated from Tinospora cordifolia on indomethacin-induced gastric ulcer in rats. Administration of indomethacin exhibits extreme levels of ulcer index (UI) and myeloperoxidase (MPO) activity. Indomethacin down regulated PGE<SUB>2</SUB>, anti-inflammatory cytokines (IL-4, IL-10) and pro-angiogenic factors (VEGF and EGF). The ECD pretreatment considerably increased the levels of PGE<SUB>2</SUB>, anti-inflammatory cytokines and pro-angiogenic factors. The ulcer-healing activity of ECD was inhibited by pre-administration of the specific COX-1 inhibitor (SC560) and nonspecific NOS inhibitor (l-NAME), which indicates the involvement of PGE<SUB>2</SUB> and NOS in ECD induced ulcer healing activity. These findings suggest that ECD exerts its antiulcer activity by reinforcement of defensive elements and diminishing the offensive elements.

Chitin and Chitosan Based Hybrid Nanocomposites for Super Capacitor Applications

Anandhavelu, S.,Dhanasekaran, V.,Sethuraman, V.,Park, Hui Joon American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.2

<P>In this paper, we report a facile low-cost synthesis of the chitin and chitosan-based hybrid nanocomposites for supercapacitors. The chitosan and chitin based hybrid composites functional group analysis, structural, optical and morphological properties were characterized using FTIR spectroscopy, Raman spectroscopy, UV-vis spectroscopy and scanning electron microscopy (SEM), respectively. Specific capacitance values of hybrid composites were calculated using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge analysis. The hybrid composites asymmetric supercapacitor performance was perceived in the range of -0.2 to 1.0 V. The specific capacitance value was achieved at 542.63 F g(-1) at current density value of 0.1 A g(-1) for CH-GO-ZnO/PANI hybrid composites. The prepared hybrid nanocomposites exhibit good supercapacitive performance and long-term cycle stability. These results demonstrate the potential of the CH-GO-ZnO/PANI hybrid nanocomposites as a high-performance supercapacitors.</P>