Enhanced luminance of MEH-PPV based PLEDs using single walled carbon nanotube composite as an electron transporting layer

An efficient electron transporting layer (ETL) based on single walled carbon nanotube (SWCNT) composites has been developed for poly [2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) based orange polymer light emitting diodes (PLEDs) and its effect on the performance of PLEDs has been examined. It is observed that with increase in SWCNT concentration, in ETL, the luminance and luminous efficiency of the PLEDs increase (about 5 times increase in luminance is observed at 5% w/w SWCNT concentration). The SWCNTs present in the MEH-PPV ETL boost the mobility of electrons injected from the cathode towards the emissive layer by establishing highly conducting percolation paths. This balances the concentration of holes and electrons in the emissive layer, which leads to enhanced emission from the PLEDs.     

Progress in Boronic Acid-Based Fluorescent Glucose Sensors

Effective management of diabetes relies on the frequent monitoring of blood glucose concentrations. The current approach of blood sampling and glucose concentration determination in vitro) presents many problems. Therefore, there is a drive for the development of non-invasive and continuous monitoring of glucose concentrations. The use of implanted glucose fluorescent sensors represents a promising approach. Due to its strong interaction with diol moieties, the boronic acid group often plays a critical role in the design of such glucose sensors. This paper reviews the progress in this area during the last ten years.     

Structure factor of amorphous TiO2 nanoparticle; Molecular Dynamics Study

Three samples of amorphous TiO₂ of 3 nm size are prepared by molecular dynamics simulations using different heating and quenching rates and open boundary conditions. Matsui–Akaogi force field is used to calculate the correlation functions. It is found that atomic distribution in these samples differ within the limit of 4%. The calculated coordination numbers suggest that 52–54% Ti atoms are 6-fold coordinated, 31–32% Ti atoms are 5-fold coordinated, 7–10% are 4-fold coordinated and few Ti atoms even 7-fold coordinated through vertex and edge sharing in these samples. On the other hand 66–68% oxygen atoms remain 3-fold coordinated, 25–28% are 2-fold coordinated and 5–6% oxygen atoms become 4-fold coordinated. Most of the over coordinated and under coordinated strained structures are in the core and surface regions respectively. The agreement between the calculated and measured reduced structure factors suggests that atomic arrangements in the laboratory samples prepared by sputtering and sol-gel methods may be similar to those predicted by molecular dynamics simulations.     

Effect of nonthermal ion distribution and dust temperature on nonlinear dust acoustic solitary waves

The effects of nonthermal ion distribution and finite dust temperature are incorporated in the investigation of nonlinear dust acoustic waves in an unmagnetized dusty plasma. Sagdeev pseudopotential method which takes into account the full nonlinearity of plasma equations, is used here to study solitary wave solutions. Possibility of co-existence of refractive and compressive solitons as a function of Mach number, dust temperature and concentration of nonthermal ions, is considered. For the fixed value of nonthermal ions, it is found that the effect of increase in dust temperature is to reduce the range of co-existence of compressive and refractive solitons. Particular concentration of nonthermal ions results in disappearance of refractive solitons while the decrease in dust temperature, at this concentration restores the lost refractive solitons.     

Multiple positive solutions for a quasilinear elliptic equation with critical exponential nonlinearity

Let Ω be a bounded domain in R^N,N≥2, with C² boundary. In this work, we study the existence of multiple positive solutions of the following problem:

     

Volumetric and Acoustic Behavior of PEG-200 and PEG-600 in Aqueous D-Mannitol solutions at Different Temperatures

Journal of Solution Chemistry - The interlinkage among the molecules of polyethylene glycols (PEG-200 and PEG-600) in aqueous D-Mannitol solutions are analyzed in the current investigation from the...     

Self-assembly and potassium ion triggered disruption of peptide-based soft structures

This report describes formation of soft vesicular structures by a tetrapeptide and its disruption triggered by potassium ions.     

Indole-based chemosensor for Hg2+ and Cu2+ ions: applications in molecular switches and live cell imaging

An indole based "ratiometric" and "turn-off" tris(N-methylindolyl)methane based chemosensor depicting a contrasting fluorescent behavior towards Hg(2+) and Cu(2+) ions, exhibited NOR and YES logic functions, and also imaged intracellular Hg(2+) in cervix cancer (HeLa) cells.     

Integrability and <Emphasis Type="Italic">L</Emphasis><Superscript>1</Superscript>-convergence of double cosine trigonometric series

We study here L1-convergence of new modified double cosine trigonometric sum and obtain a new necessary and sufficient condition for L1-convergence of double cosine trigonometric series.Also,the results obtained by Moricz[1],[2] are particular cases of ours.     

Steady state self-focusing, self-modulation of laser beam in an inhomogeneous plasma

Laboratory as well as PIC simulation experiments reveal strong flow of energetic electrons co-moving with laser beam in laser plasma interaction. Equation governing the evolution of complex envelope in slowly varying envelope approximation is nonlinear parabolic equation. Variational approach is used to solve this problem and a Lagrangian for the problem is set up. Assuming a trial Gaussian profile, authors solve the reduced Lagrangian problem for beam width and curvature. Two scale lengths for inhomogenity along the direction of propagation, one for nonlinearity and other for diffraction management are introduced. Self-focusing, self-modulation as well as self-trapping of the laser-electron-beam plasma system is studied under variety of parameters.