Physics

The theoretical ultrasonic velocity in ternary mixtures of amide in benzene with amines at 303K have been evaluated by using theoretical models of liquid mixtures such as, Nomoto's relation, Free Length Theory, Ideal mixture relation, Junjie's method, Impedance dependence relation and Rao's relation. Ultrasonic velocity of these mixtures has been measured as a function of mole fraction and the experimental values are compared with theoretical values. The results are interpreted in terms of percentage deviation and intermolecular associations between the component molecules in the form of Hydrogen bonding.

The theoretical ultrasonic velocity in ternary mixtures of amide in benzene with amines at 303K have been evaluated by using theoretical models of liquid mixtures such· as, Nomoto's relation, Free Length Theory, Ideal mixture relation, Junjie's method, Impedance dependence relation and Rao' s relation. Ultrasonic velocity of these mixtures has been measured as a function of mole fraction and the experimental values are compared with theoretical values. The results are interpreted in terms of percentage deviation and intermolecular associations between the component molecules in the form of Hydrogen bonding.

Tl1e ultrasonic velocity (U), density (p) and viscosity (ri) measurements l1ave been carried out for three a1nino acids na1nely L-proline, L-glyline and L­alanine in aqueous 2-1netl1oxyethanol as a function of composition at . 303k.Experi111ental data l1ave been used to estimate the adiabatic compressibility (􀀑), Change in adiabatic co1npressibility (􀃡􀀑), relative change in adiabatic compressibility
(􀃧13/130), apparent 1110al co1npressibility (v-Apparent molal volume. The
results are discussed in terms of structure-making or structure-breaking effects of amino acids in tl1e mixture

The ultrasonic velocity, density and viscosity have been measured tor the ternary mixtures 4-Alkoxy benzoic acid with Methacrylate in l, 4-Dioxane at 303, 313 and 323K. The experimental data have been used to calculate the acoustical parameters namely adiabatic compressibility (B), free length (Lf), free volume (Vf) internal pressure (pi;) viscous relaxation time (t) and Acoustic impedance (Z) From the obtained values, molecular interactions have been found through Hydrogen bonding between solute and Solvent liquid mixtures

Nanomaterials based on hydroxyapatite (HA) are well synthesized in the traditional mode using reagents, are not ecological friendly and are of very expensive one. Since current research areas are well focused on the production/synthesis of nanomaterials using an environmental friendly approach, the synthesis of green HA using plant extracts is of paramount importance. In this context, this work is carried out for the chemical and green synthesis of HA and GHA nanorods, from egg shells and Melia dubia as well as for the characterization of their structural, morphological, thermal, optical XRD, EDAX, SEM, and FT-IR analysis as well as in mechano and in influx for filter uses. Antimicrobial properties of these nanorods are evaluated. GHA nanorods are made using the herb Melia dubia. HA and GHA are evaluated for antimicrobial properties against Staphylococcus aureus,Enterococcus faecalis, Proteus vulgaris and Escherichia coli. The results showed that GHA exhibits a strong antibacterial effect against all bacteria studied. GHA nanoparticles can be used for various applications due to their environmental friendliness, non-toxicity and compatibility in bio and especially in tribological and electronics.

ABSTRACT In this study nanofibres of ZnO were fabricated by Electrospinning method at three different temperatures. The solution contains ZnO precursor, Polyvinylpyrrolidone, and solvent. The polymeric components of nano�¯�¬ï¿½bers were completely decomposed due to the calcinations process. If the annealing temperature increased from 600���°C to 800���°C, the crystallinity of ZnO nano�¯�¬ï¿½bers increased and the diameter of nanofibres decreases. This will experimentally proved at temperature of 800���°C. The annealed ZnO/polyvinylpyrrolidone composite �¯�¬ï¿½bers were morphologically and structurally characterized by X-ray diffraction analyses, Scanning electron microscopy, FTIR and UV- optical characterization. These results are reported and discussed here.
Keywords: Semiconductor, ZnO Electrospinning, Temperature dependence, XRD,SEM,FTIR,UV

An electro spinning process was used to fabricate silk broin (SF) Nano ber nonwovens for wound dressing applications.
The electrospinning of regenerated SF was performed with formic acid as a spinning solvent. The morphology,
conformational l structures of SF with herb extract nanobers were investigated by scanning electron microscopy (SEM),
Energy dispersive X-ray spectroscopy (EDAX), Fourier transforms infrared spectroscopy (FT-IR), SEM micrograph
showed that the electrospun SF nanobers had an average diameter of 80nm and a distribution in diameter ranging
from 30 to 120nm.

Nano-sized iron oxide powder particle with uniform particle size by template free method and with biopolymer template method were synthesized and subjected to various studies. The X-ray diffraction and infra-red spectra of prepared Iron oxide were analysed and compared with reported data. The distinct peaks visible at low diffraction angles are similar to the traces reported earlier confirms its presence of iron oxide Nano crystallites in the prepared samples. We have further studied the formation of iron oxide in the presence of polysaccharide templates like starch, glucose, sucrose and subsequently analysed the result.

6-Chloro-2-(4-Aminophenyl)-1H-Benzimidazole compound were synthesized and characterized by SC-XRD, FT-IR, FT-Raman, UV–Vis, 1H NMR, and 13C NMR and analyzed with experimental data. The stable conformer, optimized structure, geometry parameters, and wavenumbers of the title compound were calculated using the DFT approach with the B3LYP functional and 6–311++G(d,p) basis set. Electronic absorption spectra and 1H – 13C NMR studies have been computed in gas and solvents (dimethylsulfoxide, chloroform, and H2O) by using the TD-DFT and the IEFPCM solvation model. The HOMO-LUMO energy band gap has also been determined. To identify the electron localization density and weak interactions, the Multiwin-3.8 was subjected to a topological analysis and non-covalent interactions, including ELF, LOL, DORI and ED. Studies of donor–acceptor connections were performed using NBO …

Dielectric investigations of hydrogen bonded complexes of Enanthamide and Valeramide with 4-bromophenol, 4-chlorophenol, 4-iodophenol and 4-fluorophenol in benzene were done at 303K, using a J-band (7.22GHz) microwave bench and dielectric relaxation setup. The permittivity of amides with halogenated phenol binary mixtures was measured in the microwave frequency range at temperatures ranging from 298K to 323K. At microwave frequencies; dielectric relaxation of ternary mixes of polar liquids in nonpolar fluids has been explored. Such investigations give useful information about the intermolecular and intramolecular interactions of solutes and solvent molecules. The dipole meter had a measurement frequency of 2MHz. The different parameters of dielectric, relaxation time (τ0 ) and the dipole moment (μ) has been evaluated using the single-frequency concentration Higasi approach. The fact that the relaxation time and molar free energy activation of the 1:1 molar ratio are greater than those of other higher molar ratios (i.e. 3:1, 2:1, 1:2, 1:3) confirms the presence of a 1:1 complex structure between the studied systems, as well as a complex formation between the free hydroxyl group of phenols and the carbonyl group of amides. The dielectric relaxation energy parameters (ΔFε, ΔHε and ΔSε) of amides with halogenated phenols in benzene have been computed and compared with the related viscosity parameters. A comparison of these two sets of characteristics reveals that dielectric relaxation, like viscous flow, may be thought of as rate process.

We report the effects of Fe doping on GaN with different concentrations synthesized by the sol-gel method. Crystalline quality and phase purity are characterized by X-ray diffraction. There is no deductible second phase up to 3% Fe-doped GaN and higher dopant concentration shows degradation in crystal quality with other phase formation. The morphological studies showed a walnut-shaped structure with different sizes up to 3% Fe dopant and the charged surface was observed in 5% due to agglomeration of Fe atoms in GaN, which is consistent with the XRD. The magnetic measurement revealed that up to 3% Fe-doped GaN were ferromagnetic at room temperature, whereas for 5% Fe-doped GaN, magnetization may arise due to dopant cluster; thus, lower percentage of Fe in GaN is suitable for DMS.

Growth of GaN fibers by facile electrospinning method and the effect of precursor concentration on structural and optical properties have been reported. X-ray diffraction confirms the wurtzite structure of the synthesized GaN nanofibers. SEM images shows the length and diameter of the fibers increased as the precursor concentration increases. High resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) confirmed the crystalline nature of wurtzite GaN nanofibers. Optical properties were also investigated using diffuse reflectance spectroscopy (DRS) and photoluminescence, which shows the optical band gaps of the grown GaN nanofibers is 3.28 eV. This work confirms the precursor concentrations play a key role on the structural, morphological and optical properties of synthesized GaN nanofibers.

Structural study of synthesized ZnO by electrospinning method at different temperatures

Structural and Optical properties of Fe doped Gallium Nitride by sol-gel Method

GaN nanostructures were synthesized using different mole concentration of precursor composing of gallium nitrate and PVP by sol-gel method. The structural analysis using X-ray diffraction shows the wurtzite form of GaN nanostructure, also it observed that the concentration of precursor play a vital role in structural quality as FWHM increase for higher concentration. From the SEM image it observed that for 0.25 and 0.5 M concentration the honey bee and nanorod structure were obtained. The micro-Raman analysis shows a strong E2H peak of GaN nanostructure.

GaN has been grown by varying precursor concentrations using the sol-gel technique. The influence of varying concentrations on structural, morphological, and optical characteristics was studied. X-ray diffraction and Transmission Electron Microscopy shows the wurtzite structure and highly crystalline nature of the GaN nanostructure. SEM image shows the hexagonal structure for lower concentrations and nanorod for 1M concentration. The photoluminescence study shows the optical band gap of 3.3 eV to the grown GaN nanostructure.