A. H. Bhuiyan

Effect of Gamma Radiation on the Mechanical Properties of Urea-Treated Rice Straw Polypropylene Composites

Rice straw (RS) polypropylene (PP) composites were prepared in the different ratios of 10:90, 20:80, 30:70, 40:60 and 50:50 (RS wt% : PP wt%) by extrusion moulding and hot press compression technique and investigated the mechanical properties like tensile strength (TS), bending strength (BS), impact strength (IS) and elongations at break (Eb%) of the composites. RS was soaked in the different ratios of urea solution and it was observed that 1% urea-treated RS content composites exhibited better mechanical properties. Gamma-irradiated RSPP composites showed superior performance. Water uptake and degradation studies of composites were also monitored.

Structural, morphological, optical and electrical properties of spray deposited zinc doped copper oxide thin films

Nanostructured spray deposited zinc (Zn) doped copper oxide (CuO) thin films were characterized by employing X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX), atomic force microscopy (AFM) and ultraviolet–visible–near infrared (UV–Vis–NIR) spectroscopy. XRD patterns of CuO and Zn doped CuO thin films indicated monoclinic structure with the preferred orientation along

IMPROVED PERFORMANCE OF ISOTACTIC POLYPROPYLENE/TITANIUM DIOXIDE COMPOSITES: EFFECT OF PROCESSING CONDITIONS AND FILLER CONTENT

left( {bar 111} right)

Electrical conduction mechanism in plasma polymerized 2-(diethylamino)ethyl methacrylate thin films

1¯11 plane. Maximum value of crystallite size is found about 28.24xa0nm for 5 at% Zn doped CuO thin film. In FESEM images, nanoparticles were observed around the nucleation center. EDX analysis confirms the presence of all component elements in CuO and Zn doped CuO thin films. Analysis by AFM of CuO and Zn doped CuO thin films figured out decrease of surface roughness due to Zn doping. UV–Vis–NIR spectroscopy showed that CuO and Zn doped CuO thin films are highly transparent in the NIR region. Optical band gap of CuO thin films decreased with substrate temperature and that of Zn doped CuO thin films increased with Zn concentration. Refractive index of CuO and Zn doped CuO thin films raised with photon wavelength and became constant in the NIR region. 5 at% Zn doped CuO thin film showed the highest optical conductivity and the lowest electrical resistivity at room temperature.

Charge transport mechanism under applied DC electric field in plasma polymerized diethanolamine thin films prepared by a capacitively coupled reactor

Plasma-polymerized thin films of n-butyl methacrylate (PPnBMA) have been deposited on to glass substrate in an aluminium/PPnBMA/aluminium configuration by a capacitively coupled glow discharge reactor. The field emission scanning electron microscope and atomic force microscope images of PPnBMA thin films showed a flat, uniform and continuous surface. With increasing deposition time the root mean square roughness of the PPnBMA thin films increases. The differential thermal analysis and thermogravimetric analysis demonstrated that PPnBMA was thermally stable up to about 476 and 500K in air and N2 environments, respectively. The alternating current (AC) electrical conductivity (σAC) and dielectric properties of the PPnBMA thin films of thickness 120nm were investigated in the frequency region from 102–106Hz at various temperatures. It was found that the mechanism dependable for the conduction process in PPnBMA is hopping. The trend of dielectric constant ascends with ascending temperature and descends with f...