Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Nano


Study the Effects of Nano-Materials Addition on Some Mechanical Properties of Cement Mortar

F.A. Rasin; L.K. Abbas; M.J. Kadhim

Engineering and Technology Journal, 2017, Volume 35, Issue 4, Pages 348-355

This research involves nano-materials addition and interaction with cement mortar behavior for many mortar samples under variable curing time with constant water to cement ratio (W/C = 0.5). Some mechanical properties such as (compressive and flexural strength tests), durability (by water absorption test) were studied. The effect on the (Al-Mass cement) Ordinary Portland Cement (OPC) type (I) by additives with small amounts of nano-particles (SiO2) and (Al2O3) were investigated in this research. The nano materials additives were added on the mixture of mortar with the percentages (1, 2, 3, 4 and 5%) for both nano materials with constant (W/C) ratio and also the amount of the fine aggregate used three times the amount of cement. The results shows that, the strength of the mortar consist both nano materials give better properties than mortar without nano materials in all tests. But nano silica additive gives good properties up to (3%) than mortar with nano alumina additive which give proprietress up to (2%).

Preparation of NanostructureTiO2 at Different Temperatures by Pulsed Laser Deposition as Solar Cell

Amin Daway Thamir; Adawiya J. Haider; Ghalib A.Ali

Engineering and Technology Journal, 2016, Volume 34, Issue 2, Pages 193-204

Deposition of the Titanium oxide (TiO2) particles on glass and the Si substrates was materialized for a wide range of temperatures (100-400)°C; using PLD technique at constant laser energy 800 mJ of frequency doubled Nd: YAG laser wavelength of 532nm running at 10 Hz rate and 10ns duration pulses. UV-Vis spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), X-ray fluorescence (XRF), Scanning Electron Microscopy (SEM), Atomic Force Microscope(AFM), electrical conductivity (σdc), Hall coefficient (RH) and (I-V) and (C-V) measurements were employed to examine optical, morphological and electrical properties of the deposited films. 85% film transparency was accomplished with optical band gap of (3.25 – 3.64) eV.(I-V) characteristics showedan enhanced TiO2 p-n junction thin film solar cell efficiency by 1.6% at 400°C.

An Investigation of Germanium Properties Prepared by Laser Ablation in Liquid

Iman H. Hadi

Engineering and Technology Journal, 2015, Volume 33, Issue 8, Pages 1467-1472

In this work, fabrication and characterization of germanium (Ge) NP is presented. The germanium particles were prepared by pulsed laser ablation in liquid technique (PLAL) at different laser fluenceusing Q-switched Nd:YAG laser at (1.06 µm) laser wavelength with pulsewidth 10 ns .Atomic Force Microscopy(AFM) and Energy Dispersive Analysis of X-rays (EDAX) are utilized here to study the surface and sizes of Ge nanoparticles and the evidences for ablation of materials respectively and the spectrophotometer have been used to characterize the optical properties of the prepared nanoparticles.

Fabrication nano fiber optic by chemical etching for sensing application

Radhi M. Chyad; Mohd Zubir Mat Jafri; Kamar ulazizi Ibrahim

Engineering and Technology Journal, 2015, Volume 33, Issue 6, Pages 994-1002

Recently, emerged an easy way to fabricate to a nano fiber-optic sensor (NFOS) using the inscription on the silica fiber. A simple etching reactor was developing to obtain reproducible tapers of desired diameter and length. This approach is reflected on-line monitoring of the etching using the transmitter and receiver system. The experimental data indicate that the diameter of the optical fiber decreases linearly with the time of survival of hydrofluoric acid, and etching was used at room temperature. In this study, we were examined the best rate of etching that used for the fabrication of such sensors. In the aforementioned technique, this method aims to determine the diameter of the reduced core and show the evolution of the two different processes from the nano fiber regime to the fixed regime in which the mode was remote from the surrounding evanescent field, intensity can propagate outside the segment fiber when the core diameter is less than 100 nm. To expire a easy-going has developed the diameter of the fibre after etching to the process has been done successfully.