ORIGINAL_ARTICLE
Assessment of nonlinear optical properties of polyurethane/MgO nanocomposites
The third-order optical nonlinearities of polyurethane open cell (PUOC)/MgOnanocomposites, dissolved in dimethylformamide are characterized by Z-scan technique with continuous-wave (CW) Nd:YAG laser at its second harmonic frequency of 532 nm with TEM00 Gaussian profile. The synthesized samples are also characterized by scanning electron microscopy imaging. The nonlinear refractive indices and nonlinear absorption coefficients of the synthesized samples are obtained in the order of 10-8 cm2/W with negative sign and 10-5 cm2/W, respectively. The origin of optical nonlinearity in this case may be attributed due to the presence of strong saturable absorption effect. All the results suggest that the nonlinear coefficients of the synthesized samples can be controlled by the nanoparticles contents into PUOC. Furthermore, the results show that PUOC/MgO may be helpful candidate for the application in nonlinear optical field in the visible region.
https://etj.uotechnology.edu.iq/article_116637_c920ccacd39c9b771f83c739a17c48e2.pdf
2015-08-01
1175
1178
10.30684/etj.2015.116637
nanopowder
polyurethane
MgO
nonlinear
scan
Marzieh
Nadafan
1
AUTHOR
Rasoul
Malekfar
2
AUTHOR
Zahra
Dehghani
3
AUTHOR
Mohammad
Allahabadi
4
AUTHOR
ORIGINAL_ARTICLE
Enhanced thermal conductivity of cooling liquid using nano material's
In present work alumina with grain size (50nm )and titanium dioxide with grain size (20nm ) are used tothermal conductivity is tested separately when mixed with water at different percent concentrations (0.05%, 0.1 %, 0.3%, and 0.5 W %),in order to investigate their effects on enhancement of heat transfer of pool boiling water and enhancement thermal conductivity of nanofluid. The experimental results of thermal conductivity of water before and after adding of nanoparticles have been presented in this work. The results of a theoretical study of thermal conductivity of nanofluids with Al2O3 and TiO2 nanoparticles are also presented and compared with the experimental results. Both results showed an increment of 1.5% -1.8% enhancementshave been obtained when a small amount of nanoparticles is added to the pure water. The theoretical calculation is based on the mechanism of Brownian motion which is the reason for improvement of thermal conductivity.
https://etj.uotechnology.edu.iq/article_116638_b2e000d9f3eeb6014b58883cdf7388b3.pdf
2015-08-01
1179
1192
10.30684/etj.2015.116638
heat transfer
Nucleate Pool Boiling
thermal conductivity
and TiO
Nanoparticle
nanofluid
base fluid
Kheria
M.Essa
1
AUTHOR
Hashim
Zydan Mohammed
2
AUTHOR
ORIGINAL_ARTICLE
Experimental Stability and Thermal Characteristics Enhancement Analysis of Water Based Boehmite Nano fluid
In this work attempt was made to formulate water based boehmite (AlOOH) nanofluid in one and two steps methods. Boehmite is the first born alumina phase as prepared by sol gel route using aluminum isopropoxide precursor, exhibit a combination of excellent consistency and dispersibility in water. Plain nanofluids containing boehmite at different concentrations were investigated for colloidal, suspensions and/or dispersions stability and thermal conductivity enhancement. X-ray diffraction analysis, laser diffraction particle size analysis, viscosity, thermal conductivity measurements, TG/DSC thermal analysis and sedimentation balance were used as characterization tools. The results show promising long-term fluid stability and thermal conductivity enhancement relative to starting based fluid following non-linear dependence on particles concentration. The maximum 2.7 times enhancement in thermal conductivity occurred at narrow boehmite concentration range as a result of achieving optimum nanoparticles aggregation level where neither the case of nanoparticles homogenous dispersion nor the case of fully aggregated clusters could retain these enhancements values. This far beyond behavior from Maxwell's model was explained on the basis of the known mechanisms of thermal conductivity enhancement of nanofluids.
https://etj.uotechnology.edu.iq/article_116639_ea39e5cb13c52a3e561d019b994226da.pdf
2015-08-01
1193
1210
10.30684/etj.2015.116639
Boehmite
sol
gel
Xerogel
nanofluid
stability
thermal conductivity
alumina
Sedimentation
Mohammed
Hussein J. Al –Atia
1
AUTHOR
Sarah
A. Abed
2
AUTHOR
ORIGINAL_ARTICLE
Enhancement of surface properties for C11000 and 6063Al alloys by using laser shock wave process
The use of a laser to modified the surfaces of various materials engineering is a important topics in the present time. Two types of alloys were used in this investigation; 6063Al and C11000 alloys. Samples were prepared by cutting into disc shape of radius 12 mm and then cleaning and polishing process to produce same surface roughness for all samples . Surface roughness and micro hardness were measured for all samples before and after laser shock wave treatment . different laser parameters effect on alloys surface properties were studied such as laser energy , confinement layer( different depth of DDDW) ,and number of laser pulses . The results reveal that the surface roughness are increased by 200% for 6063Al alloy and by 120% for C11000 alloy when we used laser energy of 400mj , number of laser pulses of 100 and confinement layer 5mm . While the microhardness increase by 80% for the two kinds of alloys and at the same conditions . Different measurements were carried out for all samples such as XRF, EDX, SEM , and different mechanical tests For precise and accurate results.
https://etj.uotechnology.edu.iq/article_116641_5024b110eafea546f4a3b83776b9e00e.pdf
2015-08-01
1211
1219
10.30684/etj.2015.116641
Laser shock wave
Microhardness
Surface Roughness
Abdulhadi
kadhim
1
AUTHOR
Ayad
Z.Mohammed
2
AUTHOR
Haitham
T.Hussein
3
AUTHOR
ORIGINAL_ARTICLE
Preparation, characterization and electrical conductivity of doped polyaniline with (HCL and P-TSA)
Polyaniline (PANI) in Emeraldine salt form was prepared by chemical oxidative polymerization of the appropriate monomeric aniline using two different acid doping (Hydrochloric acid (HCL) and P-Toluene sulfonic Acid (PTSA)) respectively. The prepared samples were characterized by Fourier transform- infrared (FT-IR) spectroscopy; Ultraviolet- Visible (UV-VIS) spectroscopy and X-ray diffraction technique (XRD). The FT-IR and UV-VIS spectroscopy results indicate the doping state of PANi (HCL and PTSA). The crystallinity of the samples was studied in detail by X-ray diffraction technique. The (I-V) characteristic of (PANI) at room temperature, it was showed linear curve close to zero bias indicates that the charge transfer is a straight forward consequence of ohmic behavior, indicating that the measurement was performed in a field independent conductivity region. The scanning electron microscopy (SEM) was used to determine the morphology of the as-prepared nanomaterials.
https://etj.uotechnology.edu.iq/article_116642_3eb33fbe1bb6a37454251cd23a26c257.pdf
2015-08-01
1220
1231
10.30684/etj.2015.116642
Conducting polymer
Polyaniline
Polymerization
doping
Sewench
N. Rafeeq
1
AUTHOR
Wasan
Z.Khalaf
2
AUTHOR
ORIGINAL_ARTICLE
Effect of TiO2 Nanoparticles on Water absorption and shrinkage of the PVA/CS Blend and PVA/CS nanocomposites thick Films
In this paper the effect ofaddition0.2,0.4,0.6,0.8,1gofTitanium oxide (TiO2)Nanoparticles inwater absorption, dimensions change and thickness for Polyvinyl alcohol (PVA)/Corn Starch(CS)10g/10g blend and PVA/CS/TiO2 thick films have been studied. Films were prepared using solution casting method. Films were immersing in water for 60 days. The results show that, the water absorption and dimensions change decrease with increasing nanoparticles content, but thickness increase with increasing nanoparticles after immersion, also weightlosing, dimensions change and thickness were found after drying. The results show that the weightlosing, dimensions change decrease with increasing nanoparticles, reducing in thickness increase with increasing nanoparticles
https://etj.uotechnology.edu.iq/article_116643_26d129c3729b737b097e70ad2ddff1d3.pdf
2015-08-01
1232
1243
10.30684/etj.2015.116643
Biodegradation
absorption
Shrinkage
Blend
film
corn starch
PVA
TiO
WAC
Harith
Ibrahim jaafer
1
AUTHOR
Abeer
Mohamad Abed
2
AUTHOR
ORIGINAL_ARTICLE
Synthesis of Metallic Nanowires Using Hydrothermal Method
Silver nanowire grow on FTO coated quartz substrate by using hydrothermal method, it can be observed that the morphology of the product is wire-like and nearly uniform in width (60 ± 10 nm), while the length is in a relatively broad range (from 0.2 to 4 µm) with an average at 2.5 µm. The calculated lattice constant according to the (111) peak is 4.08 Å which is closely consistent with the standard value (4.086 Å).
https://etj.uotechnology.edu.iq/article_116686_dae49e6f7e0835dec43372ca29cdaac9.pdf
2015-08-01
1244
1247
10.30684/etj.2015.116686
Ag nanowire
SEM
structure properties
Nadheer
Jassim Mohammed
1
AUTHOR
Walid
Ibrahim Hamad
2
AUTHOR
Reem
Sami Ali
3
AUTHOR
Raghad
Saadon Mohammed
4
AUTHOR
Sundus
Yasser Helyel
5
AUTHOR
ORIGINAL_ARTICLE
Nano-SiO2 Addition Effect on Flexural Stress and Hardness of EP/MWCNT
Nano-SiO2 with different weight percentage (1,2 ,3, 4 and 5) % wt. , and 3% MWCNT were usedto fabricate nano-SiO2/MWNT/epoxy composite samples by hand layup method. Ultrasonic mixing processwas used to disperse the nano additives into the resin system. scanning electron microscopy (SEM)where usedto carry out the characteristic of fracture surface. By both the high aspect ratio and the very high modulus ofnano fillers. The mechanical properties of the composite with different weight percentages of nano-SiO2 havebeen investigated and After examine, the Scanning Electron Microscopy (SEM) explains well dispersednanotubes and SiO2 nano particles in the matrix. No evidence of agglomeration of the nanotubes can be foundin this micrographs. By adding SiO2 nano particles to epoxy/MWCNT composite, this would dramaticallyimprove the bending properties and The Young’s modulus has been doubled and quadrupled for compositeswith respectively 2 and 4 wt.% nano SiO2, compared to the pure resin matrix samples (3.36 ,4.06 ,and 1.59 )GPa respectively .While flexural strength has been increased in random manner with maximum value for 2 wt%(111 MPa). The hardness of nano composite increased with increase of SiO2 filler loading, it can be seen thatthe SiO2 filler greatly increased the hardness, which can be attributed to the higher hardness and moreuniform dispersion of SiO2 filler. The higher hardness is exhibited by the 5 wt% SiO2 filled compared to othernanocomposites. The results show that at 5wt% nano SiO2 content there is 11% increase in hardness
https://etj.uotechnology.edu.iq/article_116689_5c854283c9ca63a74aa9c24224b1c79a.pdf
2015-08-01
1248
1257
10.30684/etj.2015.116689
Epoxy resin
Mechanical properties
Nanocomposites
Carbon Nanotube
nano silica
E.A.
Al-Ajaj
1
AUTHOR
A.Sh.
Alguraby
2
AUTHOR
M.K.
Jawad
3
AUTHOR
ORIGINAL_ARTICLE
Absorption coefficient measurement of bremsstrahlung radiation in nano composite
In The present work has been prepare samples of polymer and the formation of composite material at different rates (20%, 50% &70%) of nano lead to clarify the difference in the spectrum absorption bremsstrahlung rays through the process of exponential equations graphic representation of the rate correction as a function of energy within the range (0.1 –1.7) MeV using NaI(Tl) energy selective scintillation counter with 90Sr/90Y negative beta source. It was getting also attenuation coefficient of the prepared samples to the same range of energy through graphic representation of natural allegartm count rate as a function of the thickness of absorbent material as the gradient relationship diagrams represents absorption coefficient. The result shows a directly relationship, between the thickness of the absorbent material and the absorption factor. The result, also show that, a reversal relationship, between the absorption factor and the energy of beta particle. The results shows that , the samples prepared of good absorption for beta particles and absorb bremsstrahlung rays and this efficiency is relatively unchanged according to the proportion of nano lead additives which shows a positive impact of the materials prepared in the process of radiation shielding.
https://etj.uotechnology.edu.iq/article_116691_88204b818355318bc8d6e8611f160b99.pdf
2015-08-01
1258
1266
10.30684/etj.2015.116691
Epoxy
polyurethane
Intensity
Particles range
Absorption coefficient
Noor
M. Aowd
1
AUTHOR
Hayder
S.Hussain
2
AUTHOR
ORIGINAL_ARTICLE
Electrical properties of Nano crystalline ZnxCd1-xS thin films prepared by CBD technique
Nanocrystalline zinc cadmium sulfide (ZnxCd1-xS) thin films were deposited on glass substrate by chemical bath deposition (CBD) technique using the mixed aqueous solution of zinc chloride ((ZnCl2), cadmium chloride (CdCl2), thiourea (CS(NH2)2) and ammonia solution (NH4OH). The as deposited films were characterized by high quality instrument type (HMS-3000). The results show that all the prepared films have n-type conductivity; this is concluded from the Hall measurements. The electrical conductivity is found to decrease with increasing x, while the activation energies are found to be increasing from (0.458 to 0.860 eV) as x increase from ( 0.1to 0.9).
https://etj.uotechnology.edu.iq/article_116692_97db8cd8a53c2732c34372aac8ef538f.pdf
2015-08-01
1267
1272
10.30684/etj.2015.116692
Nanostructures
VI Thin films
Chemical bath deposition technique
Jamal
F. Mohammad
1
AUTHOR
Hamed.
S. Al-jumaili
2
AUTHOR
ORIGINAL_ARTICLE
Aerosol assisted dielectric barrier discharge plasma jet for Silver PMMA nanocomposite thin films preparation
Silver Poly (methyl methacrylate) PMMA nanocomposite thin films deposited on glass substrates by in-situ aerosol assisted plasma polymerization at atmospheric pressure and room temperature, from methyl methacrylate monomer in the presence of different concentrations of Ag nanoparticles (3%, 5%, 7%, and 9wt%). The average particles size for the silver nanoparticles was within 50nm. Metal polymer nanocomposite thin films were characterized by UV-VIS, XRD, and SEM the optical studies show that the energy band gap will be different according to the silver PMMA concentration. The XRD pattern indicates that the pure PMMA is amorphous where The XRD pattern of Ag nanoparticles in PMMA, all the refractions corresponded to the pure silver metal with cubic symmetry. SEM and the XRD reveal the presence of silver nanoparticle embedded into PMMA. It can be concluded that it can be prepared Ag PMMA nanocomposite thin films by aerosol assisted dielectric barrier discharge DBD plasma jet polymerization and control the optical energy band gap irregulars by controlling the experiment variables.
https://etj.uotechnology.edu.iq/article_116694_383a5cac060737eda0587ddbed902856.pdf
2015-08-01
1273
1282
10.30684/etj.2015.116694
PMMA
nanocomposite
plasma jet
Hammad
R. Humud
1
AUTHOR
Lubna
Abd Al Kareem
2
AUTHOR
Abdulhadi
Kadhim
3
AUTHOR
ORIGINAL_ARTICLE
Structural , Morphological and Electrical Properties of AgSbSe2 Thin Films
AgSbSe2thin films with different thicknesses (100,300,500, and 700nm) have been deposited by single source vacuum thermal evaporation onto glass substrates at ambient temperature to study the effect of thickness on its structural morphology, and electrical properties. The X–ray diffraction patterns of AgSbSe2thin film show that with low thickness (t=100,300 and 500nm) have amorphous structure convert to polycrystalline structure with increase thickness to 700 nm..AFM measurements show that the average grain size increases while the average surface roughness decreases with the increase of thickness. The DC conductivity of the vacuum evaporated AgSbSe2thin films was measured in the temperature range (298-473)K and was found to increase on order of magnitude with increase of thickness. The plot of conductivity with reciprocal temperature suggests, there are two activation energies Ea1, andEa2 for AgSbSe2for all and thicknesses which decrease with increasing thickness. The electric carrier concentration and mobility show opposite dependence upon thickness.
https://etj.uotechnology.edu.iq/article_116695_e3bea74a1a5231c014fd0b720c6484f2.pdf
2015-08-01
1283
1289
10.30684/etj.2015.116695
AgSbSe
XRD
Bushra
A.Hasan
1
AUTHOR
Issam
M. Ibrahim
2
AUTHOR
ORIGINAL_ARTICLE
Corrosion Behavior of Friction Stir Process for Al-base Nano Composite Surface Produced by Electrophoretic Deposition
In this study, friction stir method (FSP) was used for include walled (Al2O3) Nano-sized particles into the matrix of Al 5083 alloy by electrophoretic deposition (EPD). The impact of these reinforcements on microstructural modification, mechanical properties and corrosion resistance of FSP Al 5083 surface composites were studied. A rib cylindrical hardened steel tool was used with the rotation speeds of 800, 1000 and 1200 rpm and travel speeds 50 mm/min. Mechanical properties and corrosion resistance of FSP samples were evaluated and compared with the basis alloy. The corrosion behavior of the samples was investigated by potentiostatic polarization tests. Microstructural analysis accomplished by optical and SEM microscopes showed that reinforcements are well distributed within the stir zone, and grain refinement is gained. The reinforcement incremented the hardness from Hv80.083 metric weight unit for as castings to a most of Hv135.413 for friction stir. Although friction stir parameter has attenuated the corrosion current density (7.15μA/cm2) compared to the results of the as-cast samples.
https://etj.uotechnology.edu.iq/article_116696_e886102e58c4f38f4ce48d73e555fec8.pdf
2015-08-01
1290
1302
10.30684/etj.2015.116696
Corrosion behavior of Friction Stir process
Microhardness
EPD
Hussein
A. Hussein
1
AUTHOR
ORIGINAL_ARTICLE
Synthesis of Nano-TiO2 Thin Films by Sol-gel Dip-coating Method
Synthesis of titanium dioxide (TiO2) Thin film on three microscope glasses using sol-gel method has been studied intensively. The starting materials were titanium(III)chloride, Ammonium Hydroxide. The components were mixed together to form the sol. Then, at 50℃ heating and ageing was applied to form stable sol-gel . Every glass substrate dipping in sol-gel beaker for period time (1,3,5)min respectively, for obtaining different thickness films. To evaluate the performance of films, After annealing at 500℃ , the crystallinity of the films was determined by using the x-ray diffractometer (XRD). The change on the surface morphology was observed using Atomic Force Microscope(AFM). Finally, Optical properties measurements Absorbance (A) and transmittance(T)) for (TiO2) films were studied by UV-Visible spectrometer. analysis on the films. It has been successfully shown that the anatase crystalline phase was observed when the TiO2 thin film was annealing at 500°C. The roughness and the crystalline size of TiO2 thin film changed with the thickness. The minimum grain size( 6.92) nm for thickness 1.2µm UV-visible studying that absorption is maximum at UV spectrum (opaque) and the transmittance is maximum at the visible spectrum
https://etj.uotechnology.edu.iq/article_116698_1b6a9eb43b35b9d1ab126db17fb95e67.pdf
2015-08-01
1303
1312
10.30684/etj.2015.116698
sol
gel
TiO
Structural properties
Optical properties
Surface morphology
Bushra
R. Mahdi
1
AUTHOR
Abass
F. Al.mamori
2
AUTHOR
Adnan
meship Mahdi
3
AUTHOR
ORIGINAL_ARTICLE
Study the erosion resistance of hybrid particulate composites
In this work a hybrid composite materials were prepared containing matrix of polymer blend (Novolac 80% + Epoxy 20%) reinforced by different reinforcing materials (Alumina Powder + Silica Powder + Asbestos short fiber ) with two values of volume fraction (30, 40) %.The hybrid composite materials prepared are:• H1 = Blend + Al2O3 + AS (30) %• H2 = Blend + SiO2 + AS (30) %• H3 = Blend + Al2O3 + SiO2+ AS (30) %• H4 = Blend + Al2O3 + AS (40) %• H5 = Blend + SiO2 + AS (40) %• H6 = Blend + Al2O3 + SiO2+ AS (40) %Oxy - Acetylene was used to examine erosion .The sample (H6) of the volume fraction (40%) showed higher erosion resistance values whereas the sample (H1) was less in value to resist erosion, the highest rates of erosion. For the (H1) sample there was high tendency to weight loss with high temperature and less as to the sample (H6).
https://etj.uotechnology.edu.iq/article_116700_c1c04b6b177ee05bf96e345479937ecd.pdf
2015-08-01
1313
1318
10.30684/etj.2015.116700
Ali
Hassan.R.H Al-Azzawi
1
AUTHOR
ORIGINAL_ARTICLE
Study The Convective Heat Transfer of TiO2 /Water Nanofluid in Heat Exchanger System
The enhancements of heat transfer coefficient and Nusselt number in a heat exchanger system were achieved by using Titanium-dioxide (TiO2) nanoparticles with an average diameter of 10 nm. TiO2 nanoparticles/water has a better thermal conductivity compared to conventional working fluids (water). The heat transfer rate in a vertical shell and tube heat exchanger counter flow under laminar and turbulent flow conditions were investigated. The liquid flow rate has been varied in the range of 50-300 l/h whilethe inlet temperature was between 20 to 60ºC. The effects of factors such as the Reynolds number and the peclet number on the heat transfer and flow characteristics were carried out and investigated. It was observed that the convection heat transfer increased remarkably with the increment of the temperature under various values of the Reynolds number.As well as,the Nusselt number increased about 17% as compared to pure water;at a nanofluid velocity of 0.0192 m/s at inlet temperature of 600C.
https://etj.uotechnology.edu.iq/article_116701_27925fb46b7b499f7fa7d88f3ff27434.pdf
2015-08-01
1319
1329
10.30684/etj.2015.116701
Nanofluids
thermal conductivity
Viscosity
TiO
Asmaa
H. Dhiaa
1
AUTHOR
Majid
I. Abdulwahab
2
AUTHOR
S.M.
Thahab
3
AUTHOR
ORIGINAL_ARTICLE
Study some thermal properties for hybrid composite reinforced with particales
In this work a hybrid composite materials were prepared containing matrix of polymer blend (Novolac 80% + Epoxy 20%) reinforced by different reinforcing materials (Alumina Powder (type α) + Silica Powder + Asbestos short fiber) with two values of volume fraction (30, 40) %.The hybrid composite materials prepared are:• H1 = Blend + Al2O3(α ) + AS (30) %• H2 = Blend + SiO2 + AS (30) %• H3 = Blend + Al2O3 (α ) + SiO2+ AS (30) %• H4 = Blend + Al2O3(α ) + AS (40) %• H5 = Blend + SiO2 + AS (40) %• H6 = Blend + Al2O3(α ) + SiO2+ AS (40) %All samples related to mechanical, thermal, electrical and physical tests were prepar by hand lay up process. The tests can be classifi into four groups: For the (H1) samples, there was high tendency to loose weight with high temperature and less as to the samples (H6).
https://etj.uotechnology.edu.iq/article_116702_644c7f62f765a01369f0c52e929512b4.pdf
2015-08-01
1330
1336
10.30684/etj.2015.116702
Themogravimetric analysis
alumina
Silica
asbestos short fiber
Ali
Hassan R.Al-Azzawi
1
AUTHOR
Balkees
M. D.AL-Dabbagh
2
AUTHOR
Sana
Ali .j
3
AUTHOR
ORIGINAL_ARTICLE
Water Absorption of HDPE/Al2O3,TiO2 Composites
The water absorption of high density polyethylene filled with micro hybrid (titanium dioxide and alumina), alumina and titanium dioxide with weight ratio of 15%, 20%, 25% and 30% , are measured in order to study the effect of these particles on water absorption of this polymer. The result shows that the increase of content of filler particles increasing water absorption, because of filler particles which have a higher water absorption percentage than the matrix material, and the filler will take up the free volume within the polymer matrix and create a tortuous path for the water permeating through the sample.
https://etj.uotechnology.edu.iq/article_116703_70cdfc6cd722002d770e84370280fe90.pdf
2015-08-01
1337
1347
10.30684/etj.2015.116703
Water absorption
HDPE
composites
Biomaterial
Harith
I. Jaffer
1
AUTHOR
Z.
R. Al-Shammary
2
AUTHOR
Ali
A. Abbas
3
AUTHOR
Ali
Qassim
4
AUTHOR
ORIGINAL_ARTICLE
Evaluation Mechanical Properties of Polymer Composites Reinforced by different Metal Powders
This research covers reinforcement of unsaturated polyester resin by metal powders, and studying some of their mechanical properties. The samples were prepared by hand lay-out technique. The unsaturated polyester resin was reinforced by two types of metal powders Copper (15.598 µm) and aluminum (21.533µm) at selected volume fraction of (0, 5, 10. 15, 20 and 25 %). The study of mechanical properties includes tensile properties (strength at fracture point, elastic modulus and elongation at at break), flexural strength and flexural modulus, impact properties and hardness. The results show a noticeable increase in values of tensile strength at fracture point and tensile modules of elasticity, as the volume fraction of metal powder increase and reach to maximum value at 15 % volume ratio for both types, where as flexural strength, flexural modulus and fracture toughness reach to maximum value at 10 %volume ratio for both types composites, however elongation at break shows decrement as the volume fraction of metal powder is increased for both types composites.
https://etj.uotechnology.edu.iq/article_116706_b5dabb33fc1fa8e92ce9343fcaeb7009.pdf
2015-08-01
1348
1360
10.30684/etj.2015.116706
composites
Mechanical properties
metal reinforcement
Sihama
Issa Salih
1
AUTHOR
Safaa
Nayyef
2
AUTHOR
Alyaa
H .Abd Alsalam
3
AUTHOR
Ammar
Mousa Hasan
4
AUTHOR
ORIGINAL_ARTICLE
Synthesis of Silver Nanoparticles by Electrochemical Method
In this present study, we present a method for the preparation of electrochemical silver nanoparticles.we employed two electrodes of pure silver with length 8-12 cm, thickness of 0.4 mm and width 8-10 mm inside a container full of DDDW with distance 10 mm between them and with potential difference about 27 volt.For the purpose of analyzing of optical, structural and morphological properties of the surface that describe the nature, the charging and the voltages of these materials by using the UV-VIS, X-ray, Z-potential, SEM, AFM, and TEM were employed.Size and properties werecontrolled in high concentrations with good stability for long period without aggregation. Colloidal silver-NPs with grain size of 30-50 nm had beenproduced at optimum conditions.
https://etj.uotechnology.edu.iq/article_116707_8fbe81a80cb5d51978ec49537f5d6644.pdf
2015-08-01
1361
1373
10.30684/etj.2015.116707
silver nanoparticles
electrochemical
colloidal
Mohammed
J. Haider
1
AUTHOR
Mohammed
S. Mahdi
2
AUTHOR