Papers by Assist prof.dr.Olfat A H M A D Mahmood
In this paper, Samples of two types of thermosetting polymeric-based nanocomposites are prepared ... more In this paper, Samples of two types of thermosetting polymeric-based nanocomposites are prepared (Unsaturated Polymer Resin). The base material for these compounds is (poly metheyl metha acrylate) PMMA resin. Because two sets of nanomaterial-supported complexes were prepared separately, it has a viscous liquid state. The first group's samples (PmmaZrO2) were polymerizations of polymethyl methacrylate fortified with minutes of zirconium oxide nanoparticles (ZrO2), while the second group's samples (pmmaMWCNTs) were polymerizations of polymethyl methacrylate supported with Multiwall Carbon nanotubes (MWCNTs). In addition to the pure polymer sample (Pmma) without any addition, the consolidation process for both groups was done with nanomaterials with hardening hardener and polymer to obtain the supported test samples. Our research included the effects of the selected Volume Fractions ratios for each nanomaterials of them, which are as follows :
Journal of optics/Journal of optics (New Delhi. Print), Mar 27, 2024
IOP Conference Series: Materials Science and Engineering, 2021
Different types of long and short multiwalled carbon nanotubes (MWCNTs) were used as structural s... more Different types of long and short multiwalled carbon nanotubes (MWCNTs) were used as structural support in epoxy resin with a percentage of weight (0.1,0.2,0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,4.5,&5) wt. percent, Utilization of direct mixing processes to prepare Nano-Composites (Epoxy/MWCNTs). The ultrasonic mixing method has been used to disperse the nanotubes into the epoxy resin system. SEM was used to demonstrate the dispersion in the epoxy polymer matrix of different MWCNT concentrations. The findings show that electrical conductivity properties boost effect, thermal conductivity coefficient, and A.C with percentage enhancement of less than 2 percent, and then raising with further raise in the content of MWCNTs.
Diyala Journal For Pure Science, 2021
Diyala Journal For Pure Science, 2017
In this research, it has been investigated the effect of addition High performance polymer Polyte... more In this research, it has been investigated the effect of addition High performance polymer Polytetrafluroethylene (PTFE) on the Ultra-high molecular weight polyethylene (UHMWPE) mechanical and physical properties. It has been prepared three types of blends (95:5, 90:10 and 85:15) of UHMWPE: PTFE by compression method. Stress-Strain curves of polymer blends have been showed that higher ultimate strength and Young modulus were at 95:5 and decreased gradually as wt. % PTFE increased. FTIR inspection has been also accomplished. Finally SEM results showed incompatibility between the polymers with presence of boundaries between the binary polymers phases.
Journal of University of Babylon, 2017
Hand lay-up technique was used to prepare sheets of epoxy composites reinforced with two types of... more Hand lay-up technique was used to prepare sheets of epoxy composites reinforced with two types of glass fibers (random, bidirectional and with the two types of glass fibers as a sandwich), the number of glass fibers was 1, 2 and 3 layers with volume fraction 25%. Thermal conductivity results of epoxy composite increases with increasing glass fiber layers, whereas thermal conductivity results of the epoxy composites reinforced with random glass fibers show lower values of thermal conductivity than other two composites in relative. The glass fibers orientation for glass fibers important role of effect in transferring the thermal flux through the fibers as it increases in general for the three types with increasing the number of glass fibers layers in various percentages according to the direction of the thermal flux through the fibers. Hardness (shore D) tests results of epoxy composite increases with increasing glass fiber layers.
Design Engineering, Jul 9, 2021
Physical Review Letters, Oct 5, 2018
We consider the deformation of a thin elastic sheet which is stiff in traction but very soft in c... more We consider the deformation of a thin elastic sheet which is stiff in traction but very soft in compression, as happens in presence of wrinkling. We use the tension-field material model and explore numerically the response of a thin sheet containing multiple cracks of different geometries, when subjected to applied tension. With a single crack, the stress concentrates along a St-Andrew's cross-shaped pattern, whose branches extend from the crack tips to the corners of the domain; at a (small) distance r from the crack tip, the stress displays the usual r −1/2 stress singularity but with an unusual and non-universal angular dependence. A strong interaction between multiple cracks is reported and discussed: in particular, for certain configurations of the cracks, the tensile stiffness of a cracked sheet can be zero even though the sheet is made up of a single component.
Journal of University of Babylon, 2017
Hand lay-up technique was used to prepare sheets of epoxy composites reinforced with two types of... more Hand lay-up technique was used to prepare sheets of epoxy composites reinforced with two types of glass fibers (random, bidirectional and with the two types of glass fibers as a sandwich), the number of glass fibers was 1, 2 and 3 layers with volume fraction 25%. Thermal conductivity results of epoxy composite increases with increasing glass fiber layers, whereas thermal conductivity results of the epoxy composites reinforced with random glass fibers show lower values of thermal conductivity than other two composites in relative. The glass fibers orientation for glass fibers important role of effect in transferring the thermal flux through the fibers as it increases in general for the three types with increasing the number of glass fibers layers in various percentages according to the direction of the thermal flux through the fibers. Hardness (shore D) tests results of epoxy composite increases with increasing glass fiber layers.
The Titanium dioxide (TiO2) Nano-particles (NPs) is synthesized via the Sol -gel method by using ... more The Titanium dioxide (TiO2) Nano-particles (NPs) is synthesized via the Sol -gel method by using titanium tetrachloride (TiCl4) as a starting material while varying the applied temperature in the range of (400-900)oC. The main features of the synthesized NPs have been examined by using X ray diffraction (XRD), Field Emission Electrons Microscopy FESEM and Transmission Electron Microscopy (TEM). The main test of TiO2 NPs was carried out as an antimicrobial and antibacterial agent utilizing four types of bacteria strains (Pseudomonas aeruginosa) and Portus. Results of XRD show that the Titanium dioxide structure demonstrate an Anatase phase at (400 and 450)oC as well as the rutile phase at 900oC. The size of particles is found to be in the range of (15-20) nm for Anatase and for the rutile is in the range of (40-60) nm. FESEM results show the form was crystalline and appeared in the form of cauliflower or clusters for Nanoparticles. The antimicrobial agents can be utilized by the two ...
In this paper, the additive effect of (titanium oxide TiO2 and zinc oxide Zn O) nanoparticles to ... more In this paper, the additive effect of (titanium oxide TiO2 and zinc oxide Zn O) nanoparticles to the epoxy resin as a matrix have been studied, In addition to the manufacturing of hybrid compounds from the same nanoparticles which are (TiO2 / Zn O) depending on the epoxy also as a base material. The hand lay-up method is using to manufacturing the composites from the epoxy resin and nanoparticles with different weight ratios (0.2,0.4,0.6,0.8,1) wt%, Impact Strength test and Compression Strength test and the thermal have been done of all prepared composites. FE(SEM) was used to study the composition of the nanoparticles used in this research, which are titanium oxide and zinc oxide The results of the tests showed that adding the aforementioned ceramic powders improved the mechanical properties of the composite materials the nano composite (EP+ZnO) had highest Impact Strength (0.8 wt%) and highest Compression Strength , the hybrid (EP+TiO2 /ZnO) compound had the highest Impact Strength on (0.8wt %) and highest Compression Strength on the ratio(1wt%) followed by (EP+TiO2) composite had highest Impact Strength on the ratio (0.6wt%) and highest Compression Strength on (1wt%). The results showed that the differential scanning calorimetric (DSC) test has showed that the glass transition temperature of all epoxy composites increases at all weight ratios of reinforcement materials compared with pure epoxy and the high test value of glass transition temperature (Tg) is to the composite composite (EP+TiO2) that equal (67 o C) in the ratio (0.6wt%) , as well as, the crystalline melting temperature of all epoxy composite has showed atypical behavior compared with pure epoxy by increasing the weight concentration.And the results of FE(SEM) showed that Morphology of Zinc Oxide and Titanium Oxide Nanoparticles nearly spherical .
The titanium oxide (TiO2) nanoparticles were prepared using the sol-gel technique. The calcinatio... more The titanium oxide (TiO2) nanoparticles were prepared using the sol-gel technique. The calcination temperature (650, 850) ∁ ° has produced the different TiO2 structures (anatase and rutile), and the effect of the calcination temperature of particles was studied. (TiO2) on the structural properties of the prepared nanomaterial. Furthermore, at room-temperature casting process was used to create a PVA/TiO2 nanocomposite with different TiO2 phases. showed the results of X-ray diffraction (XRD) that a qualitative tetragonal crystal structure (antase, rutile) and scanning electron microscopy FE-SEM used to confirm the microstructure of TiO2 nanoparticles and the effect of each of the calcinations (650, 850) and weight percentages (0.2, 0.4, 0.6, 0.8, 1 wt%) from titanium dioxide nanoparticles on electrical properties of the prepared polymeric (PVA) films. The A. C. conductivity, dielectric constant, and the influence of frequency on the value of A. C. conductivity have been investigated. The results of the electrical properties of alternate current have shown that the dielectric constant decreases with increasing the frequency of the applied field and that alternative conductivity and dielectric constantincrease by increasing the concentration of the nanoparticle.
In this work, we successfully prepared single wall carbon nanotubes (SWCNTs) / Epoxy polymer nano... more In this work, we successfully prepared single wall carbon nanotubes (SWCNTs) / Epoxy polymer nanocomposites with different volume fraction ratios of SWCNTs (0, 0.2, 0.4, 0.6, 0.8, 1, and 1.5%) using mixing method in order to examine and study some of their mechanical properties (impact strength, hardness, creep). The Creep test result showed that the creep rate decreases gradually as the weight ratio of the SWCNTs reinforcement material increases in polymer. Impact strength and hardness values of samples were increased by increasing volume fraction of SWCNT reinforcement material in polymer compared with pure epoxy.
In this study the magnetic nanoparticles of Co1-XZnXFe2O4 were prepared with different X values (... more In this study the magnetic nanoparticles of Co1-XZnXFe2O4 were prepared with different X values (X = 0, 0.1, 0.3, 0.5, 0.7 and 0.9 respectively), using co-precipitation method. The ferrites with a Nano scale was ranging from (10 to28 nm), and the structural properties were tasted prepared samples using X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). The structural results showed that the particles have a cubic spindle phase and that the particles have a Nano scale, with a clear agglomeration between the particles sites Finally, the magnetic properties tests showed that the particles have high magnetic saturation.
The Titanium dioxide (TiO2) Nano-particles (NPs) is synthesized via the Sol-gel method by using t... more The Titanium dioxide (TiO2) Nano-particles (NPs) is synthesized via the Sol-gel method by using titanium tetrachloride (TiCl4) as a starting material while varying the applied temperature in the range of (400-900)ᵒC. The main features of the synthesized NPs have been examined by using X-ray diffraction (XRD), Field Emission Electrons Microscopy FESEM and Transmission Electron Microscopy (TEM). The main test of TiO2 NPs was carried out as an antimicrobial and antibacterial agent utilizing four types of bacteria strains (Pseudomonas aeruginosa) and Portus. Results of XRD show that the Titanium dioxide structure demonstrate an Anatase phase at (400 and 450)ᵒC as well as the rutile phase at 900ᵒC. The size of particles is found to be in the range of (15-20) nm for Anatase and for the rutile is in the range of (40-60) nm. FESEM results show the form was crystalline and appeared in the form of cauliflower or clusters for Nanoparticles. The antimicrobial agents can be utilized by the two phases of TiO2 for two types of bacteria (Pseudomonas aeruginosa) and Portus. The obtained results demonstrate that TiO2 in anatase or rutile phases is effective as anti-bacterial agents.
In this paper, Samples of two types of thermosetting polymeric-based nanocomposites are prepared ... more In this paper, Samples of two types of thermosetting polymeric-based nanocomposites are prepared (Unsaturated Polymer Resin). The base material for these compounds is (poly metheyl metha acrylate) PMMA resin. Because two sets of nanomaterial-supported complexes were prepared separately, it has a viscous liquid state. The first group's samples (PmmaZrO2) were polymerizations of polymethyl methacrylate fortified with minutes of zirconium oxide nanoparticles (ZrO2), while the second group's samples (pmmaMWCNTs) were polymerizations of polymethyl methacrylate supported with Multiwall Carbon nanotubes (MWCNTs). In addition to the pure polymer sample (Pmma) without any addition, the consolidation process for both groups was done with nanomaterials with hardening hardener and polymer to obtain the supported test samples. Our research included the effects of the selected Volume Fractions ratios for each nanomaterials of them, which are as follows :
X-type barium hexaferrite having the formula Ba2Mg2Fe28O46 (Mg2X) were prepared by sol-gel autoco... more X-type barium hexaferrite having the formula Ba2Mg2Fe28O46 (Mg2X) were prepared by sol-gel autocombustion method. The combusted powder calcined at different temperature for one hour. The effects of the annealing temperature on the structural, magnetic and electrical properties of the samples studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), vibrating sample magnetometry (VSM) and LCR-meter. XRD results confirmed the formation of X-type barium hexaferrite with presence of secondary phases such as M and W phases at 1200°C and 1250°C but, single phase of X-type at 1300°C. Avearage crystallite size calculated by Scherer formula and showed it is equal 43.397 nm at 1300°C. FESEM images show platelet-like particles for X-type with average grain size about 1.154μm. Hysteresis loop measurements showed the values of the saturation magnetizations, remanence and coercivity at 1300°C about 50.656 emu/g, 18.416 emu/g and 505.330 Oe respectively. The dielectric constant, tangent loss and ac conductivity calculated as a function of frequency in the range of 100Hz to 3MHz for the samples sintered at 1200°C, 1250°C and 1300°C and showed that the dielectric parameters decrease with increasing frequency and increase with increasing temperature but the ac conductivity increases with increasing frequency and temperature and showed semiconducting like behavior with increasing temperature. Then concludes that high dielectric parameters and coercivity about 505.330 Oe at 1300°C made this material used in the fabrication of multilayer chip inductors (MLCI's) circuits.
View the article online for updates and enhancements. You may also like NCA cathode material: syn... more View the article online for updates and enhancements. You may also like NCA cathode material: synthesis methods and performance enhancement efforts Agus Purwanto, Cornelius Satria Yudha, U Ubaidillah et al.-Controlling the size and magnetic properties of nano CoFe 2 O 4 by microwave assisted co-precipitation method T Prabhakaran, R V Mangalaraja and Juliano C Denardin-Purification processes of cadmium based quantum dots in aqueous medium: a comparative study Dimitri Petris, Denilson V Freitas, Rayany K V dos Santos et al.
The Titanium dioxide (TiO2) Nano-particles (NPs) is synthesized via the Sol-gel method by using t... more The Titanium dioxide (TiO2) Nano-particles (NPs) is synthesized via the Sol-gel method by using titanium tetrachloride (TiCl4) as a starting material while varying the applied temperature in the range of (400-900)ᵒC. The main features of the synthesized NPs have been examined by using X-ray diffraction (XRD), Field Emission Electrons Microscopy FESEM and Transmission Electron Microscopy (TEM). The main test of TiO2 NPs was carried out as an antimicrobial and antibacterial agent utilizing four types of bacteria strains (Pseudomonas aeruginosa) and Portus. Results of XRD show that the Titanium dioxide structure demonstrate an Anatase phase at (400 and 450)ᵒC as well as the rutile phase at 900ᵒC. The size of particles is found to be in the range of (15-20) nm for Anatase and for the rutile is in the range of (40-60) nm. FESEM results show the form was crystalline and appeared in the form of cauliflower or clusters for Nanoparticles. The antimicrobial agents can be utilized by the two phases of TiO2 for two types of bacteria (Pseudomonas aeruginosa) and Portus. The obtained results demonstrate that TiO2 in anatase or rutile phases is effective as anti-bacterial agents.
Uploads
Papers by Assist prof.dr.Olfat A H M A D Mahmood