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Article
Spectral Study of Silver Nanoparticles Prepared by Chemical Method
الدراسة الطيفيه لدقائق الفضة النانوية المحضره بالطريقة الكيميائية

Authors: Mukhlis M. Ismail --- Salah M. Abd Ulaziz
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 5 Part (B) Scientific Pages: 869-876
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Silver nanoparticles were prepared by the reduction of silver salt (silver nitrate AgNO3) solution using three different methods. The main differences between these methods is by belong to the reducing agent. It is found that the prepared silver nanoparticle was pure and stable for long time. UV-VIS spectrometry indicated formation of spherical silver nano particles. The surface plasmon resonance peaks in absorption spectra for silver colloidal solution showed that the absorption maximum range was at 380- 420 nm. The structures are confirmed by X-ray diffraction (XRD) and the crystallite size was determined from X-ray line broadening using the Scherrer's equation and it was about 32 nm.AFM measurements show that silver nano particles have the average diameter of 69.39 nm and 81.91 nm.

تم تحضيردقائقالفضه النانوية باستخدام ثلاثة طرق مختلفه وذلك باختزال نترات الفضة ((AgNO3.ان الاختلاف الرئيسي بين هذه الطرق هو استخدام العامل المختزل. دقائق الفضه النانويه المحضرة وجدت نقيه ومستقرّة لوقت الطويل.جهاز قياس الطيف اشارإلى تشكيل الدقائق النانوية الفضية الكرويه . قمم طيف الامتصاص للمحلول الفضّي اظهرت بأنّ الإمتصاص الأعظم كان في مدى(nm420- 380).التركيب لدقائق الفضه النانويه والحجم البلوري مؤكّدة بوسطة قياس حيود الاشعة السينية (XRD ) و بإستعمال معادلة Scherrer's كان حوالي 32nm.

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Article
Analysis of Boltzmann Equation for SF6 and Some Gas-Mixture Discharges at Critical Field Condition

Authors: Abdulrida S. Hasaani --- Mukhlis M. Ismail
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2016 Volume: 12 Issue: 1 Pages: 31-34
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The energy electron distribution function at a particular reduced electric field E/p (where E is the electric field and p is the gas pressure) for SF6+He and SF6+Ar mixtures has been studied. The distribution function has been calculated as a function of percentage mixture ratio (k) ranging from zero (pure SF6) to 100% (for He or Ar) at (E/p)crt. On the other stage, these distribution functions are also studied as a function of (k) at a particular (E/p)crt. under which the breakdown occurs for the same gas mixtures. The (E/p)crt calculation is adopted to explain the discrepancy of the distribution function for gas mixtures. It is also found that the distribution function for gas mixtures at (E/p)crt. and for any value of (k) are identical.


Article
Analysis of Boltzmann Equation for SF6 and Some Gas-Mixture Discharges at Critical Field Condition
تحليل معادلة بولتزمان لسداسي فلوريد الكبريت وبعض تفريغات الخلائط الغازية تحت شرط المجال الحرج

Authors: Abdulrida S. Hasaani --- Mukhlis M. Ismail
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2017 Volume: 13 Issue: 1 Pages: 31-34
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The energy electron distribution function at a particular reduced electric field E/p (where E is the electric field and p is the gas pressure) for SF6+He and SF6+Ar mixtures has been studied. The distribution function has been calculated as a function of percentage mixture ratio (k) ranging from zero (pure SF6) to 100% (for He or Ar) at (E/p)crt. On the other stage, these distribution functions are also studied as a function of (k) at a particular (E/p)crt. under which the breakdown occurs for the same gas mixtures. The (E/p)crt calculation is adopted to explain the discrepancy of the distribution function for gas mixtures. It is also found that the distribution function for gas mixtures at (E/p)crt. and for any value of (k) are identical.


Article
Electron swarm phenomena in SF6+He and SF6+Ar mixtures

Authors: Sheahab A. Zeidan --- Mukhlis M. Ismail --- Duraid F. Mahadi
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2006 Volume: 9 Issue: 2 Pages: 81-89
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

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Article
Enhancement of DSSC by Using Gold Nanoparticles
تحسين خليه الصبغه باستخدام جسيمات الذهب النانويه

Authors: Ghufran S. Jaber --- Abdulrahman K. Ali --- Mukhlis M. Ismail
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 1 Part (B) Scientific Pages: 73-79
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this research, AuNPs prepared by laser ablation in liquid (PLAL) at 750 mJ energy and 90 pulses. They have been added to N719-dye to form (Au-N719) mixture. TiO2 paste was deposited on FTO substrates and immersion in a mixture dye and AuNPs. DSSC was fabricated and enhancement of the DSSC conversion efficiency was achieved. Scanning electron microscope, X-ray diffraction and UV-Visible spectrophotometer were used to characterize and study the DSSC components. The UV-Vis data show high absorbance of AuNPs+N719 dye compared to N719 dye only; that means the immersion of AuNPs in the N719-dye solution tend to increase the total absorbance of the dye. The XRD pattern of AuNPs has diffraction peaks at 38.2° and 44.4° which can be indexed by (111), (200) plane of Au in the cubic phase. The shape and size distribution shows spherical AuNPs with particle size about (50-60) nm. The relative increase of short circuit current density after the adding gold nanoparticles was about 76%. In the same way the relative increase of open circuit voltage after adding gold nanoparticles was about 6.7%. The total photon-to-current energy conversion efficiency for the standard DSSC is 1.75 while its 2.8 of the enhanced DSSC with gold NPs.The maximum enhancement is about 60 % under illumination (105 mW/cm2, (AM1.5).

في هذاالبحث،تمت إضافة جزيئات الذهب التي تم تحضيرها باستخدام الليزر(750ملي جول وعدد نبضات 90نبضه) للصبغة ليكون خليط. معجون التيتانيوم المرسب على قاعده فلورين اوكسيد القصديرغمس في الخليط المكون من الصبغه وجسيمات الذهب النانويه. بعد ذلك تم تصنيع خليه الصبغه وتحسين كفائتها.مجهر الماسح الالكتروني تشتت الاشعه السينيه ومطياف المرئي- فوق البنفسجي استخدم لتشخيص ودراسه خصائص خليه الصبغه. وجد ان امتصاص خليط الصبغه وجسيمات الذهب النانويه اعلى من الصبغه لوحدها مما ادى الى زياده الامتصاصيه الكليه للصبغه بعد اضافه جسيمات الذهب النانويه. تشخيص الاشعه السينيه لجسيمات الذهب النانويه كشفت عن مستووين (200) و (111) لزاوايا الحيود وهي (38.2 و44.4) وبطور المكعب. توزيع جسيمات الذهب النانويه كرويه الشكل وذات حجم يترواح بين (50 -60) نانوميتر . الزياده النسيبه في تيار الدائره القصيره بعد اضافه جسيمات الذهب النانويه كانت76%. بنفس الطريقه فولطيه الدائره المفتوحه بعد اضافه جسيمات الذهب النانويه كانت 6.7%. الكفاءه لخليه الصبغه النموذجيه هي 1.57 لكن خليه الصبغه المحسنه كانت 2.8 باستخدام ضوء الشمس كمصدر اضاءه بقدره 105ملي واط سم2 وكتله هواء 1.5 وحققت تحسين بلكفاءه بمقدار60%.

Keywords

PLAL --- DSSC --- AuNps --- N719-dye


Article
Effect of Hydrothermal Reaction Temperatures on Structural and Optical Properties of ZnS Nanoparticles

Authors: Selma M .H. Al-Jawad --- Mukhlis M .Ismail --- Sora Emad
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 6 Part (B) Scientific Pages: 808-819
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A ZnS nanoparticle was prepared using hydrothermal interaction of zinc acetate with Thiourea in different reaction temperatures (170oC, 180oC, 185oC, 190oC). The structural characterization of synthesized nanoparticle was determined by X-ray diffraction (XRD) which showed a hexagonal structural of ZnS. Scanning electron microscopy (SEM) and energy dispersive spectrum (EDS) analysis were confirmed that the morphology and elemental analysis was formed ZnS nanoparticle. Absorption study has been carried out using UV-VIS spectrophotometer to determine the band gap of ZnS nanoparticle. The optical energy band gap was changed at values equal to (4.16, 4.46, 4.1 and 4.35eV) with different hydrothermal temperatures at (170oC, 180oC, 185oC and 190oC) respectively. However, these values of energy gaps for ZnS nanoparticles are blue shift and larger than that bulk value due to quantum confinement. Fourier Transform Infrared Spectra (FTIR) is recorded in an FTIR spectrometer to verify the presence of ZnS powder. The particle size of ZnS calculated was ranged between 3.5 to 3.9 nm according to Sherrer's equation and the results were compatible when using Effective Mass Approximation (EMA).


Article
Preparation and structural properties of multi-phases Nanocrystalline CaCu3Ti4O12

Authors: Mukhlis M. Ismail --- Balkees.M.Aldabbagh --- Logean Q. Ibrhium
Journal: journal of the college of basic education مجلة كلية التربية الاساسية ISSN: 18157467(print) 27068536(online) Year: 2014 Volume: 20 Issue: 84 / علمي Pages: 889-910
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Nanocrystalline multiphase CaCu3Ti4O12 (CCTO) was prepared using CaNO2.6H2O , CuNO2.2H2O , TiO 2and oxalic acide. Effect of pH has been studied from the phase formation behavior of the CCTO powder wherein the pH was varied 3, 5, 6, 7, 8, and 11. It is found that the multiphase are content a TiO2, CuO, CaTiO3 and CCTO as shown on XRD result. The crystallite size was about 60 nm according to XRD result using Scherrer,s equation. The color of prepared (CCTO) powder was light blue at room temperature, then it changes to brown and dark brown when annealing at 800oC and 900oC respectively which can attributed to demerit second phase. Carbonate groups were observed in the prepared powder calcined 900oC at pH equals to 6 and 7 that showed at FTIR spectroscopy as a vibration peaks. These groups were not showed in powder calcined 900oC at pH equals to 5. FTIR and XRD results have confirmed that the pH value for preparing multi phases CCTO is 5.

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Article
Preparing of Barium Titanate Using Chemical Method and Studying of Its Structural Properties
تحضیر مادة باریوم تیتانیت بالطریقة الكیمیائیة ودراسة خصائصھا التركیبیة

Authors: Mukhlis M. Ismail --- Abdulkarim Z. Khalf --- Rawa A. Helal --- Oday N. Salman --- et al.
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2012 Volume: 30 Issue: 19 Pages: 3362-3370
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Single crystalline BaTiO3 (BT) was prepared using TiCl4, BaCl2 and oxalicacid. The structure of the prepared nanocrystalline BT powders were a tetragonalperovskite according to XRD and HRTEM analysis. Annealing powder to 750oCshow that pure BT phase was formed according to XRD, TG, and FTIRspectroscopy. The TEM images of the prepared powder reveal sphericalmorphology of BT, while a finger twin, dendritic and embryo shape are observedof BT powder calcined at 230, 530, and 750oC respectively. SAED and HRTEMimages showed a high crystalline BT powder and a single crystalline BTrespectively.

بطریق ة ح امض (BaCl و( 2 (TiCl ت م تحض یر ب اریوم تیتانی ت اح ادي التبل ور باس تخدام ( 4الاوكزالیك. اظھرت نتائج الدراسة بان مادة الب اریوم تیتانی ت ذات ط ور رب اعي وذل ك ع ن طری قوك ذلك م ن خ لال ح رق المس حوق الن اتج ال ى درج ة 750 .(HRTEM) و (XRD) تحلیلات الاظھ رت كروی ة (TEM) ظھر المسحوق بشكلھ النقي. الصور المأخوذة لمسحوق الباریوم تیتانی تالشكل عند حرقھ الى درجة 230 ، بینما تغیرت اشكالھ الى اصابع توأمیة، واشكال شجیریة وجنینیةعند حرقھ عند درجة 530 و 750 على التوالي.


Article
Dielectric properties of Li doped Ni-Zn ferrite
الخصائص الكهربائية للنيكل زنك فرايت المشوب بالليثيوم

Authors: Mukhlis M. Ismail مخلص مولود اسماعيل --- Nasma A. Jaber نسمة عدنان جبر
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2018 Volume: 16 Issue: 36 Pages: 140-152
Publisher: Baghdad University جامعة بغداد

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Abstract

Lithium doped Nickel-Zinc ferrite material with chemical formula Ni0.9−2x Zn0.1LixFe2+xO4, where x is the ratio of lithium ions Li+ (x = 0, 0.01, 0.02, 0.03 and 0.04) prepared by using sol-gel auto combustion technique. X-ray diffraction results showed that the material have pure cubic spinal structure with space group Fd-3m. The experimental values of the lattice constant (aexp) were decreased from 8.39 to 8.35 nm with doped Li ions. It was found that the decreasing of the crystallite size with addition of lithium ions concentration. The radius of tetrahedral (rtet) and octahedral (roct) site were computed from cation distribution. SEM images have been taken to show the morphology of compound. The dielectric parameters [dissipation factor (Df), the dielectric constant (Ԑ') and a.c. conductivity (σac)] of spinal ferrite nano-powder have been measured. The dielectric parameters as a function of concentration have been studied for ferrite synthesis. The saturation of magnetization (Ms), remiensis (Mr) and coersivity (Hc) were found from hysteresis loop. The Ms and Hc varied from 36.47 to 66.15 emu/gm and 103 to 133 Oe for ferrite synthesis, respectively.

تم تحضير نيكل-زنك فرايت المشوب بأيونات الليثيوم باستخدام تقنية الاحتراق التلقائي (sol-gel auto combustion). من طيف الاشعة السينية تم حساب القيم العملية لثابت الشبيكة (aexp) حيث وجد انه يقل مع إضافة ايونات الليثيوم بالإضافة الى النقصان في حجم البلورة. تم دراسة الخصائص الكهربائية كدالة للتردد ولقد وجد ان ثابت العزل والتوصيلية تقل مع زيادة التردد لكل العينات. لكن عند دراستها كدالة للتركيز فقد وجد ان هذه القيم تزداد مع اضافة الليثيوم. من حلقة الهسترة تم تحديد تمغنط الاشباع MS وحساب القيم العملية والنظرية لعزوم التمغنط.

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