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Article
Third Order Optical Nonlinearity of Silver Nanoparticles Prepared by Chemical Reduction Method

Author: Hussein T. Salloom
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2017 Volume: 20 Issue: 3 Pages: 99-104
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

In this study, silver colloidal nanoparticles have been prepared by chemical reduction of silver nitrate by trisodium citrate as a reduction agent. The adding time of the reduction agent was held constant while the time of stirring was varied. The resulting silver nanoparticles were characterized by UV-VIS absorption spectroscopy. The non-linear refractive index and absorption coefficient of silver nanoparticles were investigated using a single beam z-scan technique. The excitation source was a continuous wave (CW) of 532 nm diode laser with a beam power of 40 mW. All investigated samples showed negative and large thermally-induced non-linear refractive indices. Other nonlinear optical parameters (i.e.β,χ_r^((3)),χ_i^((3))) were also calculated. Our measurements confirm that the non-linear parameters are caused by self-defocusing process making them potential candidates for nonlinear optical devices.


Article
Synthesis and Optical Characterization of Ag/PVA Nanocomposites Films

Author: Hussein T. Salloom
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2017 Volume: 20 Issue: 4 Pages: 56-63
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Silver- Poly vinyl alcohol Ag/ PVA nanocomposite films were prepared by casting method at room temperature with different amount of AgNO3 solution (0.001, 0.0015, and 0.002ml). The prepared nanocomposites were characterized using UV–VIS spectrophotometer and the optical properties were investigated in the wavelength range 300-800 nm. The absorption peaks showed a shift towards higher wavelength with increasing AgNO3 concentration while the energy band gap and absorption edges shifted towards lower energies with the increase of AgNO3 concentration.


Article
Synthesis and Refractive Index Characterization of EBBA Liquid Crystal

Authors: Soror A.Mahdi --- Suha M.Khorsheed --- Hussein T. Salloom --- Ahmed K. Ahmed
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2016 Volume: 19 Issue: 1 Pages: 98-103
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

In this paper, the Nematic Liquid Crystal (NLC) N-(4'-ethoxybenzylidene)-4-n-butylaniline (EBBA) with transition temperature range between (36-80) ℃ was prepared and identified using Fourier transform infrared spectroscopy (FTIR).The prepared compound (EBBA) was used to calculate the values of refractive index at different temperatures and measurements were done in the temperature range (25-80)℃. The result shows, the values of refractive index values decreases with increase temperature in thermal range.

في هذا البحث تم تحضير المركب البلوري السائل (النيماتي) N-(4-ايثوكسي بنزلدين)-4-ن-بيوتل انيلين (EBBA) الذي يكون الطور البلوري السائل النيماتي له بدرجة حرارة انتقالية بمدى (080م-036م) وتشخيص التركيب الكيمياائي له باستخدام مطياف الاشعة تحت الحمراء FTIR.المادة البلورية السائلة (EBBA) تم استخدامها في حساب قيم معامل الانكسار بدرجات حرارية مختلفة والقياسات اجريت عند المدى الحراري (080م-025م). النتائج توضح ان قيم معامل الانكسار تتناقص بزيادة درجة الحرارة.


Article
Calibration Free Laser Induced Breakdown Spectroscopy (CF-LIBS) as a tool for Quantitative Elemental Analysis of Iraqi Cement

Authors: Alaa J. Ghazai --- Hussein T. Salloom --- Alaa H. Ali --- Tagreed K. Hamad
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2018 Volume: 00 Issue: 1 Pages: 60-68
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Laser-induced breakdown spectroscopy (LIBS) is a promising atomic emission based elemental analysis technique that has many potential applications for various samples. This paper presents the implementation of calibration free laser induced breakdown spectroscopy (CF-LIBS) approach to identify and determine the concentration of elements in Iraqi cement samples collected from local market. Q-switched Nd: YAG laser with energy laser pulse of 100 mJ and pulse duration of 9 ns is focused on cement pellet surface to generate a plasma spark in air. The plasma emission spectrum was recorded by the spectrometer connected to the fiber optic and resolved spectra were used for identification and quantification of detected elements. The produced plasma temperature was obtained from the Boltzmann plot method while their electron density was determined by Saha-Boltzmann equation. The major elements such as Ca, Si, Al, Fe, Mg and minor Mn, Ti, K and Na elements have been identified and their concentrations calculated based on analysis of the spectrum that contain all information needed to derive the elemental composition of the cement matrix.

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