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Preparation of Chloro Penta Amine Cobalt (III) Chloride and Investigate its Influence on the Structural Properties and Acoustical Parameters of Polyvinyl Alcohol

Authors: Nada K. Abbas ندى كاظم عباس --- Majeed Ali Habeeb مجيد علي حبيب --- Alaa J. Kadham Algidsawi الأء جواد كاظم
Journal: Journal of Kufa - physics مجلة الكوفة للفيزياء ISSN: 20775830 Year: 2015 Volume: 7 Issue: 2 English and Arabic Pages: 81-96
Publisher: University of Kufa جامعة الكوفة

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Abstract

Chloro penta amine Cobalt (III) Cloride [Co(NH3)5Cl]Cl2 was prepared then characterized by FTIR and XRD . The obtained results indicated the formation of Orthorhombic [Co(NH3)5Cl]Cl2 nano particles of ≈ 28.75 nm size .Polymeric films based on polyvinyl alcohol PVA doped with Chloro penta amine Cobalt (III) Cloride [Co(NH3)5Cl]Cl2 at different weight percent ratios were prepared using the solvent cast technique. The structural properties of these polymeric films were examined by XRD, FTIR and SEM studies. The complexation of the additive with the polymer was confirmed by FTIR and SEM studies. The XRD pattern revealed that the amorphousicity of PVA polymer matrix increased with raising the [Co(NH3)5Cl]Cl2 content. Ultrasonic pulse technique of variable frequency (25, 30, 35 and 40) kHz were performed to study the influence of ultrasonic frequency on the mechanical properties of PVA/ [Co(NH3)5Cl]Cl2 composite. Some properties such as ultrasonic velocity, acoustic impedance ,bulk modulus and transmittance and relaxation amplitude were found to be decreasing with frequency while absorption coefficient and compressibility were increasing with frequency .Results showed that ultrasonic wave made degradation to the randomly coiled polymer chains ,when ultrasonic frequency increase there were more degradation that increasing the number of un-tied chains as a result of absorbing composite ultrasonic waves ,for this reason it could be pointed that PVA/[Co(NH3)5Cl]Cl2 composite as a good ultrasonic absorber. It was found that there was significant relationship between ultrasonic velocity and material properties


Article
Effect of Kaolin Clay Concentration and Irradiation on the Electronic Transitions of Polyvinyl Alcohol Films
تأثير تركيز الكؤلين والتشعيع على الأنتقالات الألكترونية لأغشية بولي فنايل الكحول

Author: Hadi Ahmed Hussin هادي أحمد حسين
Journal: Diyala Journal For Pure Science مجلة ديالى للعلوم الصرفة ISSN: 83732222 25189255 Year: 2014 Volume: 10 Issue: 4 Pages: 14-24
Publisher: Diyala University جامعة ديالى

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Abstract

Pure and (1 and 3 wt%) kaolin doped PVA films were synthesized by solution casting method, and exposed to 60Co--rays, activity 2µCi for two weeks, The optical characterizations of the films were carried out using UV-Vis transmittance spectrophtometer in the wavelength range 300–900 nm. The results show that in the visible region the transmittance of the films increases as the kaolin concentration increase clearly as comared with the same film before irradiation. The dominant transmittance band of UV region increases after irradiation while the reverse is the case with the reflectance. Also results indicates that PVA films have an indirect band gap that decreased from 3.7 to 3.55 eV as the doping concentration increases to 3wt%. Also the energy band gap of the irradiated films appeared to be decreased from 3.9 eV down to 3.4 eV.

حضرت أغشية البولي فينايل الكحول غير المشوبة والمشوبة (1%, 3%) كاولين بطريقة الصب , وعرضت لأشعة كاما الناتجة من الكوبلت – 60 بنشاطة 2µCi لمدة اسبوعين, تم دراسة الخصائص البصرية باستخدام مطياف الأشعة فوق البنفسجية المرئية لمدى الاطوال الموجية 300 – 900 نانومتر. أثبتت النتائج ان النفاذية في المنطقة المرئية تقل بزيادة تركيز الكاولين عند مقارنتها مع الأغشيىة غير المشوبة. تزداد حزمة النفاذية المهيمنة في منطقة فوق البنفسجية بعد التشعيع بينما يحدث العكس في حالة الانعكاسية. كذلك فان النتائج تشير الى ان أغشية (PVA) ذات انتقال غير مباشر ويقل من 3.7 الى 3.55 eV بازدياد نسبة 3% . ان فجوة الطاقة المباشرة للأغشية المشععة تشير الى تناقص الفجوة من 3.9 الى3.4 eV .

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