5947

5562

كارشناسي ارشد

مهندسي شيمي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي

1389

چهارده،143ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمدقريشي، مهران غياثي

محمد حسين فتحي

1/3/90

نسرين اعتصامي، مسعود حق شناس فرد

مهندسي شيمي

ID5562

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Synthesis of Energetic Nanocomposite via Sol Gel Method and Investigation of Effective Parameters Mitra Shirani mshirani7722029@yahoo com Date of Submission Feb 09 2011 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Language Farsi Degree M Sc Supervisor Mohammad Ghoreshi ghoreshi@cc iut ac ir Abstract In this research the nano iron oxide via sol gel method was synthesized Using Fe NO3 9H2O ethanol and propylene oxide as gelation agent The produced gel was washed with ethanol via Soxhelt method for 4 days Then gel was dried in vacum oven for 6 days at 70 C Subsequently the synthesized gel was characterized using SEM EDX TEM FTIR BET and TG DTA The results of these analyses confirm the existance of amorph iron oxide water Fe2O3 Fe2O3 FeO OH and Fe OH 3 in this mixture The morphology of these particles show that they are spherical and agglomerate because of high reactivity and high surface area In order to enhance the purity of oxidizer some of the powder was heat treated at 410 C but the particle enlargement was observed According to TG analysis the purity of nano oxide is reported to be 96 consisting of mainly Fe2O3 At the same time some of the powder was dried at 120 C and particle size in this temperature was smaller than those obtained at 410 C But the impurity of the nano particles was higher at 120 C with respect to 410 C According to BET analysis heat treatment resulted in a growth of particle size and a reduction in surface area The oxidizer purity was calculated to be 79 at 120 C consisting of Fe2O3 and a little Fe2O3 The two synthesized oxidizers at 120 C and 410 C were separately mixed with 100nm Al via ultrasonification using n Hexane for 60 sec The mixing process was carried out with different stoichiometric ratios of oxidizer and fuel as follows 1 1 2 2 1 2 4 3 1 3 and 4 1 4 respectively Thus the number 4 stoichiometric ratio produced a fuel rich nanocomposite in comparison with the first three options In order to characterize the produced composite in terms of morphology particle size reaction temperature and the final specific products the SEM TEM DTA and XRD analysis were utilized The production of fuel nanocomposite was achieved with 4 m in addition to 100 nm Al The results of SEM indicated that the utilization of both nano Fe2O3 and nano Al improved the mixture homogeneity significantly in contrast to the nanocomposite formed with nano Fe2O3 and different percentages of nano Al as follows 1 100 nano Al 2 80 nano Al 20 micro Al 3 60 nano Al 40 micro Al 4 40 nano Al 60 micro Al 5 20 nano Al 80 micro Al and 6 100 micro Al Moreover the results of TEM analysis demonstrated that the morphology of produced nanocomposites are spherical with particle size of less than 200 nm The results of DTA showed that the reaction temperature was in the range of 500 600 C and XRD analysis indicated that the final products of this reaction are Fe and Al2O3 The combustion velocity experimentation proved that the stoichiometric ratios of a 1 2 2 b 1 2 9 had much higher combustion velociy compared to c 1 2 d 1 4

محمدقريشي، مهران غياثي

محمد حسين فتحي

نسرين اعتصامي، مسعود حق شناس فرد