Ali Reza Zarei*

[ 1 ] - Application of Mixed Micelle-Mediated Extraction for Selective Separation and Spectrophotometric Determination of P-Aminophenol Impurity in Pharmaceutical Formulations

A procedure for separation/preconcentration of para-aminophenol (PAP) in pharmaceutical formulation, based on cloud point extraction (CPE) as a prior step to determination by UV-Vis spectrophotometry has been developed. The analyte reacted with 4-dimethylamino benzaldehyde (DAB) in acidic media to form a shift base, which were separated and preconcentrated in a mixed micelle of the anionic surf...

[ 2 ] - Inverse Co-precipitation Synthesis of Copper Chromite Nanoparticles

In this study, copper chromite (CuCr2O4) nanoparticles was prepared by inverse co-precipitation method. In this method, cupric nitrate trihydrate, (Cu (NO3)2.3...

[ 3 ] - Selective Cloud Point Extraction for the Spectrophotometric Determination of Cetylpyridinium Chloride in Pharmaceutical Formulations

In this work, we developed a simple and selective method for separation and spectrophotometric determination of trace amounts of cetylpyridinium chloride (CPC) in pharmaceutical products using cloud point extraction (CPE) technique. The method is based on cloud point extraction of the CPC in alkali conditions using of nonionic surfactant Triton X-114. Under selected conditions, the calibration ...

[ 4 ] - Selective Cloud Point Extraction for the Spectrophotometric Determination of Cetylpyridinium Chloride in Pharmaceutical Formulations

In this work, we developed a simple and selective method for separation and spectrophotometric determination of trace amounts of cetylpyridinium chloride (CPC) in pharmaceutical products using cloud point extraction (CPE) technique. The method is based on cloud point extraction of the CPC in alkali conditions using of nonionic surfactant Triton X-114. Under selected conditions, the calibration ...

[ 5 ] - مروری بر پایداری و روش‌‌های تخمین طول عمر امولسیون‌های انفجاری

Emulsion explosive is a form of water in oil emulsions. They include a mixture of fuel and oxidizer and other components. Emulsions are a new type of industrial explosive materials. Because of the stability, high safety and well explosive performance, are used as a powerful and inexpensive source of energy in agriculture, water conservancy, transportation, mining, building materials and etc. So...

[ 6 ] - روشهای بهبود سرعت سوزش پیشرانه های جامد مولد گاز کیسه هوا

Airbag gas generator’s solid propellant, are set of gas-release systems within a short time, Which contains three main components of fuel, oxidizing agents and additives. This article examines the gas generator propellant types and their different functions and then the desired chemical and physical properties of different components and gas-producing propellant formulation may be checked...

[ 7 ] - بررسی بهبود خلوص آمونیم پرکلرات از طریق حذف کلرات با استفاده از نانو ذرات دوفلزی آهن- نیکل

Ammonium perchlorate is widely used as an oxidizer in the propellant formulation and pyrotechnics According to military standard having high purity and free of impurities such as chlorate . So, the removal of impurities in the production of ammonium perchlorate will be highly regarded. In this paper, the removal of chlorate was investigated by reducing process using metal nanoparticles. In this...

[ 8 ] - آشکارسازی 2، 4، 6- ‌تری نیترو‌تولوئن با استفاده از نقاط ‌کوانتومی کادمیم‌- تلوراید اصلاح ‌شده

The rapid and simple detection of 2,4,6-trinitrotoluene (TNT) as a high consumption explosive from nitroaromatic family, because identification of anti-terrorist sabotage and terrorism, always has been of high importance..Nowadays, methods for explosive compounds detection have been developed by using quantum dots (QDs). Quantum dots are nanoparticles of a new generation of nanotechnology that ...

[ 9 ] - مقایسه اثرکاتالیزوری نانوکرومیت مس و نانولوله‌های کربنی اصلاح شده در تجزیۀ حرارتی آمونیوم پرکلرات

In this study, the effect of copper chromite (CuO.Cr2O3) nanoparticles and multi-walled carbon nanotubes (MWCNTs) as nanocatalysts on the thermal decomposition behavior of ammonium perchlorate (AP) has been investigated using Differential Scanning Calorimetry (DSC). At first, copper chromite (CuO.Cr2O3) nanoparticles were prepared by inverse co-precipitation method. In this method, cupric nitra...

[ 10 ] - روشی سریع و آسان برای اندازه‌گیری اسپکتروفتومتری دی ‌متیل‌آمینو‌اتیل آزید (DMAZ) (علمی-پژوهشی)

Dimethylaminoethyl azide (DMAZ) is a good candidate fuel for hydrazine derivatives in aerospace industries. DMAZ is synthesized via reaction of dimethyl aminoethyl hydrochloride with sodium azide in aqueous solution, which, in next step, by adding of concentrated sodium hydroxide, organic phase is separated. Therefore, the determination of amount of unextracted DMAZ in aqueous phase (wastewater...

[ 11 ] - Synthesis of Carbon Nanotubes on Cerium-Substituted Barium Ferrite Substrate by Chemical Vapor Deposition for Preparation of a Microwave Absorbing Nanocomposite

In this research, at first, Ce-substituted barium ferrite, BaCe0.2Fe11.8O19 was prepared via the sol-gel method as a substrate and then Carbon NanoTubes (CNTs) was synthesized on the surface of the substrate by Chemical Vapor Deposition (CVD) technique. The structure, morphology, and electromagnetic performance of the synthesized nanocompos...

[ 12 ] - توسعه تکنیک تجزیه ای سریع و کارآمد بر پایه استخراج یاری شده با امواج التراسونیک به منظور تعیین اجزای تشکیل دهنده سوخت دوپایه به روش کروماتوگرافی مایع با کارایی بالا

In this study, an efficient and green technique based on ultrasound assisted extraction was developed for separation and determination of some components of double base solid propellant (DB propellant) by high performance liquid chromatography with UV detection (HPLC-UV-Vis the optimum extraction conditions with respect to maximum recovery for target analytes were achieved at 120 min, with powe...

[ 13 ] - یک روش ساده و قابل اطمینان برای اندازه گیری اسپکتروفتومتری تیتانیوم دی اکسید در پیشرانه های جامد دو پایه: مطالعه مقایسه ای با اسپکتروفتومتری نشری اتمی-پلاسمای جفت شده القایی

In this research, A reliable and simple method was described for the determination of the amount of titanium dioxide (TiO2) in double base solid (DB propellants), based on a comparison with Inductively coupled plasma method. The method is based on complex formation of Ti(IV) with Chromotropic acid in acidic media and monitoring absorbance of colored product by spectrophotometric technique at 46...

[ 14 ] - مروری بر برخی از کاربردهای آیروژل در صنایع دفاعی

Aerogel is a unique nanoparticle that has grown dramatically in the world of chemistry over the past few decades. Aerogel features: Very low density, ultra-porous surface, sound and heat absorber, and super hydrophobic. Depending on the type of aerogels and their synthesis methods, different applications in military industries such as: Explosives, Rocket fuels, thermal insulation, sound insulat...

[ 15 ] - یک روش اسپکتروفتومتری سریع با گزینش پذیری بالا برای اندازه گیری نیتروگلیسیرین در پیشرانه های جامد دوپایه

In this work, we developed and validated a simple and selective method for the determination of titanium dioxide in double base solid (DB propellants). The proposed method is based on alkaline hydrolysis of NG and followed by colored reaction of released nitrite ion with p-nitroaniline in the presence of diphenylamine in acidic media and produce azo dye. The effect of important parameters on ab...

[ 16 ] - مروری بر روش‌های مطالعه ترک در مواد پلیمری پرانرژی

Cracking is the breaking of bonds in a part of the propellant polymer due to the existing stresses that change the structure of the propellant polymer and they are classified into two general categories: macrocrack and microcrack. The service life of rocket engines is largely a function of the mechanical properties of the solid rocket propellant, the aging characteristics of the rocket propulsi...