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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Nanostructures
- نوع مقاله: Journal Article
- کلمات کلیدی: Taguchi Method,silver nanoparticles,Gelcasting
- چکیده:
- چکیده انگلیسی: In the present study, silver nanoparticles were synthesized by decomposition of AgNO3 via gelcasting. Methacrylamide was used as a low toxic monomer for gel formation. Effect of monomer content (MAM), cross-linker to monomer ratio (MBAM/MAM), silver salt to monomer ratio (AgNO3/MAM), duration of calcination, and temperature of calcination were investigated to optimize the size of nanoparticles. Taguchi method was applied to study the effect of gelcasting parameters on the size of silver nanoparticles. Mentioned parameters were surveyed at four levels and based on the Taguchi method 16 experiments were carried out. Silver nanoparticles were characterized, and average particle sizes were measured by SEM analysis. By using the signal to noise ratio (S/N) analysis of the results, it is revealed that monomer content is the most effective parameter on size of particles. Also, optimal values of monomer content, cross-linker to monomer ratio, silver salt to monomer ratio, duration of calcination and temperature of calcination for the minimum particle size were found to be 4.25 g (in 20 g water), 1:3, 1:15, 6 h and 650⁰C, respectively. An evaluation test was performed with the optimal value of parameters, and suitable agreement between the prediction and experimental results was observed.
- انتشار مقاله: 19-05-1397
- نویسندگان: Ali Askari Zadeh Mahani,Mehrdad Manteghian
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Nanostructures
- نوع مقاله: Journal Article
- کلمات کلیدی: Nanoparticles,Induction time,barium sulfate,Biopolymers
- چکیده:
- چکیده انگلیسی: A major portion of BaSO4 is used as drilling fluid additives in the presence of some biopolymers such as starch and PAC (Polyanionic Cellulose) as filtration control and viscosifier. BaSO4 nanoparticle was synthesized in the presence of these applicable polymers with precipitation method by using BaS produced from carbothermal method and Na2SO4. Synthesized nanoparticles size and morphology were analyzed using DLS (Dynamic Light Scattering) and FESEM (Field Emission Scanning Electron Microscope). It can be concluded that, nanoparticles size have inverse proportion with polymer concentration. Also nanoparticles have smaller size in the presence of PAC with longer functional group than starch and prevent chemical reaction due to steric hindrance. If pH increases from 7 to 11, nanoparticles in starch had minimum size in pH=9 and various pH didn’t have noticeable effect on size with PAC. In kinetic study, conductometer is used to detect induction time in different Na2SO4 concentrations and polymers and it is indicated that interfacial tension is decreased as reactant concentration increased and PAC increase induction time and reduce interfacial tension more than starch.
- انتشار مقاله: 05-01-1397
- نویسندگان: Mehrdad Manteghian,Abdolhamid Sameni
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Biopolymer,Rheology,microscopy,Colloidal gas aphron,Microbubble,Shear-thinning
- چکیده:
- چکیده انگلیسی: Colloidal Gas Aphrons (CGA), consist of gas bubbles with diameters ranging from 10 to 100 micron, surrounded by a thin aqueous surfactant film. This fluid combines certain surfactants and polymers to create the systems of microbubbles. The function of surfactant in CGAs is to produce the surface tension to contain the aphrons. Also, a biopolymer needs to be considered in the formulation as a viscosifier as well as a stabilizer. The aphron-laden fluid appears to be particularly well suited for drilling through depleted zones. The unique feature of aphron based fluids is to form a solid free, tough, and elastic internal bridge in pore networks or fractures to minimize deep invasion using air microbubbles. This microenvironment seal readily cleans up with reservoir flow back as production is initiated, thereby reducing the cost associated with stimulation processes. This paper presents a comprehensive, comparative study of rheological behavior and filtration properties of CGA based drilling fluids with various concentrations of polymer and surfactant. Laboratory evaluations showed that the CGA based fluid is one of the ideal engineering materials which can control and kill the loss circulation, save cost and increase productivity in which rheological characteristics and filtration properties of them are greatly influenced by the level of polymer and surfactant concentration.
- انتشار مقاله: 28-05-1395
- نویسندگان: Hamid Reza Poorabbasi,Mehrdad Manteghian,Hormoz Ghalavand
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Modelling,Nucleation,Particle formation,Supersolubility,Metastable zone,Mathematical
- چکیده:
- چکیده انگلیسی: Prediction of supersolubility and the width of the metastable zone has been a major concern among the workers in the field of industrial crystallization. Operation of crystallizers under the optimum supersaturation low enough to attain the desired product quality (Median Particle Size, Crystal Size Distribution (CSD), Shape, Purity) being one motif. The inherent relationship between the subject and the most fundamental concepts of crystallization being the other. Studying the conditions of primary homogenous nucleation and the crystal growth kinetics has been conducted for a wide range of inorganic materials. A simple probabilistic term called chance of having the desirable species congregation, has been introduced to account for the effect of solution composition. A semi-empirical model has been developed for occasions where primary homogenous nucleation occurs at a specified undercooling rate (0.2 oC/hr). The model has been found to satisfy the experimental results obtained for 28 inorganic systems under various conditions. Theconcept may be equally applicable in nucleation of organic materials and for cases where liquid nuclei (such as rain droplets) are formed.
- انتشار مقاله: 07-06-1381
- نویسندگان: Iraj Naser,Mehrdad Manteghian,Dariush Bastani,Mohsen Mohammadzadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian (Iranica) Journal of Energy & Environment
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی:
- انتشار مقاله: 11-10-1348
- نویسندگان: Javad Gholami,Alireza Badiei,Alireza Abbasi,Mehrdad Manteghian,Ghodsi Mohammadi Ziarani
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of New Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Nanoparticles,potassium chloride,Induction time,Nucleation mechanism,Interfacial tension
- چکیده:
- چکیده انگلیسی: Prediction of the nucleation mechanism is one of the most critical factors in the design of a crystallization system. Information about the nucleation mechanism helps to control the size, shape, size distribution, and purity of the produced crystals. When the crystallization method is used for producing nanoparticles, the nucleation mechanism should be predicted. In this study, an empirical correlation based on the induction time, classical nucleation theory, and Kashchive model is used to determine the nucleation mechanism. Nanoparticles are produced in the presence of Cetyl Trimethyl Ammonium Bromide (CTAB) and the effect of CTAB on the induction time and the interfacial tensions of potassium chloride nanoparticles have been investigated. The obtained results demonstrated that the nucleation mechanism of potassium chloride nanoparticles is heterogeneous. This method is simple and can be applied at ambient conditions for synthesis other mineral nanoparticles. It can also be applied to study the induction time with high accuracy.
- انتشار مقاله: 07-08-1397
- نویسندگان: Amir Faravar,Mehrdad Manteghian
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Environmental Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption Isotherm,chicken feather,keratin nanoparticle,biosorbent,Cu(II) removal
- چکیده:
- چکیده انگلیسی: A straightforward procedure to synthesize keratin nanoparticles (KNP) from chicken feathers was introduced. The characterization of the synthesized nanoparticles was done using Fourier transform infrared (FTIR) spectroscopy, dynamic light scattering (DLS), X-ray diffraction (XRD) patterns and transmission electron microscopy (TEM). The FTIR analysis revealed no significant chemical change after the nanoparticle synthesis. TEM imaging indicated the synthesis of KNPs with a spherical morphology and mean size of 42 nm. The DLS results indicated that the synthesized KNPs were stable in aqueous media by having a zetapotential of lower than -30 mV. The produced KNPs were then evaluated for the biosorption of Cu (II) from aqueous solutions. The analyzed adsorption isotherm data revealed the change from a Redlich-Peterson isotherm to a Langmuir one by increasing the biosorbent dosage, which could be attributed to the more prepared adsorption sites. The experiments of the effect of the biosorbent dosage suggested the best removal at a KNP dose of 3.0 g/L. At this dosage, the maximum Cu (II) adsorption capacity and Langmuir constant were 50 mg/g and 10.8×10-3 L/mg, respectively; the adsorption kinetic followed the pseudo-second order model.
- انتشار مقاله: 16-03-1397
- نویسندگان: Seyedeh Zahra Mousavi,Mehrdad Manteghian,Seyed Abbas Shojaosadati,Hassan Pahlavanzadeh
- مشاهده