مدل سازي سطح پاسخ عوامل تاثير گذار بر اندازه نانو ذرات پلي اكريليونيتريل توليدشده به روش الكترواسپري

چكيده انگليسي :

Response Surface Modeling of Effective Parameters on Electrosprayed PAN Nanoparticle Size Sanaz Khademolqorani s khademolqorani@tx iut ac ir Date of Submission 11 20 2011 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors Prof H Tavanai tavanai@cc iut ac ir Prof A Zeinal Hamadani hamadani@cc iut ac irAbstractElectrospraying electrohydrodynamic spraying is a method of liquid atomization by means of electrical forces Inelectrospraying the liquid flowing out of capillary nozzle which is maintained at high electric potential is forced bythe electric field to be dispersed into fine droplets The process start with onset and emission which is followed bycolumbic explosions leading to further breakdown of droplets until they reach collector Droplets can be extremelysmall in special cases down to nanometers The charge and size of the droplets can be controlled to some extent byvoltage concentration flow rate of the liquid at the capillary nozzle and gauge of needle Spraying solution orsuspensions allows production of fine particles down to nanometer size Nanometer sized particles are ofconsiderable interest for a wide variety of applications because the chemical and physical behavior of the particlesis unprecedented and remarkably different from those in bulk form Due to small size and extremely large specificsurface area are useful for microencapsulation chromatography catalyst organic inorganic hybrid materials andtemplates for porous inorganic materials Knowledge of the nanoparticle size and it s distribution is important forthe interpretation of experimental result in many studies of nanoparticle properties for example magnetic recordingmedia ferro fluids catalysts and in biotechnology In this research the effect of material and process parameters on electrosprayed polyacrylonitrile particles size wasmodelled Acrylonitrile is a commonly used monomer for producing acrylic fiber and also acts as comonomer in thesynthesis of engineering plastics because of its high chemical resistance barrier property and high reactivity withother monomer such as vinylidene chloride and styrene To model the electrosprayed polyacrylonitrile particles size a factorial design was employed and finally apolynomial model was represented by response surface methodology RSM For modeling four factors namely applied voltage solution concentration volume flow rate and diameter of syringe needle were chosen each at threelevels The choice of three levels for each factor in the experimental design allowed us to take advantage ofquadratic models At first full factorial experimental design at three levels of each factor was carried out and theANOVA analysis is used to study the treatments Then values for coefficients P values and R2 for response surfacemodel are obtained by regression analysis Response surface method is a collection of mathematical and statisticaltechniques that are used to model and analyze engineering applications The response surface method is applied tosituations where several input variables potentially influence some performance or characteristics of the process thatoften called response The relationship between the response y and k input variables could be expressed in terms ofmathematical notation The ANOVA analysis showed that all main effects of four factor and interaction of appliedvoltage and flow rate were found statistically significant in the mean of electrosprayed polyacrylonitrile particlesize p value 0 05 Finally the mean size of nanoparticles was modeled by RSM as a functions In representedmodel the R2 values is about 0 80 illustrating that the model is able to explain 80 2 of the variability in the meanparticle size Key wordsElectrospraying Polyacrylonitrile Nanoparticles Particle Size Response Surface Methodology Modeling

خادم القراني، ساناز

مدل سازي سطح پاسخ عوامل تاثير گذار بر اندازه نانو ذرات پلي اكريليونيتريل توليدشده به روش الكترواسپري

اندازه ذره , روش رويه پاسخ , مدل سازي