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(2007) 3978. http://dx.doi.org/10.1016/j.matlet.2007.01.028 [16] Byrne D.M., Taguchi S., 40th annual quality congress, Anaheim, CA, 40 (1986) 168. [17] Taguchi G., Tables of orthogonal arrays and linear graphs, Maruzen, Tokyo, 1962. [18] Antony J., Antony F.J., Work Study Manag. Services, 50 (2001), 141. http://dx.doi.org/10.1108/00438020110391873 [19] Roy R.K., A primer on the Taguchi method, Society of Manufacturing Engineers, Michigan, 1990. [20] Tofighy M.A., Mohammadi T., Mater Res. Bull., 47 (2012), 2389. http://dx.doi.org/10.1016/j.materresbull.2012

Abstract

In this study, some stabilized magnetite based ferrofluids were synthesized using Dextran as a stabilizing agent. In order to achieve optimum experimental conditions for synthesizing ferrofluids as MRI contrast agents, the Taguchi method was used. This approach was employed to design and minimize the number of required experiments. By using the Taguchi orthogonal (L16) array, four parameters including solution temperature and alkalinity, reaction temperature and stirring rate were selected at four predetermined levels for 16 experiments. Synthesizing processes established based on this set of experimental conditions were carried out and the obtained ferrofluids were characterized using PCS, VSM, TEM and FT-IR techniques. The obtained results were used and analyzed through the Qualitek-4 software and the proposed optimum experimental conditions were used for synthesizing the desired sample. Finally, this sample was used as a potential MRI contrast agent for imaging lymph nodes.

spot welding process. They used the published experimental data to verify their model, and investigated the effects of contact resistance and electrode force on nugget size and shape. They found that with increasing electrode force, nugget size reduces due to decreasing contact resistance. Thakur et al . [ 3 ] presented a systematic approach to determine the effect of process parameters on tensile shear strength of RSW of austenitic stainless steel AISI 304 using the Taguchi method. Luo et al . [ 4 ] developed a mathematical model by using nonlinear multiple

knitted fabric, Textile Research Journal, V.55, p. 73-81, 1987. [14] Xu, D.: Research on Improving the Quality of Rotor Spinning Yarn”, Progress in Text Science & Technology, V. p. 6-13, 2010. [15] Kumar, A. Ishtiaque, S. M. and Salhotra, K. R.: Analysis of spinning process using the Taguchi method. Part IV: Effect of spinning process variables on tensile properties of ring, rotor and air-jet yarns, Journal of Textile Institute., V. 97, p. 38, 2006 [16] Kumar, A. Ishtiaque, S. M. and Salhotra, K. R.: Analysis of spinning process using the Taguchi method. Part III

Abstract

In this study, optimal conditions to form cellulose-MgO nanocomposite with antibacterial properties were evaluated. Applying the Taguchi method, 9 experiments were designed and the effects of different concentrations of biopolymers cellulose (0.5, 1 and 2 mg/ml), MgO nanoparticles (2, 4 and 8 mg/ml) and stirring times (30, 60 and 90 min) on antibacterial activity of synthesized nanocomposites were assessed. The characterizations of products were investigated by dynamic light scattering (DLS), raman spectroscopy, scanning electron microscope (SEM), thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The results showed that the nano-composite produced in the conditions of experiment 9 (MgO 8 mg/ml, cellulose 2 mg/ml and stirring time of 60 min) has the strongest antibacterial activity. The outcomes of both methods of colony forming units (CFU) and disc diffusion indicated that the antibacterial activity of cellulose-MgO nanocomposite was significantly higher than its components (P <0.05). Thermal analysis indicated improvement in the thermal stability of the cellulose biopolymer after the formation of the nanocomposite. Due to the improvement of the antibacterial properties of cellulose-MgO nanocomposite compared to its components, we can use it as a new antibacterial agent in the fields of pharmaceutical, medicine and dentistry.

: characterization of titanium surfaces for biomedical applications. Surf. Coat. Tech., 110 (1998), 48-56. [16] S. RAMESH, L. KARUNAMOORTHY, K. PALANIKUMAR: Measurement and analysis of surface roughness in turning of aerospace titanium alloy. Measurement, 45 (2012), 1266-1276. Application of Taguchi and ANOVA methods… 35 [17] S.K. BHAUMIK, C. DIVAKAR, A.K. SINGH: Machining Ti-6Al-4V alloy with a wBN-cBN composite tool. Mater. Design , 16 (1995)4, 221-226. [18] W. GRZESIK: A survey of current knowledge on machining titanium and its alloys. Proc. 5th International Scientific

of ring, rotor and air-jet yarns using the Taguchi method, AUTEX Research Journal, Vol. 19, No 1, March 2019, 6(3), 122-135. [17] Akshay Kumar, Ishtiaque, S. M. and Salhotra, K. R. (2006). Analysis of Spinning Process Using Taguchi Method Part IV: Effect of Spinning Process Variables on Tensile Properties of Ring, Rotor and Air-Jet Yarns, Journal of Text Institute, 97(5), 385-390. [18] Akshay Kumar, Ishtiaque, S. M. and Salhotra, K. R. (2006). Analysis of Spinning Process Using Taguchi Method Part V: Effect of Spinning Process Variables on Physical Properties of

Electrical Discharge Machining of AISI D2 Steel Using Taguchi Method World Academy of Science, Engineering and Technology 2008 (14) [20] J.L. Lin, K.S. Wang, B.H. Yan, Y.S. Tarng. Optimization of electrical discharge machining process based on Taguchi method with fuzzy logics, J Mater Process Technol 2000 (102), 48 - 55. [21] H.P. Raturi, L. Prasad, M. Pokhriyal, V. Tirth. Estimating the Effect of Process Parameters on Metal Removal Rate and Surface Roughness in WEDM of Composite Al6063/SiC/Al2O3 By Taguchi Method, Journal of Mechanical Engineering -Strojnícky časopis 2017

References [1] Phadke S.M., Quality Engineering Using Robust Design , Prentice Hall,Englewood Cliffs, N.J., 1989 [2] Taguchi G., Konishi S. Orthogonal Arrays and Linear Graphs ; American Supplier Institute Inc.: Dearborn, MI, USA, 1987. [3] Karna S.K., Sahai R., An Overview on Taguchi Method , International Journal of Engineering and Mathematical Sciences Jan.–June 2012, Vol. 1, 2319–4537. [4] Ross R.J. Taguchi Techniques for Quality Engineering , McGraw-Hill, New York 1989. [5] Byrne D.M., Taguchi S., The Taguchi approach to parameter design , Quality

International, 70, 52-62. 4. Fildes J.M.; Mayers S.J.; Kilaparti R.; Schlepp E. (2012), Improved ball crater micro-abrasion test based on a ball on three disc configuration, Wear , 274-275, 414-422. 5. Kamiński Z. (2013), Experimental and numerical studies of mechanical subsystem for simulation of agricultural trailer air braking systems, International Journal of Heavy Vehicle Systems , 20(4), 289-311. 6. Osuch-Słomka E.; Ruta R.; Słomka Z. (2013), The use of a modern method of designing experiments in ball-cratering abrasive wear testing, Journal of Engineering