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Synthesis of Graphene Oxide From Alternative Sources Miguel Sanchez Junior, Mauro Cesar Terence* and Juan Alfredo Guevara Carrió Materials Engineering Department Mackenzie Presbyterian University, Rua da Consolação, 896 – 01302-907 São Paulo/SP, Brazil sanchez@infomovel.com.br, mauroterence@yahoo.com.br, jgcarrio@gmail.com Keywords: graphite, graphene, oxidation, Raman spectroscopy, diffraction Abstract: Two-dimensional films of graphene oxide (GO) have been synthesized using various oxidation methods such as the conventional or modified Hummers method.

ACTA ARMAMENTRII.29 (2008) 891-896

Table 1 Physical properties of the fluid Properties HTPCM nanoparticle Density,r ( kg/m3) 2000 2700 Heat capacity, cp (J/KgK) 1500 896 Thermal conductivity, k(W/Mk) 0.5 207 Latent heat, L(J/kg) 100000 Phase change temperature, Tm(K) 493 Based on the foregoing assumptions, the conservation of mass, momentum, and energy for the two-dimensional, laminar, steady state natural convection flow in the enclosure is expressed as follows: Continuity:

Steven: Comput Struct ,Vol. 49(1993), pp. 885-896

Table.2 The final size of each parameter Parameter L/mm B/mm H/mm H1/mm R/mm Value 1 8 4 1 1.7 Table.3 Comparison of the difference of the two frequencies before and after optimization fE1/ Hz fB2/ Hz Δf/ Hz Before 90397 94047 3650 After 90037 90151 114 Δf 2/Hz 360 896 Experiment and analysis Frequency-response experiment According to the analysis, the prototype is manufactured [see Fig.5].

IEEE Transactions on Automatic Control, Vol. 42(7), pp. 896-911, (1997) [5] J.

Response curves of mechanical parameters of vehicle semi-axes It can be seen from Fig 4 that the maximum rolling force is 896.5KN and the maximum rolling moment is 358.6KN.m by finite element simulation.

Information classification Total number of Web sites Total number of Agent 1 Supply and demand information 3552 6523 2 Price distribution 2678 2865 3 Real estate news 926 1320 4 Real estate dynamic 576 896 … … … … Table 1 shows the statistics of experimental site.

Table 1 Chemical and physical properties of the GA Chemical composition (%) Physical properties SiO2 Fe2O3 CaO MnO MgO Al2O3 K2O Nn2O TiO2 P2O5 Melting point Density 71.8 3.32 0.88 0.08 0.33 10.99 4.55 5.1 0.23 0.08 1150~ 1200℃{TTP}8451 2.2~2.5 Table 2 Physical properties of polypropylene and nylon, steel fiber Type of fiber Density (g/cm3) Tensile strength (MPa) Elasticity modulus (MPa) Shape ratio (%) Diameter (㎛{TTP}13211 ) Length (mm) Polypropylene 0.91 325 3400 - 20 6 Nylon 1.15 896 4500 - 12 6 Steel fiber 7.85 1118 - 62.7 0.5 31.06 Table 3 Mixing properties composition of W/B ratios and materials Specimens W/B (%) GA (%) Ny (%) PP (%) SF (%) Materials (kg/m3) Cement GA Sand Water NS-GA-01 40 5 0.1 None 0.4 344.4 18.1 727 145 NS-GA-02 20 0.4 None 0.8 290.0 72.5 737 NS-GA-03 55 5 0.1 None 0.4 276.4 14.5 608 160 NS-GA-04 20 0.4 None 0.8 232.7 58.2 616 PS-GA-01 40 5 None 0.1 0.4 344.4 18.1 727 145 PS-GA-02 20 None 0.4 0.8 290.0 72.5 737 PS-GA-03 55 5 None 0.1 0.4

Vol.46 (2008), pp:873-896.