Neutron Studies of the Structure of Non-Polar Magnetic Fluids with Surfactant Excess
Non-polar magnetic ﬂuid systems with an excess of surfactants have been studied with the use of the small-angle neutron scattering technique. Two types of highly stable ferroﬂuids, magnetite/oleic acid/decalin and magnetite/myristic acid/decalin, with a low (of about 1 vol.%) magnetite content and various acid fractions (up to 25 vol.%) are examined. The aggregation of magnetic particles and surfactant molecules is shown not to occur in the indicated concentration range of the acid molecule excess. The experimental results testify to a change of the interaction between the molecules of oleic and myristic acids in the free (non-adsorbed) state, when they are dissolved in magnetic ﬂuids, and in their solutions in decalin without magnetic particles.
B. Berkovsky and V. Bashtovoi, Magnetic Fluids and Applications. Handbook (Begell House, New York, 1996).
L. Vekas, M.V. Avdeev, and D. Bica, in Magnetic Nanofluids: Synthesis and Structure. Nanoscience and Its Applications in Biomedicine, edited by D. Shi (Springer, Berlin, 2009), p. 645.
U. H¨afeli and M. Zborowski, J. Magn. Magn. Mater. 321, 10 (2009).
V.E. Fertman, Magnetic Fluids (Vysheishaya Shkola, Minsk, 1988) (in Russian).
S. Taketomi and S. Chikazumi, Magnetic Fluids – Principle and Application (Nikkan Kogyo Shinbun, Tokyo, 1988) (in Japanese).
V.I. Petrenko, M.V. Avdeev, V.L. Aksenov et al., Poverkhnost Rentgen. Sinkhrotron. Neitron. Issled. 2, 92 (2009).
V.I. Petrenko, M.V. Avdeev, V.L. Aksenov et al., Solid State Phenom. 152, 198 (2009).
V.I. Petrenko, M.V. Avdeev, L. Alm’asy et al., Coll. Surf. A 337, 91 (2009).
M.V. Avdeev, I.A. Bodnarchuk, V.I. Petrenko et al., Zh. Fiz. Khim. 83, 7 (2009).
V.I. Petrenko, M.V. Avdeev, V.M. Garamus et al., Coll. Surf. A 369, 160 (2010).
M.V. Avdeev and V.L. Aksenov, Usp. Fiz. Nauk 180, 10 (2010).
V.L. Aksenov, M.V. Avdeev, A.V. Shulenina et al., Kristallografiya 56, 848 (2011).
V.Yu. Bezzabotnov, L. Cser, T. Grosz et al., J. Phys. Chem. 96, 976 (1992).
G. Jancso, L. Cser, T. Grosz et al., Pure Appl. Chem. 66, 515 (1994).
L. Cser, B. Farago, T. Grosz et al., Physica B 180, 848 (1992).
M.V. Avdeev, D. Bica, L. Vekas et al., J. Coll. Interface Sci. 334, 37 (2009).
J. Bloustine, T. Virmani, G.M. Thurston et al., Phys. Rev. Lett. 96, 087803 (2006).