Magnetic-field-sensitive polymers

Zrinyi, M. (1997) Magnetic-field-sensitive polymer gels. Trends Polym. Sci., 5, 280-285. 

M. (1998) Shape transition of magnetic field sensitive polymer gels. Macromolecules, 31, 6541-6548. 

Zrinyi M, Szabo D, Genoveva F, Feher J (2002) Electrical and magnetic field-sensitive smart polymer gels. In Osada Y, Khokhlov AR (eds) Polymer gels and networks. Marcel Dekker, New York, pp 309-356... 

Zrfnyi M, Szabo D, Barsi L (1999) In Osada Y, Rossi DE (eds) Magnetic field sensitive polymeric actuators. Polymer sensors and actuators. Springer, Berlin Heidelberg New York, p 385... 

Varga, Z. FHipcsei, G. Zrinyi, M., Magnetic Field Sensitive Functional Elastomers with Tunable Elastic Modulus. Polymer 2006,47, 227-233. 

Magnetic field sensitive gels are chemically cross-linked polymer networks swollen by a ferrofluid (Berkovski and Bashtovoy, 1996 Nakano and Koyama, 1997 Rosenweig, 1985). A ferrofluid or a magnetic fluid is a colloidal dispersion of monodomain magnetic particles with a typical size of about 10 nm. 

Zrinyi S, Szabd, D, Filipcsei G and Feher J (2001) Electric and magnetic field-sensitive smart polymer gels, In Y Osada and Khokhlov (eds), Polymer Gels and Networks, Marcel Dekker, Inc. New York, Chapter 11, pp. 309-355. 

Varga, Z., Filipcsei, G., Zrinyi, M. (2006), Magnetic field sensitive functional elastomers with tuneable elastic modulus. Polymer, 47,227-33. 

Paulino, A.T., Fajardo, A.R., Junior, A.P., Muniz, E.C., Tambourgi, E.B., 2011. Two-step synthesis and properties of a magnetic-field-sensitive modified maltodextrin-based hydrogel. Polymer International 60, 1324—1333. 

NMR 13C spin-lattice relaxation times are sensitive to the reorientational dynamics of 13C-1H vectors. The motion of the attached proton(s) causes fluctuations in the magnetic field at the 13C nuclei, which results in decay of their magnetization. Although the time scale for the experimentally measured decay of the magnetization of a 13C nucleus in a polymer melt is typically on the order of seconds, the corresponding decay of the 13C-1H vector autocorrelation function is on the order of nanoseconds, and, hence, is amenable to simulation. 

On a side note, Ouskova and co-workers also reported that the composite of magnetic /i-FejOs nanorods in 5CB showed lower threshold voltages than pure 5CB, and that the sensitivity of the nematic liquid crystal to external magnetic fields was increased in the presence of such magnetic nanorods [451]. Finally, several groups interested in the macroscopic organization and orientation of nanorods also reported on the formation of a lyotropic liquid crystal phase induced by the self-assembly of polymer-coated semiconductor nanorods [453—457], which might be used to improve the device performance, for example, of solar cells. 

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