Braz. J. Phys. vol.31 número3

Knowledge of partile size distribution is very important for the study of magneti uids, magneti.. powders and other

hemial speies are present on the maghemite surfae by hanging the laser exitation energy.. Maghemites modied by the adsorption of asparti and glutami aids as well as those

Some fundamentals of M ossbauer spetrosopy and of utuating magneti hyperne interations..

Thermal diusivity results obtained with the ollinear mirage tehnique, are reported for dierent.. onentrations surfated ferrouid and for a set of aid ferrouids with variable

We onsider that one of the uids is a ferrouid and that an external magneti eld is applied.. The interfaial instabilities whih arise between the uids are studied for various

Ferrouid drops are freely suspended in air by using magneti elds to.. reate an attrative fore

The phase diagram of a magneti olloid in a Hele-Shaw ell is alulated.. As a funtion

the dispersion equation is then used to analyse the apillary-wave resistane, that is the drag fore.. assoiated to the emission of waves by a moving disturbane at a free