The surface tension/interfacial energy is found to be influenced by a strong magnetic field. This phenomenon is associated with an increase in the anomalous morphology of the eutectic during solidification of a hypereutectic Al–Cu alloy in strong magnetic fields. On the basis of further in situ differential thermal analyses, this increase is related to additional undercooling provoked by the magnetic field. A semiquantitative model is developed to reveal the underlying mechanisms. It is proposed that the heterogeneous nucleation is hindered through an increase in contact angle between the liquid and the crucible as a result of an additional surface tension, which is induced by the interfacial magnetic pressure. By revealing this effect, the present model can also clarify the contradictory phenomenon for liquid bismuth in literature.

No abstract

This paper reports the comparison of determination methods for extra virgin olive oil (EVOO) adulteration with two kinds of oils, refined olive oil (ROO) and soybean oil by 19FNMR, 1H NMR and chemical titration. The determination of adulteration of EVOO with ROO by 19F NMR was comparable to the conventional method. The contents of oleic, linoleic and linolenic acids of different oil samples can be determined by both 1H NMR and GC-MS. The results obtained from the two methods showed little differences. The adulteration of EVOO with soybean oil is detected by 1H NMR, although the limit of detection of the adulteration level is not less than 4.5%. The research demonstrates that 19F NMR can be a fast and convenient method to detect EVOO if it is adulterated with ROO and 1H NMR can be a fast and convenient method to detect EVOO if it is adulterated with seed oils.

No abstract

No abstract