0000000000115140
AUTHOR
Me
About entangled networks of worm-like micelles: a rejected hypothesis
We report new results from small-angle neutron scattering on d(1 2)-cyclohexane/lecithin/water micellar solutions performed as a function of the water content (w(o)), temperature (T) and dispersed phase volume fraction (phi). The data from dilute samples are interpretable in terms of the existence of giant cylindrical reverse micelles and are well fit with a core-shell model (that provides the micelle structure and dimensions) with values of 28 and 45 Angstrom for the inner core and the outer shell radii, almost independent on temperature and concentration. Such a result could appear consistent with the current idea that worm-like micelles are living polymers. On the contrary, the appearanc…
Small-angle neutron scattering from lecithin reverse micelles
Abstract We report new results of small-angle neutron scattering from cyclohexane- d 12 /lecithin/water micellar solutions, performed as a function of the water content, w 0 , the temperature, T and the dispersed-phase volume fraction, ф. The data from dilute samples can be interpreted in terms of the existence of giant cylindrical reverse micelles, in good agreement with the current idea of an unlimited micellar growth with ф. In contrast, the appearance of a sharp interference maximum at high concentrations ( ф > 0.15 ) suggests that the current hypothesis of a gel structure interpreted as a random network of entangled micelles can be assumed to be incorrect, and that there must be some c…
La sinistra:italiana una commedia in tre atti.
L’entrata nella seconda Repubblica è stata scandita dalla marcia trionfale della sinistra in predicato di vincere le elezioni politiche. I risultati elettorali più gratificanti della sinistra sono stati la traballante vittoria del 1996 e le non vittorie (sostanziali pareggi) del 2006 e del 2013, al contrario erano certe nelle previsioni e nei fatti le vittorie berlusconiane del 2001 e del 2008.