TY - JOUR
T1 - SANS contrast in iota-carrageenan gels and solutions in D2O
AU - Mischenko, N.
AU - Denef, B.
AU - Mortensen, K.
AU - Reynaers, H.
PY - 1997
Y1 - 1997
N2 - SANS of Na+-iota-carrageenan in D2O/saline solutions was measured as a function of concentration, temperature and type of counterions (K+ or Na+). High and low scattering-contrasted gels and solutions were detected. High contrast is caused by aggregation of low-hydrated chains at high concentration of carrageenan in the presence of gel-promoting counterions. The aggregates do not disappear at 60 degrees C, although at this temperature the molecules should partially lose their ordered conformation. The network formation, observed by SANS, does not happen in high-contrast system immediately after cooling and takes a few hours to be completed at 12 degrees C. The minimum concentration sufficient for the high-contrast regime in 0.1 M KCl lies between 15 and 25 mg/ml.
AB - SANS of Na+-iota-carrageenan in D2O/saline solutions was measured as a function of concentration, temperature and type of counterions (K+ or Na+). High and low scattering-contrasted gels and solutions were detected. High contrast is caused by aggregation of low-hydrated chains at high concentration of carrageenan in the presence of gel-promoting counterions. The aggregates do not disappear at 60 degrees C, although at this temperature the molecules should partially lose their ordered conformation. The network formation, observed by SANS, does not happen in high-contrast system immediately after cooling and takes a few hours to be completed at 12 degrees C. The minimum concentration sufficient for the high-contrast regime in 0.1 M KCl lies between 15 and 25 mg/ml.
KW - Nye funktionelle materialer
U2 - 10.1016/S0921-4526(96)00958-1
DO - 10.1016/S0921-4526(96)00958-1
M3 - Journal article
SN - 0921-4526
VL - 234/236
SP - 283
EP - 285
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
ER -