Phase transition temperatures dendrimer

By this approach, it was therefore possible to retain the intrinsic emission properties of PAMAM and PPI dendrimers and manufacturing liquid crystals luminescent in the visible region, without introducing conventional fluorophores [112], Incorporation of rigid fluorophores in a mesophase quite often alters the phase transition temperatures of liquid-crystal materials to higher values, so these results are interesting because they provide the possibility of preparing luminescent liquid crystals close to room temperature. 

A mixed [60]fullerene-ferrocene dendrimer (Fig. 65) was also found to be mesomorphic, showing a room temperature smectic A phase which cleared at 157 °C (no glass transition temperature was detected) [294,295]. The mesophase was only slightly destabilized upon the addition of Ceo when com-... 

Kim and co-workers used peptide dendrons to form gel-phase assembled materials at relatively high concentrations (8 wt/vol %) [54], They employed both dendrons and symmetric dendrimers constituted from repeating amide units with peripheral hydrophobic chains (Fig. 15). They observed a negative dendritic effect on the thermal stability of the gel as determined from the gel-sol transition temperature (Tgei) measurements. 

There are two kinds of fix point solutions of the RR that describe the bulk behavior [15]. In the 1-cycle solution, the fix point solution becomes independent of the index m as we move toward the origin m = 0 on an infinite cactus, and is represented by x. For the current problem, it is given by x = 1 /2, as can be checked explicitly by the above RR in (10.48). It is obvious that it exists at all temperatures. There is no singularity in this fix point solution at any temperature. This solution corresponds to the disordered paramagnetic phase at high temperatures and the SMS below the melting transition to be discussed below. The other fix point solution is a 2-cycle solution, which has been found and discussed earlier in the semiflexible polymer problem [36, 37, 44, 46-48], the dimer model ]37], and the star and dendrimer solutions [48]. The fix point solution alternates between two values xj and x on two successive levels. At T = 0, this solution is given either by xj = 1 and x = 0, or by Xj = 0 and xj = 1. The system picks one of these as the solution. At and near T = 0, this solution corresponds to the low-temperature AF ordered phase, which represents the CR and its excitation at equal occupation, and can be obtained numerically. The... 

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