Oligomer size

Small angle X-ray analysis Oligomer size and shape. 

Azobenzene has also been added to the internal surface of mesoporous films and powders through postsynthesis grafting.58,60-62 The effect of oligomer size on azobenzene isomerization kinetics was studied for branched oligomer-modified azobenzene derivatives in solution and covalently grafted to nanoporous silica 61 the size of the dendrimer had little effect on the thermal cis to trans isomerization rate in solution... 

Polythiophene randomly grafted with alkyl and aniline tetramer groups (157) was synthesized. The tetramer was chosen because it is the minimum oligomer size that mimics the electrochemical behavior of polyaniline, which shows semiconduction and conduction behavior depending on its state of oxidation and the pH. Transition from one structure to the other is illustrated in equation 23, where the electron mobility of quinonoid states (158) rearranging to isolated free radicals (159) is precluded after reduction to 160. A correlation was found between the electrochemical behavior and the UVV-NIR spectra of the 157 polymers255. 

Phase separation in the mixture was the result of a decrease in the entropic contribution due to the increase in the oligomer size, and a decrease in the en-thalpic contribution as a result of the decrease in the cohesive energy density of the CE-oligomer in the course of polymerization. 

Species Protein (Acc number) Amino acids Subunits per oligomer (size) Method0 References... 

Oligomer Size as a Plausible Determinant of Single-Channel Conductance... 

Lipase-Catalyzed Degradation into Cyclic Oligomers having the Desired Oligomer Size... 

The mass separation of the major cluster of peaks was foimd to be 108.25 Da as expected from the synthesis. The mass separation of 18 Da between peaks within a major cluster indicated the loss of H2O and tire formation of intramolecular closed loops. The data indicated also that the percentage of closed loops did not vary with oligomer size, and that the molecular structure was intermediate between branched-linear and a simple ladder structure, with no evidence that fully condensed structures had been formed in significant amounts. ... 

FIGURE 6.61 Oligomer size distribution with respect to (a) light scattering, (b) particle number, and (c) particle volume for a mixture of ossein (1 wt%) and PVA (1 wt%) solutions (salinity 0.9 wt% NaCl) as a function of observation time from 3 min to 48 h. (Adapted from J. Colloid Interface Sci., 300, Gun ko, V.M., Zarko, V.I., Voronin, E.F. et ah. Successive interaction of pairs of soluble organics with nanosilica in aqueous media, 20-32, 2006f, Copyright 2006, with permission from Elsevier.)... 

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