Anisotropic counterion polarizations and their dynamics in aqueous polyelectrolytes as studied by frequency-domain electric birefringence relaxation spectroscopy

1989 ◽  
Vol 22 (3) ◽  
pp. 1359-1366 ◽  
Author(s):  
Norio Ookubo ◽  
Yoshinori Hirai ◽  
Kohzo Ito ◽  
Reinosuke Hayakawa
Keyword(s):  
Frequency Domain ◽  
Electric Birefringence ◽  
Birefringence Relaxation

scholarly journals Characterization of proteoglycan and the proteoglycan-hyaluronic acid complex by electric birefringence

1978 ◽  
Vol 173 (1) ◽  
pp. 237-243 ◽  
Author(s):  
M Isles ◽  
A R Foweraker ◽  
B R Jennings ◽  
T Hardingham ◽  
H Muir
Keyword(s):  
Hyaluronic Acid ◽  
Particle Orientation ◽  
Dilute Solution ◽  
Relaxation Rates ◽  
Acid Complex ◽  
Electric Birefringence ◽  
Partial Alignment ◽  
Uronic Acid Content ◽  
Birefringence Relaxation

An electric field causes partial alignment of macromolecules in a dilute solution. The accompanying changes in the solution birefringence offer a sensitive and quick means of monitoring the rates of particle orientation and hence the size of the solute molecules. Such measurements are reported for dilute solutions of proteoglycans in the absence and presence of added hyaluronic acid. The proteoglycan molecules are shown to be some 580 nm long. In the presence of hyaluronic acid they form aggregates that appear to be consistent with the model previously proposed in which the proteoglycans attach radially to the extended hyaluronic acid chain. The electric-birefringence relaxation rates indicate aggregates of similar length to that of the extended hyaluronic acid chain, with the proteoglycans spaced on average at 29nm intervals. A proteoglycan sample the cystine residues of which had been reduced and alkylated showed no evidence of aggregation with hyaluronic acid up to the concentrations of the acid corresponding to 1% of the total uronic acid content. The electric-birefringence method is shown to have a large potential in the study of associating polysaccharide solutions.

Intrachain conduction and main-chain conformation of conducting polymers as studied by frequency-domain electric birefringence spectroscopy

1994 ◽  
Vol 72 (13) ◽  
pp. 2073-2076 ◽  
Author(s):  
Takeshi Shimomura ◽  
Haruhiko Sato ◽  
Hiroshi Furusawa ◽  
Yasuyuki Kimura ◽  
Hajime Okumoto ◽  
...  
Keyword(s):  
Conducting Polymers ◽  
Frequency Domain ◽  
Main Chain ◽  
Chain Conformation ◽  
Electric Birefringence

Frequency-domain electric birefringence spectra of conducting polymers

1995 ◽  
Vol 69 (1-3) ◽  
pp. 689-690 ◽  
Author(s):  
T. Shimomura ◽  
Y. Kimura ◽  
K. Ito ◽  
R. Hayakawa ◽  
S. Hotta
Keyword(s):  
Conducting Polymers ◽  
Frequency Domain ◽  
Electric Birefringence
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