Influence of transitional metal ions on lyotropic liquid crystals of hydroxyethyl cellulose acetate in N,N-dimethylformamide
✍ Scribed by Qizhou Dai; Yong Huang; Jiarui Shen
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 357 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1042-7147
No coin nor oath required. For personal study only.
✦ Synopsis
The influence of inorganic salts on the formation of lyotropic liquid crystals of hydroxyethyl cellulose acetate (HECA) in N,N-dimethylformamide (DMF) was studied. In the presence of CaC12, an inorganic salt of a principal group metal, the solution of HECAIDMFICaCl, was a biphasic system. The temperature of the transformation from the liquid crystalline phase to the isotropic one increased with adding CaCl, because local HECA concentration increases in the HECAIDMF phase. When CuCl, or CoCl,, inorganic salts of transitional metals, was added, the solutions were monophasic systems and the complexes of HECA with Cu2+ or Co2+ were formed in solutions, which results in the increase of the temperature of the transfomation from the liquid crystalline phase to the isotropic one.