Determination of the stability constants of uranyl/polymer complexes by differential pulse polarography

Complexation of uranyl ions by polypyrrole doped by sulfonated and phosphonated polyethyleneimine

“…The experimental P/U ratio of 2 in PPy/PEIPOH indicates the quasi-saturation of the phosphonic acid functions. As reported elsewhere, 14 the uranyl complexation in PEIPOH proceeds mainly through the phosphonates ligands.…”

“…The same conclusion was drawn elsewhere. 14 PEIPOH complexes uranium more extensively, which emphasizes the role of the phosphonic acid groups. 14 The P/U molar ratio was found equal to 2 for the PEIPOH/UO 2 2ϩ complex, compared to 6…”

“…The higher hydrophobicity of the PEI-based polyanions tested in this study is thought to be at the origin of the lower uranium content. Because the uranyl is not complexed by sulfonates, 14 it may be suggested that the amines in PPy/PEIPrSO 3 H are less effective ligands for uranyl than the amide functions in PPy/PAMPS composites.…”

“…Results are listed in Table V. For the sake of comparison, soluble preformed PEI-POH/UO 2 2ϩ complexes were precipitated by addition of polystyrenesulfonate (SSO 3 /CH 2 CH 2 N ϭ 5) as discussed elsewhere, 1,14 and the stability of the insoluble PEIPOH/UO 2 2ϩ /PSSO 3 complexes was also tested by the same method. It appears that the PPy/PEIPOH/ UO 2 2ϩ complexes are more resistant to dynamic and static leaching than the PPy/PEIPrSO 3 H/UO 2 2ϩ complexes, in agreement with the theoretical stability scale (K, stability constant) established for the water-soluble PEIPOH/UO 2 2ϩ and PEIPrSO 3 H/UO 2 2ϩ complexes.…”

Curcumin encapsulated pH sensitive gelatin based interpenetrating polymeric network nanogels for anti cancer drug delivery

“…GL networks have been prepared using physical (drying, heating, and electron beam) and chemical (formaldehyde, glutaraldehyde and genipin) crosslinking methods (Hellio and Djabourov, 2006). Poly(acrylamidoglycolic acid) (PAGA) is a class of acrylamide polymer that is used extensively in biomedical and separation fields due to the presence of hydrophilic chelating groups (Nagaraj et al, 1987;Leroy et al, 2001;Rivas et al, 2006). A previous study also reported PAGA based biomaterials used for biomedical applications (Krishna Rao et al, 2008bKrishna Rao and Ha, 2009).…”