The complexation between poly(amidoamine) (PAMAM) dendrimers and silver ion was studied in this paper. The results showed that generations and surface groups of dendrimers, reaction time, pH value, mole ratio of Ag+ /...The complexation between poly(amidoamine) (PAMAM) dendrimers and silver ion was studied in this paper. The results showed that generations and surface groups of dendrimers, reaction time, pH value, mole ratio of Ag+ /PAMAM dendrimers, as well as reaction temperature strongly influence complexation between Ag+ and PAMAM dendrimers. The maximum complexing number of Ag+ that amino , hydroxyl and carboxylate terminated PAMAM dendrimers could bind has been obtained. It has been found that the measured value of amino and hydroxyl terminated PAMAM is almost similar to the theory value, but to carboxylate terminated PAMAM, there is a discrepancy between the measured value and theory value because of the electrostatic interaction between the silver ion and carboxyl group.展开更多
The influences of the concentration and generation of polyamidoamine dendrimer, the ratio of dodecanoic acid to toluene, and pH in the water phase on the extraction yield of helianthine were systematically studied by ...The influences of the concentration and generation of polyamidoamine dendrimer, the ratio of dodecanoic acid to toluene, and pH in the water phase on the extraction yield of helianthine were systematically studied by selecting helianthine as the guest molecule and electrostatic self-assembled PAMAM as the host. The experimental results show that the extraction yield of helianthine increased with the increase of the generation and concentration of the polyamidoamine dendrimer. When the mass ratio of dodecanoic acid to toluene was 1∶10, pH value was 7.3, the extraction yield of helianthine was the maximum. When the concentrations of 1.0, 2.0 and 3.0 generations of polyamidoamine dendrimer were all 0.21 mmol/L, their self-assembled dendrimers of 1.0, 2.0 and 3.0 generations of polyamidoamine dendrimer with dodecanoic acid exhibited the corresponding maximal extraction yields of helianthine, i.e., 6.04%, 41.61% and 68.50%, respectively. The action mechanism of the host-guest molecule in the phase transfer system is analyzed.展开更多
文摘The complexation between poly(amidoamine) (PAMAM) dendrimers and silver ion was studied in this paper. The results showed that generations and surface groups of dendrimers, reaction time, pH value, mole ratio of Ag+ /PAMAM dendrimers, as well as reaction temperature strongly influence complexation between Ag+ and PAMAM dendrimers. The maximum complexing number of Ag+ that amino , hydroxyl and carboxylate terminated PAMAM dendrimers could bind has been obtained. It has been found that the measured value of amino and hydroxyl terminated PAMAM is almost similar to the theory value, but to carboxylate terminated PAMAM, there is a discrepancy between the measured value and theory value because of the electrostatic interaction between the silver ion and carboxyl group.
文摘The influences of the concentration and generation of polyamidoamine dendrimer, the ratio of dodecanoic acid to toluene, and pH in the water phase on the extraction yield of helianthine were systematically studied by selecting helianthine as the guest molecule and electrostatic self-assembled PAMAM as the host. The experimental results show that the extraction yield of helianthine increased with the increase of the generation and concentration of the polyamidoamine dendrimer. When the mass ratio of dodecanoic acid to toluene was 1∶10, pH value was 7.3, the extraction yield of helianthine was the maximum. When the concentrations of 1.0, 2.0 and 3.0 generations of polyamidoamine dendrimer were all 0.21 mmol/L, their self-assembled dendrimers of 1.0, 2.0 and 3.0 generations of polyamidoamine dendrimer with dodecanoic acid exhibited the corresponding maximal extraction yields of helianthine, i.e., 6.04%, 41.61% and 68.50%, respectively. The action mechanism of the host-guest molecule in the phase transfer system is analyzed.
