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- W2023374681 abstract "Silica gels doped with polyamine copper(II) complexes were prepared by hydrolysis of tetraethyl orthosilicate solution containing the complexes (sol-gel technique) and by ion-exchange of the cations of those complexes for silanol protons on the silica surface (ion-exchange technique). The copper species trapped within silica gels by the ion-exchange technique were attached to two neighbouring silanol oxygens, well-dispersed in gel bodies and little eluted with water, whereas silica gels prepared by the sol-gel technique contained the copper(II) complexes as aggregates and most of the complexes were leached with water. The copper(II) complexes on silica gels thermally decomposed to copper(II) oxide and copper metal particles under atmospheres of air and nitrogen, respectively. The formation temperatures of these particles in the ion-exchange silica glasses were 200 ∼ 300 °C higher than those in the sol-gel glasses. The particle sizes of the oxide and metal of copper in the ion-exchange silica glasses were about 200 Å and considerably smaller than those in the sol-gel glasses." @default.
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- W2023374681 date "1989-12-01" @default.
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- W2023374681 title "Comparative studies on the silica gels doped with polyamine copper(II) complexes by ion-exchange and sol-gel techniques" @default.
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