Hyperbranch-polyethyleniminated functional polymers II: effect of polyethyleniminated polyoxypropylenediamines on copper nanoparticle formation in aqueous solution |
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Authors: | Ping-Lin Kuo Wuu-Jyh Liang Fu-Yu Wang |
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Affiliation: | (1) Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan, 70101, Republic of China;(2) Fire Protection and Safety Research Center, National Cheng Kung University, Tainan, Taiwan, 70101, Republic of China |
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Abstract: | Colloidal aqueous solution of zerovalent copper (Cu(0)) nanoparticles were prepared from the Cu2+ ions coordinated with polyethyleniminated polyoxypropylenediamines (D400(EI) x ) followed by chemical reduction of NaBH4. Aqueous solution of copper clusters formed in the presence of D400(EI)8 with a loading ratio of [EI]/[Cu2+] = 3 were stable without precipitation for standing more than 1 month. The protective effects of D400(EI) x and the particle size of the resulted Cu nanoparticle are regulated by the attachments of ethylenimine (EI) groups per polymer backbone and the normality ratio of [EI]/[Cu2+] used. It is found that the more EI-content per polymer backbone results in the smaller particle size and the narrower size dispersity of the colloidal Cu(0) particles, and the average particle size of 5.07 nm with standard deviation of 0.86 nm was obtained in the presence of D400(EI)8 with the ratio of [EI]/[Cu2+] = 3. As the polymer concentration of D400(EI)8 increases (the increase of [EI]/[Cu2+]), the average particle size of the prepared Cu(0) nanoparticle slightly changes, but interestingly, the size dispersity gradually decreases, where the standard deviation for the concentration at [EI]/[Cu2+] = 5 is 0.82 nm approaching that for monodispersed nanoparticles (0.5 nm). |
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Keywords: | Ethylenimine Nanoparticles Polymer-metal complexes Water-soluble polymers |
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